Method and device for prolonging storage period of milled rice with embryo

Abstract

The invention discloses a method and a device for prolonging the storage period of milled rice with embryo, and relates to the technical field of prolonging the storage period of the milled rice with embryo. Comprising the following steps: treating milled rice with embryo by adopting cold plasmas, soaking the milled rice with embryo treated by the cold plasmas in a biological enzyme solution, and realizing degradation balance by optimizing the enzyme concentration and soaking time and controlling the degradation rate, thereby achieving the effects of delaying excessive degradation of lipid and starch in rice grains and improving the quality of the milled rice with embryo. Then a nano coating liquid is prepared from a natural polymer and a natural antioxidant, a coating is formed on the surface of the milled rice with embryo, the coating can provide a protective barrier, the antioxidant is added into the coating liquid, the oxidation resistance of the rice grains is enhanced, the shelf life of the rice grains is prolonged, and finally low-temperature drying is performed, so that the quality of the milled rice with embryo is improved. And the concentration of nitrogen and oxygen in the storage environment of the milled rice with embryo is adjusted by adopting a gas adjusting technology, so that the oxidation reaction speed of the milled rice with embryo is slowed down, and the storage period of the milled rice with embryo is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of extending the storage period of germ rice, and in particular to a method and a device for extending the storage period of germ rice. Background Art

[0002] Cold plasma is produced by ionizing air or a medium at a given voltage to produce active substances such as reactive oxygen, free radicals and charged ions. In the past decade, there have been many studies on cold plasma treatment, such as material processing (including food materials), synthesis of new substances and environmental management. These research results have provided new technologies, methods and processes for industrial development. Among them, the application of cold plasma in food material processing has the advantage of being able to achieve more efficient sterilization at low temperatures without causing damage to food materials.

[0003] Rice is one of the most important staple foods in my country, meeting the basic living needs of the people. Germ rice has a high nutritional value, which not only provides energy but also enriches people's diet. Germ rice is mainly composed of nutrients such as lipids, starch and protein. As one of the rice processing products, germ rice combines the high-quality taste of polished rice with the nutritional value of brown rice. It is increasingly favored by consumers and the market demand is growing.

[0004] However, during the storage process, germ rice is prone to quality deterioration. The quality deterioration of germ rice is both its own physiological change and a natural aging phenomenon. Due to its low processing precision and the presence of the germ, it is easy to have autonomous respiratory metabolic activities during storage, leading to decreased enzyme activity, loss of nutrients, aging, mildew and other quality deterioration phenomena. At present, the research on germ rice is mainly focused on the processing technology of germ rice, while the research on the storage method of germ rice is relatively less.

[0005] In the prior art, publication number CN102948465B discloses a method of combined microwave and hot air treatment to extend the storage of germ rice. By using microwave and hot air combined treatment, the synergistic effect is utilized to efficiently kill the hidden eggs and molds in the rice grains, passivate the lipoxygenase and lipase in the germ rice, and inhibit lipid oxidation; at the same time, chitosan coating and low temperature and high humidity treatment are used to effectively reduce the rice grain burst rate and reduce the loss of nutrients. This method is environmentally friendly and pollution-free for processing germ rice, and the storage period of the product is significantly improved. However, microwave heating may cause uneven temperature distribution inside and outside the rice grains, and some rice grains may be overheated or have hot spots, affecting the treatment effect. The uniformity of hot air treatment depends on air flow. If the air flow is uneven, microorganisms or insect eggs may not be fully killed in some areas. At the same time, the effect of passivating peroxidase and other enzymes in the surface of agricultural products that are prone to food spoilage will also be affected. At the same time, high temperature may cause the loss of nutrients in rice grains, such as the loss of vitamins and fatty acids. Therefore, the combined treatment of microwave and hot air is not only limited in processing efficiency and effectiveness, but may also damage the nutrients in the germ rice, causing unnecessary losses. Summary of the invention

