Production method of grape drying promoter

Abstract

The invention discloses a production method of a grape drying promoter, and belongs to the technical field of food processing.The grape drying promoter prepared by the method adopts a biological enzyme method to degrade a grape wax coat, the reaction condition is mild, and waste liquid can be discharged without being treated; a slow-release production technology is adopted, and effective components in the dry promoter are gradually released, so that the effective components are kept stable in a certain production process, and the quality of a product is ensured; an automatic indicating technology is adopted, and the supplement of the drying promoter is prompted through the color change of the drying promoter solution, so that the production efficiency is improved, and the product stability is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of food processing, and particularly relates to a production method of a grape drying accelerator. Background Art

[0002] Raisins are the main processed product of grapes, which can effectively alleviate the problem of grape marketing and increase farmers' economic income. Taking Turpan, Xinjiang as an example, grapes are dried in the air-drying room by natural hot air. During the drying process, the moisture inside the fruit diffuses freely through the peel. The surface of the grape peel has a waxy layer, forming irregular flaky crystals, which are stacked and scattered on the surface of the fruit, becoming the main resistance to the free diffusion of moisture. The waxy layer is mainly composed of fatty acids, primary alcohols, esters, aldehydes and alkanes. The chemical components of the waxy layer of grape peels of different varieties are different. Among them, octadecanoic acid, tridecanoic acid, octadecanoic acid, beeswax acid, 1-nonadecene and tetracosanol are common components.

[0003] At present, the industry often uses grape drying agents to reduce the effect of the wax layer on the free diffusion of grape water. The drying agent uses potassium carbonate, potassium hydroxide or sodium hydroxide as an active ingredient. The alkalinity of the solution destroys the wax layer of grapes and increases the free diffusion rate of water in grapes. During the use of the drying agent, the content of the active ingredient needs to be maintained at a fixed concentration. However, during the production process, the content of the active ingredient gradually decreases, and the stability of the product quality is insufficient. The drying agent solution is alkaline, and the waste liquid needs to be professionally treated, and the cost of use is high. Summary of the invention

[0004] The purpose of the present invention is to provide a method for producing a grape drying accelerator to solve the problems existing in the above-mentioned prior art.

[0005] One of the technical solutions provided by the present invention:

[0006] A grape drying agent, the raw materials of which include biological enzyme, dipotassium hydrogen phosphate, potassium dihydrogen phosphate, EDTA and monoglyceride.

[0007] Furthermore, the raw material also includes an indicator.

[0008] Preferably, the indicator is selected from phenolphthalein, neutral red, phenol red or cresol red.

[0009] The second technical solution of the present invention:

[0010] A method for producing a grape drying agent comprises the following steps: dissolving a uniform mixture of biological enzyme, dipotassium hydrogen phosphate, potassium dihydrogen phosphate, EDTA and glycerol monoglyceride in water to prepare the grape drying agent.

[0011] Preferably, per 1000kg of water, there are 11.18-22.36kg of dipotassium hydrogen phosphate, 0.81-1.64kg of potassium dihydrogen phosphate, 1.6 parts of EDTA and 1kg of monoglyceride, and 160,000-220,000 units of biological enzyme.

[0012] Preferably, the biological enzyme includes alkaline lipase and pancreatic enzyme, and the ratio of the alkaline lipase activity to the pancreatic enzyme activity is (1-3):1. More preferably, the ratio of the alkaline lipase activity to the pancreatic enzyme activity is 2.6:1.

[0013] The third technical solution provided by the present invention is:

[0014] The present invention continues to make improvements on the basis of the second technical solution and proposes a production method of a grape drying agent, comprising the following steps: dissolving a uniform mixture of dipotassium hydrogen phosphate, potassium dihydrogen phosphate and slow-release particles containing biological enzymes in water, fully dissolving and mixing, to prepare the grape drying agent.

[0015] Preferably, the biological enzyme includes alkaline lipase and pancreatic enzyme, and the ratio of the alkaline lipase activity to the pancreatic enzyme activity is (2.2-2.6):1.

