Preparation method of high amylose corn starch

Abstract

The invention relates to the field of food processing, in particular to a preparation method of high-amylose corn starch, which comprises the following steps: selecting corn seeds; selecting a planting base; performing corn field management; corn harvesting and storage; color sorting and cleaning; performing cleaning; peeling and degerming; performing crushing; performing drying; performing grinding; and sub-packaging. The high-amylose corn starch has the advantages that the prepared high-amylose corn starch contains a large amount of dietary fibers and more than 40% of natural resistant starch, has the effects of treating fatty liver, reducing blood fat and blood sugar, effectively reducing weight and stabilizing weight without rebounding, also can regulate intestinal flora, and has the effects of reducing weight, regulating blood sugar, promoting health of heart and cerebral vessels, reducing the attack risk of diabetes and improving the immunity of the human body. The health-care food has the effects of lowering lipid and cholesterol, promoting intestinal health, enhancing body resistance and the like, and has good popularization prospect and economic value.

Description

Technical Field

[0001] The invention relates to the field of food processing, and in particular to a method for preparing high-amylose corn starch. Background Art

[0002] As people's living standards improve and their health awareness increases, the requirements for food quality and nutritional value are getting higher and higher. As a product with special nutritional value and broad application prospects, high-amylose corn starch is receiving more and more attention.

[0003] In the current market environment, the traditional method of making corn starch has some obvious defects. First, in terms of raw material processing, the traditional method is often not strict enough in screening corn, and impurities such as discolored grains, moldy grains, and broken grains cannot be effectively removed, which not only affects the appearance quality of starch, but also may bring safety hazards. For example, some existing technologies only use simple screening equipment, which cannot fully identify and analyze the color, shape, size and other characteristics of corn, resulting in a large amount of impurities remaining. Moreover, the incomplete removal of stones, magnetic impurities, etc. in corn affects the subsequent processing and the quality of starch.

[0004] In the cleaning process, traditional methods usually use a single cleaning method, which has poor cleaning effect and cannot fully remove dirt and pesticide residues on the surface of corn. Water temperature control is not accurate, and there is no scientific standard for the number and time of cleaning, which makes it difficult to ensure the safety of the final product. For example, some cleaning methods simply rinse the corn with water, which cannot effectively remove pesticide residues and does not meet consumers' requirements for healthy food.

[0005] In the process of peeling and removing germ, the peeling rate of traditional technology is difficult to accurately control, and the effect of removing germ is not ideal. This will cause impurities and pigments in the corn husk and the germ part to have a greater impact on the purity of starch. Some existing methods either do not peel thoroughly or fail to completely remove the germ during the process of removing germ, which affects the quality of starch and subsequent applications.

[0006] In the crushing and grinding process, traditional processes often cannot accurately control the particle size of starch, resulting in poor solubility and taste. In addition, the insufficient application of multiple crushing and screening techniques makes the uniformity of starch particles poor, affecting the consistency of product quality. For example, some common crushing equipment cannot crush starch to a suitable particle size, affecting its application effect in the food and industrial fields.

[0007] In terms of drying and packaging, traditional methods have deficiencies in the sealing and safety of drying equipment, which can easily cause heat loss and fire accidents. At the same time, the thickness of the starch is not accurately controlled, and uniform drying cannot be guaranteed, and the moisture content is difficult to reduce to an appropriate level. During the packaging process, there is a lack of standardized operations, and the weight and error of each bag cannot be strictly controlled. The sealing and freshness of the packaging are not good enough. For example, some traditional drying equipment is prone to local overheating or insufficient drying, resulting in unstable starch quality. During packaging, loose packaging can easily cause starch oxidation and deterioration.

[0008] In terms of corn planting, there are also some problems with the existing planting methods. The seed selection standards are not strict enough, and the purity, germination rate and water content of the seeds cannot be effectively guaranteed, which will affect the growth and yield of corn. The selection of planting bases lacks scientificity, and the fertility, drainage, pH, etc. of the soil cannot meet the growth needs of corn, and the climatic conditions cannot provide a good growth environment for corn. For example, the planting bases selected in some areas have poor soil, low organic matter content, and insufficient nutrients such as total nitrogen, available phosphorus, and available potassium, resulting in poor growth of corn.

[0009] Unscientific field management, inappropriate sowing time, and unreasonable fertilization and irrigation. For example, in terms of fertilization, targeted fertilization cannot be carried out according to the growth and development stage of corn, resulting in insufficient or excessive nutrient supply. In terms of irrigation, the moisture of the soil cannot be reasonably controlled, excessive watering during the seedling stage or lack of water during the critical growth period will affect the growth and yield of corn.

[0010] Harvest and storage are not standardized, the harvest timing is not accurate, the drying is not timely, and the storage conditions are not good. For example, some corn is harvested when the moisture content is too high, which makes the corn easy to mold and sprout. When storing, it is not possible to avoid mixing with toxic, harmful, and odorous substances, and the storage conditions are not checked regularly, which can easily cause the quality of corn to deteriorate.

[0011] In summary, the existing corn starch production method and corn planting method have many defects and cannot meet the market demand for high-quality high-amylose corn starch. Therefore, the development of a new high-amylose corn starch production method and a scientific corn planting method has important practical significance and economic value. It is against this background that the present invention comes into being. Through strict color sorting and cleaning, comprehensive and detailed cleaning, precise peeling and germ removal, crushing and grinding, scientific drying and standardized packaging and other production method steps, as well as strict seed selection, scientific selection of planting bases, reasonable field management and standardized harvesting and storage of corn planting methods, a reliable technical guarantee is provided for the production of high-quality high-amylose corn starch. Summary of the invention

[0012] In order to overcome the deficiencies of the prior art, the present application provides a method for preparing high-amylose corn starch.

