Preparation method of polygonatum sibiricum extract, instant solid beverage of polygonatum sibiricum extract and preparation method thereof

Abstract

The present application relates to an instant solid beverage of polygonatum extract and a preparation method thereof, the method comprising the following steps: using nine-steamed and nine-processed polygonatum and dry-heat processed polygonatum as raw materials, the proportion of nine-steamed and nine-processed polygonatum being 25% to 75%, extracting polygonatum extract by mixing with water at low temperature or extracting separately and then mixing; preparing a polygonatum extract solid beverage with a specific shape by concentrating, pre-freezing and vacuum drying the polygonatum extract. The extract prepared by the method has a sweet and sticky taste, a bright orange-red soup color, and low fructose and water content; the freeze-drying process does not require the use of any auxiliary materials, and the prepared polygonatum solid beverage has a regular appearance and dissolves quickly.

Description

Technical Field

[0001] The invention relates to the field of biotechnology, and in particular to a preparation method of a polygonatum sibiricum extract, a polygonatum sibiricum extract instant solid beverage and a production method thereof. Background Art

[0002] As a resource that can be used as both medicine and food, the main processing method of Polygonatum sibiricum is nine-steaming and nine-drying, that is, after nine consecutive steaming and sun-drying or heat-drying treatments, it is brewed and drunk as Polygonatum sibiricum tea. After nine steaming and nine drying, the color of Polygonatum sibiricum becomes black and bright, and the soup color after brewing is translucent orange-red, and the taste is moist and slightly sweet, which effectively removes the astringency of raw Polygonatum sibiricum and is deeply loved by consumers. However, the processing technology of nine-steaming and nine-drying Polygonatum sibiricum is complicated, which makes its cost relatively high; at the same time, the polysaccharide components in Polygonatum sibiricum are hydrolyzed in large quantities during the processing, producing a large amount of reducing sugars mainly composed of fructose.

[0003] The nine-steaming and nine-processing process is beneficial to increase the effective active ingredients such as saponins, flavonoids, and polyphenols in Polygonatum. The content of polyphenols and flavonoids in fresh Polygonatum is low, 0.47-1.45 mg / g and 2.1-7.1 mg / g, respectively. Steaming can increase the content of Polygonatum saponins by about 6-7 times; the content of flavonoids can be increased from 1.4 mg / g to 2.5 mg / g; and the total polyphenol content can be increased from 3.1 mg / g to 41.1 mg / g. However, the nine-steaming and nine-processing process can also cause a large amount of degradation of the polysaccharide components in Polygonatum, such as the polysaccharide content in Polygonatum multiflorum can be reduced from more than 15% to less than 2%, and the content of Polygonatum acanthus can be reduced from more than 7% to less than 1%. The degradation of a large amount of polysaccharides will significantly increase the content of reducing sugars in the nine-steaming and nine-processing Polygonatum, especially the content of fructose. For example, after nine steamings and nine processings, the free fructose content of Polygonatum odoratum can be increased from less than 1% to more than 25%, and the reducing sugar content can be increased from about 1% to nearly 50%.

[0004] Although Polygonatum odoratum produces a large amount of fructose after nine steamings and nine processings, it has a good taste and a low impact on blood sugar levels, but fructose has a low satiety. A large intake of fructose will increase the total calories of food, and high-dose fructose intake will lead to the occurrence of metabolic syndrome, promote fat generation, cause obesity and non-alcoholic fatty liver, metabolic disorders and some complications, such as insulin resistance and type II diabetes. High-dose fructose intake will also accumulate a large number of intermediates during the metabolic process, which will also have an impact on the body. For example, fructose will quickly and massively consume adenosine triphosphate (ATP) during metabolism, and this process is irreversible, eventually causing adenosine monophosphate (AMP) to accumulate in the body, stimulating the increase in AMP deaminase activity, and converting AMP into uric acid, and the gradual accumulation of uric acid will induce hyperuricemia. Therefore, the health effects and safety of fructose have received a lot of attention. In addition, with the development of intestinal flora research in recent years, more and more studies have also found that high doses of fructose can increase intestinal permeability by changing the structure of intestinal flora and reducing the thickness of the colon mucosa, which makes it easier for intestinal microorganisms to enter the colon mucosa and induce diseases such as colitis.