[0016] In a preferred embodiment, the method for preparing the sustained-release particles comprises the following steps: adding biological enzymes, EDTA, and glycerol monoglyceride to a polylactic acid solution to form a polylactic acid mixed solution, adding the polylactic acid mixed solution to a polyvinyl alcohol aqueous solution, stirring the reaction, collecting the precipitate, washing, and freeze-drying to prepare the sustained-release particles.

[0017] The specific operation of the stirring reaction is as follows: controlling the pressure in the reactor to 0.05 MPa, stirring the reactor at 1000 r / min, heating to 40°C, then reducing the stirring reactor speed to 400 r / min, maintaining for 10 min, reducing the reactor temperature to 4°C, collecting the product in the reactor and centrifuging it at 10000 r / min for 20 min to collect the precipitate.

[0018] In another preferred embodiment, the method for preparing the sustained-release particles comprises the following steps: adding biological enzymes, EDTA, and glycerol monoglyceride to a polylactic acid solution to form a polylactic acid mixed solution, adding the polylactic acid mixed solution to a polyvinyl alcohol aqueous solution, stirring thoroughly, homogenizing under high pressure, and spray drying to prepare sustained-release particles.

[0019] In another preferred embodiment, the preparation method of the sustained-release granules comprises the following steps: dissolving polylactic acid, polyethylene glycol and polybutylene succinate in a mixture of dichloromethane and ethanol, stirring to obtain a mixed solution, crushing the biological enzyme, EDTA and glycerol monoglyceride to 100 mesh, using a disc granulator to form particles with a particle size of 2 mm, placing the particles in a coating machine, uniformly spraying the mixed solution on the surface of the particles by a high-pressure spray gun, and drying by air blast at room temperature to prepare the sustained-release granules.

[0020] Compared with the prior art, the present invention has the following advantages and technical effects:

[0021] The grape drying-accelerating agent prepared by the invention uses a biological enzyme method to degrade the wax layer of grapes, the reaction conditions are mild, and the waste liquid can be discharged without being treated.

[0022] In a preferred production method of the drying accelerator of the present invention, a slow-release production technology is adopted to gradually release the effective ingredients in the drying accelerator, so that the effective ingredients remain stable during a certain production process, thereby ensuring the quality of the product.

[0023] In the preferred solution of the present invention, automatic indication technology is adopted to prompt the replenishment of the drying accelerator through the color change of the drying accelerator solution, thereby improving production efficiency and product stability. DETAILED DESCRIPTION

[0024] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0025] It should be understood that the terms described in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0026] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0027] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to those skilled in the art. The present application description and examples are exemplary only.

[0028] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0029] The normal temperature of the present invention refers to 25±2°C.

[0030] The commercially available grape drying agent used in the present invention is a compound grape drying agent of Izimu brand (Xinjiang Huipu Horticulture New Technology Company), whose components include potassium carbonate, sodium hydroxide, ethyl oleate, sodium dodecylbenzene sulfonate, sodium tripolyphosphate, alcohol, chelating agent and the like.

[0031] Example 1

[0032] Evenly mix 5.59 kg of dipotassium hydrogen phosphate, 0.41 kg of potassium dihydrogen phosphate, 120,000 units of alkaline lipase, 40,000 units of pancreatic enzyme, 0.8 kg of disodium ethylenediaminetetraacetic acid and 0.5 kg of monoglyceride, dissolve in 1,000 kg of water, fully dissolve and mix, soak each bunch of grapes in the mixed solution for 1 minute, take out and drain, and then transfer to the drying room for drying. A total of 12 tons of grapes have been processed for drying.

[0033] When the drying is almost finished, the drying condition of the grapes is observed every day, and the drying time of the raisins, the uniformity of the drying time of the raisins and the proportion of green raisins are recorded and calculated (the experimental results are shown in Table 1).

[0034] Example 2

[0035] Evenly mix 11.18 kg of dipotassium hydrogen phosphate, 0.82 kg of potassium dihydrogen phosphate, 160,000 units of alkaline lipase, 60,000 units of pancreatic enzyme, 0.8 kg of disodium ethylenediaminetetraacetic acid and 0.5 kg of monoglyceride, dissolve in 1,000 kg of water, fully dissolve and mix, soak each bunch of grapes in the mixed solution for 1 minute, take out and drain, and then transfer to the drying room for drying. A total of 12 tons of grapes have been processed for drying.

