Coffee bean extract and preparation method thereof, aerosol-generating substrate and liquid heating device

Abstract

The invention relates to the technical field of aerosol generation, in particular to a coffee bean extract and a preparation method thereof, an aerosol generation matrix and a liquid heating device. The preparation method of the coffee bean extract provided by the invention comprises the following steps: crushing coffee beans to obtain coffee bean powder; performing supercritical extraction treatment on the coffee bean powder to obtain a supercritical extraction material; freezing and filtering the supercritical extraction material to obtain a separation product, and concentrating the separation product to obtain a supercritical extract; mixing the supercritical extract with an alcohol solvent, and performing ultrasonic treatment to obtain a mixed solution; standing the mixed solution, and extracting supernate; and carrying out solvent removal treatment on the supernate to obtain the coffee bean extract. The coffee bean extract prepared by the invention is good in quality, not only has a good user taste when being used in an aerosol generating matrix, but also enables a heating device not to easily generate carbon deposition and even core pasting phenomena, and has a good application prospect.

Description

Technical Field

[0001] This application belongs to the field of aerosol generation technology, and particularly relates to a coffee bean extract and its preparation method, an aerosol generation matrix, and a liquid heating device. Background Technology

[0002] The coffee tree is an evergreen shrub belonging to the Rubiaceae family and the Coffea genus. Its leaves are opposite, ovate-elliptic, acuminate at the apex, entire, and leathery. The inflorescence is a cyme, axillary, with white, fragrant corollas. The berry is spherical, turning from green to yellow to red when ripe, and is hemispherical. Coffee beans are the seeds inside the fruit of the coffee tree and are the raw material for making coffee. Coffee bean extract is a component extracted from coffee beans and can be used as an important raw material for aerosol generation matrices. Coffee-flavored aerosol generation matrices are mainly achieved by adding coffee extract to the aerosol generation matrix and are very popular with consumers.

[0003] Common extraction methods for coffee bean extracts include solvent extraction, steam distillation, distillation extraction, supercritical carbon dioxide extraction, molecular distillation, and microwave-assisted extraction. Among these, supercritical carbon dioxide extraction technology, with its core advantages of being environmentally friendly, efficient, and safe, is an ideal alternative to traditional organic solvent methods. However, coffee beans contain waxes. While these waxes can reduce UV damage to the plant and prevent the loss of free water, they can negatively impact the aerosol-forming matrix, leading to a decline in the flavor of the aerosol matrix and causing carbon buildup or even burnt wicks in the heating equipment. Because supercritical carbon dioxide extraction technology has extremely low selectivity for weakly polar components, the resulting coffee bean extract contains a high content of waxes, thus affecting the lifespan of the heating equipment and the user experience. Summary of the Invention

[0004] The purpose of this application is to provide a coffee bean extract and its preparation method, an aerosol generating matrix, and a liquid heating device, aiming to solve the technical problem of how to reduce the content of wax and other impurities in the coffee bean extract to better enable its application in the aerosol generating matrix. To achieve the above-mentioned objective, the technical solution adopted in this application is as follows: In a first aspect, this application provides a method for preparing a coffee bean extract, comprising: Coffee beans are crushed to obtain coffee bean powder; The coffee bean powder is subjected to supercritical extraction to obtain supercritical extract material; The separation product obtained after freeze-filtration of the supercritical extract is concentrated to obtain the supercritical extract. The supercritical extract was mixed with an alcohol solvent and then subjected to ultrasonic treatment to obtain a mixed solution. After allowing the mixed solution to stand, the supernatant is extracted. The supernatant was desolventized to obtain coffee bean extract.

[0005] The method for preparing coffee bean extract provided in this application firstly utilizes supercritical fluid extraction to efficiently extract aroma and flavor substances from coffee beans, thereby enhancing the olfactory and gustatory experience of the extract. Next, freeze filtration removes some impurities, and the extract is further concentrated for subsequent alcohol precipitation of waxes. Specifically, the concentrated supercritical extract is mixed with an alcohol solvent and subjected to ultrasonic treatment, followed by static extraction of the supernatant. This significantly reduces residual oily substances in the coffee bean extract. Finally, further solvent removal purifies the coffee bean extract, further improving its quality. The coffee bean extract prepared in this application, when used in aerosol generation matrices, not only offers excellent taste but also exhibits good solubility, reducing the likelihood of carbon buildup or scorching in heating devices, demonstrating promising application prospects.

[0006] In some possible implementations, the supercritical extraction process includes supercritical carbon dioxide extraction, and the conditions for the supercritical carbon dioxide extraction include one or more of the following: (1) The extraction pressure is 15 MPa to 30 MPa; (2) The extraction temperature is 35℃~45℃; (3) The extraction time is 1h to 3h; (4) Extraction is carried out under the condition of an entrainer, wherein the entrainer includes at least one of alcohol solvents, ester solvents, and ketone solvents, and / or the mass of the entrainer is 0.2 to 3 times the mass of the coffee bean powder.

[0007] By selecting appropriate conditions such as pressure, temperature, time, and entrainers in supercritical carbon dioxide extraction, it is possible to better extract useful substances such as aroma and flavor from coffee beans.

[0008] In some possible implementations, the alcohol solvent in the entrainer includes at least one of methanol, ethanol, propanol, and propylene glycol; And / or, the ester solvent in the entrainer includes at least one of ethyl formate and ethyl acetate; And / or, the ketone solvent in the entrainer includes at least one of acetone and butanone.

[0009] The aforementioned entrainer can be well combined with supercritical carbon dioxide fluid to maximize the dissolution of various components in coffee bean powder and improve extraction efficiency.

[0010] In some possible implementations, the freeze filtration includes: freezing and standing at a temperature of -80°C to -10°C for 12 to 24 hours, followed by filtration to remove impurities; And / or, the concentration process includes: vacuum concentration at a temperature of 40°C to 50°C.

[0011] The freezing process described above can significantly reduce the solubility of waxes and some high molecular weight impurities (such as proteins and polysaccharides), thereby enabling these impurities to precipitate and separate more effectively.

[0012] In some possible implementations, in the step of mixing the supercritical extract with the alcohol solvent, the mass ratio of the supercritical extract to the alcohol solvent is 1:(1-9). And / or, the alcohol solvent includes an ethanol solution; And / or, the mass fraction of the alcohol solvent is 90% to 99%.

[0013] The high concentration of alcohol solvents mentioned above can effectively remove the waxy components from the supercritical extract.

[0014] In some possible implementations, the conditions for the ultrasonic treatment include one or more of the following: (1) The duration of the ultrasonic treatment is 40 min to 80 min; (2) The temperature of the ultrasonic treatment is 25℃~60℃; (3) The ultrasonic frequency of the ultrasonic treatment is 30kHz to 50kHz.

[0015] By adding a high concentration of alcohol solvent to the supercritical coffee bean extract and then subjecting it to ultrasonic treatment under the aforementioned conditions to better remove waxy components, the residual oily substances in the coffee bean extract are reduced, significantly improving the quality of the coffee bean extract.

[0016] In some possible implementations, the settling process includes: setting the mixed solution at a temperature of -4°C to 4°C for 12 to 24 hours.

[0017] The above-mentioned low-temperature standing conditions can reduce the solubility of wax and some impurities in alcohol solvents, thereby precipitating them out and settling them at the bottom, so as to better purify the coffee bean extract and improve its quality.

[0018] In some possible implementations, the extraction of supernatant includes: centrifuging the mixed solution after static treatment at a speed of 6000 r / min to 8000 r / min for 30 min to 60 min, and then collecting the supernatant.

