Preparation method and application of low-irritation rhizoma polygonati powder
Through the method of airflow expansion and high pressure combined with mixed bacteria fermentation, the tedious problems of fresh Polygonum multiflorum and traditional preparation are solved, and the low irritation and high activity of Polygonum multiflorum is achieved, simplifying the processing process and reducing costs.
Patent Information
- Application Number
- CN202510343181.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-21
- Publication Date
- 2025-07-15
AI Technical Summary
Fresh Polygonatum is irritating, traditional preparation methods are cumbersome, and the parameters are unclear, making it difficult to unify production standards.
The method of airflow puffing combined with high-pressure treatment and mixed bacteria fermentation is adopted, including airflow puffing of polygonatum slices, autoclaving, adding mixed bacterial solution for solid fermentation, and finally drying and crushing.
Significantly reduce the irritability of Polygonatum, simplify the processing process, reduce costs, improve the edible and medicinal properties of Polygonatum, and retain the active ingredients of polysaccharides.
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Abstract
Description
Technical Field
[0001] The present invention belongs to the field of development of both medicine and food, and specifically relates to a preparation method and application of low-stimulus polygonatum sibiricum powder. Background Art
[0002] Polygonatum sibiricum tastes sweet and has a neutral nature, and belongs to the lung, spleen, and kidney meridians. It has the effects of replenishing qi and nourishing yin, moistening the lungs and invigorating the spleen, and nourishing the kidneys and filling essence. Modern pharmacological research shows that polygonatum sibiricum has various pharmacological effects such as hypoglycemic, antioxidant, hypolipidemic, anti-inflammatory and antibacterial, anti-aging, immune regulation, and anti-tumor. Active ingredients such as polygonatum polysaccharide endow polygonatum sibiricum with rich pharmacological activities.
[0003] Fresh raw polygonatum sibiricum has a pungent taste. After consumption, the tongue becomes numb, and there is an obvious discomfort in the throat. The skin that has come into contact with raw polygonatum sibiricum or its juice will have an itchy feeling, and it is difficult to relieve. Therefore, polygonatum sibiricum is usually processed by the traditional method of "nine steaming and nine sunning" to remove its irritation. After processing, polygonatum sibiricum is soft, moist, sticky, and has a slight aroma of wine. Compared with raw polygonatum sibiricum, polygonatum sibiricum processed by nine steaming and nine sunning is more suitable for consumption or medicinal use. However, this traditional and complex processing method requires multiple steps, including washing, steaming, and sunning, repeated nine times, to achieve the effect of reducing the irritation of raw polygonatum sibiricum and enhancing its curative effect. This processing process is relatively cumbersome, consumes too many resources, and there are no clear process parameters in actual operation, making it difficult to unify the production standards.
[0004] The irritation intensity of polygonatum sibiricum is greatly affected by the content of saponin components and volatile components inside polygonatum sibiricum, as well as the morphology and content of calcium oxalate. Using air puffing can accelerate the rupture of plant cell walls, making it easier for the irritating components in polygonatum sibiricum slices to be released, and also having a certain impact on volatile components and the morphology of calcium oxalate; high-pressure treatment is an effective processing method to improve the taste of polygonatum sibiricum, which helps to destroy the irritating components while making the texture of polygonatum sibiricum softer, sweeter, and more glutinous. At the same time, fermentation treatment can cause the transformation of the components of active substances, improve the biological activity of polygonatum sibiricum and reduce its irritation. In addition, compared with the traditional method of nine steaming and nine sunning, the combination of high-pressure treatment and mixed bacteria fermentation treatment can also shorten the production cycle, reduce production costs, and is conducive to the promotion of products. The combination of the two plays a synergistic role and has important practical application value.
[0005] Aiming at the problems that the current fresh polygonatum sibiricum has irritation and the processing technology of processed polygonatum sibiricum is cumbersome and the parameters are unclear, overcoming the obstacles of the prior art, the present invention provides a preparation method and application of low-stimulus polygonatum sibiricum powder. Summary of the Invention
[0006] The object of the present invention is to overcome the above deficiencies existing in the prior art, and to synergistically utilize the means of pressurization combined with mixed bacteria fermentation to reduce the content of irritating components in polygonatum, while improving the texture and taste of raw polygonatum, reducing costs, and enhancing the activity and application value.