[0006] The object of the present invention is to provide a method for prolonging the storage period of germ rice to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A method for prolonging the storage period of germ rice, comprising the following specific steps:

[0009] The surface impurities of the germ rice to be treated are removed, and the germ rice is treated with cold plasma. The gas type selected for the cold plasma is argon or nitrogen, the flow rate is 5-10L / min, the pressure is 0.1-0.5MPa, the power is 100-300W, and the treatment time is 5-7 minutes;

[0010] A biological enzyme solution having a degradation rate between a maximum degradation threshold value and a minimum degradation threshold value is prepared, and the germ rice treated with cold plasma is immersed in the biological enzyme solution, the temperature of the biological enzyme solution is maintained at 30° C. After the immersion, the germ rice is rinsed once with clean water to remove unreacted enzymes, and the residual enzyme activity on the surface of the germ rice is obtained. Based on the activity, a secondary rinsing time is determined and the secondary rinsing is performed, and the degradation rate is determined based on the enzyme concentration and the immersion time;

[0011] Prepare a nano coating liquid with natural polymers and natural antioxidants, soak the washed germ rice in the coating liquid for coating, and set the soaking time to 20-40 minutes, stirring during the soaking to ensure that the coating liquid is evenly distributed on the surface of the germ rice;

[0012] After soaking, the germ rice is taken out and placed on a sieve or a clean cloth to drain off excess coating liquid, and the germ rice is dried to promote the curing of the coating and ensure that the coating is firmly attached to the surface of the germ rice. At the same time, the moisture content of the germ rice is monitored and a moisture content threshold is set. When the moisture content is lower than the threshold, the drying process is terminated;

[0013] The dried germ rice is stored in a gas-regulated storage container that is injected with a mixture of nitrogen and oxygen and is well sealed.

[0014] Furthermore, the method of treating the germ rice with cold plasma is as follows: treating the germ rice with a low-temperature plasma treatment machine, the low-temperature plasma treatment machine comprising a cold plasma generator and a treatment chamber, uniformly distributing the germ rice on a tray in the treatment chamber, ensuring that there is a spacing between each rice grain, starting the cold plasma generator to generate plasma, checking and adjusting the gas flow rate, wherein the formula for controlling the gas flow rate is:

[0015] Q=V*A

[0016] Where Q is the gas flow rate, V is the gas velocity, and A represents the flow cross-sectional area.

[0017] Furthermore, the biological enzyme solution is configured, lipase and amylase are selected as the treatment enzymes, several groups of different enzyme concentrations and soaking times are set and the corresponding degradation rates are monitored, wherein the corresponding relationship between the degradation rate and the enzyme concentration and the soaking time is expressed as:

[0018] R=k*A α *T β

[0019] Where R is the degradation rate, k is the degradation rate constant, A is the enzyme concentration, T is the immersion time, α and β are the influence index of enzyme concentration on the degradation rate and the influence index of immersion time on the degradation rate, respectively. By setting the threshold, the enzyme concentration and immersion time corresponding to the degradation rate within the threshold range are selected, and the minimum degradation threshold is calibrated to be yz min , the maximum degradation threshold is yz max ;

[0020] The soaked germ rice is rinsed with clean water to remove the unreacted enzyme, wherein the second rinse time is determined according to the formula:

[0021]

[0022] Where, t is the secondary flushing time, C tra is the residual enzyme target activity, C0 is the residual enzyme activity on the surface of germ rice after one washing, and k is the degradation rate constant.

[0023] Furthermore, the nano coating liquid is prepared with natural polymers and natural antioxidants, the natural polymers include gelatin, gum arabic, sodium alginate, the natural antioxidants include rosemary extract, green tea extract or vitamin E, and the prepared nano coating liquid also includes salt and water.

[0024] Furthermore, during the drying process of the germ rice, the temperature is set in the range of 20°C-40°C, the moisture content of the germ rice is monitored, and a moisture content threshold is set. When the moisture content of the germ rice is below the set moisture content threshold, the drying is terminated, wherein the moisture content threshold is set between 10%-12%.