[0019] The centrifugation process described above can better separate insoluble substances from the supernatant in the mixed solution, thereby significantly improving the purity of the supernatant.

[0020] In some possible implementations, desolventizing the supernatant includes evaporating and concentrating the supernatant at a heating temperature of 40°C to 50°C.

[0021] The above-mentioned solvent removal process can effectively remove excess alcohol solvent, which not only improves the user's taste when used in aerosol generation matrix, but also reduces the risk of natural disasters in heating devices, thus improving the reliability of the equipment.

[0022] In some possible implementations, the coffee bean crushing process includes grinding the coffee beans into coffee bean powder with a particle size of 20 to 200 mesh; And / or, before crushing the coffee beans, the coffee beans are roasted at a temperature of 190℃~255℃ for 5min~45min.

[0023] Grinding coffee beans to the aforementioned size increases the contact area between the material and supercritical carbon dioxide, facilitating the dissolution of active substances from the coffee bean powder into the supercritical carbon dioxide, thereby improving extraction efficiency and shortening extraction time. The roasting process promotes the decomposition of starch within the coffee beans, further combining with amino acids to form caramelization products, thus imparting sweetness and body to the coffee. Furthermore, chlorogenic acid (a bitter component) in the coffee beans can be converted into soluble acids such as quinic acid, reducing astringency. Simultaneously, the formation of various organic acids increases the complexity of the acidity and aroma, enhancing aroma complexity and balancing acidity and bitterness. Additionally, the roasting process causes the coffee beans to absorb heat and expand, increasing their volume, loosening their internal structure, and further reducing moisture, which is more conducive to subsequent grinding and extraction.

[0024] Secondly, this application provides a coffee bean extract, which is prepared by the preparation method provided in the first aspect of this application.

[0025] The coffee bean extract provided in this application is prepared by a unique preparation method of this application and has excellent quality. When this coffee bean extract is used in the aerosol generation matrix, it not only has a good taste but also dissolves well, making the heating device less prone to carbon buildup or even burnt core, thereby improving the service life of the heating device and the user experience.

[0026] Thirdly, this application provides an aerosol generating matrix containing the coffee bean extract provided in the second aspect of this application.

[0027] The aerosol generating matrix provided in this application contains a coffee bean extract unique to this application. It not only has a good taste but also dissolves well, making it less likely for heating devices used to heat the aerosol generating matrix to produce carbon buildup or even burnt core, thereby improving the service life of the heating device and the user experience.

[0028] In some possible implementations, the aerosol generating matrix includes the coffee bean extract and a polyol solvent.

[0029] A liquid aerosol generating matrix, prepared by using a polyol solvent and the aforementioned coffee bean extract, can be well used in liquid heating devices.

[0030] In some possible implementations, the coffee bean extract comprises 2% to 5% by mass in the aerosol-generating matrix; And / or, the polyol solvent includes at least one of glycerol, ethylene glycol, propylene glycol, butanediol, and diethylene glycol.

[0031] The proportions of coffee bean extracts and the types of polyol solvents mentioned above can effectively adjust the taste of the aerosol-generating matrix and improve the user experience.

[0032] Fourthly, this application provides a liquid heating device, including a heating core and an aerosol generating matrix provided in the third aspect of this application, which is inserted into the heating core.

[0033] The heating element of the liquid heating device provided in this application contains the aerosol generating matrix provided in this application. The coffee bean extract is used in the aerosol generating matrix. Based on the fact that the aerosol generating matrix not only has a good taste but also has a good solubility, the liquid heating device of this application is not prone to carbon buildup or even core burning, thereby improving the service life of the liquid heating device and the user experience.

[0034] In some possible implementations, the heating element includes a ceramic heating element.

[0035] The ceramic heating element has high thermal efficiency and long lifespan. In addition, the aerosol generation matrix of this application has little impact on it, thereby further improving the service life of the liquid heating device.

[0036] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the preparation method of coffee bean extract provided in this application.

[0039] Figure 2 This is a photograph of the appearance of a ceramic heating core tested using coffee bean extract prepared in Example 1 of this application in an aerosol generation matrix.

[0040] Figure 3 This is a photograph of the appearance of a ceramic heating core tested using coffee bean extract prepared in Example 2 of this application in an aerosol generation matrix.

[0041] Figure 4 This is a photograph of the appearance of a ceramic heating core tested using coffee bean extract prepared in Example 3 of this application in an aerosol generation matrix.

[0042] Figure 5 This is a photograph of the appearance of a ceramic heating core tested using coffee bean extract prepared in Example 4 of this application in an aerosol generation matrix.

[0043] Figure 6 This is a photograph of the appearance of a ceramic heating core tested using coffee bean extract prepared in Example 5 of this application in an aerosol generation matrix.

[0044] Figure 7 This is a photograph of the appearance of a ceramic heating core tested using coffee bean extract prepared in Example 6 of this application in an aerosol generation matrix.

[0045] Figure 8 This is a photograph of the appearance of a ceramic heating core tested using coffee bean extract prepared in Example 7 of this application in an aerosol generation matrix.

[0046] Figure 9 This is a photograph of the appearance of the ceramic heating core tested using coffee bean extract prepared in Comparative Example 1 of this application in an aerosol generation matrix.

[0047] Figure 10 This is a photograph of the appearance of the ceramic heating core tested using coffee bean extract prepared in Comparative Example 2 of this application in an aerosol generation matrix.

[0048] Figure 11 This is a photograph of the appearance of the ceramic heating core tested using coffee bean extract prepared in Comparative Example 3 of this application in an aerosol generation matrix. Detailed Implementation

[0049] To make the technical problems, technical solutions, and beneficial effects of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0050] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0051] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, "at least one of a, b or c", or "at least one of a, b and c", can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple.

[0052] It should be understood that in the various embodiments of this application, the order of the above processes does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0053] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0054] The weights of the relevant components mentioned in the embodiments of this application can refer not only to the specific content of each component, but also to the proportional relationship between the weights of the components. Therefore, any scaling up or down of the content of the relevant components according to the embodiments of this application is within the scope disclosed in the embodiments of this application. Specifically, the mass described in the embodiments of this application can be a well-known unit of mass in the chemical industry, such as µg, mg, g, or kg.

[0055] The terms "first" and "second" are used for descriptive purposes only, to distinguish objects, such as substances, from one another, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. For example, without departing from the scope of the embodiments of this application, "first XX" may also be referred to as "second XX," and similarly, "second XX" may also be referred to as "first XX." Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0056] The term "aerosol" broadly refers to all colloids that can be suspended in the air. The particle size of aerosols is generally about 10 nm to 10 μm, but can be, for example, 10 nm to 1000 nm. This application mainly refers to suspended particles / mixtures of suspended particles generated during operation by heating, which are formed by heating an aerosol generation matrix. The "mist" inhaled by the user is this type of aerosol.

[0057] The term "aerosol generating matrix" refers to a raw material that can generate aerosols upon heating. It is a basic component used in heating devices, whether in liquid, solid, or paste form. Aerosol generating matrix components can consist of various flavoring agents and flavoring substances. Heating and vaporizing the aerosol generating matrix can form aerosols for users to inhale.

[0058] The term "heating device" refers to a device that can heat the object to be heated, i.e., the aerosol-generating matrix, to form an aerosol, such as a liquid heating device or an electronic heating device. Heating devices typically use built-in heating elements (such as heating cores) to precisely heat a specially formulated aerosol-generating matrix to a specific temperature, causing some substances in the matrix to evaporate and generate an aerosol for user use.