[0007] The object of the present invention is achieved by at least one of the following technical solutions.
[0008] A preparation method of low-irritation polygonatum powder of the present invention includes the following steps:
[0009] (1) Clean, slice and dry fresh polygonatum until the moisture content is 10-20%.
[0010] (2) Put the raw polygonatum slices obtained in step (1) into a traditional air puffing machine, start puffing after heating.
[0011] (3) Add a certain proportion of clear water to moisten the polygonatum slices obtained in step (2), place them in a high-pressure sterilizer, and perform high-pressure treatment.
[0012] (4) Dry the polygonatum slices obtained in step (3) in an oven.
[0013] (5) In the polygonatum slices obtained in step (4), under sterile conditions, according to a certain solid-liquid ratio, add a mixed bacterial solution of two or more microorganisms, perform solid-state synergistic fermentation, and perform constant-temperature cultivation and ventilation fermentation.
[0014] (6) Dry the polygonatum slices obtained in step (5) in an oven.
[0015] (7) Crush and sieve the polygonatum slices in step (6) to obtain polygonatum powder.
[0016] Preferably, in step (1), the size of the fresh polygonatum slices is 4-6 cm, the slice thickness is 3-5 mm, the drying method is air drying or hot air drying, the drying temperature is 60-70 °C, the drying time is 1-3 days, and the moisture content in the material is dried to 10-20%.
[0017] Preferably, in step (2), the puffing treatment is to put the polygonatum slices into a traditional air puffing machine, start puffing after heating for 5-10 min, and the pressure is 0.9-1.2 MPa.
[0018] Preferably, in step (3), the mass ratio of the dried slices to clear water is 1:1-1:2, and the time for moistening with clear water is 1-2 h.
[0019] Preferably, in step (3), the pressure of the high-pressure treatment is 0.10-0.15 MPa, and the time of the high-pressure treatment is 25-35 minutes.
[0020] Preferably, in step (4), the drying temperature is 60-70°C and the drying time is 1-3 days.
[0021] Preferably, in step (5), the inoculated microorganisms are a mixed bacterial solution of Lactobacillus plantarum, Lactobacillus paracasei, and Lactobacillus acidophilus, with a mixing ratio of 1-2:1-2:1-2 (v / v / v), preferably 1:1.5:1 (v / v / v). The material-liquid ratio of the polygonatum sibiricum material to the bacterial solution is 1:1-2 (g / mL). The temperature for constant-temperature cultivation is 30-40°C, and the cultivation time is 5-9 days.
[0022] Preferably, in step (6), the drying temperature is 60-70°C and the drying time is 1-3 days.
[0023] Preferably, in step (7), the polygonatum sibiricum is passed through a Chinese medicine grinder and then sieved through a 40-mesh sieve to obtain polygonatum sibiricum powder.
[0024] The polygonatum sibiricum tablets obtained by the present invention can be soaked in wine, or ground into powder to obtain polygonatum sibiricum powder. Other ingredients can be added or not added to the extract of the polygonatum sibiricum powder, and it can be developed into products such as polygonatum sibiricum beverages, yogurt, biscuits, chewable tablets, and crispy chips.
[0025] Compared with the prior art, the present invention has the following advantages and technical effects:
[0026] First, through the airflow puffing pretreatment in step (2), the rupture of plant cell walls can be accelerated, making the irritating components in the polygonatum sibiricum slices easier to release, and having a certain impact on the volatile components and the morphology of calcium oxalate, thereby reducing the irritation of polygonatum sibiricum.
[0027] Second, compared with the traditional "nine steaming and nine sunning" processing method, through the high-pressure treatment in step (3), not only the processing flow is simplified, the cost is saved, but also the loss of polysaccharides is reduced, which is beneficial to enhancing the physiological activity and medicinal value of polygonatum sibiricum.
[0028] Third, introducing the solid-state fermentation technology of microorganisms into the processing process of polygonatum sibiricum can effectively reduce the pungency and irritation of polygonatum sibiricum, and can also simplify the processing technology and save energy consumption. This helps to reduce production costs and improve efficiency.
[0029] Fourth, the polygonatum sibiricum tablets after mixed fermentation of multiple strains in step (5) have lower irritation than the unfermented and single-strain fermented polygonatum sibiricum samples.