[0025] Furthermore, a mixed gas of nitrogen and oxygen is injected into the gas regulating storage container, wherein the oxygen concentration in the mixed gas components is less than or equal to 2%, and the nitrogen concentration is greater than or equal to 95%.

[0026] The present invention also provides a device for prolonging the storage period of germ rice, and the device for prolonging the storage period of germ rice is used to perform the above-mentioned method for prolonging the storage period of germ rice, comprising:

[0027] The cold plasma sterilization module is used to remove surface impurities from the germ rice to be treated, and treat the germ rice with cold plasma. The gas type selected for the cold plasma is argon or nitrogen, with a flow rate of 5-10L / min, a pressure of 0.1-0.5MPa, a power of 100-300W, and a treatment time of 5-7 minutes;

[0028] A biological enzyme treatment module is used to configure a biological enzyme solution with a degradation rate between a maximum degradation threshold value and a minimum degradation threshold value, soak the germ rice treated with cold plasma in the biological enzyme solution, maintain the temperature of the biological enzyme solution at 30° C., rinse once with clean water after soaking to remove unreacted enzymes, obtain residual enzyme activity on the surface of the germ rice, determine a secondary rinse time based on the activity and perform secondary rinse, wherein the degradation rate is determined based on the enzyme concentration and the soaking time;

[0029] The nano coating coating module is used to prepare a nano coating liquid with natural polymers and natural antioxidants, and put the rinsed germ rice into the coating liquid for coating. The soaking time is set to 20-40 minutes, and stirring is performed during the soaking to ensure that the coating liquid is evenly distributed on the surface of the germ rice.

[0030] The drying and curing module is used to take out the germ rice after the soaking, put it on a screen or a clean cloth, drain off the excess coating liquid, and dry the germ rice to promote the curing of the coating and ensure that the coating is firmly attached to the surface of the germ rice. At the same time, the moisture content of the germ rice is monitored and a moisture content threshold is set. When the moisture content is lower than the threshold, the drying process is terminated;

[0031] The gas storage module is used to store the dried germ rice in a gas-regulated storage container which is injected with a mixed gas of nitrogen and oxygen and is well sealed.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The germ rice is treated with cold plasma, which can achieve more efficient sterilization at low temperature, especially for relatively resistant microorganisms such as spores and fungi, and cold plasma treatment can effectively reduce the loss of nutrients under the condition of maintaining low temperature. At the same time, cold plasma can change the surface properties of rice grains, thereby enhancing their waterproof ability, inhibiting lipid oxidation, and extending the storage period; the germ rice is soaked in biological enzyme liquid, and by optimizing the enzyme concentration and soaking time, the degradation rate can be controlled to a certain extent, the degradation balance can be achieved, and the excessive degradation of lipids and starch in the rice grains can be delayed. The nano coating liquid is configured with natural polymers and natural antioxidants to form a coating on the surface of the germ rice. The coating can provide a protective barrier, control the water absorption and discharge of the rice grains, and slow down the growth of microorganisms. Antioxidants are added to the coating liquid to enhance the anti-oxidation ability of the rice grains, thereby extending the shelf life of the rice grains. Finally, low-temperature drying is carried out, and the nitrogen and oxygen concentrations in the storage environment of the germ rice are adjusted by gas regulation technology, so that the oxidation reaction rate of the germ rice is slowed down and the storage period of the germ rice is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall method flow of the present invention;

[0035] Figure 2 It is a schematic diagram of the overall device module of the present invention. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0037] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] Example:

[0039] See also Figure 1 , the present invention provides a technical solution:

[0040] A method for prolonging the storage period of germ rice, comprising the following specific steps:

[0041] Step 1: remove surface impurities from the germ rice to be treated, and treat the germ rice with cold plasma. The gas type selected for the cold plasma is argon or nitrogen, with a flow rate of 5-10L / min, a pressure of 0.1-0.5MPa, a power of 100-300W, and a treatment time of 5-7 minutes;

[0042] The method for treating germ rice with cold plasma is as follows: treating the germ rice with a low-temperature plasma treatment machine, the low-temperature plasma treatment machine comprising a cold plasma generator and a treatment chamber, uniformly distributing the germ rice on a tray in the treatment chamber, ensuring that there is a gap between each rice grain, starting the cold plasma generator to generate plasma, checking and adjusting the gas flow, wherein the formula for controlling the gas flow is:

[0043] Q=V*A

[0044] Where Q is the gas flow rate, V is the gas velocity, and A represents the flow cross-sectional area.

