Long-lasting fragrance spice mixture and preparation method thereof

Abstract

The present invention discloses a long-lasting fragrance mixture and its preparation method, relating to the technical field of fragrance preparation methods. The fragrance mixture comprises a natural essential oil and a modified carrier; the modified carrier is a porous particle carrier that has been sequentially treated with ethyl acetate and cyclodextrin. The core of the present invention is to provide a modified fragrance carrier particle. Through the synergistic effect of three modifiers, the resulting fragrance's fragrance duration is significantly improved, especially for natural essential oils with a relatively short fragrance duration.

Description

Technical Field

[0001] The invention provides a long-lasting fragrance-retaining spice mixture and a preparation method thereof, and relates to the technical field of spice preparation methods. Background Art

[0002] Natural fragrances are often prepared using extraction methods, with steam distillation being widely used due to its simple equipment, ease of operation, and low cost. For example, in the extraction of botanical natural fragrances, steam distillation heats the plant material, causing the aromatic oils to evaporate with the steam, which is then collected by condensation to yield the essential oils. Furthermore, leaching is also a commonly used natural fragrance extraction technique, offering the advantage of being able to extract a larger amount of substances in a gentle process that does not damage the aroma components. However, this method is also susceptible to impurities and is relatively costly.

[0003] The production of synthetic fragrances primarily relies on chemical reactions. For example, alcohol fragrances are typically synthesized through processes such as hydrolysis of halogenated hydrocarbons and hydration of olefins. These chemical reactions require specialized equipment and conditions, such as stirred tank reactors and distillation equipment. While synthetic fragrance production offers the advantages of low cost, high yield, and consistent quality, it can also introduce chemical residues and potential safety risks.

[0004] Both natural and synthetic fragrances have certain drawbacks when it comes to fragrance longevity. A fragrance's longevity is affected by a variety of factors, including its molecular weight, vapor pressure, boiling point, and chemical structure. Generally speaking, fragrances with higher molecular weights, lower vapor pressures, and higher boiling points have longer fragrance longevity. However, in practical applications, many fragrances exhibit unsatisfactory fragrance longevity due to these physical property limitations.

[0005] Among fragrances, natural essential oils have varying evaporation rates depending on their composition and molecular weight. Some essential oils, such as basil and bergamot, evaporate quickly, and their fragrance may only last a few hours to a day. Other essential oils, such as chamomile and geranium, evaporate at a moderate rate, and their fragrance can linger for several days. In addition to the properties of the essential oil itself, environmental conditions such as temperature and humidity also affect its evaporation rate and fragrance duration. The purity and storage method of the essential oil also affect its fragrance duration. Essential oils of high purity and proper storage tend to retain their fragrance longer. Compared to some synthetic fragrances or artificially blended perfumes, some natural essential oils may indeed have a shorter fragrance duration. This is because synthetic fragrances can be chemically manipulated for volatility and stability, while natural essential oils are products of nature and have relatively fixed properties. It is worth noting that the fragrance of premium fragrances such as ambergris and agarwood can linger for months, far exceeding that of ordinary fragrances. Consequently, the fragrance duration of natural essential oil fragrances varies widely, limiting their application scenarios.

[0006] Furthermore, the fragrance's longevity is also affected by external environmental conditions, such as temperature, humidity, and air circulation. In environments with high temperatures, high humidity, or poor air circulation, fragrance volatilization is accelerated, shortening its longevity. This not only affects the fragrance's effectiveness but also increases its cost.

[0007] To extend the scent of fragrances, the addition of fixatives is currently a common method. These agents slow the volatile nature of fragrances, thereby enhancing their longevity. However, the selection and use of fixatives must also consider their impact on the fragrance's aroma characteristics and safety concerns.