[0005] The impact of fructose on health is closely related to its intake dose. The above-mentioned adverse health effects mostly occur in the case of high fructose intake. When a person's fructose intake is >100g / d, the levels of triglycerides, total cholesterol and low-density lipoprotein in plasma will increase; while isocaloric fructose replacing other carbohydrates is beneficial to the control of blood sugar and glycosylated hemoglobin. When fructose intake is less than 90g / d, it is not related to the onset of diabetes; when the dietary fructose energy supply ratio is between 5.9%-9.4%, it is beneficial to blood pressure control, and when it exceeds 9.4%, it will increase the incidence of hypertension.

[0006] When nine-steamed and nine-processed Polygonatum is used as a raw material and a spray or freeze-drying process is used to prepare an instant solid beverage, especially when a three-dimensional freeze-drying process is used to prepare solid beverages and other foods with a specific shape, the freeze-drying is difficult, which can easily cause the product to collapse in structure or expand and bubble, and it is difficult to dry thoroughly, which seriously affects the quality of the product and reduces the yield rate. Therefore, when a solid beverage is prepared using only nine-steamed and nine-processed Polygonatum extract as a raw material, especially in order to improve the yield rate of the product during three-dimensional freeze-drying, it is often necessary to add auxiliary materials such as dextrin, which on the one hand will reduce the content of Polygonatum in the product, and on the other hand will affect the taste of Polygonatum. Therefore, how to prepare a solid beverage with good taste and soup color and moderate fructose content using Polygonatum as a single raw material is an important technical problem currently faced. Summary of the invention

[0007] Based on this, it is necessary for this application to provide a solid beverage of polygonatum extract using nine-steamed and nine-processed and dried mixed polygonatum as raw materials and a preparation method thereof, which can not only retain the taste and soup color of the nine-steamed and nine-processed polygonatum, but also reduce the fructose content, and is also conducive to the three-dimensional shaping of the solid beverage.

[0008] The technical solutions include the following:

[0009] In a first aspect, the present application provides a method for preparing a polygonatum sibiricum extract, the preparation method comprising the following steps:

[0010] Mix the water-extracted, steamed and processed polygonatum with the dry-heat processed polygonatum, collect the extract and prepare the polygonatum extract; or

[0011] Separately extracting and processing polygonatum by water, steaming and steaming, and drying and heating, collecting and mixing the corresponding extracts, and preparing polygonatum extract;

[0012] Based on the total mass of the nine-steamed and nine-processed polygonatum and the dry-heat processed polygonatum, the nine-steamed and nine-processed polygonatum accounts for 25% to 75%.

[0013] In one of the embodiments, the ratio of the nine-steamed and nine-processed polygonatum to the total mass of the nine-steamed and nine-processed polygonatum and the dry-heat processed polygonatum is 35% to 65%.

[0014] In one embodiment, the dry heat processing method includes hot fluidization processing, baking processing or microwave heat processing.

[0015] In one embodiment, the dry heat processing method satisfies one or more of the following conditions:

[0016] (1) The conditions of the hot fluidization processing include a temperature of 165°C to 175°C, a surface air velocity of 2.0 m / s to 4 m / s, and a time of 15 min to 25 min;

[0017] (2) The baking conditions include baking at 165°C to 175°C for 10 min and baking at 215°C to 220°C for 160s to 180s;

[0018] (3) The conditions of the microwave thermal processing include a microwave duty cycle of 0.5 to 0.7, a pulse period of 16 s to 18 s, a wind speed of 1.8 m / s to 2.0 m / s, and a drying time of 12 min to 13 min.

[0019] In one embodiment, the extraction process conditions are 20°C~60°C for 4h~12h, wherein the solid-liquid mass ratio is 1:2~1:6.