[0036] When the drying is almost over, the drying condition of the grapes is observed every day, and the raisin drying time, raisin homogenization time and the proportion of green raisins are recorded and calculated (the experimental results are shown in Table 1).

[0037] Example 3

[0038] Same as Example 1, except that phenolphthalein was added, and the specific operation was as follows:

[0039] Evenly mix 5.59 kg of dipotassium hydrogen phosphate, 0.41 kg of potassium dihydrogen phosphate, 120,000 units of alkaline lipase, 40,000 units of pancreatic enzyme, 0.8 kg of disodium ethylenediaminetetraacetic acid, 0.5 kg of monoglyceride and 8 g of phenolphthalein, dissolve in 1,000 kg of water, fully dissolve and mix, soak each bunch of grapes in the mixed solution for 1 minute, take out and drain, and then transfer to the drying room for drying. When the solution changes from purple-red to colorless, it is necessary to supplement the above mixed solution in an appropriate amount until the mixed solution returns to purple-red, continue the above soaking treatment, and a total of 12 tons of grapes are processed for drying.

[0040] When the drying is almost over, the drying condition of the grapes is observed every day, and the raisin drying time, raisin homogenization time and the proportion of green raisins are recorded and calculated (the experimental results are shown in Table 1).

[0041] Example 4

[0042] The same as Example 1, except that neutral red is added, the specific operation is as follows:

[0043] Evenly mix 5.59 kg of dipotassium hydrogen phosphate, 0.41 kg of potassium dihydrogen phosphate, 120,000 units of alkaline lipase, 40,000 units of pancreatic enzyme, 0.8 kg of disodium ethylenediaminetetraacetic acid, 0.5 kg of monoglyceride and 6 g of neutral red, dissolve in 1,000 kg of water, fully dissolve and mix, soak each bunch of grapes in the mixed solution for 1 minute, take out and drain, and then transfer to the drying room for drying. When the solution changes from bright yellow to red, it is necessary to supplement the above mixed solution in an appropriate amount until the mixed solution returns to bright yellow, continue the above soaking treatment, and a total of 12 tons of grapes are processed for drying.

[0044] When the drying is almost over, the drying condition of the grapes is observed every day, and the raisin drying time, raisin homogenization time and the proportion of green raisins are recorded and calculated (the experimental results are shown in Table 1).

[0045] Example 5

[0046] Same as Example 1, except that phenol red was added, and the specific operation was as follows:

[0047] Evenly mix 5.59 kg of dipotassium hydrogen phosphate, 0.41 kg of potassium dihydrogen phosphate, 120,000 units of alkaline lipase, 40,000 units of pancreatic enzyme, 0.8 kg of disodium ethylenediaminetetraacetic acid, 0.5 kg of monoglyceride and 7 g of phenol red, dissolve in 1,000 kg of water, fully dissolve and mix, soak each bunch of grapes in the mixed solution for 1 minute, take out and drain, and then transfer to the drying room for drying. When the solution changes from red to yellow, it is necessary to replenish the above mixed solution until the mixed solution returns to red, and continue the above soaking treatment. A total of 12 tons of grapes have been processed for drying.

[0048] When the drying is almost over, the drying condition of the grapes is observed every day, and the raisin drying time, raisin homogenization time and the proportion of green raisins are recorded and calculated (the experimental results are shown in Table 1).

[0049] Example 6

[0050] Same as Example 1, except that cresol red was added, and the specific operation was as follows:

[0051] Evenly mix 5.59 kg of dipotassium hydrogen phosphate, 0.41 kg of potassium dihydrogen phosphate, 120,000 units of alkaline lipase, 40,000 units of pancreatic enzyme, 0.8 kg of disodium ethylenediaminetetraacetic acid, 0.5 kg of monoglyceride and 6 g of cresol red, dissolve in 1,000 kg of water, fully dissolve and mix, soak each bunch of grapes in the mixed solution for 1 minute, take out and drain, and then transfer to the drying room for drying. When the solution changes from purple-red to bright yellow, it is necessary to replenish the above mixed solution until the mixed solution returns to purple-red, and continue the above soaking treatment. A total of 12 tons of grapes have been processed for drying.