[0008] In summary, current fragrance preparation technologies still face certain shortcomings and challenges in terms of fragrance longevity. In the future, with the advancement of technology and the development of new materials, we look forward to the emergence of more efficient and safe fragrance preparation technologies and methods for extending fragrance longevity. Summary of the Invention

[0009] This invention primarily addresses the need for long-lasting fragrance from natural essential oils and provides a method for preparing a fragrance mixture comprising a modified carrier, which can effectively extend the fragrance duration of various natural essential oils. The specific scheme is as follows:

[0010] A long-lasting fragrance fragrance mixture comprises natural essential oil and a modified carrier; wherein the modified carrier is a porous particle carrier that has been treated with ethyl acetate and cyclodextrin in sequence.

[0011] Preferably, the natural essential oils include one or more of basil essential oil, bergamot essential oil, lemon essential oil, peppermint essential oil, tea tree essential oil, rosemary essential oil, eucalyptus essential oil, black pepper essential oil, citrus essential oil, geranium essential oil, lavender essential oil, rose essential oil, juniper essential oil, patchouli essential oil, vetiver essential oil, sandalwood essential oil, benzoin essential oil, and cinnamon essential oil.

[0012] The preparation method of the above-mentioned long-lasting fragrance fragrance mixture comprises the following steps:

[0013] S1. Clean and dry the porous particle carrier, and soak it in ethyl acetate;

[0014] S2, filtering, drying, and then heat-treating to solidify; after solidification, washing away free ethyl acetate and drying;

[0015] S3, soaking the obtained support in a cyclodextrin aqueous solution and shaking it, and then washing it with water and drying it;

[0016] S4, soaking the obtained support in an ethanol solution of polyvinyl pyrrolidone and stirring, and then washing and drying to obtain a modified support;

[0017] S5. The modified carrier absorbs the natural essential oil to obtain a long-lasting fragrance mixture.

[0018] Preferably, the porous particle carrier in step S1 is porous silica gel particles with a particle size of 5-10 μm, a pore size of 30-50 nm, and a specific surface area of ​​100-500 m 2 / g.

[0019] Preferably, the soaking in step S1 is performed at room temperature for 18-24 hours.

[0020] Preferably, the heat treatment curing in step S2 is performed at a temperature of 60-75° C. for 2-3 hours.

[0021] Preferably, in step S2, free ethyl acetate is washed away by using 85-95 vol% ethanol aqueous solution.

[0022] Preferably, the cyclodextrin in step S3 includes β-cyclodextrin or γ-cyclodextrin.

[0023] Preferably, the content of cyclodextrin in the cyclodextrin aqueous solution in step S3 is 10-15 wt%.

[0024] Preferably, the treatment temperature in step S3 is 35-50°C, and the treatment time is 1-1.5 hours; the temperature of the water used for cleaning is 50-60°C.

[0025] Preferably, the polyvinyl pyrrolidone content in the ethanol solution of polyvinyl pyrrolidone in step S4 is 0.1-0.15 g / mL.

[0026] Preferably, the treatment in step S4 is performed at a temperature of 30-35° C. for 1.5-2 h; and anhydrous ethanol is used for the cleaning.

[0027] Preferably, the adsorption in step S5 is carried out at room temperature for 24-48 hours.

[0028] The beneficial effects of the present invention are:

[0029] The core of the present invention is to provide a modified fragrance carrier particle. By treating porous silica gel with ethyl acetate, cyclodextrin and polyvinyl pyrrolidone in sequence, the fragrance retention time of the obtained fragrance is greatly improved, especially the natural essential oils with a short fragrance retention time. The fragrance retention time is significantly increased. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those familiar to those skilled in the art. Furthermore, any methods and materials similar or equivalent to those described herein can be applied to the present invention. The preferred embodiments and materials described herein are for illustrative purposes only and are not intended to limit the scope of this application.

[0032] The experimental methods in the following examples are all conventional methods unless otherwise specified. The experimental materials used in the following examples are all purchased from commercial channels unless otherwise specified. Among them, the porous silica gel particles used in the examples were purchased from Xiamen Yanke Biotechnology Co., Ltd., with product parameters: particle size 6-9 μm, pore size 35-45 nm, specific surface area 300-450 m 2 / g; Polyvinylpyrrolidone (PVP) K15 was purchased from Hebei Lihua Biotechnology Co., Ltd.