[0020] In a second aspect, the present application also provides a polygonatum extract prepared by the preparation method described in the first aspect.

[0021] In a third aspect, the present application further provides a polygonatum solid beverage, wherein the polygonatum beverage comprises the polygonatum extract described in the second aspect.

[0022] In a fourth aspect, the present application also provides a method for preparing a polygonatum solid beverage, the preparation method comprising the following steps:

[0023] The polygonatum sibiricum extract is prepared by the preparation method described in the first aspect; and

[0024] The polygonatum sibiricum extract is prepared into a polygonatum sibiricum solid beverage by using the steps of concentration, pre-freezing and vacuum drying;

[0025] In one embodiment, the concentration is performed by vacuum low-temperature concentration, and the solid content after concentration is 20% to 35%.

[0026] In one embodiment, the pre-freezing conditions include: the temperature is lower than -25°C and the time is not less than 1.5 hours.

[0027] In one embodiment, the vacuum drying process includes primary drying and secondary drying; the conditions for primary drying include: temperature of -10°C to 10°C, and time of not less than 10 hours; the conditions for secondary drying include: temperature of 20°C to 40°C, and time of not less than 4 hours.

[0028] Compared with the traditional technology of preparing solid beverages with single nine-steamed and nine-processed polygonatum as raw material, this application has the following beneficial effects:

[0029] The present application uses dry heat treated polygonatum and nine-steamed and nine-processed polygonatum as raw materials to prepare polygonatum extract, which can reduce processing costs, reduce fructose content, ensure soup color and taste, and reduce the difficulty of three-dimensional freeze-drying; further, through three-dimensional freeze-drying technology, the obtained polygonatum solid beverage has a better product appearance and faster solubility. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is the appearance of a freeze-dried solid beverage of polygonatum sibiricum extract. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0033] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0034] The term "preferred" used herein is only used to describe an implementation method or example with better effects. It should be understood that it does not constitute a limitation on the scope of protection of this application.

[0035] The terms "further", "further" and the like used herein are used for descriptive purposes to indicate differences in content, but should not be construed as limiting the scope of protection of this application.

[0036] As used herein, the terms "comprises," "comprising," or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device that includes the element.

[0037] As used herein, "multiple", "multiple", "multiple times", "multiple groups", etc., unless otherwise specified, refer to a number greater than or equal to 2. For example, "one or more" means one or greater than or equal to two. "More than" includes the number itself, for example, "more than two" includes two, three or more.

[0038] In the "first aspect", "second aspect", "third aspect" and "fourth aspect" mentioned herein, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first" and "second" only serve the purpose of non-exhaustive enumeration and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0039] The numerical ranges involved herein are considered continuous within the numerical ranges unless otherwise specified, and include the minimum and maximum values ​​of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise specified, all ranges disclosed in this application should be understood to include any and all subranges included therein.

[0040] The present application prepares a solid beverage having a certain shape by mixing the nine-steamed and nine-processed polygonatum with the dry-heat treated polygonatum in a certain proportion, extracting the mixture at low temperature, and then concentrating, pre-freezing and vacuum drying the mixture. The solid beverage finally obtains a solid beverage which can retain the sweet and sticky taste and the transparent orange-red soup color of the nine-steamed and nine-processed polygonatum extract, and can control the content of fructose and reducing sugar in the extract within an appropriate range. At the same time, the problem of the difficulty in freeze-drying the polygonatum extract, especially the problem of bubble deformation or structural collapse and difficulty in complete drying, is solved.