[0052] When the drying is almost over, the drying condition of the grapes is observed every day, and the raisin drying time, raisin homogenization time and the proportion of green raisins are recorded and calculated (the experimental results are shown in Table 1).

[0053] Example 7

[0054] S1. Dissolve 75g of polyvinyl alcohol with 5kg of deionized water to prepare a polyvinyl alcohol aqueous solution with a concentration of 1.5%; dissolve 160g of polylactic acid in 2kg of dichloromethane to prepare a polylactic acid solution; add 160,000 units of alkaline protease, 60,000 units of pancreatic enzyme, 0.8kg of ethylenediaminetetraacetic acid and 0.5kg of glycerol monoglyceride to the prepared polylactic acid solution, and stir for 30min at 1000r / min to form a polylactic acid mixed solution. Inject the polylactic acid mixed solution into the polyvinyl alcohol solution in the reactor through a microtube, and keep the reactor stirring at 1000r / min, then control the pressure in the reactor to 0.05MPa, the temperature to 40°C, stir at 400r / min for 10min, then centrifuge at 4°C and 10000r / min for 20min, collect the precipitate, wash it with deionized water 5 times the mass of the precipitate, and repeat the above centrifugation and washing process 3 times. The collected precipitate is freeze-dried to obtain sustained-release particles.

[0055] S2. Evenly mix 5.59 kg of dipotassium hydrogen phosphate, 0.41 kg of potassium dihydrogen phosphate and the above-mentioned slow-release particles, dissolve them in 1000 kg of water, fully dissolve and mix them, soak each bunch of grapes in the obtained mixed solution for 1 minute, take them out and drain them, and then transfer them to the drying room for drying. A total of 12 tons of grapes have been processed for drying.

[0056] When the drying is almost over, the drying condition of the grapes is observed every day, and the raisin drying time, raisin homogenization time and the proportion of green raisins are recorded and calculated (the experimental results are shown in Table 1).

[0057] Example 8

[0058] S1. Dissolve 75g of polyvinyl alcohol with 5kg of deionized water to prepare a polyvinyl alcohol aqueous solution with a concentration of 1.5%; dissolve 160g of polylactic acid in 2kg of dichloromethane to prepare a polylactic acid solution; add 200,000 units of alkaline protease, 90,000 units of pancreatin, 0.9kg of ethylenediaminetetraacetic acid and 0.7kg of glycerol monoglyceride to the prepared polylactic acid solution, and stir for 30min at 1000r / min to form a polylactic acid mixed solution. Inject the polylactic acid mixed solution into the polyvinyl alcohol solution in the reactor through a microtube, and keep the reactor stirring at 1000r / min, control the pressure in the reactor to 0.05MPa, then heat to 40°C, stir at 400r / min for 10min, then cool to 4°C, centrifuge at 10000r / min for 20min, collect the precipitate, wash with deionized water 5 times the mass of the precipitate, and repeat the above centrifugation and washing process 3 times. The collected precipitate was freeze-dried to obtain sustained-release particles.

[0059] S2. Evenly mix 5.59 kg of dipotassium hydrogen phosphate, 0.41 kg of potassium dihydrogen phosphate and the above-mentioned slow-release particles, dissolve them in 1000 kg of water, fully dissolve and mix them, soak each bunch of grapes in the mixed solution for 1 minute, take them out and drain them, and then transfer them to the drying room for drying. A total of 12 tons of grapes have been processed for drying.

[0060] When the drying is almost over, the drying condition of the grapes is observed every day, and the raisin drying time, raisin homogenization time and the proportion of green raisins are recorded and calculated (the experimental results are shown in Table 1).

