Mogroside purification method and mogroside compound sweetening agent preparation method

Abstract

The invention discloses a purification method of mogroside and a preparation method of a mogroside compound sweetening agent. According to the present invention, the phosphatidyl ethanolamine (PE) is used to purify the mogroside, the PE and the mogroside are subjected to self-assembly to form the micelle, the micelle is purified through the membrane filtration technology, the micelle is decomposed, the PE and the mogroside are separated by using the similar compatibility principle so as to obtain the purified mogroside, the purification method is simple and convenient to operate, the operation is simple, the operation is easy, and the purification cost is low. The prepared mogroside is high in purity and suitable for large-scale production, PE can be recycled, and the cost is reduced. The mogroside compound sweetening agent comprises the following components: mogroside, neohesperidin dihydrochalcone, polydextrose, L-arabinose, potassium citrate and malic acid, and is prepared by mixing the components according to a scientific proportion and process. According to the preparation method disclosed by the invention, mogroside and neohesperidin dihydrochalcone are self-assembled to form a micelle structure, so that the synergistic effect of reducing blood sugar can be enhanced, the mouth feel and flavor of the compound sweetening agent are improved, the sweet taste is increased, the bitter taste and astringent taste are reduced, and the acceptability of consumers on the taste of the compound sweetening agent is improved.

Description

Technical Field

[0001] The present invention relates to the technical fields of extraction and purification and food additives, and particularly to a method for purifying mogroside and a method for preparing a compound sweetener of mogroside. Background Art

[0002] At present, most of the mogrosides on the market have low purity, concentrated in 25-50%. The low-purity mogrosides have defects such as reduced taste, biological activity, and increased side effects, which limit the application of low-purity mogrosides in the fields of food, medicine, health products, etc. Therefore, how to achieve large-scale industrial production of high-purity mogroside is a future development direction.

[0003] In the traditional process for purifying mogroside, macroporous resins are used, including macroporous adsorption resins and ion exchange resins. Organic solvents or strongly corrosive chemical reagents are used in the chromatography process. These solvents or reagents have potential hazards to the environment and human health, and specific equipment is required. The operation is relatively complex, and it is urgent to improve and innovate the mogroside purification process.

[0004] Mogroside is a natural sweet component extracted from Siraitia grosvenorii. Its sweetness is 240 to 300 times that of sucrose, and its calorie is only 1 / 50 of sucrose. It also has various pharmacological activities such as antioxidant, anti-inflammatory, hypoglycemic, liver protection, expectorant and cough-relieving effects. Against the background of the global advocacy of green and healthy life and the increasing incidence of diabetes, mogroside, as a non-sugar, high-sweetness, low-calorie, safe and non-toxic natural sweetener, has broad development prospects.

[0005] Compound sweeteners refer to a type of sweeteners that combine two or more natural or synthetic sweeteners to enhance sweetness and flavor and mask bad tastes. This compounding is not simply mixing various sweetener monomers together, but a technical compounding that combines the synergistic effects between various sweeteners and the physiological characteristics of taste. Compounding mogroside with other sweeteners can comprehensively improve the sweetening effect, enhance the quality of sweeteners, and reduce costs, and has wide applications in the fields of beverages, ice creams, baked foods, etc. In view of the above problems, improvements are proposed. Summary of the Invention

[0006] The present invention provides a method for purifying mogroside, which uses phosphatidylethanolamine (PE) to purify mogroside. First, PE and mogroside self-assemble to form micelles, impurities are removed by membrane filtration, the micelles are purified, and then citrus essential oil is used to separate PE and mogroside, thereby obtaining purified mogroside. The purification method of the present invention is simple to operate and suitable for large-scale production.

[0007] The technical solution of the present invention is realized as follows:

[0008] A method for purifying mogroside, comprising the following steps:

[0009] (1) Add an appropriate amount of pure water to the cleaned, peeled, and pitted Siraitia grosvenorii, soak for 12 - 24 h, then pour into a blender and stir for 30 min, filter to remove solid impurities, and obtain an aqueous solution of the crude extract of mogroside.

[0010] (2) Under magnetic stirring, slowly drop the aqueous solution of the crude extract of mogroside obtained in step (1) into an absolute ethanol solution of phosphatidylethanolamine (PE). The volume ratio of the aqueous solution of the crude extract of mogroside to the PE ethanol solution is 1:2. Stir at 37 °C for 2 h. After completely volatilizing the ethanol solution, centrifuge at 12000 rpm / min for 10 min. The supernatant contains the micelles formed by the self-assembly of mogroside and PE.