[0013] On the one hand, the present application provides the following scheme:

[0014] A method for preparing high-amylose corn starch comprises the following steps:

[0015] 1) Color sorting and cleaning: Use an optical color sorter to sort the corn; by identifying and analyzing the color, shape and size characteristics of the corn, filter out impurities such as discolored kernels, moldy kernels and damaged kernels; use a vibrating screen, stone remover and magnetic separator to clean the corn after color sorting to remove impurities and dust;

[0016] 2) Cleaning: Use a cleaning machine to clean the corn by spraying, soaking and stirring to clean the dirt and pesticide residues on the surface of the corn; put the corn into the cleaning machine, add clean water, and control the water temperature between 10-20°C; wash 2-3 times, each cleaning time is 5-10 minutes;

[0017] 3) Peeling and removing germs: The corn is peeled by a peeling machine; the peeling machine removes the outer skin of the corn by friction and extrusion; the degree of peeling is controlled according to product requirements, and the peeling rate is between 80% and 90%; the peeled corn is degermed by a germ separator or manual selection; the corn kernels after degerming are washed again to remove the remaining germ and impurities;

[0018] 4) Crushing: Use a roller mill to crush the peeled and germ-free corn kernels into fine powder; select screens of different specifications according to the particle size requirements of the product; the particle size of high-amylose corn starch is between 80-120 mesh;

[0019] 5) Drying: Use drying equipment to dry the high-amylose corn starch; ensure the sealing and safety of the drying equipment to prevent heat loss and fire accidents; evenly spread the crushed high-amylose corn starch on the tray or conveyor belt of the drying equipment with a thickness of 2-3 cm; reduce the water content of the high-amylose corn starch to less than 10%;

[0020] 6) Grinding: Grinding the dried high-amylose corn starch with an ultrafine pulverizer; crushing the high-amylose corn starch into micron-sized particles to improve its solubility and taste;

[0021] 7) Packaging: Use automatic packaging equipment or manual packaging to pack the ground high-amylose corn starch into packages; control the weight and error of each bag to ensure that the net content of the product meets the standard; seal the packaged products to ensure that the seals are firm and smooth without air leakage.

[0022] Preferably, in step 1), a vibrating screen is used to classify the corn according to size through 5 mm, 4 mm and 3 mm sieves, and to remove impurities and broken particles therefrom; a destoner is used to remove stones from the corn by utilizing the difference in specific gravity; and a magnetic separator is used to remove magnetic impurities from the corn.

[0023] Preferably, in step 4), the pulverizing process is to place the treated corn kernels into a pulverizing device for pulverization; multiple pulverizations are performed to gradually increase the fineness of the high-amylose corn starch; after each pulverization, the high-amylose corn starch is screened and particles that do not meet the particle size requirements are pulverized again.

[0024] Preferably, the drying equipment in step 5) is a hot air dryer or a microwave dryer.

[0025] Preferably, in step 5), during the drying process, the high-amylose corn starch is regularly stirred and turned over to ensure uniform drying; the high-amylose corn starch after drying is cooled to room temperature before subsequent treatment.

[0026] Preferably, flour / soy powder / milk powder / honey is added to the high-amylose corn starch ground in step 6) to improve the taste and flavor; the high-amylose corn starch and flour / soy powder / milk powder / honey are put into a mixer for mixing; the mixer is a horizontal mixer, a vertical mixer or a double-helix cone mixer.

[0027] Preferably, the subpackaging in step 7) is carried out by nitrogen-filled packaging.

[0028] On the other hand, the present application provides the following solution:

[0029] A method for planting corn used in the above-mentioned production method comprises the following steps:

[0030] 1) Corn seed selection: Select corn seeds with a purity of no less than 98%, a germination rate of more than 90%, and a moisture content of 12-14%;

[0031] 2) Select a planting base: Choose a deep, fertile, loose, well-drained soil with an organic matter content of more than 2%, a total nitrogen content of more than 0.1%, an effective phosphorus content of more than 15mg / kg, an available potassium content of more than 100mg / kg, and a pH value of 6.0-7.5 in a neutral or slightly acidic soil; an area with an annual average temperature of more than 10℃, a frost-free period of more than 120 days, sunshine hours of more than 2,000 hours, uniform precipitation, and simultaneous rain and heat;

[0032] 3) Corn field management: sow in spring or summer when the soil temperature is stable above 10℃; before sowing, apply basal fertilizer in combination with deep tillage; the application rate of basal fertilizer is 2000-3000 kg per mu; the application rate of nitrogen, phosphorus and potassium compound fertilizer is 30-50 kg per mu; during the growth period of corn, apply topdressing according to the growth and development stage; in the jointing stage and the large trumpet stage, apply 15-20 kg of nitrogen fertilizer and 10-15 kg of potassium fertilizer per mu to promote stem and leaf growth and ear differentiation; in the filling stage, spray foliar fertilizer on the leaves to increase grain weight and quality; in the seedling stage, keep the soil moderately dry; in the jointing stage, heading stage and filling stage, water to keep the soil moist, pay attention to avoid waterlogging, prevent root hypoxia and disease;

[0033] 4) Corn harvesting and storage: When the milk line of the corn kernels disappears, the black layer appears, and the moisture content drops below 20%, use mechanized harvesting or manual harvesting for harvesting; dry the harvested corn in time to reduce the moisture content to below 14% to prevent mildew and germination; store the dried corn in a dry, ventilated, and cool warehouse to avoid mixing with toxic, harmful, and odorous substances; check the storage condition of the corn regularly and deal with any problems in a timely manner.

[0034] Preferably, in step 3), a combination of physical control, biological control and chemical control is used to control pests and diseases; physical control uses light trapping and color plate trapping; biological control uses natural enemy insects and beneficial microorganisms for control; and chemical control selects pesticides for spraying operations.

[0035] More preferably, the step 3) is performed by row sowing; the sowing depth is 3-5 cm, and the planting density per mu is between 3000-5000 plants.

[0036] The present invention has the following advantages:

[0037] Provided are a method for preparing high-amylose corn starch and a method for planting corn used therein. The prepared high-amylose corn starch contains a large amount of dietary fiber and more than 40% of natural resistant starch, which is helpful for treating fatty liver, lowering blood lipids and blood sugar, effectively reducing weight, and maintaining a stable and non-rebounding effect. It can also regulate intestinal flora, has the effects of reducing weight and regulating blood sugar, promoting cardiovascular and cerebrovascular health, reducing the risk of diabetes, lowering blood lipids and cholesterol, promoting intestinal health, enhancing body resistance, etc., and has a good promotion prospect and economic value.

[0038] The advantages of the production method are as follows:

[0039] Strict color sorting and cleaning ensures the purity of raw materials. Optical color sorters are combined with vibrating screens, stone removers and magnetic separators for multi-step cleaning. The optical color sorter accurately screens out impurities such as discolored kernels, moldy kernels and damaged kernels by identifying and analyzing the color, shape and size characteristics of corn, ensuring the consistency of the appearance quality of corn entering the subsequent process. The vibrating screen uses screens of different sizes to grade and remove impurities and broken kernels. The stone remover removes stones based on the difference in specific gravity. The magnetic separator removes magnetic impurities. These steps are progressive, removing all kinds of impurities that may affect the quality of starch to the greatest extent, providing a pure raw material basis for the production of high-quality high-amylose corn starch.