[0045] The specific operation steps include: ensuring that the cold plasma generator equipment meets food safety standards, can provide stable plasma output, and the processing chamber has good airtightness to safely control gas flow and plasma generation; setting working parameters, including gas type as argon or nitrogen, flow rate of 5-10L / min, pressure of 0.1-0.5MPa, setting appropriate power frequency and power, usually, the frequency is set to 13.56MHz, the power is 100-300 watts, and the processing time is 5-7 minutes; loading germ rice and evenly distributing the germ rice on the tray of the processing chamber, ensuring that there is a certain distance between each rice grain so that the cold plasma can evenly cover each rice grain; starting cold plasma treatment, starting the cold plasma generator, and starting plasma generation. Observe the indicator light and operating status of the equipment to confirm normal operation.

[0046] Step 2: preparing a biological enzyme solution with a degradation rate between a maximum degradation threshold value and a minimum degradation threshold value, soaking the germ rice treated with cold plasma in the biological enzyme solution, maintaining the temperature of the biological enzyme solution at 30° C., rinsing with clean water after soaking to remove unreacted enzymes, obtaining residual enzyme activity on the surface of the germ rice, determining a secondary rinsing time based on the activity and performing secondary rinsing, wherein the degradation rate is determined based on the enzyme concentration and the soaking time;

[0047] The right amount of degradation can remove the indigestible starch and lipids in the rice grains while retaining their main nutrients. The enzymes degrade the starch and lipids in the rice grains to a certain extent to meet the quality and storage stability requirements of the product without causing excessive degradation.

[0048] The biological enzyme solution is configured, lipase and amylase are selected as the treatment enzymes, and lipase and amylase are mixed in a ratio of 2:1 to prepare a 1% enzyme solution. This means that 1 gram of total enzyme is contained in 100 ml of the solution. The biological enzyme solution is configured, lipase and amylase are selected as the treatment enzymes, several groups of different enzyme concentrations and soaking times are set and the corresponding degradation rates are monitored, wherein the corresponding relationship between the degradation rate and the enzyme concentration and the soaking time is expressed as:

[0049] R=k*A α *T β

[0050] In the formula, R is the degradation rate, k is the degradation rate constant, A represents the enzyme concentration, T represents the immersion time, α and β represent the influence index of enzyme concentration on the degradation rate and the influence index of immersion time on the degradation rate respectively; wherein, the method for determining α and β is: design a series of enzyme reaction systems with different concentrations, keep other conditions (such as temperature, pH, substrate concentration, etc.) unchanged, measure the degradation rate at each concentration, use an appropriate mathematical model (such as Michaelis-Mentenkinetics) to fit the data, and obtain the value of α from the fitting results, which can usually be obtained by taking the derivative of the logarithm of the enzyme concentration. The method for determining β is similar, and the values ​​of α and β are usually between 0 and 1.

[0051] By setting the threshold, the enzyme concentration and immersion time corresponding to the degradation rate within the threshold range are selected, and the minimum degradation threshold is calibrated to yz min , the maximum degradation threshold is yz max ; That is, the range of degradation rate is yz min ≤R≤yz max , where the minimum and maximum degradation thresholds can be set according to the storage time required in actual conditions, so as to achieve the storage purpose within the optimal time window.