[0030] Fifth, through the mutual cooperation of the above means, the irritation in the fresh polygonatum sibiricum raw slices is finally reduced to 10%-20% of the original, greatly increasing the edibility and medicinal value of polygonatum sibiricum, and the flavor is more abundant. Specific embodiments
[0031] The present invention will be further elaborated in detail below in conjunction with specific embodiments. The embodiments are only used to explain the present invention and are not intended to limit the scope of the present invention. Unless otherwise specified, the test methods used in the following embodiments are all conventional methods; the materials, reagents, etc. used, unless otherwise specified, are reagents and materials that can be obtained from commercial channels.
[0032] Example 1
[0033] (1) Select fresh Polygonatum kingianum, wash it clean, cut it into thick slices with a size of 4X6 cm and a thickness of 3 mm, and dry it by hot air. The drying temperature is 60 °C, the drying time is 2 days, and the moisture content is 10%.
[0034] (2) Put the raw slices of Polygonatum kingianum into a traditional air puffing machine, start puffing after heating for 5 min, and the pressure is 0.9 MPa. (3) The mass ratio of the raw slices of Polygonatum kingianum to clear water is 1:1. After soaking for 1 h, carry out high-pressure treatment. The treatment pressure is 0.1 MPa, and the pressure holding time is 20 minutes.
[0035] (4) Dry by hot air. The drying temperature is 60 °C, and the drying time is 2 days.
[0036] (5) Under aseptic conditions, add a mixed bacterial solution of microorganisms to the dried Polygonatum kingianum slices. The strain types and ratios are Lactobacillus plantarum: Lactobacillus paracasei: Lactobacillus acidophilus = 1:1.5:1 (v / v / v). The material-liquid ratio of Polygonatum kingianum material to bacterial solution is 1:1 (g / mL). Carry out solid-state co-fermentation, cultivate at a constant temperature of 37 °C, and ventilate and ferment for 7 days.
[0037] (6) Dry by hot air. The drying temperature is 60 °C, and the drying time is 2 days.
[0038] (7) Crush the dried Polygonatum kingianum slices and pass through a 40-mesh sieve to obtain Polygonatum kingianum powder.
[0039] Example 2
[0040] (1) Select fresh Polygonatum kingianum, wash it clean, cut it into thick slices with a size of 4X6 cm and a thickness of 4 mm, and dry it by heat pump. The drying temperature is 70 °C, the drying time is 1 day, and the moisture content is 10%.
[0041] (2) Put the raw slices of Polygonatum kingianum into a traditional air puffing machine, start puffing after heating for 5 min, and the pressure is 1.2 MPa. (3) The mass ratio of the raw slices of Polygonatum kingianum to clear water is 1:1.5. After soaking for 1 h, carry out high-pressure treatment. The treatment pressure is 0.13 MPa, and the pressure holding time is 30 minutes.
[0042] (4) Dry by heat pump. The drying temperature is 70 °C, and the drying time is 1 day.
[0043] (5) Under aseptic conditions, add a mixed bacterial solution of microorganisms to the dried Polygonatum kingianum slices. The types and proportions of the strains are Lactobacillus plantarum: Lactobacillus paracasei: Lactobacillus acidophilus = 2:1:1 (v / v / v). The ratio of the Polygonatum kingianum material to the bacterial solution is 1:2 (g / mL). Conduct solid-state co-fermentation, incubate at a constant temperature of 37°C, and ventilate and ferment for 7 days.
[0044] (6) Heat pump drying, the drying temperature is 70°C, and the drying time is 1 day.
[0045] (7) Crush the dried Polygonatum kingianum slices and pass through a 40-mesh sieve to obtain Polygonatum kingianum powder.
[0046] Example 3
[0047] (1) Wash the fresh Polygonatum kingianum clean, cut it into thick slices with a size of 4X6 cm and a thickness of 5 mm, and conduct hot air drying. The drying temperature is 70°C, the drying time is 2 days, and the moisture content is 10%.
[0048] (2) Put the raw Polygonatum kingianum slices into a traditional air puffing machine, start puffing after heating for 10 minutes, and the pressure is 1.0 MPa.