[0011] (3) Pass the solution containing mogroside-PE micelles obtained in step (2) through an ultrafiltration membrane with a molecular weight cut-off of 2000 Da. During the filtration process, small molecule impurities and unassembled micelle molecules in the solution can pass through the ultrafiltration membrane, while the macromolecular micelles formed by the self-assembly of mogroside and PE cannot pass through the ultrafiltration membrane and enter the retentate, thereby realizing the purification and concentration of mogroside-PE micelles.

[0012] (4) Add purified citrus essential oil to the retentate of mogroside-PE micelles obtained in step (3) according to a volume ratio of 1:(1 - 2), stir thoroughly at 100 - 130 °C for 1 h to decompose the self-assembled micelles. After decomposition, the mogroside produced enters the aqueous phase and the PE enters the oil phase. After standing for 20 min, separate the oil phase and the aqueous phase, namely realize the separation of mogroside and PE, and collect the aqueous solution of mogroside.

[0013] (5) Perform spray drying on the aqueous solution of mogroside collected in step (4). First, raise the temperature of the spray fluidized bed drying chamber to 160 °C, then spray the aqueous solution of mogroside into the drying chamber through a pneumatic atomizer (also known as a nozzle), and control the outlet temperature to be 70 - 80 °C to obtain mogroside powder for storage and standby.

[0014] The further technical problem to be solved by the present invention is to provide a mogroside compound sweetener and its preparation method.

[0015] The mogroside compound sweetener of the present invention has a raw material composition including mogroside, neohesperidin dihydrochalcone, polydextrose, L-arabinose, potassium citrate, and malic acid.

[0016] In the present invention, the mogroside is a high-quality mogroside prepared by the purification method of the present invention. The content of mogroside V reaches 90%-95%. The higher the purity, the fewer bitter impurities it contains, and the better the flavor of the prepared compound sweetener.

[0017] In the present invention, neohesperidin dihydrochalcone is a safe, non-toxic and low-calorie sweetener with a sweetness 1500 to 1800 times that of sucrose. It can be used as a sugar substitute in healthy foods and has flavoring properties such as sweetening, enhancing flavor and masking bitterness. It also has physiological activities such as hypoglycemic, antioxidant and cholesterol-lowering effects. When used in combination with mogroside, it can exert a synergistic effect.

[0018] In the present invention, polydextrose is a water-soluble dietary fiber with low calories and is suitable for diabetic patients. At the same time, it is also an effective prebiotic and has functions such as improving gastrointestinal function and promoting the digestion and absorption of nutrients.

[0019] The technical solution adopted in the present invention is a preparation method of a mogroside compound sweetener, which includes the following steps:

[0020] S1, Preparation of mogroside micelles

[0021] S1-1, Slowly drop the mogroside ethanol solution with a concentration of 1.0 mg / mL into the neohesperidin dihydrochalcone aqueous solution with a concentration of 1.5 mg / mL, stir in a water bath at 37°C for 2 h, completely evaporate the ethanol, and then centrifuge at 12000 rpm / min for 10 min. The supernatant collected is the micelles formed by the self-assembly of mogroside and neohesperidin dihydrochalcone.

[0022] S1-2, Ultrafiltration treatment is carried out on the mogroside-neohesperidin dihydrochalcone micelles obtained in step S1-1, so that the solution passes through an ultrafiltration membrane with a molecular weight cut-off of 1500 Da to obtain a purified mogroside-neohesperidin dihydrochalcone micelle solution.

[0023] S1-3, Put the mogroside-neohesperidin dihydrochalcone micelle solution obtained in step S1-2 into a spray fluidized bed drying chamber for spray drying. The drying chamber is preheated to 160°C to obtain mogroside-neohesperidin dihydrochalcone micelle powder.

[0024] S2, Preparation of co-crystal material

[0025] Mix L-arabinose, potassium citrate and malic acid in a certain mass ratio, put them into a crystallization tank, add an appropriate amount of pure water to dissolve, continuously stir and raise the temperature in the crystallization tank to 70°C, then gradually cool down to 25°C, and finally dry the formed crystals to obtain the co-crystal material.

[0026] S3, Preparation of compound sweetener

[0027] S3-1, Feed the eutectic material prepared in step S2 into a spray granulation fluidized bed to make it in a fluidized state, and then spray a polydextrose aqueous solution (prepared by dissolving polydextrose particles in pure water according to a certain mass ratio) onto the surface of the eutectic material through a nozzle. After repeated coating and drying, solid particles A are obtained.