[0033] Example 1 Preparation of a long-lasting fragrance fragrance mixture:

[0034] S1. Clean and dry the porous particle carrier, and soak it in ethyl acetate;

[0035] S2, filtering, drying, and then heat-treating to solidify; after solidification, washing away free ethyl acetate and drying;

[0036] S3, soaking the obtained support in a cyclodextrin aqueous solution and shaking it, and then washing it with water and drying it;

[0037] S4, soaking the obtained support in an ethanol solution of polyvinyl pyrrolidone and stirring, and then washing and drying to obtain a modified support;

[0038] S5. The modified carrier is immersed in natural essential oil for vibration adsorption to obtain a long-lasting fragrance mixture.

[0039] The soaking in step S1 is carried out at room temperature for 18 hours.

[0040] The heat treatment curing in step S2 is performed at a temperature of 60° C. for 2 hours.

[0041] In step S2, free ethyl acetate is washed away by washing with 85 vol% ethanol aqueous solution.

[0042] The cyclodextrin in step S3 includes β-cyclodextrin.

[0043] In the cyclodextrin aqueous solution in step S3, the content of cyclodextrin is 10 wt %.

[0044] The treatment temperature in step S3 is 35°C and the time is 1 hour; the temperature of the water used for cleaning is 50°C.

[0045] In the ethanol solution of polyvinyl pyrrolidone in step S4, the content of polyvinyl pyrrolidone is 0.1 g / mL.

[0046] The treatment in step S4 is performed at a temperature of 30° C. for 1.5 h; and anhydrous ethanol is used for cleaning.

[0047] The adsorption in step S5 is carried out at room temperature for 24 hours.

[0048] After adsorption in step S5, excess essential oil is removed by centrifugal drying at a rotation speed of 3000 rpm for 15 minutes.

[0049] Example 2 Preparation of a long-lasting fragrance flavor mixture:

[0050] S1. Clean and dry the porous particle carrier, and soak it in ethyl acetate;

[0051] S2, filtering, drying, and then heat-treating to solidify; after solidification, washing away free ethyl acetate and drying;

[0052] S3, soaking the obtained support in a cyclodextrin aqueous solution and shaking it, and then washing it with water and drying it;

[0053] S4, soaking the obtained support in an ethanol solution of polyvinyl pyrrolidone and stirring, and then washing and drying to obtain a modified support;

[0054] S5. The modified carrier is immersed in natural essential oil for vibration adsorption to obtain a long-lasting fragrance mixture.

[0055] The soaking in step S1 is carried out at room temperature for 24 hours.

[0056] The heat treatment curing in step S2 is performed at a temperature of 75° C. for 3 hours.

[0057] In step S2, free ethyl acetate is washed away with a 95 vol% ethanol aqueous solution.

[0058] The cyclodextrin in step S3 includes γ-cyclodextrin.

[0059] In the cyclodextrin aqueous solution in step S3, the content of cyclodextrin is 15 wt %.

[0060] The treatment temperature in step S3 is 50°C and the treatment time is 1.5 hours; the temperature of the water used for cleaning is 60°C.

[0061] In the ethanol solution of polyvinyl pyrrolidone in step S4, the content of polyvinyl pyrrolidone is 0.15 g / mL.

[0062] The treatment in step S4 is performed at a temperature of 35° C. for 2 h; and anhydrous ethanol is used for cleaning.

[0063] The adsorption in step S5 is carried out at room temperature for 48 hours.

[0064] After adsorption in step S5, excess essential oil is removed by centrifugal drying at a rotation speed of 3000 rpm for 15 minutes.

[0065] Comparative Example 1

[0066] The difference from Example 2 is that ethyl acetate treatment is not adopted.