[0049] (3) The mass ratio of the raw Polygonatum kingianum slices to clear water is 1:2. After soaking for 1 hour, conduct high-pressure treatment. The treatment pressure is 0.15 MPa, and the pressure holding time is 25 minutes.
[0050] (4) Hot air drying, the drying temperature is 70°C, and the drying time is 2 days.
[0051] (5) Under aseptic conditions, add a mixed bacterial solution of microorganisms to the dried Polygonatum kingianum slices. The types and proportions of the strains are Lactobacillus plantarum: Lactobacillus paracasei: Lactobacillus acidophilus = 1:2:1 (v / v / v). The ratio of the Polygonatum kingianum material to the bacterial solution is 1:1 (g / mL). Conduct solid-state co-fermentation, incubate at a constant temperature of 37°C, and ventilate and ferment for 5 days.
[0052] (6) Hot air drying, the drying temperature is 70°C, and the drying time is 2 days.
[0053] (7) Crush the dried Polygonatum kingianum slices and pass through a 40-mesh sieve to obtain Polygonatum kingianum powder.
[0054] Main experimental methods
[0055] (1) Determine the polysaccharide content of the sample (refer to the method for determining the polysaccharide content of Polygonatum in the Chinese Pharmacopoeia 2022, and determine the polysaccharide content of Polygonatum by the anthrone-sulfuric acid method).
[0056] (2) Determine the content of the irritant component saponin (use diosgenin as the standard product and determine the saponin content of Polygonatum by the vanillin-perchloric acid colorimetric method).
[0057] Sample preparation: Weigh 4.0 g of each sample powder into a 100 mL stoppered conical flask, use 70% ethanol as the extraction solvent, with a solid-liquid ratio of 1:15 (g / mL), a power of 150 W, perform ultrasonic extraction for 40 min, wash and filter multiple times, and collect the filtrate. Use the water-saturated solution of n-butanol to extract and purify the filtrate twice. After collecting the extract, concentrate it under reduced pressure to evaporate the solvent, dissolve it in methanol, and transfer it to a 50 mL volumetric flask and make up the volume to obtain the sample saponin test solution. Take 200 μL of each test solution and measure the absorbance according to the method for preparing the standard curve of polygonatum saponin. (2) Determine the content of the irritant component calcium oxalate needle crystals (convert the calcium oxalate needle crystals in the sample into oxalic acid and determine its content by high performance liquid chromatography)
[0058] Sample preparation: Weigh 0.10 g of the sieved powder accurately into a 10 mL centrifuge tube, add 3 mL of pure water, mix well by ultrasonic for 10 min, then place it in a water bath at 60 °C for 10 min, mix well every 5 min. Take it out, centrifuge at 3000 rpm for 10 min, pour out the supernatant, add 2 mL of hot pure water to the residue, repeat the treatment twice. After centrifugation, add 0.2 mL of hydrochloric acid solution (volume ratio 1:1) and 2 mL of pure water to the residue and mix well, place it in a water bath at 60 °C for 10 min, mix well every 5 min. Take it out, centrifuge at 3000 rpm for 10 min, aspirate the supernatant, wash the residue twice with 2 mL of 0.1 mol / L hydrochloric acid solution, combine the supernatants after centrifugation, make up the volume to 10 mL with pure water, and filter through a 0.45 μm microporous filter membrane to obtain the solution.
[0059] (3) Determine the content of the irritant component n-hexanal (determine the volatile components of the sample by gas chromatography-mass spectrometry) GC conditions: HP-5MS Ultra Inert chromatographic column (30 m × 250 μm × 0.25 μm); the carrier gas is He, the flow rate of the chromatographic column is 0.8 mL / min, the injection port temperature is 250 °C, in the splitless injection mode, the temperature programming is an initial temperature of 40 °C, hold for 3 min, increase to 130 °C at a rate of 5 °C / min, then increase to 220 °C at a rate of 20 °C / min, hold for 0.5 min, and the injection volume is 1 μL. Run at a temperature of 270 °C and a flow rate of 1.0 mL / min for 2 min.
[0060] MS conditions: EI ion source, electron energy 70 eV, ion source temperature 230 °C, quadrupole temperature 150 °C, transfer line temperature 250 °C, mass scanning range is 35 - 500 m / z; no solvent delay.