[0028] S3-2, Dissolve the mogroside-neohesperidin dihydrochalcone micelle powder prepared in step S1 in pure water according to a certain mass ratio, and make the micelle solution spray onto the surface of the circulating solid particles A through a nozzle. After repeated coating and drying, the mogroside compound sweetener is obtained.

[0029] Further, in step S1, the volume ratio of the mogroside ethanol solution to the neohesperidin dihydrochalcone aqueous solution is 1:(1 - 2).

[0030] Further, in step S2, L-arabinose, potassium citrate, and malic acid are mixed in a mass ratio of (50 - 60):(0.5 - 1.5):(3 - 8) to form the eutectic material.

[0031] Further, in step S2, the cooling rate is 10 - 15 °C per hour.

[0032] Further, in step S3, the mass ratio of the eutectic material, polydextrose, and the mogroside-neohesperidin dihydrochalcone micelle is (100 - 120):(2 - 6):(0.1 - 1.5).

[0033] Compared with the prior art, the beneficial effects or advantages of the present invention are mainly reflected in the following aspects:

[0034] The present invention innovatively uses phosphatidylinositol (PE) to purify mogroside, enabling PE and mogroside to self-assemble into micelles. The formed micelles are separated from other small molecule impurities through membrane filtration technology to obtain purified PE-mogroside micelles. Then, the micelles are decomposed by heating and stirring. According to the principle of similar compatibility, natural citrus essential oil is added to separate PE and mogroside, thereby obtaining purified mogroside. This purification method does not require specific equipment, is easy to operate, does not involve chemical reagents during the purification process, will not harm human health or cause environmental pollution, the prepared mogroside has high purity and good quality, and phosphatidylinositol (PE) can be recycled, saving resources and reducing costs.

[0035] In the preparation method of the compound sweetener of the present invention, mogroside and neohesperidin dihydrochalcone are both sweeteners with high sweetness, low calorie and hypoglycemic function. The two form micelles with stable structure through non-covalent interaction, which is beneficial to improve the solubility and bioavailability of the two sweeteners, play a synergistic hypoglycemic effect, and at the same time can improve the taste and flavor of the compound sweetener, increase sweetness, reduce bitterness and astringency, and improve the acceptability of consumers to the taste of the compound sweetener.

[0036] In the preparation method of the compound sweetener of the present invention, L-arabinose, potassium citrate and malic acid are mixed to prepare a co-crystal.

[0037] The compound sweetener of the present invention has low calorie, higher sweetness than sucrose, pure and lasting flavor, and has biological activities such as hypoglycemic and antioxidant. The raw materials used are natural, safe and non-toxic, meeting the needs of green and healthy life, and can also be used as a substitute for sucrose for diabetic patients. Detailed implementation mode

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0039] Embodiment

[0040] This embodiment provides a method for purifying mogroside. The specific operation steps are as follows:

[0041] (1) Add an appropriate amount of pure water to the cleaned, peeled and pitted Momordica grosvenori, soak for 15 h, pour it into a blender and stir for 30 min, filter to remove solid impurities, and obtain an aqueous solution of the crude extract of mogroside.

[0042] (2) Under magnetic stirring, slowly drop the aqueous solution of the crude extract of mogroside obtained in step (1) into an absolute ethanol solution of phosphatidylethanolamine (PE). The volume ratio of the aqueous solution of the crude extract of mogroside to the PE ethanol solution is 1:2. Stir at 37 °C for 2 h. After completely evaporating the ethanol solution, centrifuge at 12000 rpm / min for 10 min. The supernatant obtained contains micelles formed by self-assembly of mogroside and PE.

[0043] (3) Pass the solution containing mogroside-PE micelles obtained in step (2) through an ultrafiltration membrane with a molecular weight cut-off of 2000 Da. During the filtration process, small molecule impurities and unassembled micelle molecules in the solution can pass through the ultrafiltration membrane, while the large molecule micelles formed by the self-assembly of mogroside and PE cannot pass through the ultrafiltration membrane and enter the retentate, thereby achieving the purification and concentration of mogroside-PE micelles.