[0052] Lipase and amylase are enzymes commonly used in the food industry. They can effectively modify and utilize food ingredients under certain conditions. However, when using these enzymes, the safety of their residues to the human body still needs to be considered. Most food-grade enzymes will not cause harm to the human body at reasonable concentrations, and are usually digested and decomposed in the human body without accumulation. Therefore, rinse with clean water after soaking in biological enzyme solution to remove unreacted enzymes;

[0053] The soaked germ rice is rinsed with clean water to remove the unreacted enzyme, wherein the second rinse time is determined according to the formula:

[0054]

[0055] Where, t is the secondary flushing time, C tra is the residual enzyme target activity, C0 is the residual enzyme activity on the surface of germ rice after one washing, and k is the degradation rate constant, where k is greater than 0.

[0056] The residual enzyme activity C0 on the surface of germ rice after one rinse can be obtained through laboratory testing, and the residual enzyme target activity C tra It is usually set based on food safety standards or regulatory requirements.

[0057] Step 3: Prepare a nano coating liquid with natural polymers and natural antioxidants, soak the rinsed germ rice in the coating liquid for coating, and set the soaking time to 20-40 minutes. Stir during the soaking to ensure that the coating liquid is evenly distributed on the surface of the germ rice.

[0058] The nano coating liquid is prepared by using natural polymers and natural antioxidants, wherein the natural polymers include gelatin, gum arabic, and sodium alginate, and the natural antioxidants include rosemary extract, green tea extract or vitamin E. The prepared nano coating liquid also includes salt and water.

[0059] This embodiment adopts a method for preparing a nano coating liquid: the coating liquid ingredients include: 10 grams of gelatin, 5 milliliters of glycerin, 1 milliliter of rosemary extract, 2 grams of salt, and 200 milliliters of water; put 10 grams of gelatin into 50 milliliters of warm water (about 50°C) and let it stand for 5-10 minutes until the gelatin is completely dissolved; add 5 milliliters of glycerin, 1 milliliter of rosemary extract and 2 grams of salt to the dissolved gelatin, and stir evenly; gradually add the remaining 150 milliliters of water to the mixed solution, and continue stirring until a uniform coating liquid is formed.

[0060] Step 4: After soaking, take out the germ rice, put it on a sieve or a clean cloth, drain off the excess coating liquid, and dry the germ rice to promote the curing of the coating and ensure that the coating is firmly attached to the surface of the germ rice. At the same time, monitor the moisture content of the germ rice and set a moisture content threshold. When the moisture content is lower than the threshold, the drying process ends;

[0061] During the drying process of the germ rice, the temperature setting range is 20℃-40℃, low-temperature drying is performed, the moisture content of the germ rice is monitored, and a moisture content threshold is set. When the moisture content of the germ rice is below the set moisture content threshold, the drying is terminated, wherein the moisture content threshold is set between 10%-12%, ensuring that the moisture is controlled within this range, which helps to inhibit mildew and oxidation.

[0062] Step 5: storing the dried germ rice in a gas-regulated storage container that is injected with a mixture of nitrogen and oxygen and is well sealed;

[0063] A mixed gas of nitrogen and oxygen is injected into the gas regulating storage container, wherein the oxygen concentration in the mixed gas is less than or equal to 2% and the nitrogen concentration is greater than or equal to 95%.

[0064] Lowering the oxygen concentration in the container to below 2% can significantly slow down the oxidation reaction and the growth of microorganisms, thereby effectively extending the shelf life of germ rice. The low oxygen environment has an inhibitory effect on the growth of many pests and microorganisms, reducing the risk of biological contamination.