[0059] The term "mesh count" refers to the number of openings per square inch on a sieve. It also indicates the particle size that can pass through the sieve; the higher the mesh count, the smaller the particle size. For example, 10 mesh means there are 10 openings per square inch, corresponding to a sieve aperture size of 2.00 mm; 20 mesh means there are 20 openings per square inch, corresponding to a sieve aperture size of 0.850 mm; 30 mesh means there are 30 openings per square inch, corresponding to a sieve aperture size of 0.600 mm, and so on.

[0060] The term "supercritical extraction" refers to an extraction technique that uses supercritical fluids as extractants. Supercritical fluids are substances that exist in a state between gas and liquid, neither gaseous nor liquid. Such substances can only exist when their temperature and pressure exceed a critical point, such as supercritical carbon dioxide fluid. Supercritical carbon dioxide extraction utilizes the high diffusivity and solubility of carbon dioxide in its supercritical state to separate natural products.

[0061] Coffee bean extracts obtained using existing supercritical fluid extraction technology are not ideal. When used in aerogel generation matrices, they can easily cause severe carbon buildup or even wicking issues in heating devices, thus affecting equipment lifespan and user experience. Therefore, this application develops a coffee bean extract and its preparation method. The extract is obtained from coffee beans using supercritical fluid extraction technology, and subsequent refining processes remove as much wax and other impurities as possible. This improves upon the drawback of coffee bean extracts affecting the lifespan of heating devices and user experience when used in aerosol generation matrices. The specific technical solution is as follows.

[0062] Firstly, embodiments of this application provide a method for preparing a coffee bean extract. For example... Figure 1 As shown in the embodiments of this application, the method for preparing coffee bean extract includes the following steps: S01: Crush coffee beans to obtain coffee bean powder; S02: Supercritical extraction is performed on coffee bean powder to obtain supercritical extract material; S03: The separation product obtained after freeze filtration of supercritical extract is concentrated to obtain supercritical extract. S04: A mixed solution is obtained by mixing supercritical extract with alcohol solvent and then ultrasonically treating the mixture. S05: After allowing the mixed solution to stand, extract the supernatant; S06: The supernatant is desolventized to obtain coffee bean extract.

[0063] The method for preparing coffee bean extract provided in this application firstly utilizes supercritical fluid extraction to efficiently extract aroma and flavor substances from coffee beans, thereby enhancing the olfactory and gustatory qualities of the extract. Next, freeze filtration removes some impurities, and the extract is further concentrated for subsequent alcohol precipitation of waxes. Specifically, the concentrated supercritical extract is mixed with an alcohol solvent and subjected to ultrasonic treatment, followed by static extraction of the supernatant. This significantly reduces residual oily substances in the coffee bean extract. Finally, further solvent removal purifies the coffee bean extract, further improving its quality. The coffee bean extract prepared in this application, when used in aerosol generation matrices, not only offers excellent taste but also exhibits good solubility, making it less prone to carbon buildup or scorching in heating devices, thus demonstrating promising application prospects.

[0064] Step S01 is the coffee bean pretreatment step, which forms coffee bean powder to be extracted.

[0065] Specifically, in some possible implementations, the coffee beans are dried to remove moisture before being crushed, then roasted, cooled, and finally crushed. Furthermore, by adjusting the roasting temperature and time, the flavor profile can be modified to meet the needs of different consumers.

[0066] In some possible implementations, the coffee beans are roasted at a temperature of 190°C to 255°C for 5 to 45 minutes before being crushed. For example, the roasting temperature can be any of the above values ​​or within any combination of 190°C, 195°C, 200°C, 210°C, 220°C, 230°C, 240°C, 250°C, 255°C, etc.; the roasting time can be any of the above values ​​or within any combination of 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes, 30 minutes, 35 minutes, 40 minutes, 45 minutes, etc.

[0067] The roasting process described above promotes the breakdown of starch in coffee beans, which then combines with amino acids to form caramelization products, thus imparting sweetness and body to the coffee. Simultaneously, during this roasting process, chlorogenic acid (a bitter component) in the coffee beans can be converted into soluble acids such as quinic acid, reducing astringency. Furthermore, the formation of various organic acids increases the complexity of the acidity and aroma, thereby enhancing aroma complexity and balancing acidity and bitterness. It should also be noted that this roasting process causes the coffee beans to expand due to heat absorption, increasing their volume. This results in a more porous internal structure, further reducing moisture content and making subsequent grinding and extraction more efficient.

[0068] Specifically, in some possible implementations, the coffee bean crushing process includes grinding the coffee beans into coffee bean powder with a particle size of 20 to 200 mesh. Specifically, roasted and cooled coffee beans can be ground into coffee bean powder of the above particle size and then sieved for later use. Exemplarily, the particle size of the coffee bean powder can be set to any one or a range between any two values, such as 20 mesh, 30 mesh, 40 mesh, 50 mesh, 60 mesh, 80 mesh, 100 mesh, 140 mesh, 160 mesh, 180 mesh, and 200 mesh.

[0069] Grinding coffee beans into powder increases the contact area between the material and supercritical carbon dioxide, facilitating the dissolution of active substances from the coffee powder into the supercritical carbon dioxide, thus improving extraction efficiency and shortening extraction time. Naturally, a higher mesh size (smaller coffee bean powder) results in better extraction.

[0070] Step S02 is a supercritical extraction process, in which coffee bean powder is subjected to supercritical extraction to obtain supercritical extract containing effective components.

[0071] In some possible implementations, supercritical extraction processes include supercritical carbon dioxide extraction, in which entrainers are used. Entrainers are a class of organic compounds used to alter the solubility and selectivity of solutes in supercritical fluids. They are suitable for scenarios such as supercritical carbon dioxide extraction and azeotropic distillation, and regulate the solute dissolution behavior through intermolecular forces (such as hydrogen bonds).

[0072] For example, in this embodiment, an entrainer is added to a supercritical entrainer tank, and the prepared coffee bean powder is added to the supercritical entrainer for supercritical carbon dioxide extraction to obtain the extract. The entrainer can enhance solubility, selectivity, and phase behavior regulation, enabling supercritical carbon dioxide extraction technology to process highly polar and high molecular weight components (such as alkaloids and polysaccharides), thereby expanding the applicability of supercritical carbon dioxide extraction technology and allowing this embodiment to more fully extract the effective components of coffee bean powder.

[0073] In some possible implementations, the entrainer includes at least one of alcohol solvents, ester solvents, and ketone solvents. For example, alcohol solvents include at least one of methanol, ethanol, propanol (such as n-propanol or isopropanol), and propylene glycol; ester solvents include at least one of ethyl formate and ethyl acetate; and ketone solvents include at least one of acetone and butanone. In this embodiment, ethanol can be used as the entrainer. Providing an entrainer selection allows for good compatibility with supercritical carbon dioxide fluid, maximizing the dissolution of various components in coffee bean powder and improving extraction efficiency.

[0074] For example, ethanol can be used as an entrainer. Ethanol has moderate polarity and can form hydrogen bonds with supercritical carbon dioxide, which can enhance the extraction efficiency of polar components (such as alkaloids) in coffee beans. Moreover, ethanol has high safety and meets food-grade standards.

[0075] In some possible implementations, the mass of the entrainer is 0.2 to 3 times the mass of the coffee bean powder, that is, the mass of the entrainer is 20% to 300% of the mass of the coffee bean powder. For example, the mass of the entrainer can be any one or any two values ​​within a range of 20%, 30%, 40%, 50%, 60%, 70%, 80%, 100%, 120%, 140%, 150%, 180%, 200%, 220%, 240%, 250%, 260%, 280%, 300% of the mass of the coffee bean powder. Adding an entrainer at this proportion results in better extraction of the coffee bean powder.