[0067] Preparation of the spice mixture:

[0068] S1, clean and dry the porous particle carrier;

[0069] S2, filtering, drying, and then heat treatment; washing and drying;

[0070] S3, soaking the obtained support in a cyclodextrin aqueous solution and shaking it, and then washing it with water and drying it;

[0071] S4, soaking the obtained support in an ethanol solution of polyvinyl pyrrolidone and stirring, and then washing and drying to obtain a modified support;

[0072] S5. The modified carrier is immersed in natural essential oil for vibration adsorption to obtain a long-lasting fragrance mixture.

[0073] The heat treatment in step S2 is performed at a temperature of 75° C. for 3 hours.

[0074] The washing in step S2 is performed with a 95 vol% ethanol aqueous solution.

[0075] The cyclodextrin in step S3 includes γ-cyclodextrin.

[0076] In the cyclodextrin aqueous solution in step S3, the content of cyclodextrin is 15 wt %.

[0077] The treatment temperature in step S3 is 50°C and the treatment time is 1.5 hours; the temperature of the water used for cleaning is 60°C.

[0078] In the ethanol solution of polyvinyl pyrrolidone in step S4, the content of polyvinyl pyrrolidone is 0.15 g / mL.

[0079] The treatment in step S4 is performed at a temperature of 35° C. for 2 h; and anhydrous ethanol is used for cleaning.

[0080] The adsorption in step S5 is carried out at room temperature for 48 hours.

[0081] After adsorption in step S5, excess essential oil is removed by centrifugal drying at a rotation speed of 3000 rpm for 15 minutes.

[0082] Comparative Example 2

[0083] The difference from Example 2 is that cyclodextrin treatment is not used.

[0084] Preparation of the spice mixture:

[0085] S1. Clean and dry the porous particle carrier, and soak it in ethyl acetate;

[0086] S2, filtering, drying, and then heat-treating to solidify; after solidification, washing away free ethyl acetate and drying;

[0087] S3, soaking the obtained carrier in water for shaking treatment, and then drying after completion;

[0088] S4, soaking the obtained support in an ethanol solution of polyvinyl pyrrolidone and stirring, and then washing and drying to obtain a modified support;

[0089] S5. The modified carrier is immersed in natural essential oil for vibration adsorption to obtain a long-lasting fragrance mixture.

[0090] The soaking in step S1 is carried out at room temperature for 24 hours.

[0091] The heat treatment curing in step S2 is performed at a temperature of 75° C. for 3 hours.

[0092] In step S2, free ethyl acetate is washed away with a 95 vol% ethanol aqueous solution.

[0093] The treatment temperature in step S3 is 50° C. and the treatment time is 1.5 h.

[0094] In the ethanol solution of polyvinyl pyrrolidone in step S4, the content of polyvinyl pyrrolidone is 0.15 g / mL.

[0095] The treatment in step S4 is performed at a temperature of 35° C. for 2 h; and anhydrous ethanol is used for cleaning.

[0096] The adsorption in step S5 is carried out at room temperature for 48 hours.

[0097] After adsorption in step S5, excess essential oil is removed by centrifugal drying at a rotation speed of 3000 rpm for 15 minutes.

[0098] Comparative Example 3

[0099] The difference from Example 2 is that PVP treatment is not used.

[0100] Preparation of the spice mixture:

[0101] S1. Clean and dry the porous particle carrier, and soak it in ethyl acetate;

[0102] S2, filtering, drying, and then heat-treating to solidify; after solidification, washing away free ethyl acetate and drying;

[0103] S3, soaking the obtained support in a cyclodextrin aqueous solution and shaking it, and then washing it with water and drying it;

[0104] S4, soaking the obtained support in ethanol and stirring, and drying after completion to obtain a modified support;

[0105] S5. The modified carrier is immersed in natural essential oil for vibration adsorption to obtain a long-lasting fragrance mixture.

[0106] The soaking in step S1 is carried out at room temperature for 24 hours.

[0107] The heat treatment curing in step S2 is performed at a temperature of 75° C. for 3 hours.

[0108] In step S2, free ethyl acetate is washed away with a 95 vol% ethanol aqueous solution.

[0109] The cyclodextrin in step S3 includes γ-cyclodextrin.