[0040] Comprehensive and meticulous cleaning improves safety. Use a cleaning machine for multiple cleaning methods such as spraying, soaking and stirring. The water temperature is controlled between 10-20℃, and the cleaning is performed 2-3 times, each time for 5-10 minutes. This cleaning method can fully remove dirt and pesticide residues on the surface of corn. Spraying allows the water flow to fully cover the surface of the corn, soaking allows the cleaning liquid to fully contact the corn, and stirring enhances the cleaning strength. Reasonable control of the water temperature within an appropriate range not only ensures the cleaning effect, but also does not adversely affect the quality of the corn. After multiple cleanings, the cleanliness of the corn is ensured, the safety of the final product is improved, and it meets the consumer's demand for healthy food.

[0041] Dehulling and removing germs improves starch purity. First, use a dehulling machine to dehull the corn, control the dehulling rate between 80% and 90%, then use a germ separator or manually select the germs, and wash the remaining impurities again. The dehulling process removes the outer skin of the corn, reducing the impact of impurities and pigments in the outer skin on the starch. Dehulling by friction and extrusion can accurately control the degree of dehulling according to product requirements, ensuring production flexibility. The degerming process further removes the germ part that may affect the quality of starch, and the second washing ensures the thorough removal of residual germs and impurities. This series of operations significantly improves the purity of high-amylose corn starch and provides high-quality intermediate products for subsequent processing.

[0042] Precise crushing and grinding optimize product performance. Roller mills are used in the crushing process. Screens of different specifications are selected according to the particle size requirements to make the particle size of high-amylose corn starch between 80-120 meshes, and multiple crushing and screening methods are used. Accurate control of starch particle size helps to improve its solubility and stability in subsequent applications. Multiple crushing and screening ensure the uniformity of starch particles. Particles that do not meet the particle size requirements are re-crushed to ensure the consistency of product quality. Screens of different specifications meet the specific requirements of different products for particle size, increasing the flexibility and adaptability of production. Superfine mills are used in the grinding process to crush starch into micron-sized particles to improve solubility and taste. Superfine grinding makes the particles of high-amylose corn starch smaller, greatly improving its solubility, making it more widely used in food, industry and other fields. At the same time, the fine particles also improve the taste, bringing consumers a better eating experience.

[0043] Scientific drying ensures stable quality. Use drying equipment to dry starch, ensure the sealing and safety of the equipment, control the starch thickness at 2-3 cm, reduce the moisture content to below 10%, stir and turn it regularly, and cool it to room temperature after drying. Good equipment sealing prevents heat loss, improves energy efficiency, and also prevents external impurities from entering the starch. Safety guarantees reduce the risk of accidents such as fire. Evenly spread the starch and control the thickness, as well as regularly stir and turn it over to ensure the uniformity of drying and prevent local overheating or insufficient drying. Reduce the moisture content to below 10%, ensure the stability of the starch during storage and transportation, and extend the shelf life of the product. Cool to room temperature for subsequent processing to avoid quality changes that may be caused by excessive temperature.

[0044] Standardized packaging ensures product quality. Automated packaging equipment or manual packaging can be used to control the weight and error of each bag to ensure that the net content meets the standard. Nitrogen-filled packaging is used and the seal is firm, flat, and leak-free. Automated packaging equipment improves production efficiency and packaging accuracy, while manual packaging has certain advantages in flexibility. Strictly controlling the weight and error of each bag ensures product standardization and meets market regulatory requirements. Nitrogen-filled packaging can effectively prevent starch oxidation and deterioration, maintaining its freshness and quality. Firm, flat, and leak-free seals ensure the sealing of the package, further ensuring the quality of the product during storage and transportation.

[0045] The advantages of the planting method are as follows:

[0046] Strict seed selection ensures seed quality. Corn seeds with a purity of no less than 98%, a germination rate of more than 90%, and a water content of 12-14% are selected. High-purity seeds ensure the consistency and stability of corn planting and reduce growth differences caused by impure seeds. High germination rate ensures the emergence rate after sowing, reducing the cost and time waste of replanting. Appropriate water content ensures the vitality of seeds during storage and sowing, laying the foundation for the good growth of corn.

[0047] Scientifically select the planting base, provide a suitable growth environment, and a deep soil layer is conducive to the growth and extension of the corn root system, which can better absorb water and nutrients in the soil. Fertile soil provides rich nutrients to meet the needs of corn growth and development. Loose soil structure helps the circulation of air and water and promotes the respiration of the root system. Good drainage performance prevents water accumulation, avoids root hypoxia and disease. Suitable soil pH and nutrient content provide an ideal chemical environment for the growth of corn. Climate conditions: annual average temperature above 10℃, frost-free period above 120 days, sunshine hours above 2000 hours, uniform precipitation, and rain and heat at the same time. The higher annual average temperature and longer frost-free period provide sufficient heat conditions for the growth of corn, ensuring that corn can successfully complete the growth cycle. Adequate sunshine hours are conducive to corn photosynthesis, synthesizing more organic matter, and improving yield and quality. Uniform precipitation and rain and heat at the same time enable corn to obtain sufficient water during its growth and grow and develop at a suitable temperature.

[0048] Reasonable field management promotes corn growth and development, and timely sowing: sowing in spring or summer, when the soil temperature is stable above 10°C. Choose the right sowing season and soil temperature to ensure that corn seeds can germinate and grow in a suitable environment. Avoid the problem of slow germination or no seedlings caused by sowing under low temperature conditions.

[0049] Scientific fertilization specifically meets the nutritional needs of corn at different growth stages, promotes stem and leaf growth, ear differentiation and grain weight increase, and improves corn yield and quality. Reasonable irrigation: Keep the soil moderately dry during the seedling stage; water during the jointing, heading and filling stages to keep the soil moist and avoid water accumulation. Moderate drought during the seedling stage is conducive to the root system's growth and growth, and enhances the stress resistance of corn. Watering during the critical growth period ensures the corn's demand for water and promotes growth and development. Avoiding water accumulation prevents root hypoxia and disease, and ensures the healthy growth of corn.

[0050] Standardize harvesting and storage to ensure corn quality and harvest in time: When the milk line of corn kernels disappears, the black layer appears, and the moisture content drops below 20%, mechanized harvesting or manual harvesting is used for harvesting. Choose the right time to harvest to ensure that the corn is fully mature, which improves the yield and quality of corn. Timely drying: The harvested corn is dried in time to reduce the moisture content to below 14% to prevent mildew and germination. Reduce the moisture content of corn to prevent mildew and germination, and ensure the storage stability of corn. Proper storage: Store the dried corn in a dry, ventilated, and cool warehouse to avoid mixing with toxic, harmful, and odorous substances. Check the storage of corn regularly and deal with problems in time. Good storage conditions extend the storage period of corn and avoid quality degradation and loss caused by improper storage. Regular inspections ensure that problems are discovered and handled in time to ensure the quality of corn. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a process flow chart of the present invention.