[0076] In some possible implementations, the extraction pressure of supercritical carbon dioxide extraction is 15 MPa to 30 MPa; for example, the extraction pressure can be any one or any two values ​​of 15 MPa, 18 MPa, 20 MPa, 25 MPa, 28 MPa, 30 MPa, etc.

[0077] In some possible implementations, the extraction temperature of supercritical carbon dioxide extraction is 35°C to 45°C; for example, the extraction temperature can be any one or any two values ​​of 35°C, 36°C, 37°C, 38°C, 39°C, 40°C, 41°C, 42°C, 43°C, 44°C, 45°C, etc.

[0078] In some possible implementations, the extraction time for supercritical carbon dioxide extraction can be 1 h to 3 h; for example, the extraction time can be any one or any two values ​​of 1 h, 1.5 h, 2 h, 2.5 h, 3 h, etc.

[0079] In some possible implementations, supercritical carbon dioxide extraction uses an extraction pressure of 15 MPa to 30 MPa, an extraction temperature of 35°C to 45°C, and an extraction time of 1 to 3 hours. By selecting the pressure, temperature, and time in supercritical carbon dioxide extraction, it is possible to better extract useful substances such as aroma and flavor from coffee beans.

[0080] Step S03 is a low-temperature impurity removal step for supercritical extract, in which impurities are removed by freezing the supercritical extract at low temperature to obtain a supercritical extract with higher purity.

[0081] In some possible implementations, cryofiltration includes freezing the supercritical extract at a temperature of -80°C to -10°C for 12 to 24 hours, followed by filtration to remove impurities. Exemplarily, the cryo-freezing temperature can be set to any one or a range between any two values, such as -80°C, -70°C, -60°C, -50°C, -40°C, -30°C, -20°C, and -10°C; the cryo-freezing time can be set to any one or a range between any two values, such as 12 hours, 14 hours, 16 hours, 18 hours, 20 hours, 22 hours, and 24 hours.

[0082] The aforementioned low-temperature freezing treatment reduces the solubility of some impurities (such as proteins, polysaccharides, and other macromolecules) in the supercritical fluid extract in the solvent, thus facilitating their precipitation. The extended freezing and settling time also allows for more thorough precipitation and sedimentation of these impurities, simplifying the filtration process. Therefore, by subjecting the supercritical fluid extract to this low-temperature freezing treatment and then filtering to remove impurities, the separated product is further concentrated under reduced pressure to obtain a high-purity supercritical coffee bean extract.

[0083] In some possible implementations, the concentration process includes: concentrating the separated product obtained after freeze-filtration of the supercritical fluid extract under reduced pressure at a temperature of 40°C to 50°C. Exemplarily, the temperature for reduced pressure concentration can be set to any one or a range between any two of the following values: 40°C, 41°C, 42°C, 43°C, 44°C, 45°C, 46°C, 47°C, 48°C, 49°C, 50°C, etc. The removal of excess solvent through the aforementioned low-temperature freezing and reduced-pressure concentration operation facilitates the subsequent removal of waxes from the extract.

[0084] S04 is the alcohol precipitation step, which involves mixing supercritical extract with alcohol solvent and precipitating wax under ultrasonic conditions.

[0085] In some possible implementations, supercritical fluid extract of coffee beans is mixed with a high-concentration alcohol solvent at a predetermined mass ratio and then subjected to ultrasonic treatment. Specifically, the mass fraction of the alcohol solvent is 90% to 99%. The mass ratio of the supercritical fluid extract to the alcohol solvent is 1:(1 to 9); exemplaryly, the mass fraction of the alcohol solvent can be any one or any range of two values, such as 90%, 91%, 92%, 94%, 95%, 96%, 98%, 99%, etc., for example, the mass fraction of the alcohol solvent can be 95% to 99%. For example, 95% to 99% ethanol solvent can be used.

[0086] Furthermore, the mass ratio of the supercritical extract to the alcohol solvent is 1:(1-9); for example, the mass ratio of the supercritical extract to the alcohol solvent can be set to any one or a range between any two values, such as 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, etc. By mixing the supercritical extract and the alcohol solvent according to the above-mentioned mass ratio, the wax in the coffee bean supercritical extract can be fully dissolved by the high concentration of alcohol solvent, thereby significantly improving the quality of the coffee bean extract.

[0087] Furthermore, by adding a high concentration of alcohol solvent to the supercritical coffee bean extract and supplementing it with ultrasonic treatment to better remove waxy components (such as long-chain fatty acids, higher alkanes, and higher olefins), the residual oily substances in the coffee bean extract are significantly reduced, thus improving the quality of the coffee bean extract. At the same time, by further processing to remove impurities and solvents from the coffee bean extract, the coffee bean extract is purified, thereby further improving its quality.

[0088] In some possible implementations, after mixing the supercritical extract of coffee beans with an alcohol solvent to form a mixed alcohol solution, the solution is placed in an ultrasonic instrument for further ultrasonic treatment, thereby promoting the full dissolution of the supercritical extract of coffee beans and the alcohol solvent. Specifically, the duration of ultrasonic treatment is 40 min to 80 min; exemplaryly, the duration of ultrasonic treatment can be set to any one or a range between any two values ​​of 40 min, 50 min, 60 min, 70 min, 80 min, etc.

[0089] Furthermore, the ultrasonic treatment temperature is 25℃~60℃; for example, the ultrasonic treatment temperature can be set to any one or any two values ​​of 25℃, 30℃, 35℃, 40℃, 45℃, 50℃, 55℃, 60℃, etc.

[0090] Furthermore, the ultrasonic frequency of the ultrasonic treatment is 30kHz to 50kHz; for example, the ultrasonic frequency of the ultrasonic treatment can be set to any one of 30kHz, 35kHz, 40kHz, 45kHz, 50kHz, etc., or a range formed between any two values.

[0091] By adding a high concentration of alcohol solvent to the supercritical coffee bean extract and then subjecting it to ultrasonic treatment under the aforementioned conditions to remove waxy components, the residual oily substances in the coffee bean extract are reduced, significantly improving the quality of the coffee bean extract.

[0092] S05 is the step of allowing the mixed solution of alcohol-precipitated waxes to stand and extracting the supernatant.

[0093] In some possible implementations, the settling process includes allowing the mixed solution to stand at a temperature of -4°C to 4°C for 12 to 24 hours. Exemplarily, the settling temperature can be set to any one or a range between any two values, such as -1°C, -2°C, -3°C, -4°C, 0°C, 1°C, 2°C, 3°C, 4°C, etc. Exemplarily, the settling duration can be any one or a range between any two values, such as 12 hours, 14 hours, 15 hours, 16 hours, 18 hours, 20 hours, 22 hours, 24 hours, etc.

[0094] The aforementioned low-temperature settling process reduces the solubility of waxes and some impurities in the solvent, causing them to precipitate and settle at the bottom, thereby purifying the coffee bean extract and improving its quality.

[0095] The mixed solution after low-temperature settling treatment will produce suspended and insoluble substances, resulting in a low purity supernatant. Further purification of the supernatant is possible. In some possible implementations, supernatant extraction includes centrifuging the settling solution at a speed of 6000 r / min to 8000 r / min for 30 min to 60 min, and then collecting the supernatant. Exemplarily, the centrifugation speed can be set to any one or a range between any two values ​​from 6000 r / min, 6500 r / min, 7000 r / min, 7500 r / min, 8000 r / min, etc. Exemplarily, the centrifugation duration can be set to any one or a range between any two values ​​from 30 min, 35 min, 40 min, 45 min, 50 min, 55 min, 60 min, etc.