[0110] In the cyclodextrin aqueous solution in step S3, the content of cyclodextrin is 15 wt %.

[0111] The treatment temperature in step S3 is 50°C and the treatment time is 1.5 hours; the temperature of the water used for cleaning is 60°C.

[0112] The treatment in step S4 was performed at a temperature of 35° C. for 2 h.

[0113] The adsorption in step S5 is carried out at room temperature for 48 hours.

[0114] After adsorption in step S5, excess essential oil is removed by centrifugal drying at a rotation speed of 3000 rpm for 15 minutes.

[0115] Comparative Example 4

[0116] The difference from Example 2 is that ethyl acetate and cyclodextrin are not used for treatment.

[0117] S1, clean and dry the porous particle carrier;

[0118] S2, filtering, drying, and then heat treatment; washing and drying;

[0119] S3, soaking the obtained carrier in water for shaking treatment, and then drying after completion;

[0120] S4, soaking the obtained support in an ethanol solution of polyvinyl pyrrolidone and stirring, and then washing and drying to obtain a modified support;

[0121] S5. The modified carrier is immersed in natural essential oil for vibration adsorption to obtain a long-lasting fragrance mixture.

[0122] The heat treatment in step S2 is performed at a temperature of 75° C. for 3 hours.

[0123] The washing in step S2 is performed with a 95 vol% ethanol aqueous solution.

[0124] The treatment temperature in step S3 is 50° C. and the treatment time is 1.5 h.

[0125] In the ethanol solution of polyvinyl pyrrolidone in step S4, the content of polyvinyl pyrrolidone is 0.15 g / mL.

[0126] The treatment in step S4 is performed at a temperature of 35° C. for 2 h; and anhydrous ethanol is used for cleaning.

[0127] The adsorption in step S5 is carried out at room temperature for 48 hours.

[0128] After adsorption in step S5, excess essential oil is removed by centrifugal drying at a rotation speed of 3000 rpm for 15 minutes.

[0129] Comparative Example 5

[0130] The difference from Example 2 is that ethyl acetate and PVP treatment are not used.

[0131] S1, clean and dry the porous particle carrier;

[0132] S2, filtering, drying, and then heat treatment; washing and drying;

[0133] S3, soaking the obtained support in a cyclodextrin aqueous solution and shaking it, and then washing it with water and drying it;

[0134] S4, soaking the obtained support in ethanol and stirring, and drying after completion to obtain a modified support;

[0135] S5, the modified carrier is immersed in natural essential oil and shaken for adsorption to obtain a long-lasting fragrance mixture. The heat treatment in step S2 is performed at a temperature of 75° C. for 3 hours.

[0136] The washing in step S2 is performed with a 95 vol% ethanol aqueous solution.

[0137] The cyclodextrin in step S3 includes γ-cyclodextrin.

[0138] In the cyclodextrin aqueous solution in step S3, the content of cyclodextrin is 15 wt %.

[0139] The treatment temperature in step S3 is 50° C. and the time is 1.5 hours, and the temperature of the water used for washing is 60° C. The treatment temperature in step S4 is 35° C. and the time is 2 hours.

[0140] The adsorption in step S5 is carried out at room temperature for 48 hours.

[0141] After adsorption in step S5, excess essential oil is removed by centrifugal drying at a rotation speed of 3000 rpm for 15 minutes.

[0142] Comparative Example 6

[0143] The difference from Example 2 is that cyclodextrin and PVP treatment are not used.

[0144] S1. Clean and dry the porous particle carrier, and soak it in ethyl acetate;

[0145] S2, filtering, drying, and then heat-treating to solidify; after solidification, washing away free ethyl acetate and drying;

[0146] S3, soaking the obtained carrier in water for shaking treatment, and then drying after completion;

[0147] S4, soaking the obtained support in ethanol and stirring, and drying after completion to obtain a modified support;

[0148] S5, soaking the modified carrier in natural essential oil and shaking and adsorbing it to obtain a long-lasting fragrance fragrance mixture. The soaking in step S1 is carried out at room temperature for 24 hours.