[0061] Example 9

[0062] S1. Dissolve 75g of polyvinyl alcohol in 5kg of deionized water to prepare a polyvinyl alcohol aqueous solution with a concentration of 1.5%; dissolve 160g of polylactic acid in 2kg of dichloromethane to prepare a polylactic acid solution; add 160,000 units of alkaline protease, 60,000 units of pancreatic enzyme, 0.8kg of ethylenediaminetetraacetic acid and 0.5kg of glycerol monoglyceride to the prepared polylactic acid solution, and stir at 1000r / min for 30min to form a polylactic acid mixed solution. Add the polylactic acid mixed solution to the above polyvinyl alcohol aqueous solution, stir well, and then use a high-pressure homogenizer to treat it at a pressure of 30MPa, and then spray dry it at an inlet temperature of 120°C to obtain sustained-release particles;

[0063] S2. Evenly mix 5.59 kg of dipotassium hydrogen phosphate, 0.41 kg of potassium dihydrogen phosphate and the above-mentioned slow-release particles, dissolve them in 1000 kg of water, fully dissolve and mix them, soak each bunch of grapes in the mixed solution for 1 minute, take them out and drain them, and then transfer them to the drying room for drying. A total of 12 tons of grapes have been processed for drying.

[0064] When the drying is almost over, the drying condition of the grapes is observed every day, and the raisin drying time, raisin homogenization time and the proportion of green raisins are recorded and calculated (the experimental results are shown in Table 1).

[0065] Example 10

[0066] S1. 700g of polylactic acid, 100g of polyethylene glycol and 200g of polybutylene succinate are dissolved in 10L of a mixture of dichloromethane and ethanol (the volume fraction of dichloromethane is 70%; the volume fraction of ethanol is 30%), and stirred at 1000r / min for 30min to obtain a mixed solution. 160000 units of alkaline protease, 60000 units of pancreatin, 0.8kg of ethylenediaminetetraacetic acid and 0.5kg of glycerol monoglyceride are mixed, crushed to 100 mesh, and made into particles with a particle size of 2mm using a disc granulator. The particles are placed in a coating machine, and the mixed solution is evenly sprayed on the surface of the particles by a high-pressure spray gun. The amount of the mixed solution used is 10% of the mass of the particles, and the sustained-release particles are dried at room temperature until the moisture content is below 14%.

[0067] S2. Evenly mix 5.59 kg of dipotassium hydrogen phosphate, 0.41 kg of potassium dihydrogen phosphate and the above-mentioned slow-release particles, dissolve them in 1000 kg of water, fully dissolve and mix them, soak each bunch of grapes in the mixed solution for 1 minute, take them out and drain them, and then transfer them to the drying room for drying. A total of 12 tons of grapes have been processed for drying.

[0068] When the drying is almost over, the drying condition of the grapes is observed every day, and the raisin drying time, raisin homogenization time and the proportion of green raisins are recorded and calculated (the experimental results are shown in Table 1).

[0069] Embodiment 11

[0070] S1. Same as Example 7;

[0071] S2. Evenly mix 5.59 kg of dipotassium hydrogen phosphate, 0.41 kg of potassium dihydrogen phosphate, 8 g of phenolphthalein and the above-mentioned slow-release particles, dissolve them in 1000 kg of water, fully dissolve and mix them, soak each bunch of grapes in the mixed solution for 1 minute, take them out and drain them, and then transfer them to the drying room for drying. When the solution changes from purple-red to colorless, it is necessary to add an appropriate amount of the above-mentioned mixed solution until the mixed solution returns to purple-red. Continue the above-mentioned soaking treatment, and a total of 12 tons of grapes have been processed for drying.

[0072] When the drying is almost over, the drying condition of the grapes is observed every day, and the raisin drying time, raisin homogenization time and the proportion of green raisins are recorded and calculated (the experimental results are shown in Table 1).

[0073] Example 12

[0074] S1. Same as Example 9;

[0075] S2. Evenly mix 5.59 kg of dipotassium hydrogen phosphate, 0.41 kg of potassium dihydrogen phosphate, 8 g of phenolphthalein and the above-mentioned slow-release particles, dissolve them in 1000 kg of water, fully dissolve and mix them, soak each bunch of grapes in the mixed solution for 1 minute, take them out and drain them, and then transfer them to the drying room for drying. When the solution changes from purple-red to colorless, it is necessary to add an appropriate amount of the above-mentioned mixed solution until the mixed solution returns to purple-red, and continue the above-mentioned soaking treatment. A total of 12 tons of grapes have been processed for drying.

[0076] When the drying is almost over, the drying condition of the grapes is observed every day, and the raisin drying time, raisin homogenization time and the proportion of green raisins are recorded and calculated (the experimental results are shown in Table 1).