[0096] Specifically, the mixed solvent, after being allowed to stand, is placed in a high-speed centrifuge and centrifuged under the conditions described above to obtain a supernatant. This centrifugation method allows for the rapid separation of insoluble matter from the supernatant, improving its purity. While filtration or sedimentation can also be used to extract the supernatant, centrifugation offers a faster and higher-quality extraction process.

[0097] Step S06 involves desolventizing the supernatant to obtain the final target product, namely coffee bean extract.

[0098] In some possible implementations, desolventizing the supernatant includes evaporating and concentrating the supernatant at a heating temperature of 40°C to 50°C. Exemplarily, the heating temperature for evaporation and concentration can be set to any one or a range between any two of 40°C, 42°C, 45°C, 48°C, 50°C, etc. This desolventizing process effectively removes excess alcohol solvent, thus improving the user experience when used in aerosol generation matrices and reducing the risk of contamination in the heating device, thereby increasing the reliability of the equipment.

[0099] Specifically, the supernatant can be placed in a rotary evaporator and concentrated under the aforementioned temperature conditions. By desolventizing the supernatant, excess alcohol solvent can be removed, making it less likely to affect the taste of the coffee bean extract during use. Furthermore, it is less prone to spontaneous combustion during the heating process of the aerogel matrix. Therefore, the solvent desolventizing method in this embodiment can significantly reduce the risk of using the heating equipment and improve its reliability.

[0100] Secondly, this application provides an embodiment of a coffee bean extract. Specifically, the coffee bean extract of this application embodiment is prepared by the preparation method provided in the first aspect of this application embodiment.

[0101] The coffee bean extract provided in this application embodiment has excellent quality. When this coffee bean extract is used in the aerosol generation matrix, it not only has a good taste but also dissolves well, making the heating device less prone to carbon buildup or even burnt core, thereby improving the service life of the heating device and the user experience.

[0102] Thirdly, embodiments of this application provide an aerosol generating matrix. Specifically, the aerosol generating matrix of this application contains the coffee bean extract provided in the second aspect of this application, that is, it includes the coffee bean extract prepared by the preparation method provided in the first aspect of this application.

[0103] The aerosol generating matrix provided in this application embodiment contains a coffee bean extract unique to this application embodiment. Specifically, the coffee bean extract is obtained from coffee beans through a specific process: first, aroma and flavor substances are efficiently extracted from coffee beans using supercritical fluid extraction, thereby enhancing the olfactory and gustatory experience of the extract; then, some impurities are removed by freeze filtration, and the extract is further concentrated for subsequent alcohol precipitation of waxes. Specifically, the concentrated supercritical extract is mixed with an alcohol solvent and subjected to ultrasonic treatment, followed by static extraction of the supernatant. This significantly reduces residual oily substances in the coffee bean extract. Finally, further solvent removal treatment purifies the coffee bean extract, thereby further improving its quality. Based on this, the aerosol generating matrix of this application embodiment not only has a good user taste but also dissolves well, making the heating device used to heat the aerosol generating matrix less prone to carbon buildup or even scorching, thus improving the lifespan of the heating device and the user experience.

[0104] In some possible implementations, the aerosol generating matrix includes coffee bean extract and a polyol solvent. A liquid aerosol generating matrix formulated with the polyol solvent and the aforementioned coffee bean extract can be well-suited for use in liquid heating devices.

[0105] In some possible implementations, coffee bean extract accounts for 2% to 5% of the total mass of the aerosol generating matrix. For example, the mass percentage of coffee bean extract in the aerosol generating matrix can be set to any one or a range between any two values, such as 2%, 3%, 4%, and 5%. By controlling the proportion of coffee bean extract in the aerosol generating matrix within the above range, the taste of the aerosol generating matrix can be effectively adjusted, improving the user experience.

[0106] In some possible implementations, the polyol solvent in the aerosol generating matrix includes at least one of glycerol, ethylene glycol, propylene glycol, butylene glycol, and diethylene glycol. The coffee bean extract formulated with this polyol solvent is safe to use and can effectively adjust the taste of the aerosol generating matrix.

[0107] In some possible implementations, the preparation of the aerosol generating matrix in this application embodiment may include the following steps: mixing the coffee bean extract of this application embodiment with a polyol solvent to obtain the aerosol generating matrix. The coffee bean extract is prepared using the method described above. By using the coffee bean extract prepared by the method of this application embodiment as a raw material to prepare the aerosol generating matrix, the quality and taste of the aerosol generating matrix can be improved. By better removing the wax from the coffee bean extract, the risk of carbon buildup or even core burning during the use of the aerosol generating matrix in the heating device is reduced, thereby improving the user's vaping experience.

[0108] Fourthly, embodiments of this application provide a liquid heating device. Specifically, the liquid heating device of this application includes a heating core and an aerosol generating matrix inserted into the heating core. The aerosol generating matrix is ​​the aerosol generating matrix provided in the third aspect of this application, which contains coffee bean extract prepared by the method for preparing coffee bean extract provided in the first aspect of this application.

[0109] The aerosol generating matrix contained in the heating core of the liquid heating device in this application embodiment contains coffee bean extract prepared by the method for preparing coffee bean extract provided in this application embodiment. Therefore, the aerosol generating matrix not only has a good taste but also has a good solubility, making the liquid heating device in this application embodiment less prone to carbon buildup or even core burning, thereby improving the service life of the liquid heating device and the user experience.

[0110] In some possible implementations, the heating element of the liquid heating device in this application embodiment includes a ceramic heating element. Ceramic heating elements have high thermal efficiency and long lifespan, and the aerosol generation matrix in this application embodiment has minimal impact on them, thereby further improving the service life of the liquid heating device.

[0111] The following description is based on specific embodiments.

[0112] Example 1 A method for preparing a coffee bean extract includes the following steps: Step (1): Provide 200g of dried coffee beans, roast at 210℃ for 20 minutes, and cool for later use.

[0113] Step (2): Grind the cooled coffee beans into coffee powder, pass it through a 30-mesh sieve, and set aside.

[0114] Step (3): Add 240g of ethanol to the supercritical entrainer tank, add the above coffee bean powder to the supercritical entrainer for supercritical carbon dioxide extraction, the extraction pressure is 25Mpa, the extraction temperature is 42℃, the extraction time is 2h, and the supercritical extract is obtained.

[0115] Step (4): Freeze the supercritical extract at -30°C for 24 hours, filter to remove impurities while cold, and obtain the separated product. Concentrate under reduced pressure at 40°C to obtain the supercritical extract.

[0116] Step (5): Take 50g of supercritical extract and 50g of 95% ethanol and mix them evenly in a reaction flask. Place the mixture in an ultrasonic instrument and sonicate it for 60 minutes at 50℃ and 50Hz to obtain a mixed solution.

[0117] Step (6): Place the mixed solution in a refrigerator at -4°C and let it stand for 24 hours. Place the mixed alcohol solution after standing in a high-speed centrifuge and centrifuge for 30 minutes, then collect the supernatant; the speed of the high-speed centrifuge is set to 6000 r / min. Step (7): Place the supernatant in a rotary evaporator and evaporate and concentrate it at 40°C until no alcohol solvent remains, to obtain coffee bean extract.

[0118] An aerosol-generating matrix: prepared by mixing the coffee bean extract described above with a polyol solvent. The polyol solvent is a mixture of propylene glycol and glycerol in a 1:1 mass ratio, and the coffee bean extract constitutes 2% of the aerosol-generating matrix by mass.