[0061] Sample treatment: Weigh accurately 3.0 g of the sieved sample powder, place it in a 15-ml headspace vial, add an equal mass of pure water, and equilibrate it in a constant-temperature water bath at 70 °C for 30 min. After equilibration, insert the well-aged extraction head into the headspace vial, push out the fiber head, and extract for 30 min. After extraction, retract the fiber head, manually insert the extraction head into the injection port at 250 °C, push out the extraction head, and desorb for 5 min to complete headspace injection.
[0062] (4) Evaluation of irritation degree
[0063] Select a certain number of sensory evaluation personnel with high sensitivity and discrimination ability to the pungency (irritation) of Polygonatum sibiricum, and exclude some personnel with strong preference or rejection for it. After training the selected 10 sensory evaluators, conduct the sensory evaluation experiment on the irritation of Polygonatum sibiricum. The specific operation is to add 10 g of Polygonatum sibiricum powder to 200 mL of warm water and stir. Take the irritation of the raw Polygonatum sibiricum slices obtained in step (1) as 100 points, and score other samples according to the relative irritation. The smaller the score, the less irritating taste. After tasting one sample, rinse the mouth and rest for five minutes before tasting the next sample. Record the tasting results of all evaluators.
[0064] Main experimental results
[0065] 1. Retention of active ingredients in Polygonatum sibiricum
[0066] After pretreatment by puffing and then by high-pressure + fermentation, the content of polysaccharides in Polygonatum sibiricum is 132.56 mg / g, which is significantly higher than the polysaccharide content of 71.79 mg / g in the "nine-steaming and nine-sunning" Polygonatum sibiricum products, and the effective activity is retained.
[0067] 2. Comparison of the effects of single treatment and combined treatment
[0068] Sample D with significantly reduced irritation was obtained through three steps of pretreatment by air puffing, high pressure, and fermentation. Compare it with sample A treated only by air puffing, sample B treated only by high pressure, sample C treated only by fermentation, sample AB treated by pretreatment by puffing and high pressure, sample BC treated by high pressure and fermentation, and sample AC treated by pretreatment by puffing and fermentation.
[0069] After drying the fresh Polygonatum sibiricum according to step (1), conduct single pretreatment by puffing, high pressure, and fermentation respectively according to the parameters in each example to obtain sample A, sample B, and sample C; then conduct high-pressure or fermentation treatment on sample A according to the parameters in each example to obtain sample AB and sample AC; conduct fermentation treatment on sample B according to the parameters in each example to obtain sample BC; conduct fermentation treatment on sample AB according to the parameters in each example to obtain sample D.
[0070] Comparison of the Contents and Irritation Scores of Irritating Components in Samples Treated Individually and Collaboratively
[0071]
[0072] Note: Different superscript letters for the data in the same column indicate significant differences from each other, p < 0.05. The same below.
[0073] As shown by the contents of irritating components in the samples in Appendix Table 1, the comprehensive irritation score of the samples obtained through all steps of the present invention is between 0.23 and 0.27, which is about 85% lower than that of the raw polygonatum sibiricum. After pretreatment by puffing and then collaborative treatment by high pressure + fermentation, the polygonatum sibiricum samples have the best effect of removing irritation, and the contents of irritating components such as saponins, calcium oxalate raphides, and hexanal are lower than those in the polygonatum sibiricum samples treated by individual methods. Although the polygonatum sibiricum slices treated individually by pretreatment by puffing, high pressure, fermentation, and the mixture of two of these methods to a certain extent destroy the irritating components in polygonatum sibiricum, thereby reducing the adverse irritation to the human body, the human body will still feel a strong irritating effect. Only after collaborative treatment will the irritation be greatly reduced, and at the same time, the taste will also be improved, and the comprehensive irritation score is reduced by about 88%, with a significant difference.
[0074] 3. Comparison of the Fermentation Effects of Single Strains and Composite Strains
[0075] In each example, the polygonatum sibiricum samples obtained by co-fermentation of mixed strains are denoted as sample F, and the polygonatum sibiricum samples obtained by single-strain fermentation are denoted as sample E, and the remaining steps are all operated according to the parameters in the specific examples.