[0065] See also Figure 2The present invention also provides a device for prolonging the storage period of germ rice, wherein the device for prolonging the storage period of germ rice is used to perform the above-mentioned method for prolonging the storage period of germ rice, comprising:

[0066] The cold plasma sterilization module is used to remove surface impurities from the germ rice to be treated, and treat the germ rice with cold plasma. The gas type selected for the cold plasma is argon or nitrogen, with a flow rate of 5-10L / min, a pressure of 0.1-0.5MPa, a power of 100-300W, and a treatment time of 5-7 minutes;

[0067] A biological enzyme treatment module, used for the biological enzyme treatment module, used for configuring a biological enzyme solution with a degradation rate between a maximum degradation threshold value and a minimum degradation threshold value, soaking the germ rice treated with cold plasma in the biological enzyme solution, maintaining the temperature of the biological enzyme solution at 30° C., rinsing with clean water after soaking to remove unreacted enzymes, obtaining residual enzyme activity on the surface of the germ rice, determining a secondary rinsing time based on the activity and performing secondary rinsing, wherein the degradation rate is determined based on the enzyme concentration and the soaking time;

[0068] The nano coating coating module is used to prepare a nano coating liquid with natural polymers and natural antioxidants, and soak the rinsed germ rice in the coating liquid for coating. The soaking time is set to 20-40 minutes, and stirring is performed during the soaking to ensure that the coating liquid is evenly distributed on the surface of the germ rice.

[0069] The drying and curing module is used to take out the germ rice after the soaking, put it on a screen or a clean cloth, drain off the excess coating liquid, and dry the germ rice to promote the curing of the coating and ensure that the coating is firmly attached to the surface of the germ rice. At the same time, the moisture content of the germ rice is monitored and a moisture content threshold is set. When the moisture content is lower than the threshold, the drying process is terminated;

[0070] The gas storage module is used to store the dried germ rice in a gas-regulated storage container which is injected with a mixed gas of nitrogen and oxygen and is well sealed.

[0071] The above formulas are all dimensionless and numerical calculations. The formula is a formula for the most recent real situation obtained by collecting a large amount of data and performing software simulation. The preset parameters in the formula are set by technicians in this field according to actual conditions.

[0072] The above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination thereof. When implemented by software, the above embodiments may be implemented in whole or in part in the form of a computer program product. Those skilled in the art may appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein may be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed by hardware or software methods depends on the specific application and design constraints of the technical solution.

[0073] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, and may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0074] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A method for prolonging the storage period of germ rice, characterized in that: The specific steps include: The surface impurities of the germ rice to be treated are removed, and the germ rice is treated with cold plasma. The gas type selected for the cold plasma is argon or nitrogen, the flow rate is 5-10L / min, the pressure is 0.1-0.5MPa, the power is 100-300W, and the treatment time is 5-7 minutes; A biological enzyme solution having a degradation rate between a maximum degradation threshold value and a minimum degradation threshold value is prepared, and the germ rice treated with cold plasma is immersed in the biological enzyme solution, the temperature of the biological enzyme solution is maintained at 30° C. After the immersion, the germ rice is rinsed once with clean water to remove unreacted enzymes, and the residual enzyme activity on the surface of the germ rice is obtained. Based on the activity, a secondary rinsing time is determined and the secondary rinsing is performed, and the degradation rate is determined based on the enzyme concentration and the immersion time; Prepare a nano coating liquid with natural polymers and natural antioxidants, soak the washed germ rice in the coating liquid for coating, and set the soaking time to 20-40 minutes, stirring during the soaking to ensure that the coating liquid is evenly distributed on the surface of the germ rice; After soaking, the germ rice is taken out and placed on a sieve or a clean cloth to drain off excess coating liquid, and the germ rice is dried to promote the curing of the coating and ensure that the coating is firmly attached to the surface of the germ rice. At the same time, the moisture content of the germ rice is monitored and a moisture content threshold is set. When the moisture content is lower than the threshold, the drying process is terminated; The dried germ rice is stored in a gas-regulated storage container that is injected with a mixture of nitrogen and oxygen and is well sealed.

2. A method for prolonging the storage period of germ rice according to claim 1, characterized in that: The method for treating germ rice with cold plasma is as follows: treating the germ rice with a low-temperature plasma treatment machine, the low-temperature plasma treatment machine comprising a cold plasma generator and a treatment chamber, uniformly distributing the germ rice on a tray in the treatment chamber, ensuring that there is a gap between each rice grain, starting the cold plasma generator to generate plasma, checking and adjusting the gas flow, wherein the formula for controlling the gas flow is: Q=V*A Where Q is the gas flow rate, V is the gas velocity, and A represents the flow cross-sectional area.