[0119] Example 2 A method for preparing a coffee bean extract includes the following steps: Step (1): Provide 200g of dried coffee beans, roast at 210℃ for 20 minutes, and cool for later use.

[0120] Step (2): Grind the cooled coffee beans into coffee powder, pass it through a 30-mesh sieve, and set aside.

[0121] Step (3): Add 100g of ethanol to the supercritical entrainer tank, add the above coffee bean powder to the supercritical entrainer for supercritical carbon dioxide extraction, the extraction pressure is 25Mpa, the extraction temperature is 42℃, the extraction time is 2h, and the supercritical extract is obtained.

[0122] Step (4): Freeze the supercritical extract at -30°C for 24 hours, filter to remove impurities while cold, and obtain the separated product. Concentrate under reduced pressure at 40°C to obtain the supercritical extract.

[0123] Step (5): Take 50g of supercritical extract and 50g of 95% ethanol and mix them evenly in a reaction flask. Place the mixture in an ultrasonic instrument and sonicate it for 60 minutes at 50℃ and 50Hz to obtain a mixed solution.

[0124] Step (6): Place the mixed solution in a refrigerator at -4°C and let it stand for 24 hours. Place the mixed alcohol solution after standing in a high-speed centrifuge and centrifuge for 30 minutes, then collect the supernatant; the speed of the high-speed centrifuge is set to 6000 r / min. Step (7): Place the supernatant in a rotary evaporator and evaporate and concentrate it at 40°C until no alcohol solvent remains, to obtain coffee bean extract.

[0125] An aerosol-generating matrix: prepared by mixing the coffee bean extract described above with a polyol solvent. The polyol solvent is a mixture of propylene glycol and glycerol in a 1:1 mass ratio, and the coffee bean extract constitutes 2% of the aerosol-generating matrix by mass.

[0126] Example 3 A method for preparing a coffee bean extract includes the following steps: Step (1): Provide 200g of dried coffee beans, roast at 210℃ for 20 minutes, and cool for later use.

[0127] Step (2): Grind the cooled coffee beans into coffee powder, pass it through a 30-mesh sieve, and set aside.

[0128] Step (3): Add 240g of ethanol to the supercritical entrainer tank, add the above coffee bean powder to the supercritical entrainer for supercritical carbon dioxide extraction, the extraction pressure is 25Mpa, the extraction temperature is 42℃, the extraction time is 3h, and the supercritical extract is obtained.

[0129] Step (4): Freeze the supercritical extract at -30°C for 24 hours, filter to remove impurities while cold, and obtain the separated product. Concentrate under reduced pressure at 40°C to obtain the supercritical extract.

[0130] Step (5): Take 50g of supercritical extract and 50g of 95% ethanol and mix them evenly in a reaction flask. Place the mixture in an ultrasonic instrument and sonicate it for 60 minutes at 50℃ and 50Hz to obtain a mixed solution.

[0131] Step (6): Place the mixed solution in a refrigerator at -4°C and let it stand for 24 hours. Place the mixed alcohol solution after standing in a high-speed centrifuge and centrifuge for 30 minutes, then collect the supernatant; the speed of the high-speed centrifuge is set to 6000 r / min. Step (7): Place the supernatant in a rotary evaporator and evaporate and concentrate it at 40°C until no alcohol solvent remains, to obtain coffee bean extract.

[0132] An aerosol-generating matrix: prepared by mixing the coffee bean extract described above with a polyol solvent. The polyol solvent is a mixture of propylene glycol and glycerol in a 1:1 mass ratio, and the coffee bean extract constitutes 2% of the aerosol-generating matrix by mass.

[0133] Example 4 A method for preparing a coffee bean extract includes the following steps: Step (1): Provide 200g of dried coffee beans, roast at 210℃ for 20 minutes, and cool for later use.

[0134] Step (2): Grind the cooled coffee beans into coffee powder, pass it through a 30-mesh sieve, and set aside.

[0135] Step (3): Add 240g of ethanol to the supercritical entrainer tank, add the above coffee bean powder to the supercritical entrainer for supercritical carbon dioxide extraction, the extraction pressure is 25Mpa, the extraction temperature is 42℃, the extraction time is 2h, and the supercritical extract is obtained.

[0136] Step (4): Freeze the supercritical extract at -30°C for 24 hours, filter to remove impurities while cold, and obtain the separated product. Concentrate under reduced pressure at 40°C to obtain the supercritical extract.

[0137] Step (5): Take 50g of supercritical extract and 100g of 95% ethanol and mix them evenly in a reaction flask. Place the mixture in an ultrasonic instrument and sonicate it for 60min at 50℃ and 50Hz to obtain a mixed solution.

[0138] Step (6): Place the mixed solution in a refrigerator at -4°C and let it stand for 24 hours. Place the mixed alcohol solution after standing in a high-speed centrifuge and centrifuge for 30 minutes, then collect the supernatant; the speed of the high-speed centrifuge is set to 6000 r / min. Step (7): Place the supernatant in a rotary evaporator and evaporate and concentrate it at 40°C until no alcohol solvent remains, to obtain coffee bean extract.

[0139] An aerosol-generating matrix: prepared by mixing the coffee bean extract described above with a polyol solvent. The polyol solvent is a mixture of propylene glycol and glycerol in a 1:1 mass ratio, and the coffee bean extract constitutes 2% of the aerosol-generating matrix by mass.

[0140] Example 5 A method for preparing a coffee bean extract includes the following steps: Step (1): Provide 200g of dried coffee beans, roast at 190℃ for 10 minutes, and cool for later use.

[0141] Step (2): Grind the cooled coffee beans into coffee powder, pass it through a 30-mesh sieve, and set aside.

[0142] Step (3): Add 240g of ethanol to the supercritical entrainer tank, add the above coffee bean powder to the supercritical entrainer for supercritical carbon dioxide extraction, the extraction pressure is 25Mpa, the extraction temperature is 42℃, the extraction time is 2h, and the supercritical extract is obtained.

[0143] Step (4): Freeze the supercritical extract at -30°C for 24 hours, filter to remove impurities while cold, and obtain the separated product. Concentrate under reduced pressure at 40°C to obtain the supercritical extract.

[0144] Step (5): Take 50g of supercritical extract and 50g of 95% ethanol and mix them evenly in a reaction flask. Place the mixture in an ultrasonic instrument and sonicate it for 60 minutes at 50℃ and 50Hz to obtain a mixed solution.

[0145] Step (6): Place the mixed solution in a refrigerator at -4°C and let it stand for 24 hours. Place the mixed alcohol solution after standing in a high-speed centrifuge and centrifuge for 30 minutes, then collect the supernatant; the speed of the high-speed centrifuge is set to 6000 r / min. Step (7): Place the supernatant in a rotary evaporator and evaporate and concentrate it at 40°C until no alcohol solvent remains, to obtain coffee bean extract.

[0146] An aerosol-generating matrix: prepared by mixing the coffee bean extract described above with a polyol solvent. The polyol solvent is a mixture of propylene glycol and glycerol in a 1:1 mass ratio, and the coffee bean extract constitutes 2% of the aerosol-generating matrix by mass.

[0147] Example 6 A method for preparing a coffee bean extract includes the following steps: Step (1): Provide 200g of dried coffee beans, roast at 210℃ for 20 minutes, and cool for later use.

[0148] Step (2): Grind the cooled coffee beans into coffee powder, pass it through a 30-mesh sieve, and set aside.