[0044] (4) Add purified citrus essential oil to the mogroside-PE micelle retentate obtained in step (3) at a volume ratio of 1:1, and stir well at 110 °C for 1 h to decompose the self-assembled micelles. After decomposition, the mogroside enters the aqueous phase and the PE enters the oil phase. After standing for 20 min, separate the oil phase and the aqueous phase, namely, separate mogroside and PE, and collect the mogroside aqueous solution.

[0045] (5) Perform spray drying on the mogroside aqueous solution collected in step (4). First, raise the temperature of the spray fluidized bed drying chamber to 160 °C, and then spray the mogroside aqueous solution into the drying chamber through a pneumatic atomizer (also known as a nozzle), and control the outlet temperature to be 70 °C to obtain mogroside powder for storage and standby.

[0046] Example 2

[0047] In this example, the content of mogroside V in the purified mogroside of the present invention was detected, and at the same time, the content of mogroside V in the mogroside purified by macroporous adsorption resin was measured as a control to evaluate the effect of the mogroside purification method of the present invention. Take 2.5 g of the mogroside sample, add methanol to make up to 10 mL, shake well, absorb 0.1 mL of the sample solution, evaporate the solvent, add 0.3 mL of 5% vanillin-glacial acetic acid solution and 1.2 mL of perchloric acid, heat in a water bath at 60 °C for 20 min, cool in an ice bath, add 5 mL of glacial acetic acid and shake well, measure the absorbance at a wavelength of 590 nm, and calculate the concentration of mogroside V in the sample according to the prepared standard curve, thereby calculating the content (%) of mogroside V in the sample.

[0048] The test results are shown in Table 1. In this test, the content of mogroside V in the mogroside purified by two different methods was measured. It can be seen that the content of mogroside V in the mogroside prepared by the purification method of the present invention is higher than that of the traditional macroporous adsorption resin purification method.

[0049] Table 1

[0050]

[0051] Example 3

[0052] This embodiment provides a preparation method of mogroside compound sweetener, and the specific operation steps are as follows:

[0053] S1. Preparation of mogroside micelles

[0054] S1-1. Slowly drop the ethanol solution of mogroside with a concentration of 1.0 mg / mL into the aqueous solution of neohesperidin dihydrochalcone with a concentration of 1.5 mg / mL, and the volume ratio of the two is 1:1. Stir in a water bath at 37 °C for 2 h. After completely evaporating the ethanol, centrifuge at 12000 rpm / min for 10 min, and collect the supernatant, which is the micelles formed by the self-assembly of mogroside and neohesperidin dihydrochalcone.

[0055] S1-2. Ultrafilter the mogroside-neohesperidin dihydrochalcone micelles obtained in step S1-1, and make the solution pass through an ultrafiltration membrane with a molecular weight cut-off of 1500 Da to obtain a purified mogroside-neohesperidin dihydrochalcone micelle solution.

[0056] S1-3. Put the mogroside-neohesperidin dihydrochalcone micelle solution obtained in step S1-2 into a spray fluidized bed drying chamber for spray drying. The drying chamber is preheated to 160 °C to obtain mogroside-neohesperidin dihydrochalcone micelle powder.

[0057] S2. Preparation of co-crystal material

[0058] Mix L-arabinose, potassium citrate, and malic acid according to a mass ratio of 60:1:6, put them into a crystallization tank, add an appropriate amount of pure water to dissolve, continuously stir and raise the temperature in the crystallization tank to 70 °C, then gradually cool it to 25 °C at a cooling rate of 10 °C per hour, and finally dry the formed crystals to obtain the co-crystal material.

[0059] S3. Preparation of compound sweetener

[0060] S3-1. Put the co-crystal material prepared in step S2 into a spray granulation fluidized bed to make it in a fluidized state, and then spray the aqueous solution of polydextrose (prepared by dissolving polydextrose particles in pure water according to a certain mass ratio) onto the surface of the co-crystal material through a nozzle. After repeated coating and drying, solid particles A are obtained.

[0061] S3-2. Dissolve the mogroside-neohesperidin dihydrochalcone micelle powder prepared in step S1 in pure water according to a certain mass ratio, and make the micelle solution spray onto the surface of the circulating solid particles A through a nozzle. After repeated coating and drying, the mogroside compound sweetener is obtained. The mass ratio of the co-crystal material, polydextrose, and mogroside-neohesperidin dihydrochalcone micelles is 120:5:1.