3. A method for prolonging the storage period of germ rice according to claim 2, characterized in that: The biological enzyme solution is selected from lipase and amylase, and the calculation formula of the degradation rate is as follows: R=k*A α *T β Where R is the degradation rate, k is the degradation rate constant, A is the enzyme concentration, T is the immersion time, α and β are the influence index of enzyme concentration on the degradation rate and the influence index of immersion time on the degradation rate, respectively. By setting the threshold, the enzyme concentration and immersion time corresponding to the degradation rate within the threshold range are selected, and the minimum degradation threshold is calibrated to be yz min , the maximum degradation threshold is yz max ; The soaked germ rice is rinsed with clean water to remove the unreacted enzyme, wherein the second rinse time is determined according to the formula: Where, t is the secondary flushing time, C tra is the residual enzyme target activity, C0 is the residual enzyme activity on the surface of germ rice after one washing, and k is the degradation rate constant.

4. A method for prolonging the storage period of germ rice according to claim 1, characterized in that: The nano coating liquid is prepared by using natural polymers and natural antioxidants, wherein the natural polymers include gelatin, gum arabic, and sodium alginate, and the natural antioxidants include rosemary extract, green tea extract or vitamin E. The prepared nano coating liquid also includes salt and water.

5. A method for prolonging the storage period of germ rice according to claim 4, characterized in that: During the drying process of the germ rice, the temperature setting range is 20°C-40°C, the moisture content of the germ rice is monitored, and a moisture content threshold is set. When the moisture content of the germ rice is below the set moisture content threshold, the drying is terminated, wherein the moisture content threshold is set between 10%-12%.

6. The method for prolonging the storage period of germ rice according to claim 1, characterized in that: A mixed gas of nitrogen and oxygen is injected into the gas regulating storage container, wherein the oxygen concentration in the mixed gas components is less than or equal to 2%, and the nitrogen concentration is greater than or equal to 95%.

7. A device for extending the storage period of germ rice, characterized in that: The device for prolonging the storage period of germ rice is used to implement the method for prolonging the storage period of germ rice according to any one of claims 1 to 6, comprising: The cold plasma sterilization module is used to remove surface impurities from the germ rice to be treated, and treat the germ rice with cold plasma. The gas type selected for the cold plasma is argon or nitrogen, with a flow rate of 5-10L / min, a pressure of 0.1-0.5MPa, a power of 100-300W, and a treatment time of 5-7 minutes; A biological enzyme treatment module is used to configure a biological enzyme solution with a degradation rate between a maximum degradation threshold value and a minimum degradation threshold value, soak the germ rice treated with cold plasma in the biological enzyme solution, maintain the temperature of the biological enzyme solution at 30° C., rinse once with clean water after soaking to remove unreacted enzymes, obtain residual enzyme activity on the surface of the germ rice, determine a secondary rinse time based on the activity and perform secondary rinse, wherein the degradation rate is determined based on the enzyme concentration and the soaking time; The nano coating coating module is used to prepare a nano coating liquid with natural polymers and natural antioxidants, and soak the rinsed germ rice in the coating liquid for coating. The soaking time is set to 20-40 minutes, and stirring is performed during the soaking to ensure that the coating liquid is evenly distributed on the surface of the germ rice. The drying and curing module is used to take out the germ rice after the soaking, put it on a screen or a clean cloth, drain off the excess coating liquid, and dry the germ rice to promote the curing of the coating and ensure that the coating is firmly attached to the surface of the germ rice. At the same time, the moisture content of the germ rice is monitored and a moisture content threshold is set. When the moisture content is lower than the threshold, the drying process is terminated; The gas storage module is used to store the dried germ rice in a gas-regulated storage container which is injected with a mixed gas of nitrogen and oxygen and is well sealed.

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