[0077] Embodiment 13

[0078] S1. Same as Example 9;

[0079] S2. Evenly mix 5.59 kg of dipotassium hydrogen phosphate, 0.41 kg of potassium dihydrogen phosphate, 6 g of neutral red and the above-mentioned slow-release particles, dissolve them in 1000 kg of water, fully dissolve and mix them, soak each bunch of grapes in the mixed solution for 1 minute, take them out and drain them, and then transfer them to the drying room for drying. When the solution changes from bright yellow to red, it is necessary to add an appropriate amount of the above-mentioned mixed solution until the mixed solution returns to bright yellow. Continue the above-mentioned soaking treatment, and a total of 12 tons of grapes have been processed for drying.

[0080] When the drying is almost over, the drying condition of the grapes is observed every day, and the raisin drying time, raisin homogenization time and the proportion of green raisins are recorded and calculated (the experimental results are shown in Table 1).

[0081] Embodiment 14

[0082] S1. Same as Example 9;

[0083] S2. Evenly mix 5.59 kg of dipotassium hydrogen phosphate, 0.41 kg of potassium dihydrogen phosphate, 7 g of phenol red and the above-mentioned slow-release particles, dissolve them in 1000 kg of water, fully dissolve and mix them, soak each bunch of grapes in the mixed solution for 1 minute, take them out and drain them, and then transfer them to the drying room for drying. When the solution changes from red to yellow, it is necessary to replenish the above-mentioned mixed solution until the mixed solution returns to red. Continue the above-mentioned soaking treatment, and a total of 12 tons of grapes have been processed for drying.

[0084] When the drying is almost over, the drying condition of the grapes is observed every day, and the raisin drying time, raisin homogenization time and the proportion of green raisins are recorded and calculated (the experimental results are shown in Table 1).

[0085] Embodiment 15

[0086] S1. Same as Example 9;

[0087] S2. Evenly mix 5.59 kg of dipotassium hydrogen phosphate, 0.41 kg of potassium dihydrogen phosphate, 6 g of cresol red and the above-mentioned slow-release particles, dissolve them in 1000 kg of water, fully dissolve and mix them, soak each bunch of grapes in the mixed solution for 1 minute, take them out and drain them, and then transfer them to the drying room for drying. When the solution changes from purple-red to bright yellow, it is necessary to replenish the above-mentioned mixed solution until the mixed solution returns to purple-red, and continue the above-mentioned soaking treatment. A total of 12 tons of grapes have been processed for drying.

[0088] When the drying is almost over, the drying condition of the grapes is observed every day, and the raisin drying time, raisin homogenization time and the proportion of green raisins are recorded and calculated (the experimental results are shown in Table 1).

[0089] Example 16

[0090] S1. Same as Example 10;

[0091] S2. Evenly mix 5.59 kg of dipotassium hydrogen phosphate, 0.41 kg of potassium dihydrogen phosphate, 8 g of phenolphthalein and the above-mentioned slow-release particles, dissolve them in 1000 kg of water, fully dissolve and mix them, soak each bunch of grapes in the mixed solution for 1 minute, take them out and drain them, and then transfer them to the drying room for drying. When the solution changes from purple-red to colorless, it is necessary to add an appropriate amount of the above-mentioned mixed solution until the mixed solution returns to purple-red, and continue the above-mentioned soaking treatment. A total of 12 tons of grapes have been processed for drying.

[0092] When the drying is almost over, the drying condition of the grapes is observed every day, and the raisin drying time, raisin homogenization time and the proportion of green raisins are recorded and calculated (the experimental results are shown in Table 1).

[0093] Comparative Example 1

[0094] Dissolve 10 kg of commercially available grape drying agent in 1000 kg of water, fully dissolve and mix, soak each bunch of grapes in the mixed solution for 1 minute, take out and drain, and then transfer to the drying room for drying. A total of 12 tons of grapes were processed for drying.

[0095] When the drying is almost over, the drying condition of the grapes is observed every day, and the raisin drying time, raisin homogenization time and the proportion of green raisins are recorded and calculated (the experimental results are shown in Table 1).