[0149] Step (3): Add 240g of ethanol to the supercritical entrainer tank, add the above coffee bean powder to the supercritical entrainer for supercritical carbon dioxide extraction, the extraction pressure is 25Mpa, the extraction temperature is 42℃, the extraction time is 2h, and the supercritical extract is obtained.

[0150] Step (4): Freeze the supercritical extract at -60℃ for 24 hours, filter to remove impurities while cold, and obtain the separated product. Concentrate under reduced pressure at 40℃ to obtain the supercritical extract.

[0151] Step (5): Take 50g of supercritical extract and 50g of 95% ethanol and mix them evenly in a reaction flask. Place the mixture in an ultrasonic instrument and sonicate it for 60 minutes at 50℃ and 50Hz to obtain a mixed solution.

[0152] Step (6): Place the mixed solution in a refrigerator at -4°C and let it stand for 24 hours. Place the mixed alcohol solution after standing in a high-speed centrifuge and centrifuge for 30 minutes, then collect the supernatant; the speed of the high-speed centrifuge is set to 6000 r / min. Step (7): Place the supernatant in a rotary evaporator and evaporate and concentrate it at 40°C until no alcohol solvent remains, to obtain coffee bean extract.

[0153] An aerosol-generating matrix: prepared by mixing the coffee bean extract described above with a polyol solvent. The polyol solvent is a mixture of propylene glycol and glycerol in a 1:1 mass ratio, and the coffee bean extract constitutes 2% of the aerosol-generating matrix by mass.

[0154] Example 7 A method for preparing a coffee bean extract includes the following steps: Step (1): Provide 200g of dried coffee beans, roast at 210℃ for 20 minutes, and cool for later use.

[0155] Step (2): Grind the cooled coffee beans into coffee powder, pass it through a 30-mesh sieve, and set aside.

[0156] Step (3): Add 100g of propylene glycol to the supercritical entrainer tank, add the above coffee bean powder to the supercritical entrainer for supercritical carbon dioxide extraction, the extraction pressure is 25Mpa, the extraction temperature is 42℃, the extraction time is 2h, and the supercritical extract is obtained.

[0157] Step (4): Freeze the supercritical extract at -30°C for 24 hours, filter to remove impurities while cold, and obtain the separated product. Concentrate under reduced pressure at 40°C to obtain the supercritical extract.

[0158] Step (5): Take 50g of supercritical extract and 50g of 95% ethanol and mix them evenly in a reaction flask. Place the mixture in an ultrasonic instrument and sonicate it for 60 minutes at 50℃ and 50Hz to obtain a mixed solution.

[0159] Step (6): Place the mixed solution in a refrigerator at -4°C and let it stand for 24 hours. Place the mixed alcohol solution after standing in a high-speed centrifuge and centrifuge for 30 minutes, then collect the supernatant; the speed of the high-speed centrifuge is set to 6000 r / min. Step (7): Place the supernatant in a rotary evaporator and evaporate and concentrate it at 40°C until no alcohol solvent remains, to obtain coffee bean extract.

[0160] An aerosol-generating matrix: prepared by mixing the coffee bean extract described above with a polyol solvent. The polyol solvent is a mixture of propylene glycol and glycerol in a 1:1 mass ratio, and the coffee bean extract constitutes 2% of the aerosol-generating matrix by mass.

[0161] Comparative Example 1 A method for preparing a coffee bean extract includes the following steps: Step (1): Provide 200g of dried coffee beans, roast at 210℃ for 20 minutes, and cool for later use.

[0162] Step (2): Grind the cooled coffee beans into coffee powder, pass it through a 30-mesh sieve, and set aside.

[0163] Step (3): Add 240g of ethanol to the supercritical entrainer tank, add the above coffee bean powder to the supercritical entrainer for supercritical carbon dioxide extraction, the extraction pressure is 25Mpa, the extraction temperature is 42℃, the extraction time is 2h, and the supercritical extract is obtained.

[0164] Step (4): Freeze the supercritical extract at -30℃ for 24 hours, filter to remove impurities while cold, and obtain the separated product. After concentration under reduced pressure at 40℃, the supercritical extract is obtained as coffee bean extract.

[0165] An aerosol-generating matrix: prepared by mixing the coffee bean extract described above with a polyol solvent. The polyol solvent is a mixture of propylene glycol and glycerol in a 1:1 mass ratio, and the coffee bean extract constitutes 2% of the aerosol-generating matrix by mass.

[0166] Comparative Example 2 A method for preparing a coffee bean extract includes the following steps: Step (1): Provide 200g of dried coffee beans, roast at 210℃ for 20 minutes, and cool for later use.

[0167] Step (2): Grind the cooled coffee beans into coffee powder, pass it through a 30-mesh sieve, and set aside.

[0168] Step (3): Add 240g of ethanol to the supercritical entrainer tank, add the above coffee bean powder to the supercritical entrainer for supercritical carbon dioxide extraction, the extraction pressure is 25Mpa, the extraction temperature is 42℃, the extraction time is 2h, and the supercritical extract is obtained.

[0169] Step (4): The supercritical extract is obtained by directly concentrating the supercritical extract at 40°C under reduced pressure.

[0170] Step (5): Take 50g of supercritical extract and 50g of 95% ethanol and mix them evenly in a reaction flask. Place the mixture in an ultrasonic instrument and sonicate it for 60 minutes at 50℃ and 50Hz to obtain a mixed solution.

[0171] Step (6): Place the mixed solution in a refrigerator at -4°C and let it stand for 24 hours. Place the mixed alcohol solution after standing in a high-speed centrifuge and centrifuge for 30 minutes, then collect the supernatant; the speed of the high-speed centrifuge is set to 6000 r / min. Step (7): Place the supernatant in a rotary evaporator and evaporate and concentrate it at 40°C until no alcohol solvent remains, to obtain coffee bean extract.

[0172] An aerosol-generating matrix: prepared by mixing the coffee bean extract described above with a polyol solvent. The polyol solvent is a mixture of propylene glycol and glycerol in a 1:1 mass ratio, and the coffee bean extract constitutes 2% of the aerosol-generating matrix by mass.

[0173] Comparative Example 3 A method for preparing a coffee bean extract includes the following steps: Step (1): Provide 200g of dried coffee beans, roast at 210℃ for 20 minutes, and cool for later use.

[0174] Step (2): Grind the cooled coffee beans into coffee powder, pass it through a 30-mesh sieve, and set aside.

[0175] Step (3): Add 240g of ethanol to the supercritical entrainer tank, add the above coffee bean powder to the supercritical entrainer for supercritical carbon dioxide extraction, the extraction pressure is 25Mpa, the extraction temperature is 42℃, the extraction time is 2h, and the supercritical extract is obtained.

[0176] Step (4): Freeze the supercritical extract at -30°C for 24 hours, filter to remove impurities while cold, and obtain the separated product. Concentrate under reduced pressure at 40°C to obtain the supercritical extract.

[0177] Step (5): Take 50g of supercritical extract and 50g of 95% ethanol and mix them evenly in a reaction flask. Place the mixture in an ultrasonic instrument and sonicate it for 60 minutes at 50℃ and 50Hz to obtain a mixed solution.

[0178] Step (6): Place the above mixed solution directly into a rotary evaporator and evaporate and concentrate it at 40°C until no alcohol solvent is available, to obtain coffee bean extract.

[0179] An aerosol-generating matrix: prepared by mixing the coffee bean extract described above with a polyol solvent. The polyol solvent is a mixture of propylene glycol and glycerol in a 1:1 mass ratio, and the coffee bean extract constitutes 2% of the aerosol-generating matrix by mass.