[0041] Therefore, one embodiment of the present application provides a method for preparing a polygonatum extract, the method comprising the following steps:

[0042] The nine-steamed and nine-processed polygonatum is mixed with the dry-heat processed polygonatum, and then water is added for extraction to prepare the polygonatum extract; or

[0043] The nine-steamed and nine-processed polygonatum and the dry-heat processed polygonatum are respectively added into water for extraction, and the obtained extracts are mixed to prepare a polygonatum extract;

[0044] Among them, based on the total mass of nine-steamed and nine-processed polygonatum and dry-heat processed polygonatum, the proportion of nine-steamed and nine-processed polygonatum is 25%~75%; optionally, based on the total mass of nine-steamed and nine-processed polygonatum and dry-heat processed polygonatum, the proportion of nine-steamed and nine-processed polygonatum is 35%-65%; further optionally, based on the total mass of nine-steamed and nine-processed polygonatum and dry-heat processed polygonatum, the proportion of nine-steamed and nine-processed polygonatum is 45%-55%. According to the above ratio, dry-heat treated polygonatum and nine-steamed and nine-processed polygonatum are combined to obtain polygonatum extract. After concentration and three-dimensional freeze-drying, the shape is intact, the surface is smooth, the interface is flat, and the fragmentation is low, the water content is low, and the dissolution is fast. There is no need to add other auxiliary materials to the polygonatum extract to maintain the freeze-drying effect.

[0045] The present application found that when the content of reducing sugars such as fructose in the Polygonatum sibiricum extract is high, the eutectic point of the reducing sugar represented by fructose is relatively low (-48°C) and it is highly hygroscopic and has high viscosity. The extract is difficult to freeze-dry and the moisture is difficult to remove completely, especially when three-dimensional freeze-drying is performed, which will cause bubble deformation or structural collapse and make it difficult to dry completely.

[0046] In a specific example, the dry heat processing includes a thermal fluidization process, a baking process, or a microwave heat process.

[0047] In a specific example, the conditions of the hot fluidization processing include a temperature of 165° C. to 175° C., a surface air velocity of 2.0 m / s to 4 m / s, and a time of 15 min to 25 min.

[0048] In a specific example, the baking process conditions include baking at 165° C. to 175° C. for 10 minutes, and baking at 215° C. to 220° C. for 160 seconds to 180 seconds.

[0049] In a specific example, the conditions of microwave thermal processing include a microwave duty cycle of 0.5 to 0.7, a pulse period of 16 s to 18 s, a wind speed of 1.8 m / s to 2.0 m / s, and a drying time of 12 min to 13 min.

[0050] In a specific example, the extraction process is low-temperature extraction, wherein the solid-liquid ratio is 1:2-1:6, which can be selected as 1:2, 1:3, 1:4, 1:5 or 1:6, and is preferably 1:3~1:5; the extraction temperature is 20℃~60℃, which can be selected as 20℃, 25℃, 30℃, 35℃, 40℃, 45℃, 50℃, 55℃ or 60℃, and is preferably 30℃~50℃; the extraction time is 4h~12h, which can be selected as 4h, 5h, 6h, 7h, 8h, 9h, 10h, 11h or 12h, and is preferably 6h~10h.

[0051] In a specific example, after obtaining the extract, the process further includes concentration, pre-freezing and vacuum drying. In a specific example, the process further includes injection molding before pre-freezing. Injection molding pre-freezing molding.

[0052] In a specific example, vacuum low-temperature concentration is used for concentration, and the solid content after concentration is 20%~35%, which can be selected as 20%, 22%, 24%, 25%, 26%, 28%, 30%, 32% or 35%; it can be selected as 25%~30%, or 22%~28%. The solid content affects the freeze-drying effect. After freeze-drying, the above-mentioned concentrated solid content has a good shape, a smooth surface, a flat interface, low crushing degree, low water content and fast dissolution.

[0053] In a specific example, the pre-freezing treatment temperature is lower than -25°C; the pre-treatment time is not less than 1.5h; optionally, the pre-freezing treatment temperature is -45°C~-30°C, and the pre-treatment time is 2h~4h; optionally, the pre-freezing treatment temperature is -40°C~-35°C, and the pre-treatment time is 2h~3h.

[0054] In a specific example, the vacuum drying process includes primary drying and secondary drying.

[0055] In a specific example, the conditions for primary drying include: temperature of -10℃~10℃, time of not less than 10 hours; optionally, temperature of -10℃~10℃, optionally, time of 10h~20h; optionally, temperature of -5℃~5℃, time of 15h~25h; optionally, temperature of 0℃~5℃, time of 10h~20h.