[0096] The evaluation method for raisin quality is as follows, and the evaluation results are shown in Table 1.

[0097] 1. Raisin Drying Time

[0098] The drying time of raisins is the time from the grapes entering the drying room to the time when the raisins are dried and obtained, and the time length is expressed in days. Among them, raisins refer to raisins with a moisture content of ≤14%.

[0099] 2. Raisin homogenization time

[0100] In the drying room, record the raisin drying time taken for raisins at different positions to reach the standard of moisture content ≤ 14%. The difference between the maximum and minimum raisin drying time is the raisin homogenization time.

[0101] 3. Green glucose dry ratio

[0102] Raisin products are divided into three grades: green, yellow and red. The proportion of green raisins is the mass of green raisins divided by the total mass of raisins. The value is expressed as a percentage. The higher the proportion of green raisins, the better the quality of the raisins.

[0103] Table 1 Raisin quality evaluation results

[0104]

[0105]

[0106] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A grape drying agent, characterized in that: The raw materials include biological enzymes, dipotassium hydrogen phosphate, potassium dihydrogen phosphate, EDTA and monoglyceride.

2. The grape drying agent according to claim 1, characterized in that The raw material also includes an indicator.

3. A method for producing the grape drying accelerator according to claim 1, characterized in that: The method comprises the following steps: dissolving a uniform mixture of biological enzyme, dipotassium hydrogen phosphate, potassium dihydrogen phosphate, EDTA and glycerol monoglyceride in water to prepare the grape drying agent.

4. The method for producing the grape drying accelerator according to claim 3, characterized in that: The biological enzymes include alkaline lipase and pancreatic enzymes, and the ratio of the alkaline lipase activity to the pancreatic enzyme activity is (1-3):

1.

5. A method for producing the grape drying-accelerating agent according to claim 1, characterized in that: The method comprises the following steps: dissolving a uniform mixture of dipotassium hydrogen phosphate, potassium dihydrogen phosphate and slow-release particles containing biological enzymes in water, fully dissolving and mixing, and preparing the grape drying agent.

6. The method for producing the grape drying accelerator according to claim 5, characterized in that: The biological enzymes include alkaline lipase and pancreatic enzymes, and the ratio of the alkaline enzyme activity to the pancreatic enzyme activity is (2.2-2.6):

1.

7. The method for producing the grape drying accelerator according to claim 6, characterized in that: The preparation method of the sustained-release granules comprises the following steps: adding biological enzyme, EDTA and glycerol monoglyceride into a polylactic acid solution to form a polylactic acid mixed solution, adding the polylactic acid mixed solution into a polyvinyl alcohol aqueous solution, stirring for reaction, collecting precipitates, washing, and freeze-drying to prepare sustained-release granules.

8. The method for producing the grape drying accelerator according to claim 7, characterized in that: The specific operation of the stirring reaction is: controlling the pressure in the reactor to 0.05MPa, stirring the reactor at 1000r / min, raising the temperature to 40°C, then reducing the stirring reactor speed to 400r / min, maintaining for 10min, reducing the reactor temperature to 4°C, collecting the product in the reactor and centrifuging it at 10000r / min for 20min to collect the precipitate.

9. The method for producing the grape drying-accelerating agent according to claim 6, characterized in that: The preparation method of the sustained-release granules comprises the following steps: adding biological enzyme, EDTA and glycerol monoglyceride into a polylactic acid solution to form a polylactic acid mixed solution, adding the polylactic acid mixed solution into a polyvinyl alcohol aqueous solution, fully stirring, high-pressure homogenizing and then spray drying to prepare sustained-release granules.

10. The method for producing the grape drying accelerator according to claim 6, characterized in that: The preparation method of the sustained-release granules comprises the following steps: dissolving polylactic acid, polyethylene glycol and polybutylene succinate in a mixed solution of dichloromethane and ethanol, stirring to obtain a mixed solution, crushing biological enzymes, EDTA and glycerol monoglyceride to 100 meshes, using a disc granulator to form granules with a particle size of 2 mm, placing the granules in a coating machine, uniformly spraying the mixed solution on the surface of the granules by a high-pressure spray gun, and drying by air blast at room temperature to prepare the sustained-release granules.

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