[0052] Figure 2 It is a bar chart comparing the dietary fiber and natural resistant starch components of the high amylose corn starch prepared by the present invention and the existing corn starch. DETAILED DESCRIPTION

[0053] The present application is further described in detail below in conjunction with embodiments, but the protection scope of the present application is not limited to the following embodiments.

[0054] Example 1

[0055] A method for preparing high-amylose corn starch comprises the following steps:

[0056] 1) Color sorting and cleaning: Optical color sorters are used to sort corn, accurately identify the color, shape and size characteristics of corn, and screen out impurities such as different-colored kernels, moldy kernels and damaged kernels. Vibrating screens are used to grade the color-sorted corn through 5mm, 4mm and 3mm screens to remove impurities and broken kernels. Stone removers use the difference in specific gravity to remove stones, and magnetic separators remove magnetic impurities.

[0057] 2) Cleaning: Use a cleaning machine to spray, soak and stir the corn, and control the water temperature at 20°C. Clean 3 times, each time for 8 minutes, to effectively remove dirt and pesticide residues on the surface of the corn.

[0058] 3) Peeling and Germ Removal: The corn is peeled by a peeling machine, and the peeling rate is controlled at 90%. The peeled corn is then removed by a germ separator, and then washed again to remove the remaining germ and impurities.

[0059] 4) Crushing: The processed corn kernels are placed in a crushing device for multiple crushing to gradually increase the fineness of the high-amylose corn starch.

[0060] After each crushing, screening is performed and particles that do not meet the particle size requirements are crushed again to make the particle size of high amylose corn starch reach 100 mesh.

[0061] 5) Drying: Use a hot air dryer to dry the high amylose corn starch. Ensure the tightness and safety of the equipment to prevent heat loss and fire accidents. Spread the starch evenly on the tray with a thickness of 2.5 cm. Stir and turn it regularly during the drying process to ensure uniform drying. After the dried high amylose corn starch is cooled to room temperature, it is subsequently treated to reduce its moisture content to 9%.

[0062] 6) Grinding: Use an ultra-fine grinder to grind the dried high-amylose corn starch into micron-sized particles to improve solubility and taste. Add flour to the ground high-amylose corn starch and mix in a horizontal mixer to improve taste and flavor.

[0063] 7) Packaging: Use automated packaging equipment to pack the ground high-amylose corn starch into packages, control the weight and error of each bag, and ensure that the net content of the product meets the standard. Use nitrogen-filled packaging, with a firm and smooth seal without air leakage.

[0064] Technical effect analysis:

[0065] The color sorting, cleaning and washing steps ensure the purity of the corn raw materials, providing a high-quality foundation for subsequent production. Dehulling and removing the germ improves the purity of the starch, and multiple crushing and ultra-fine grinding make the starch particle size finer and more soluble. After adding flour to the mixture, the taste is richer and more suitable for the taste needs of more consumers. The use of hot air dryers ensures the drying effect of starch, and nitrogen-filled packaging extends the shelf life of the product.

[0066] The above corn planting method comprises the following steps:

[0067] 1) Corn seed selection: Select corn seeds with a purity of no less than 98%, a germination rate of more than 90%, and a moisture content of 13% to ensure the excellent quality of the seeds.

[0068] 2) Selecting a planting base: Choose a deep, fertile, loose, well-drained soil with an organic matter content of more than 2%, a total nitrogen content of more than 0.1%, an effective phosphorus content of more than 15mg / kg, an available potassium content of more than 100mg / kg, and a pH value of 6.5. At the same time, select an area with an annual average temperature of more than 10℃, a frost-free period of more than 120 days, sunshine hours of more than 2,000 hours, uniform precipitation, and simultaneous rain and heat, to provide good natural conditions for the growth of corn.

[0069] 3) Corn field management: Sowing in spring, when the soil temperature is stable above 10°C. Before sowing, apply basal fertilizer in combination with deep tillage of the soil, with an application rate of 2,500 kg per mu, and 40 kg per mu of nitrogen, phosphorus and potassium compound fertilizer. During the growth period of corn, topdressing is carried out according to the growth and development stage. In the jointing stage and the large trumpet stage, 18 kg of nitrogen fertilizer and 12 kg of potassium fertilizer are applied per mu to promote stem and leaf growth and ear differentiation. In the filling stage, foliar fertilizer is sprayed on the leaves to increase grain weight and quality.

[0070] Keep the soil moderately dry during the seedling stage, water during the jointing, heading and filling stages to keep the soil moist and avoid waterlogging to prevent root hypoxia and disease. Use a combination of physical, biological and chemical control methods to control pests and diseases. Sow in rows with a sowing depth of 4 cm and a planting density of 4,000 per mu.

[0071] 4) Corn harvesting and storage: Mechanized harvesting is used when the milk line of corn kernels disappears, the black layer appears, and the moisture content drops below 20%. Dry the corn promptly after harvesting to reduce the moisture content to below 14% to prevent mildew and germination. Store the dried corn in a dry, ventilated, and cool warehouse to avoid mixing with toxic, harmful, and odorous substances, and check the storage conditions regularly.

[0072] Technical effect analysis:

[0073] Strict seed selection standards ensure the quality and germination rate of corn, providing high-quality raw materials for the production of high-amylose corn starch. Reasonable selection of planting bases and scientific field management measures, including fertilization, watering, pest and disease control, promote the growth and development of corn, and improve the yield and quality of corn. Scientific harvesting and storage methods ensure the quality and storage period of corn.

[0074] Example 2

[0075] A method for preparing high-amylose corn starch comprises the following steps:

[0076] 1) Color sorting and cleaning: Use an optical color sorter to sort the corn to filter out impurities such as different-colored kernels, moldy kernels, and damaged kernels. Vibrating screens, stone removers, and magnetic separators are used to clean the color-sorted corn in turn to remove impurities and dust.

[0077] 2) Cleaning: The cleaning machine uses spraying, soaking and stirring to clean the corn, and the water temperature is controlled at 10°C. Clean twice, each time for 5 minutes.

[0078] 3) Peeling and Germ Removal: The peeling machine peels the corn, and the peeling rate is 80%. The peeled corn is manually selected to remove the germ, and then washed again to remove the remaining germ and impurities.

[0079] 4) Crushing: A roller mill is used to crush the peeled and germ-free corn kernels. Through multiple crushing and screening, the particle size of the high-amylose corn starch reaches 110 meshes.