[0056] In a specific example, the conditions for secondary drying include: temperature of 20°C~40°C, time of not less than 4 hours; optionally, temperature of 25°C~40°C, time of 5 hours~10 hours; optionally, temperature of 20°C~25°C, time of 5 hours~10 hours; optionally, temperature of 25°C~35°C, time of 6 hours~12 hours.

[0057] Freeze-drying the polygonatum extract according to the above freeze-drying parameters can avoid structural collapse or expansion and bubbling of the product, thereby improving the quality of the product and the yield rate.

[0058] One embodiment of the present application also provides a polygonatum extract obtained by the preparation method.

[0059] One embodiment of the present application also provides a polygonatum extract solid beverage, wherein the polygonatum beverage comprises the polygonatum extract.

[0060] One embodiment of the present application also provides a method for preparing a solid beverage of polygonatum sibiricum extract, comprising the following steps:

[0061] The above-mentioned preparation method is used to prepare the polygonatum sibiricum extract; and,

[0062] The polygonatum sibiricum extract is prepared into a polygonatum sibiricum extract solid beverage by sequentially comprising the steps of concentration, pre-freezing and vacuum drying.

[0063] In one specific example, the concentration step is as described above.

[0064] In a specific example, the pre-freezing step is the same as described above.

[0065] In a specific example, the vacuum drying process is the same as described above.

[0066] The embodiments of the present application will be described in detail below in conjunction with examples. It should be understood that these examples are only used to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for which specific conditions are not specified in the following examples are preferably referred to the guidance provided in the present application, and can also be based on the experimental manual or normal conditions in this area, can also be based on the conditions recommended by the manufacturer, or refer to experimental methods known in the art.

[0067] In the following specific embodiments, the measured parameters of raw material components may have slight deviations within the range of weighing accuracy unless otherwise specified. For temperature and time parameters, acceptable deviations caused by instrument test accuracy or operation accuracy are allowed.

[0068] The nine-steamed and nine-processed polygonatum involved in the following examples was purchased from Zhengzhou Jiufang Yunkang Biotechnology Co., Ltd.

[0069] Example 1

[0070] Raw materials: 250g of nine-steamed and nine-processed polygonatum, 750g of heat-fluidized polygonatum (temperature 170°C, surface air velocity 3.0m / s, time 20min).

[0071] Extraction process: After mixing the two raw materials, add 5 kg of water, extract at 60°C for 8 hours, and filter to obtain the filtrate.

[0072] Example 2

[0073] Raw materials: 750 g of nine-steamed and nine-processed polygonatum, 250 g of pulsed continuous microwave heat-processed polygonatum (microwave duty cycle 0.6, pulse period 17 s, wind speed 1.9 m / s, drying time 12.5 min).

[0074] Extraction process: After the two raw materials are mixed, 5 kg of water is added, extracted at 60°C for 8 hours, and the filtrate is filtered.

[0075] Example 3

[0076] Raw materials: 650g of steamed and processed polygonatum, 350g of roasted polygonatum slices (170℃ for 10min, 220℃ for 170s).

[0077] Extraction process: After the two raw materials are mixed, 5 kg of water is added, extracted at 60°C for 8 hours, and the filtrate is filtered.

[0078] Example 4

[0079] Ingredients: 550g of steamed and processed polygonatum, 450g of microwave-treated polygonatum slices (700W, 160s).

[0080] Extraction process: add 3kg water to 550g of nine-steamed and nine-processed polygonatum, and extract at 30℃ for 6h; add 2kg water to 450g of microwave-treated polygonatum slices, and extract at 60℃ for 6h; filter the extract and mix them.

[0081] Example 5

[0082] Raw materials: 350g of steamed and processed polygonatum, 550g of roasted polygonatum slices (170℃ 10min, 220℃ 170s).

[0083] Extraction process: After the two raw materials are mixed, 5 kg of water is added, extracted at 60°C for 8 hours, and the filtrate is filtered.