[0180] Performance testing: (1) Taste evaluation: The aerosol generating matrices prepared in Examples 1-7 and Comparative Examples 1-3 of this application were injected into the ceramic heating core of the electronic heating device for taste evaluation. The evaluators were randomly selected industry tasters, all of whom had more than two years of taste evaluation experience. A total of 15 people conducted the evaluation. Based on the characteristics of coffee bean extract, the evaluation items included sweetness, aroma, bitterness, flavor layering, overall pleasantness and off-flavors. Each item was scored from 1 to 10 points, with higher scores indicating higher evaluation (better). The evaluation time was 30 minutes for each item. The scores from the 15 tasters were collected and averaged (the average was rounded to the nearest integer). The results are shown in Table 1 below.

[0181] Table 1

[0182] According to the data recorded in Table 1, the aerosol generating matrices provided in Examples 1-7 of this application have fewer impurities and received high ratings from tasters. This is likely because a large amount of impurities and waxes were removed during the preparation of the coffee bean extract. However, the tasters rated the comparative examples 1-3 for impurities lower. This may be because the comparative examples lacked important processing steps or operations compared to the examples of this application, resulting in ineffective removal of impurities and waxes from the coffee bean extracts. Consequently, their content was too high, leading to a decrease in overall pleasantness, and therefore, they were generally lower than those in Examples 1-7 of this application.

[0183] (2) Machine-drawn core test: The aerosol-generating matrices prepared in Examples 1-7 and Comparative Examples 1-3 of this application were injected into the ceramic heating core of the electronic heating device. A suction machine was used for aspiration (suction parameters set as follows: suction volume 55 mL, suction time 3 s, interval between two suctions 20 s), and a mechanical suction core-paste test was performed. The test results are shown in Table 2 below. Meanwhile, the states of the ceramic heating cores in Examples 1-7 and Comparative Examples 1-3 during the mechanical suction core-paste test are as follows: Figure 2-11 As shown.

[0184] Table 2

[0185] Record the data according to Table 2 and Figures 2-11 The results show that the aerosol generating matrix provided in Examples 1-7 of this application had a much higher number of suction cycles in the mechanical suction core test than the aerosol generating matrix provided in Comparative Examples 1 and 3, and was less likely to cause the ceramic heating core to burn out, while the comparative examples showed severe carbon buildup. Although Comparative Example 2 was better than the other comparative examples, it was still worse than the test results of Examples 1-7 of this application. It is speculated that this may be because the preparation process of coffee bean extract did not include freezing and settling or filtration after supercritical extraction, which affected the user experience and the lifespan of the ceramic core.

[0186] In summary, the method for preparing coffee bean extract provided in this application can efficiently extract aroma and flavor substances from coffee beans by using supercritical extraction, thereby enhancing the olfactory and gustatory experience of the extract. Furthermore, freeze filtration can remove some impurities and further concentrate the extract for subsequent alcohol precipitation of waxes. Alcohol precipitation of waxes is carried out under conditions of alcohol solvent and ultrasonic treatment, which can better remove wax components, thereby reducing residual oily substances in the coffee bean extract and improving its quality. Simultaneously, further processing removes impurities and solvents from the coffee bean extract, achieving purification and further improving its quality. This addresses the shortcomings of poor dissolution of the aerosol generation matrix and severe carbon buildup or even core scorching in the heating core when coffee bean extract is used in the aerosol generation matrix of a liquid heating device.

[0187] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for the preparation of a coffee bean extract, characterized in that, The method comprises the following steps: crushing coffee beans to obtain coffee bean powder; subjecting the coffee bean powder to supercritical extraction to obtain supercritical extraction material; concentrating the separation product obtained after the supercritical extraction material is frozen and filtered to obtain a supercritical extract; mixing the supercritical extract with an alcohol solvent and subjecting the mixture to ultrasonic treatment to obtain a mixed solution; standing the mixed solution to obtain supernatant; subjecting the supernatant to desolventization to obtain a coffee bean extract.

2. The production method according to claim 1, wherein The supercritical extraction comprises supercritical carbon dioxide extraction, and the supercritical carbon dioxide extraction is performed under one or more of the following conditions: (1) the extraction pressure is 15 MPa to 30 MPa; (2) the extraction temperature is 35°C to 45°C; (3) the extraction time is 1 h to 3 h; (4) the extraction is performed in the presence of an entrainer, and the entrainer comprises at least one of an alcohol solvent, an ester solvent, and a ketone solvent, and / or the mass of the entrainer is 0.2 to 3 times the mass of the coffee bean powder.

3. The production method according to claim 2, wherein The alcohol solvent in the entrainer comprises at least one of methanol, ethanol, propanol, and propylene glycol; and / or, the ester solvent in the entrainer comprises at least one of ethyl formate and ethyl acetate; and / or, the ketone solvent in the entrainer comprises at least one of acetone and butanone.

4. The production method according to claim 1, wherein The freezing and filtering comprises freezing and standing at a temperature of -80°C to -10°C for 12 h to 24 h, and then filtering to remove impurities; and / or, the concentration treatment comprises concentration under reduced pressure at a temperature of 40°C to 50°C.

5. The production method according to claim 1, wherein In the step of mixing the supercritical extract with an alcohol solvent, the mass ratio of the supercritical extract to the alcohol solvent is 1:(1-9); and / or, the alcohol solvent comprises an ethanol solution; and / or, the mass fraction of the alcohol solvent is 90% to 99%.

6. The production method according to claim 1, wherein The ultrasonic treatment is performed under one or more of the following conditions: (1) the ultrasonic treatment is performed for 40 min to 80 min; (2) the ultrasonic treatment is performed at a temperature of 25°C to 60°C; (3) the ultrasonic treatment is performed at an ultrasonic frequency of 30 kHz to 50 kHz.

7. The production method according to any one of claims 1 to 6, wherein The standing treatment comprises standing the mixed solution at a temperature of -4°C to 4°C for 12 h to 24 h.

8. The production method according to any one of claims 1 to 6, wherein The supernatant is obtained by centrifuging the mixed solution after the standing treatment at a rotation speed of 6000 r / min to 8000 r / min for 30 min to 60 min.

9. The production method according to any one of claims 1 to 6, wherein The desolventization of the supernatant comprises evaporation and concentration of the supernatant at a heating temperature of 40°C to 50°C.

10. The production method according to any one of claims 1 to 6, wherein The crushing of the coffee beans comprises grinding the coffee beans into coffee bean powder with a particle size of 20 to 200 mesh; and / or, before the crushing of the coffee beans, the coffee beans are baked at a temperature of 190°C to 255°C for 5 min to 45 min.

11. A coffee bean extract, characterized in that, The coffee bean extract is prepared by the method of any one of claims 1-10.

12. An aerosol generating substrate, characterised in that, The aerosol generating substrate contains the coffee bean extract of claim 11.

13. An aerosol generating substrate according to claim 12, wherein, The aerosol generating substrate comprises the coffee bean extract and a polyol solvent.

14. An aerosol generating substrate according to claim 13, wherein, The coffee bean extract accounts for 2% to 5% of the mass of the aerosol generating substrate. And / or, the polyol solvent comprises at least one of glycerol, ethylene glycol, propylene glycol, butylene glycol, diethylene glycol.

15. A liquid heating apparatus, characterised in that, An aerosol generating article comprising a heating element and an aerosol generating substrate as claimed in any of claims 12 to 14 disposed within the heating element.

16. The liquid heating device of claim 15, wherein, The heating element comprises a ceramic heating element.

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