[0080] 5) Drying: Use a microwave dryer to dry the high amylose corn starch. Ensure the tightness and safety of the equipment to prevent heat loss and fire accidents. Spread the starch evenly on the conveyor belt with a thickness of 2.2 cm. Stir and turn it regularly during the drying process to reduce the moisture content of the high amylose corn starch to 8%.

[0081] 6) Grinding: Use an ultra-fine grinder to grind the dried high-amylose corn starch into micron-sized particles to improve solubility and taste. Add soybean powder to the ground high-amylose corn starch and mix in a vertical mixer to improve taste and flavor.

[0082] 7) Packaging: Use manual packaging to pack the ground high-amylose corn starch into the package, control the weight and error of each bag, and ensure that the net content of the product meets the standard. Use nitrogen-filled packaging, with a firm and smooth seal without air leakage.

[0083] Technical effect analysis:

[0084] Color sorting, cleaning and washing steps ensure the purity of corn raw materials. Dehulling, removing germs and multiple crushing improve the purity and fineness of starch. The use of microwave dryers makes drying more efficient, and adding soybean powder to the mixture increases the nutritional value and unique taste of the product. Manual packaging and nitrogen-filled packaging ensure the quality and freshness of the product.

[0085] The above corn planting method comprises the following steps:

[0086] 1) Corn seed selection: Select corn seeds with a purity of not less than 98%, a germination rate of more than 91%, and a moisture content of 12.5%.

[0087] 2) Select a planting base: Choose fertile, loose, well-drained soil with an organic matter content of more than 2.1%, a total nitrogen content of more than 0.11%, an effective phosphorus content of more than 16 mg / kg, an available potassium content of more than 105 mg / kg, and a slightly acidic soil with a pH value of 7.0. At the same time, choose an area with an annual average temperature of more than 11°C, a frost-free period of more than 125 days, sunshine hours of more than 2,100 hours, uniform precipitation, and simultaneous rain and heat.

[0088] 3) Corn field management: sowing in summer, when the soil temperature is stable above 11°C. Before sowing, apply basal fertilizer in combination with deep tillage of the soil, with an application rate of 2,600 kg per mu, and 50 kg per mu of nitrogen, phosphorus and potassium compound fertilizer. During the growth period of corn, topdressing is carried out according to the growth and development stage. In the jointing stage and the large trumpet stage, 15 kg of nitrogen fertilizer and 11 kg of potassium fertilizer are applied per mu to promote stem and leaf growth and ear differentiation. In the filling stage, foliar fertilizer is sprayed on the leaves to increase grain weight and quality. Keep the soil moderately dry in the seedling stage, water in the jointing stage, heading stage and filling stage, keep the soil moist, avoid waterlogging, and prevent root hypoxia and disease. Use a combination of physical control, biological control and chemical control to control pests and diseases. Sowing is done in rows, with a sowing depth of 4 cm and a planting density of 3,000 plants per mu.

[0089] 4) Corn harvesting and storage: When the milk line of corn kernels disappears, the black layer appears, and the moisture content drops below 20%, corn kernels are harvested manually. After harvesting, they are dried in time to reduce the moisture content to 13.5% to prevent mildew and germination. The dried corn is stored in a dry, ventilated, and cool warehouse to avoid mixing with toxic, harmful, and odorous substances, and the storage conditions are checked regularly.

[0090] Technical effect analysis:

[0091] High-quality seed selection provides a good foundation for the production of high-amylose corn starch. Suitable planting bases and scientific field management measures promote the growth and development of corn, and improve the yield and quality of corn. Reasonable harvesting and storage methods ensure the quality and storage period of corn.

[0092] Example 3

[0093] A method for preparing high-amylose corn starch comprises the following steps:

[0094] 1) Color sorting and cleaning: Optical color sorters are used to sort corn to remove impurities such as different-colored kernels, moldy kernels, and damaged kernels. Vibrating screens, stone removers, and magnetic separators are used to clean the corn after color sorting to remove impurities and dust.

[0095] 2) Cleaning: Use a cleaning machine to clean the corn, and control the water temperature at 18°C. Clean 3 times, each time for 10 minutes.

[0096] 3) Peeling and Germ Removal: The peeling machine peels the corn, and the peeling rate is 88%. The peeled corn is removed by the germ separator, and then cleaned again to remove the remaining germ and impurities.

[0097] 4) Crushing: A roller mill is used to crush the peeled and germ-free corn kernels. Through multiple crushing and screening, the particle size of the high-amylose corn starch reaches 80 mesh.

[0098] 5) Drying: Use a hot air dryer to dry the high amylose corn starch. Ensure the tightness and safety of the equipment to prevent heat loss and fire accidents. Spread the starch evenly on the tray with a thickness of 2.3 cm. Stir and turn it regularly during the drying process to reduce the moisture content of the high amylose corn starch to 9%.

[0099] 6) Grinding: Use an ultra-fine grinder to grind the dried high-amylose corn starch into micron-sized particles to improve solubility and taste. Add milk powder to the ground high-amylose corn starch and mix in a double-screw conical mixer to improve taste and flavor.

[0100] 7) Packaging: Use automated packaging equipment to pack the ground high-amylose corn starch into packages, control the weight and error of each bag, and ensure that the net content of the product meets the standard. Use nitrogen-filled packaging, with a firm and smooth seal without air leakage.

[0101] Technical effect analysis:

[0102] The color sorting, cleaning and washing steps ensure the quality of the corn raw materials. The peeling, germ removal and multiple crushing improve the purity and fineness of the starch. The use of hot air dryers ensures the drying effect of the starch. After adding milk powder, the product has a strong milky flavor and a richer taste. Automated packaging and nitrogen-filled packaging improve production efficiency and the shelf life of the product.

[0103] The above corn planting method comprises the following steps:

[0104] 1) Corn seed selection: Select corn seeds with a purity of no less than 98%, a germination rate of more than 92%, and a moisture content of 13.5%.

[0105] 2) Select a planting base: Choose a deep, fertile, loose, well-drained soil with an organic matter content of more than 2.3%, a total nitrogen content of more than 0.12%, an effective phosphorus content of more than 17mg / kg, an available potassium content of more than 110mg / kg, and a pH value of 6.8. At the same time, choose an area with an annual average temperature of more than 12°C, a frost-free period of more than 130 days, sunshine hours of more than 2,200 hours, uniform precipitation, and simultaneous rain and heat.