[0084] Comparative Example 1

[0085] Ingredients: 1000g of steamed and processed Polygonatum sibiricum.

[0086] Extraction process: add 5 kg of water, extract at 60℃ for 8 hours, and filter to obtain the filtrate.

[0087] Physical and chemical indicators: The solid content of the extract is 9.5%, the content of Polygonatum sibiricum polysaccharide is 0.2%, the content of fructose is 4.9%, and the content of xanthan sugar is 9.4%.

[0088] Comparative Example 2

[0089] Raw materials: 1000 g of Polygonatum sibiricum treated by heat fluidization (temperature 170 °C, surface air velocity 3.0 m / s, time 20 min).

[0090] Extraction process: add 5 kg of water, extract at 60℃ for 8 hours, and filter to obtain the filtrate.

[0091] Comparative Example 3

[0092] Raw materials: 200 g of nine-steamed and nine-processed polygonatum, 800 g of heat-fluidized polygonatum (temperature 170 °C, surface air velocity 3.0 m / s, time 20 min).

[0093] Extraction process: After the two raw materials are mixed, 5 kg of water is added, extracted at 60°C for 8 hours, and the filtrate is filtered.

[0094] Comparative Example 4

[0095] Raw materials: 800g of nine-steamed and nine-processed polygonatum, 200g of roasted polygonatum slices (170℃ 10min, 220℃, 170s).

[0096] Extraction process: After the two raw materials are mixed, 5 kg of water is added, and the mixture is extracted at 60°C for 8 hours, and the filtrate is filtered to obtain the filtrate. The solid content of the extract is 8.84%, the content of Polygonatum cyrtonema polysaccharide is 0.56%, the content of fructose is 3.96%, and the content of reducing sugar is 7.7%.

[0097] Comparative Example 5

[0098] Ingredients: 550g of steamed and processed polygonatum, 450g of sun-dried polygonatum slices (sliced ​​and dried naturally for 2 days).

[0099] Extraction process: add 3kg water to 550g of nine-steamed and nine-processed polygonatum, and soak at 30℃ for 6h; add 2kg water to 450g of sun-dried polygonatum slices, and soak at 60℃ for 6h; filter the extract and mix them.

[0100] Test results:

[0101] 1. Sensory scoring of the extract

[0102] The extracts obtained in Examples 1-5 and Comparative Examples 1-5 were diluted with water to a solid content of 1.5%, and then their colors were measured using a colorimeter, their sweetness was tested using an electronic tongue, and their sensory scores were calculated. The results are shown in Table 1.

[0103] Table 1 Physical and chemical properties and sensory scores of Polygonatum sibiricum extract

[0104]

[0105] 2. Comparison of three-dimensional freeze-drying effects:

[0106] The samples of Examples 1-5 and Comparative Examples 1-5 were vacuum concentrated to a solid content of 28%, poured into a mold, and then freeze-dried using a freeze-drying process with a pre-freezing temperature of -50°C, a pre-freezing time of 2h, a sublimation temperature of 5°C, a time of 20h, and a drying temperature of 25°C, a time of 10h. The effects after freeze-drying are shown in Table 2:

[0107] Table 2 Morphological characteristics of three-dimensional freeze-dried blocks of Polygonatum sibiricum extract

[0108]

[0109] The results of the polysaccharide, fructose and reducing sugar contents in the above samples are shown in Table 3:

[0110] Table 3 Physicochemical properties of lyophilized cubes of Polygonatum sibiricum extract

[0111]

[0112] Table 4 Comprehensive score table of three-dimensional freeze-dried blocks of polygonatum sibiricum extract

[0113]

[0114] Example 6-Example 14 and Comparative Example 6-Comparative Example 14 Optimization of freeze-drying process

[0115] Raw materials and extraction process: 650g of nine-steamed and nine-processed polygonatum, 350g of baked polygonatum (170℃ 10min, 220℃ 170s), after the two raw materials are mixed, 5kg of water is added, and the mixture is extracted at 60℃ for 8h, and the extract is filtered.