[0062] Example 4

[0063] This embodiment provides a preparation method of mogroside compound sweetener, and the specific operation steps are as follows:

[0064] S1, Preparation of mogroside micelles

[0065] S1-1, Slowly drop the ethanol solution of mogroside with a concentration of 1.0 mg / mL into the aqueous solution of neohesperidin dihydrochalcone with a concentration of 1.5 mg / mL, with the volume ratio of the two being 1:2. Stir in a water bath at 37 °C for 2 h. After completely evaporating the ethanol, centrifuge at 12000 rpm / min for 10 min, and collect the supernatant, which is the micelles formed by the self-assembly of mogroside and neohesperidin dihydrochalcone.

[0066] S1-2, Ultrafilter the mogroside-neohesperidin dihydrochalcone micelles obtained in step S1-1, make the solution pass through an ultrafiltration membrane with a molecular weight cut-off of 1500 Da, and obtain a purified mogroside-neohesperidin dihydrochalcone micelle solution.

[0067] S1-3, Put the mogroside-neohesperidin dihydrochalcone micelle solution obtained in step S1-2 into a spray fluidized bed drying chamber for spray drying. Preheat the drying chamber to 160 °C to obtain mogroside-neohesperidin dihydrochalcone micelle powder.

[0068] S2, Preparation of co-crystal material

[0069] Mix L-arabinose, potassium citrate, and malic acid in a mass ratio of 50:1:3, put them into a crystallization tank, add an appropriate amount of pure water to dissolve, continuously stir and raise the temperature in the crystallization tank to 70 °C, then gradually cool it to 25 °C at a cooling rate of 10 °C per hour, and finally dry the formed crystals to obtain the co-crystal material.

[0070] S3, Preparation of compound sweetener

[0071] S3-1, Put the co-crystal material prepared in step S2 into a spray granulation fluidized bed to make it in a fluidized state, and then spray the aqueous solution of polydextrose (prepared by dissolving polydextrose particles in pure water according to a certain mass ratio) onto the surface of the co-crystal material through a nozzle. After repeated coating and drying, obtain solid particles A.

[0072] S3-2, Dissolve the mogroside-neohesperidin dihydrochalcone micelle powder prepared in step S1 in pure water according to a certain mass ratio, make the micelle solution spray onto the surface of the circulating solid particles A through a nozzle, and after repeated coating and drying, obtain the mogroside compound sweetener. The mass ratio of the co-crystal material, polydextrose, and mogroside-neohesperidin dihydrochalcone micelles is 100:2:0.3.

[0073] Example 5

[0074] In this example, the flavor of the mogroside compound sweetener prepared in Examples 3 - 4 was evaluated. The mogroside compound sweeteners prepared in Example 3 and Example 4 were respectively formulated into aqueous solutions with a concentration of 5% (wt / wt). At the same time, an aqueous sucrose solution with a concentration of 5% and an aqueous mogroside solution were prepared as controls (the mogroside used was the mogroside powder purified and extracted by the method of the present invention). Twenty testers, with an equal number of males and females, were selected to conduct a sensory evaluation of the flavor of the compound sweetener group and the control group. The evaluation result was the average score of the 20 testers, and the flavor of the 5% aqueous sucrose solution was used as the standard.

[0075] The test results are shown in Table 2. The sweetness of the mogroside compound sweeteners prepared in Example 3 and Example 4 is higher than that of sucrose and mogroside. The bitterness and astringency are reduced compared with mogroside alone, and the aftertaste maintenance effect is better. Generally speaking, the mogroside compound sweetener of the present invention has a better flavor compared with sucrose and mogroside. Among them, the comprehensive flavor performance of the compound sweetener in Example 3 is the best, and the proportion of the raw material components in Example 3 is the preferred proportion.

[0076] Table 2

[0077]

[0078] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for purifying mogroside, characterized in that, It includes the following steps: (1) Add an appropriate amount of pure water to the cleaned, peeled, and pitted Momordica grosvenori fruits. After soaking for 12 - 24 h, pour them into a blender and stir for 30 min. Filter to remove solid impurities to obtain an aqueous solution of crude extract of mogrosides; (2) Under magnetic stirring, slowly drip the aqueous solution of crude extract of mogrosides obtained in step (1) into an absolute ethanol solution of phosphatidylethanolamine (PE). The volume ratio of the aqueous solution of crude extract of mogrosides to the PE ethanol solution is 1:

2. Stir at 37 °C for 2 h. After completely evaporating the ethanol solution, centrifuge at 12000 rpm / min for 10 min. The supernatant obtained contains micelles formed by self-assembly of mogrosides and PE; (3) Pass the solution containing mogroside-PE micelles obtained in step (2) through an ultrafiltration membrane with a molecular weight cut-off of 2000 Da. During the filtration process, small molecule impurities and molecules of unassembled micelles in the solution can pass through the ultrafiltration membrane, while the large molecule micelles formed by self-assembly of mogrosides and PE cannot pass through the ultrafiltration membrane and enter the retentate, thus realizing the purification and concentration of mogroside-PE micelles; (4) Add purified citrus essential oil to the retentate of mogroside-PE micelles obtained in step (3) according to a volume ratio of 1:(1 - 2). Stir thoroughly at 100 - 130 °C for 1 h to decompose the self-assembled micelles. The mogrosides produced after decomposition enter the aqueous phase, and PE enters the oil phase. After standing for 20 min, separate the oil phase and the aqueous phase, namely realizing the separation of mogrosides and PE, and collect the aqueous solution of mogrosides; (5) Perform spray drying on the aqueous solution of mogrosides collected in step (4). First, raise the temperature of the spray fluidized bed drying chamber to 160 °C, and then spray the aqueous solution of mogrosides into the drying chamber through a pneumatic atomizer (also known as a nozzle). Control the outlet temperature at 70 - 80 °C to obtain mogroside powder for storage and standby.

2. A preparation method of mogroside compound sweetener, characterized in that, It includes the following steps: S1. Preparation of mogroside micelles S1-1. Slowly drip an ethanol solution of mogrosides with a concentration of 1.0 mg / mL into an aqueous solution of neohesperidin dihydrochalcone with a concentration of 1.5 mg / mL. Stir in a water bath at 37 °C for 2 h. After completely evaporating the ethanol, centrifuge at 12000 rpm / min for 10 min. Collect the supernatant, which is the micelles formed by self-assembly of mogrosides and neohesperidin dihydrochalcone; S1-2. Perform ultrafiltration treatment on the mogroside-neohesperidin dihydrochalcone micelles obtained in step S1-1, and make the solution pass through an ultrafiltration membrane with a molecular weight cut-off of 1500 Da to obtain a purified solution of mogroside-neohesperidin dihydrochalcone micelles; S1-3. Put the solution of mogroside-neohesperidin dihydrochalcone micelles obtained in step S1-2 into a spray fluidized bed drying chamber for spray drying. Preheat the drying chamber to 160 °C to obtain mogroside-neohesperidin dihydrochalcone micelle powder. S2. Preparation of co-crystal material Mix L-arabinose, potassium citrate, and malic acid in a certain mass ratio, put them into a crystallization tank, add an appropriate amount of purified water to dissolve, continuously stir and raise the temperature in the crystallization tank to 70 °C, then gradually cool it to 25 °C, and finally dry the formed crystals to obtain the co-crystal material; S3. Preparation of compound sweetener S3-1. Put the co-crystal material prepared in step S2 into a spray granulation fluidized bed to make it in a fluidized state, and then spray the polydextrose aqueous solution (prepared by dissolving polydextrose particles in purified water in a certain mass ratio) onto the surface of the co-crystal material through a nozzle. After repeated coating and drying, solid particles A are obtained; S3-2. Dissolve the mogroside-neohesperidin dihydrochalcone micelle powder prepared in step S1 in purified water in a certain mass ratio, and make the micelle solution spray onto the surface of the circulating solid particles A through a nozzle. After repeated coating and drying, the mogroside compound sweetener is obtained.

3. The preparation method according to claim 2, wherein In step S1, the volume ratio of the mogroside ethanol solution to the neohesperidin dihydrochalcone aqueous solution is 1:(1 - 2).

4. The preparation method according to claim 2, characterized in that, L-arabinose, potassium citrate, and malic acid are mixed in a mass ratio of (50 - 60):(0.5 - 1.5):(3 - 8) to form the co-crystal material.

5. The preparation method according to claim 2, characterized in that, In step S2, the cooling rate is 10 - 15 °C per hour.

6. The preparation method according to claim 2, characterized in that, In step S3, the mass ratio of the co-crystal material, polydextrose, and the mogroside-neohesperidin dihydrochalcone micelle is (100 - 120):(2 - 6):(0.1 - 1.5).

7. The preparation method according to claim 6, characterized in that, In step S3, the mass ratio of the co-crystal material, polydextrose, and the mogroside-neohesperidin dihydrochalcone micelle is 120:5:

1.

8. A mogroside compound sweetener prepared by the preparation method according to any one of claims 2 - 7.

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