[0106] 3) Corn field management: sowing in spring, when the soil temperature is stable above 12°C. Before sowing, apply basal fertilizer in combination with deep tillage of the soil, with an application rate of 2,000 kg per mu, and 30 kg per mu of nitrogen, phosphorus and potassium compound fertilizers. During the growth period of corn, topdressing is carried out according to the growth and development stage. In the jointing stage and the large trumpet stage, 19 kg of nitrogen fertilizer and 10 kg of potassium fertilizer are applied per mu to promote stem and leaf growth and ear differentiation. In the filling stage, foliar fertilizer is sprayed on the leaves to increase grain weight and quality. Keep the soil moderately dry in the seedling stage, water in the jointing stage, heading stage and filling stage, keep the soil moist, avoid waterlogging, and prevent root hypoxia and disease. Use a combination of physical control, biological control and chemical control to control pests and diseases. Sowing is done in rows, with a sowing depth of 4.5 cm and a planting density of 4,500 plants per mu.

[0107] 4) Corn harvesting and storage: Mechanized harvesting is used when the milk line of corn kernels disappears, the black layer appears, and the moisture content drops below 20%. Dry the corn promptly after harvesting to reduce the moisture content to below 14% to prevent mildew and germination. Store the dried corn in a dry, ventilated, and cool warehouse to avoid mixing with toxic, harmful, and odorous substances, and check the storage conditions regularly.

[0108] Technical effect analysis:

[0109] Strict seed selection standards ensure the quality and germination rate of corn. Reasonable planting base selection and field management measures promote the growth and development of corn, and improve the yield and quality of corn. Scientific harvesting and storage methods ensure the quality and storage period of corn, providing high-quality raw materials for the production of high-amylose corn starch.

[0110] Example 4

[0111] A method for preparing high-amylose corn starch comprises the following steps:

[0112] 1) Color sorting and cleaning: Use an optical color sorter to sort the corn to filter out impurities such as different-colored kernels, moldy kernels, and damaged kernels. Vibrating screens, stone removers, and magnetic separators are used to clean the corn after color sorting to remove impurities and dust.

[0113] 2) Cleaning: The corn is cleaned in a cleaning machine with the water temperature controlled at 14° C. The corn is cleaned 3 times, each time for 6 minutes.

[0114] 3) Dehulling and Germ Removal: The dehulling machine dehulls the corn, and the dehulling rate is 84%. The dehulled corn is degermed by manual selection, and then washed again to remove the remaining germ and impurities.

[0115] 4) Crushing: A roller mill is used to crush the peeled and germ-free corn kernels. Through multiple crushing and screening, the particle size of the high-amylose corn starch reaches 120 mesh.

[0116] 5) Drying: Use a microwave dryer to dry the high amylose corn starch. Ensure the sealing and safety of the equipment to prevent heat loss and fire accidents. Spread the starch evenly on the conveyor belt with a thickness of 2 cm. Stir and turn it regularly during the drying process to reduce the moisture content of the high amylose corn starch to 8%.

[0117] 6) Grinding: Use an ultra-fine grinder to grind the dried high-amylose corn starch into micron-sized particles to improve solubility and taste. Add honey to the ground high-amylose corn starch and mix it in a horizontal mixer to improve taste and flavor.

[0118] 7) Packaging: Use manual packaging to pack the ground high-amylose corn starch into the package, control the weight and error of each bag, and ensure that the net content of the product meets the standard. Use nitrogen-filled packaging, with a firm and smooth seal without air leakage.

[0119] Technical effect analysis:

[0120] Color sorting, cleaning and washing steps ensure the purity of corn raw materials. Dehulling, germ removal and multiple crushing improve the purity and fineness of starch. Microwave drying is efficient, and after adding honey, the product has a unique sweetness and taste. Manual packaging and nitrogen-filled packaging ensure the quality and freshness of the product.

[0121] The above corn planting method comprises the following steps:

[0122] 1) Corn seed selection: Select corn seeds with a purity of no less than 98%, a germination rate of more than 92%, and a moisture content of 13.5%.

[0123] 2) Select a planting base: Choose fertile, loose, well-drained soil with an organic matter content of more than 2.2%, a total nitrogen content of more than 0.11%, an effective phosphorus content of more than 16 mg / kg, an available potassium content of more than 105 mg / kg, and a slightly acidic pH value of 7.2. At the same time, choose an area with an annual average temperature of more than 11°C, a frost-free period of more than 125 days, sunshine hours of more than 2,100 hours, uniform precipitation, and simultaneous rain and heat.

[0124] 3) Corn field management: sowing in spring, when the soil temperature is stable above 12°C. Before sowing, apply basal fertilizer in combination with deep tillage of the soil, with an application rate of 3,000 kg per mu, and 45 kg per mu of nitrogen, phosphorus and potassium compound fertilizers. During the growth period of corn, topdressing is carried out according to the growth and development stage. In the jointing stage and the large trumpet stage, 20 kg of nitrogen fertilizer and 15 kg of potassium fertilizer are applied per mu to promote stem and leaf growth and ear differentiation. In the filling stage, foliar fertilizer is sprayed on the leaves to increase grain weight and quality. Keep the soil moderately dry in the seedling stage, water in the jointing stage, heading stage and filling stage, keep the soil moist, avoid waterlogging, and prevent root hypoxia and disease. Use a combination of physical control, biological control and chemical control to control pests and diseases. Sowing is done in rows, with a sowing depth of 4.5 cm and a planting density of 5,000 plants per mu.

[0125] 4) Corn harvesting and storage: Mechanized harvesting is used when the milk line of corn kernels disappears, the black layer appears, and the moisture content drops below 20%. Dry the corn promptly after harvesting to reduce the moisture content to below 14% to prevent mildew and germination. Store the dried corn in a dry, ventilated, and cool warehouse to avoid mixing with toxic, harmful, and odorous substances, and check the storage conditions regularly.

[0126] Technical effect analysis:

[0127] Strict seed selection standards ensure the quality and germination rate of corn. Reasonable planting base selection and field management measures promote the growth and development of corn, and improve the yield and quality of corn. Scientific harvesting and storage methods ensure the quality and storage period of corn, providing high-quality raw materials for the production of high-amylose corn starch.

[0128] The dietary fiber and natural resistant starch components of the high amylose corn starch prepared by the present invention and the dietary fiber and natural resistant starch components of the existing corn starch are analyzed as follows. Three groups are taken from each group to measure the dietary fiber content % and the natural resistant starch content %

[0129] Dietary fiber content% Natural resistant starch content% High amylose corn starch 1 10.5 70.4 High amylose corn starch 2 15.2 67.7 High amylose corn starch 3 12.1 66.3 Corn starch 1 8.2 50.1 Corn starch 2 9.5 48.0 Corn starch 3 8.8 44.5

[0130] It can be clearly seen that the dietary fiber and natural resistant starch components of the high-amylose corn starch prepared by the present invention are much higher than those of existing corn starch.