[0116] Concentrated freeze-drying process: The extract was concentrated at 50°C and 0.01 MPa until the solid content reached the required concentration in Table 5. Then the mold was poured and pre-frozen, sublimation dried and re-dried according to the parameters in Table 5. After drying, the appearance was observed and the friability, dissolution time and water content were measured.

[0117] Friability determination: friability tester is used for determination. The inner diameter of the cylinder is 286 mm, the depth is 39 mm, the sliding height is 156 mm, the rotation speed is set to 60 rpm, the rotation time is set to 4 minutes, and the friability = (initial block weight - final block weight) / initial block weight × 100%.

[0118] Dissolution time determination: Take 150 ml of distilled water at room temperature, stir it with a magnetic stirrer at 60 rpm, then put in a freeze-dried block of Polygonatum sibiricum (about 2.5 g) and start timing, recording the time it takes for the Polygonatum sibiricum to be completely dissolved.

[0119] Determination of water content: The drying method was used to determine the water content in freeze-dried Polygonatum. The method was to place the sample in an evaporating dish and dry it at 105°C to constant weight. The water content was then calculated based on the difference between the mass of lost water and the mass of the original sample.

[0120] Table 5 Processing parameters of three-dimensional freeze-dried blocks of polygonatum sibiricum extract

[0121]

[0122] Table 6 Characteristics of three-dimensional freeze-dried blocks of Polygonatum sibiricum extract

[0123]

[0124] Note: “-” indicates that the morphology of the freeze-dried product is incomplete and the friability cannot be determined.

[0125] Figure 1 This is the appearance of freeze-dried block of Polygonatum sibiricum extract (solid beverage).

[0126] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0127] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims, and the description may be used to interpret the content of the claims.

Claims

1. A method for preparing a polygonatum extract, characterized in that: The preparation method comprises the following steps: Mix the water-extracted, steamed and processed polygonatum with the dry-heat processed polygonatum, collect the extract and prepare the polygonatum extract; or Separately extracting and processing polygonatum by water, steaming and steaming, and drying and heating, collecting and mixing the corresponding extracts, and preparing polygonatum extract; Based on the total mass of the nine-steamed and nine-processed polygonatum and the dry heat processed polygonatum, the nine-steamed and nine-processed polygonatum accounts for 35% to 65%; The dry heat processing method includes any one of heat fluidization processing, baking processing or microwave heat processing; The dry heat processing method meets the following conditions: (1) The conditions of the hot fluidization processing include a temperature of 165°C to 175°C, a surface air velocity of 2.0 m / s to 4 m / s, and a time of 15 min to 25 min; (2) The baking conditions include baking at 165°C to 175°C for 10 min and baking at 215°C to 220°C for 160s to 180s; (3) The microwave thermal processing conditions include a microwave duty cycle of 0.5 to 0.7, a pulse period of 16 s to 18 s, a wind speed of 1.8 m / s to 2.0 m / s, and a drying time of 12 min to 13 min; The extraction process conditions are 20℃~60℃, extraction for 4h~12h, and the solid-liquid mass ratio is 1:2~1:

6.

2. The polygonatum sibiricum extract obtained by the preparation method according to claim 1.

3. A polygonatum extract solid beverage, characterized in that: The extract solid beverage comprises the polygonatum extract according to claim 2.

4. A method for preparing a polygonatum extract solid beverage, characterized in that: The preparation method comprises the following steps: The method of claim 1 is used to prepare the polygonatum extract; and The polygonatum sibiricum extract is prepared into a polygonatum sibiricum extract solid beverage by using the steps of concentration, pre-freezing and vacuum drying; The concentration is vacuum low-temperature concentration, and the solid content after concentration is 20%~35%; Pre-freezing conditions include: temperature below -25°C, time not less than 1.5h; The vacuum drying treatment includes primary drying and secondary drying; the conditions for primary drying include: temperature of -10°C~10°C, time of not less than 10 hours; the conditions for secondary drying include: temperature of 20°C~40°C, time of not less than 4 hours.

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