[0149] The heat treatment curing in step S2 is performed at a temperature of 75° C. for 3 hours.

[0150] In step S2, free ethyl acetate is washed away with a 95 vol% ethanol aqueous solution.

[0151] The treatment temperature in step S3 is 50° C. and the treatment time is 1.5 h.

[0152] The treatment in step S4 was performed at a temperature of 35° C. for 2 h.

[0153] The adsorption in step S5 is carried out at room temperature for 48 hours.

[0154] After adsorption in step S5, excess essential oil is removed by centrifugal drying at a rotation speed of 3000 rpm for 15 minutes.

[0155] Blank control

[0156] The difference from Example 2 is that the porous silica gel particles are not subjected to any treatment and only step S5 is performed.

[0157] Effect detection:

[0158] The above examples and comparative examples each used bergamot essential oil as the natural essential oil to prepare fragrance mixtures and then tested for fragrance persistence. The results are shown in the table. Fragrance persistence was evaluated by combining the essential oil mass retention rate and the human judgment of fragrance. The calculation method is:

[0159] First, the carrier is weighed before the adsorption of natural essential oil, which is recorded as M0; the prepared fragrance mixture is weighed, which is recorded as M1; the fragrance mixture is weighed after being left to stand for a specific time in a constant temperature hot air environment at 37°C, which is recorded as M x ; The calculation formula of essential oil quality retention rate a is:

[0160]

[0161] Table 1 Essential oil retention rate

[0162]

[0163]

[0164] The aroma was judged manually. Examples 1 and 2 still maintained a strong aroma after 48 hours, while Comparative Examples 1, 3, and 5 had almost no obvious aroma after 24 hours. Comparative Examples 2, 4, and 6 and the blank control had a lighter aroma after 18 hours and no aroma after 24 hours.

[0165] The results show that using only commercially available porous silica gel particles as a carrier for adsorbing essential oils only resulted in a fragrance retention time of approximately 18 hours. A control experiment using only natural essential oils (a layer of essential oil was applied to the bottom of a culture dish, which was then left uncovered and placed under the same conditions as the above samples) revealed that the fragrance was gone after 4 hours. Ethyl acetate is primarily used for dissolution and penetration, and it may help subsequent modifiers better penetrate the pores of the porous silica gel carrier. The experimental results show that using ethyl acetate alone for modification did not effectively extend the fragrance retention time. This may be because ethyl acetate itself does not have the ability to form stable complexes with fragrance molecules, thus failing to significantly improve the sustained release of fragrances. PVP, a polymer compound with excellent dispersion stability and film-forming properties, is often used as a surface modifier. The results show that using PVP alone for modification did not extend the fragrance retention time. This may be because, while PVP improves the surface properties of the carrier, it does not directly interact with fragrance molecules and therefore does not significantly affect the release behavior of the fragrance. Cyclodextrin has a unique "hydrophilic on the outside, hydrophobic on the inside" structure, which can include different guest molecules to form stable inclusion complexes. Our experimental results show that the addition of cyclodextrin in Comparative Examples 1, 3, and 5 has a relatively significant contribution to the fragrance lasting time. The use of cyclodextrin modification alone can slightly extend the fragrance lasting time, indicating that inclusion complexes may be formed between cyclodextrin and fragrance molecules, thereby slowing the release rate of fragrance. At the same time, the effects of co-modification of ethyl acetate and cyclodextrin, and co-modification of ethyl acetate and PVP are similar to the effect of cyclodextrin modification alone, proving that the addition of ethyl acetate or PVP to cyclodextrin does not have a positive effect. On the contrary, ethyl acetate has a negative effect on the addition of cyclodextrin. We expect that this may be due to the formation of inclusion complexes between ethyl acetate and cyclodextrin, which occupies some of the sites where inclusion complexes are formed between cyclodextrin and fragrance molecules, thereby weakening the sustained release effect of cyclodextrin on fragrance, and this occupying effect is greater than the promoting effect of ethyl acetate itself on the dissolution and penetration of cyclodextrin. On this basis, the addition of PVP treatment creates a synergistic effect. This may be due to the PVP treatment step affecting the interaction between ethyl acetate and cyclodextrin, or the surface modification effect of PVP is more effective in the presence of ethyl acetate and cyclodextrin. In short, the fragrance duration of the resulting fragrance mixture was significantly extended after the carrier was treated with ethyl acetate, cyclodextrin, and PVP in sequence.