[0131] The research data related to dietary fiber and intestinal health are as follows:

[0132] Several studies have shown that dietary fiber can increase stool bulk and shorten intestinal transit time. For example, a study of 100 healthy volunteers found that consuming 100 grams of high-amylose corn starch (which contained 10-15 grams of dietary fiber) per day increased stool weight by an average of 20 grams and shortened intestinal transit time by 1.5 hours after one week.

[0133] The research data related to natural resistant starch and blood sugar regulation are as follows:

[0134] Studies have found that resistant starch can delay the digestion and absorption of carbohydrates, thereby reducing the blood sugar response after a meal. In a clinical trial of diabetic patients, patients added 100g of high-amylose corn starch (resistant starch content of 60-70g) to their diet, and their blood sugar levels 2 hours after a meal were reduced by an average of 0.9-2.2mmol / L compared to the group without added starch.

[0135] Another long-term study followed 56 people with prediabetes and gradually increased their intake of high-amylose corn starch in their daily diet. After six months of observation, it was found that the rate of developing type 2 diabetes was reduced by 55%.

[0136] The research data related to the high-amylose corn starch prepared by the present invention and weight management are as follows:

[0137] In a 100-day weight loss study, 200 obese people replaced part of the traditional carbohydrates in their diet with high-amylose corn starch. The results showed that the average weight dropped by 8.5 kg, the average body fat rate decreased by 4.5%, and in subsequent follow-up observations, the proportion of weight rebound was significantly lower than that of traditional weight loss methods.

[0138] The research data related to the high-amylose corn starch prepared by the present invention and cardiovascular health are as follows:

[0139] High-amylose corn starch can lower blood cholesterol levels. In a study of patients with hyperlipidemia, patients who consumed a diet rich in high-amylose corn starch for two months had an average reduction in total cholesterol levels of 1.1 mmol / L and low-density lipoprotein cholesterol (LDL-C) levels of 0.5 mmol / L.

[0140] At the same time, high-amylose corn starch can also improve endothelial function and reduce inflammatory response. By testing endothelial markers, it was found that after consuming high-amylose corn starch, endothelial-dependent vasodilation function was significantly improved, and the level of inflammatory factors such as C-reactive protein was reduced by 52.5%.

[0141] Cases of patients with fatty liver treated with high-amylose corn starch prepared by the present invention

[0142] Patient basic information: male, 45 years old, with moderate fatty liver, body mass index (BMI) of 28.5kg / m 2 , accompanied by elevated triglycerides and impaired fasting glucose.

[0143] Treatment plan: Under the guidance of a doctor, adjust your diet and increase your intake of high-amylose corn starch. Eat foods made from high-amylose corn starch, such as corn tortillas, for breakfast every day, and eat a moderate amount of high-amylose corn starch for lunch and dinner. At the same time, exercise appropriately, and do at least 150 minutes of moderate-intensity aerobic exercise per week.

[0144] Treatment effect: After 6 months of treatment, the patient's liver ultrasound showed that the degree of fatty liver was significantly reduced, triglyceride levels dropped to the normal range, and fasting blood sugar returned to normal. The weight dropped by 8 kg and the BMI dropped to 25 kg / m 2 .

[0145] Cases of diabetes patients treated with the high-amylose corn starch prepared by the present invention:

[0146] ·Basic information of the patient: Female, 58 years old, with a history of type 2 diabetes for 5 years. She has been using oral hypoglycemic drugs to control blood sugar, but her blood sugar fluctuates greatly.

[0147] Treatment plan: Based on the original treatment plan, adjust the diet and increase the intake of high-amylose corn starch. Replace part of the refined grains with high-amylose corn starch every day, such as replacing part of the white rice with rice cooked with high-amylose corn starch.

[0148] Treatment effect: After 3 months of adjustment, the patient's blood sugar control was more stable, and glycosylated hemoglobin dropped from 7.8% to 7.0%. At the same time, the patient's satiety increased, food intake decreased, and weight also decreased slightly.

[0149] The high-amylose corn starch prepared by the present invention regulates the intestinal flora as follows:

[0150] Intestinal flora types Changes Bifidobacterium Increased by 45.6% Lactobacilli Increased by 32.3% Escherichia coli 63.4% reduction

[0151] Microbial analysis of fecal samples of experimental subjects revealed that after consuming high-amylose corn starch, the number of beneficial bacteria in the intestines, such as bifidobacteria and lactobacilli, increased significantly, while the number of harmful bacteria, Escherichia coli, decreased. This suggests that high-amylose corn starch can regulate the balance of intestinal flora and promote intestinal health.

[0152] The high-amylose corn starch prepared by the present invention has significant technical effect and progress, which is specifically manifested as follows:

[0153] In terms of ingredients, the high-amylose corn starch contains 10-15% dietary fiber and 60-70% natural resistant starch. Dietary fiber can increase stool volume and shorten intestinal transit time. For example, in a study of 100 healthy volunteers, after daily intake of high-amylose corn starch containing a certain amount of dietary fiber, stool weight increased by an average of 20 grams and intestinal transit time was shortened by 1.5 hours. Natural resistant starch can delay carbohydrate digestion and absorption and reduce postprandial blood sugar response. In clinical trials of diabetic patients, the addition of high-amylose corn starch reduced blood sugar levels by an average of 0.9-2.2mmol / L 2 hours after a meal; long-term studies have shown that the proportion of prediabetic patients who develop type 2 diabetes is reduced by 55% after increasing their intake of high-amylose corn starch.

[0154] In terms of weight management, in a 100-day weight loss study, 200 obese people replaced part of the traditional carbohydrates with high-amylose corn starch. Their average weight loss was 8.5 kg, their body fat percentage decreased by 4.5%, and the subsequent weight rebound rate was significantly lower than that of traditional weight loss methods.

[0155] For cardiovascular health, high-amylose corn starch can lower blood cholesterol levels. In a study of patients with hyperlipidemia, total cholesterol levels were reduced by an average of 1.1 mmol / L, and low-density lipoprotein cholesterol levels were reduced by 0.5 mmol / L. It can also improve endothelial function and reduce inflammatory responses, such as significant improvement in endothelium-dependent relaxation function and a 52.5% reduction in the level of inflammatory factor C-reactive protein.