[0076] Table 2 Comparison of the Contents and Irritation Scores of Irritating Components in Samples Fermented by Single Strains and Multi-Strain Mixtures
[0077]
[0078] As shown by the contents of irritating components and the comprehensive irritation score in Appendix Table 2, the comprehensive irritation score of the polygonatum sibiricum samples fermented only by single strains is between 1.43 and 1.86, while the comprehensive irritation score of the polygonatum sibiricum samples fermented by multi-strain mixtures is between 0.23 and 0.27, which is significantly reduced by about 83%. Therefore, compared with the polygonatum sibiricum samples fermented by single strains, the effect of removing irritation of the polygonatum sibiricum samples fermented by multiple strains together is enhanced.
[0079] In summary, the main synergistic means for reducing the irritation of raw Polygonatum sibiricum is "the air puffing pretreatment in step (2) and the high pressure in step (3) + the solid-state fermentation in step (5)". Among them, the air puffing pretreatment promotes the dissolution of irritating components in the content and has a certain impact on volatile irritating components. The high-pressure treatment can improve the texture and taste of Polygonatum sibiricum. The fermentation process is mild and can better retain the polysaccharide active components of Polygonatum sibiricum on the premise of further reducing its irritation. Therefore, the reduction of irritation, improvement of taste, and retention of efficacy of raw Polygonatum sibiricum are achieved simultaneously through the air puffing pretreatment in step (2), the high pressure in step (3), and the solid-state fermentation in step (5). Without any of these parts, the effect will not be ideal.
[0080] The above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.
[0081] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.
Claims
1. A preparation method of low - irritation polygonatum sibiricum powder, characterized in that, It includes the following steps: (1) Clean, slice and dry the polygonatum sibiricum until the moisture content is 10-20%; (2) Perform air puffing treatment on the raw polygonatum sibiricum slices obtained in step (1); (3) Soak the polygonatum sibiricum slices obtained in step (2) with clear water, place them in a high-pressure sterilization device, and perform high-pressure treatment; (4) Dry the polygonatum sibiricum slices obtained in step (3); (5) In the polygonatum sibiricum slices obtained in step (4), under sterile conditions, add a mixed bacterial liquid of two or more microorganisms, perform solid-state co-fermentation, incubate at a constant temperature and ferment with ventilation; (6) Dry the polygonatum sibiricum slices obtained in step (5); (7) Crush the polygonatum sibiricum slices obtained in step (6), sieve them, and obtain polygonatum sibiricum powder.
2. The preparation method according to claim 1, characterized in that, In step (1), the size of the polygonatum sibiricum slices is 4-6 cm, and the thickness is 3-5 mm; the drying method is heat pump drying or hot air drying, the drying temperature is 60-70 °C, and the drying time is 1-3 days.
3. The preparation method according to claim 1, wherein In step (2), the puffing treatment is to put the polygonatum sibiricum slices into an air puffing machine, start puffing after heating for 5-10 min, and the pressure is 0.9-1.2 Mpa.
4. The preparation method according to claim 1, characterized in that, In step (3), the pressure of the high-pressure treatment is 0.10-0.15 MPa, and the treatment time is 25-35 minutes.
5. The preparation method according to claim 1, characterized in that, In step (5), the mixed bacterial liquid is Lactobacillus plantarum: Lactobacillus paracasei: Lactobacillus acidophilus = 1-2:1-2:1-2 (v / v / v), and the material-liquid ratio of the polygonatum sibiricum slices to the mixed bacterial liquid is 1:1-2 (g / mL).
6. The preparation method according to claim 5, characterized in that, The conditions for the solid-state co-fermentation are: the temperature is 30-40 °C, and ferment for 5-9 days under ventilation conditions.
7. The preparation method according to claim 1, characterized in that, In steps (4) and (6), the drying temperature is 60-70 °C, and the drying time is 1-3 days.
8. The preparation method according to claim 1, characterized in that, In step (7), the sieving is through a 40-mesh sieve.
9. The preparation method according to claim 1, characterized in that, In step (3), the soaking time with clear water is 1-2 hours, and the mass ratio of the polygonatum sibiricum slices to the clear water is 1:1-1:
2.
10. Use of the polygonatum sibiricum powder prepared by the preparation method according to any one of claims 1 to 9, characterized in that, The extract of the polygonatum sibiricum powder is used to prepare polygonatum sibiricum beverages, yogurt, medicinal liquor, biscuits, chewable candies or crisps.