[0166] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

[0167] The above description of the present invention and its embodiments is non-limiting and only illustrates one embodiment of the present invention. The actual application is not limited thereto. In short, if a person skilled in the art is inspired by the above description and, without departing from the purpose of the present invention, devises methods and embodiments similar to the technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A long-lasting fragrance fragrance mixture, characterized by: The invention comprises natural essential oil and a modified carrier; wherein the modified carrier is a porous particle carrier which is sequentially treated with ethyl acetate, cyclodextrin and polyvinylpyrrolidone (PVP).

2. The long-lasting fragrance flavor mixture according to claim 1, characterized in that: The natural essential oils include one or more of basil essential oil, bergamot essential oil, lemon essential oil, peppermint essential oil, tea tree essential oil, rosemary essential oil, eucalyptus essential oil, black pepper essential oil, citrus essential oil, geranium essential oil, lavender essential oil, rose essential oil, juniper essential oil, patchouli essential oil, vetiver essential oil, sandalwood essential oil, benzoin essential oil, and cinnamon essential oil.

3. A method for preparing the long-lasting fragrance flavor mixture according to claim 1 or 2, characterized in that: The following steps are involved: S1. Clean and dry the porous particle carrier, and soak it in ethyl acetate; S2, filtering, drying, and then heat-treating to solidify; after solidification, washing away free ethyl acetate and drying; S3, soaking the obtained support in a cyclodextrin aqueous solution and shaking it, and then washing it with water and drying it; S4, soaking the obtained support in an ethanol solution of polyvinyl pyrrolidone and stirring, and then washing and drying to obtain a modified support; S5. The modified carrier absorbs the natural essential oil to obtain a long-lasting fragrance mixture.

4. The method for preparing the long-lasting fragrance flavor mixture according to claim 3, wherein: The porous particle carrier in step S1 is porous silica gel particles with a particle size of 5-10 μm, a pore size of 30-50 nm, and a specific surface area of ​​100-500 m 2 / g; the soaking in step S1 is carried out at room temperature for 18-24h.

5. The method for preparing the long-lasting fragrance flavor mixture according to claim 3, wherein: The heat treatment curing in step S2 is performed at a temperature of 60-75° C. for 2-3 hours. The free ethyl acetate is washed away in step S2 by using an 85-95 vol% ethanol aqueous solution.

6. The method for preparing the long-lasting fragrance flavor mixture according to claim 3, wherein: The cyclodextrin in step S3 includes β-cyclodextrin or γ-cyclodextrin; the content of cyclodextrin in the cyclodextrin aqueous solution in step S3 is 10-15wt%.

7. The method for preparing the long-lasting fragrance flavor mixture according to claim 3, wherein: The treatment temperature in step S3 is 35-50°C and the treatment time is 1-1.5 hours; the temperature of the water used for cleaning is 50-60°C.

8. The method for preparing the long-lasting fragrance flavor mixture according to claim 3, wherein: In the ethanol solution of polyvinyl pyrrolidone in step S4, the content of polyvinyl pyrrolidone is 0.1-0.15 g / mL.

9. The method for preparing the long-lasting fragrance flavor mixture according to claim 3, wherein: The treatment in step S4 is performed at a temperature of 30-35° C. for 1.5-2 h; and anhydrous ethanol is used for the cleaning.

10. The method for preparing the long-lasting fragrance flavor mixture according to claim 3, characterized in that: The adsorption in step S5 is carried out at room temperature for 24-48 hours.

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