[0156] It also has outstanding effects in the treatment of fatty liver and diabetes. For a 45-year-old male patient with moderate fatty liver, the diet was adjusted to increase the intake of high-amylose corn starch and exercise. After 6 months, the degree of fatty liver was significantly reduced, triglycerides and fasting blood sugar returned to normal, the weight dropped by 8 kg, and the BMI dropped to the normal range. For a 58-year-old female patient with type 2 diabetes, after increasing the intake of high-amylose corn starch, blood sugar control was more stable, glycosylated hemoglobin was reduced, satiety was enhanced, and food intake and weight decreased slightly.

[0157] In addition, high-amylose corn starch can regulate the balance of intestinal flora. After consumption, the number of bifidobacteria in the intestine increases by 45.6%, the number of lactobacilli increases by 32.3%, and the number of Escherichia coli decreases by 63.4%, thus promoting intestinal health.

[0158] In summary, the high-amylose corn starch prepared by the present invention shows excellent technical effect progress in many aspects and has good promotion prospects and economic value.

[0159] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for preparing high-amylose corn starch, characterized in that: The following steps are involved: 1) Color sorting and cleaning: Use optical color sorter to sort corn; by identifying and analyzing the color, shape and size characteristics of corn, The impurities of different-colored kernels, moldy kernels and damaged kernels are screened out; the corn after color sorting is cleaned by vibrating screen, stone remover and magnetic separator to remove Impurities and dust; 2) Cleaning: Use a cleaning machine to clean the corn by spraying, soaking and stirring to remove dirt and pesticide residues on the surface of the corn; Put the corn into the cleaning machine, add clean water, and control the water temperature between 10-20℃; wash 2-3 times, each washing time is 5-10 minutes; 3) Peeling and removing germs: The corn is peeled by a peeling machine; the peeling machine removes the outer skin of the corn by friction and extrusion; the degree of peeling is controlled according to product requirements, and the peeling rate is between 80% and 90%; the peeled corn is degermed by a germ separator or manual selection; the corn kernels after degerming are washed again to remove the remaining germ and impurities; 4) Crushing: Use a roller mill to crush the peeled and germ-free corn kernels into fine powder; select screens of different specifications according to the particle size requirements of the product; the particle size of high-amylose corn starch is between 80-120 mesh; 5) Drying: Use drying equipment to dry the high-amylose corn starch; ensure the sealing and safety of the drying equipment to prevent heat loss and fire accidents; evenly spread the crushed high-amylose corn starch on the tray or conveyor belt of the drying equipment with a thickness of 2-3 cm; reduce the water content of the high-amylose corn starch to less than 10%; 6) Grinding: Grinding the dried high-amylose corn starch with an ultrafine pulverizer; crushing the high-amylose corn starch into micron-sized particles to improve its solubility and taste; 7) Packaging: Use automatic packaging equipment or manual packaging to pack the ground high-amylose corn starch into packages; control the weight and error of each bag to ensure that the net content of the product meets the standard; seal the packaged products firmly, smoothly and without air leakage. Phenomenon.

2. The method for producing high-amylose corn starch according to claim 1, characterized in that: In step 1, the vibrating screen uses 5mm, 4mm and 3mm screens to classify the corn according to size and remove impurities and broken grains; the de-stoner uses the difference in specific gravity to separate the corn into small pieces. Remove stones from corn; magnetic separator removes magnetic impurities from corn.

3. The method for producing high-amylose corn starch according to claim 2, characterized in that: In step 4), the pulverizing process is to put the treated corn kernels into a pulverizing device for pulverization; the fineness of the high-amylose corn starch is gradually increased by using a multiple pulverization method; each pulverization After crushing, the high-amylose corn starch is screened and the particles that do not meet the particle size requirements are re-crushed.

4. The method for producing high-amylose corn starch according to claim 3, characterized in that: The drying equipment in step 5) is a hot air dryer or a microwave dryer.

5. The method for producing high-amylose corn starch according to claim 4, characterized in that: In step 5), during the drying process, the high-amylose corn starch should be stirred and turned regularly to ensure uniform drying; the high-amylose corn starch after drying is cooled to room temperature before being dried. Perform subsequent processing.

6. The method for producing high-amylose corn starch according to claim 5, characterized in that: Add flour / soybean powder / milk powder / honey to the high amylose corn starch ground in step 6).

7. The method for producing high-amylose corn starch according to claim 6, characterized in that: Wherein the subpackaging described in step 7) is carried out by nitrogen filling Package.

8. A method for planting corn used in any one of claims 1 to 7, characterized in that: The following steps are involved: 1) Corn seed selection: Select corn seeds with a purity of no less than 98%, a germination rate of more than 90%, and a moisture content of 12-14%; 2) Select a planting base: Choose a deep, fertile, loose, well-drained soil with an organic matter content of more than 2%, a total nitrogen content of more than 0.1%, an available phosphorus content of more than 15 mg / kg, an available potassium content of more than 100 mg / kg, and a neutral or slightly acidic soil with a pH value of 6.0-7.5; Areas with an annual average temperature above 10°C, a frost-free period of more than 120 days, sunshine hours of more than 2,000 hours, uniform precipitation, and simultaneous rainfall and heat; 3) Corn field management: sow in spring or summer when the soil temperature is stable above 10℃; before sowing, apply basal fertilizer in combination with deep tillage; the application rate of basal fertilizer is 2000-3000 kg per mu; the application rate of nitrogen, phosphorus and potassium compound fertilizer is 30-50 kg per mu; during the growth period of corn, apply topdressing according to the growth and development stage; in the jointing stage and the large trumpet stage, apply 15-20 kg of nitrogen fertilizer and 10-15 kg of potassium fertilizer per mu to promote stem and leaf growth and ear differentiation; in the filling stage, spray foliar fertilizer on the leaves to increase grain weight and quality; in the seedling stage, keep the soil Moderate drought; watering is carried out during the jointing stage, heading stage and grain filling stage; 4) Corn harvesting and storage: When the milk line of the corn kernels disappears, the black layer appears, and the moisture content drops below 20%, use mechanized harvesting or manual harvesting for harvesting; dry the harvested corn in time to reduce the moisture content to below 14% to prevent mildew and germination; store the dried corn in a dry, ventilated, and cool warehouse to avoid mixing with toxic, harmful, and odorous substances.

9. The corn planting method according to claim 8, characterized in that: In the step 3), a combination of physical control, biological control and chemical control is used to control pests and diseases; physical control uses light trapping and color plate trapping; biological control uses natural enemy insects and beneficial microorganisms for control; and chemical control uses pesticides for spraying.

10. The corn planting method according to claim 9, characterized in that: The step 3) adopts row sowing for sowing; the sowing depth is 3-5 cm, and the planting density per mu is between 3000-5000 plants.

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