Five storage methods of the hottest grains and oil

Storage methods of various cereals and oils (V)

(V) soybeans and soybean oil

1. Storage characteristics of soybeans

(1) soybeans have strong hygroscopicity, thin seed coat of moldy soybeans, and large germination holes. Generally, heat shrinkable film and tensile film have higher requirements on the tensile properties of materials, and the hygroscopic capacity is stronger than that of wheat and corn. After moisture absorption and moisture return, soybeans expand in volume and are very easy to mold. At first, the beans are soft, the seed coat is gray and white, and there is a slight peculiar smell. Then the beans swell and deform, the umbilicus is red, and the broken grains appear colonies, and the quality deteriorates sharply

(2) soybeans are easy to lose oil and turn red. After storage in high temperature season, the color of two cotyledons near the umbilicus often turns red, and then the cotyledons turn red and expand, seriously soaking in oil. At the same time, high temperature and high humidity also reduce the germination capacity of soybeans. After soybean turns red, the oil yield decreases, the color of soybean oil deepens, tofu tastes rancid, and soybean milk turns red

2. Storage methods of soybeans

(1) strictly control the storage moisture of soybeans. The long-term storage moisture of soybeans should not exceed 12%. After the soybean is harvested, it should be fully dried on the pod and then threshed. Soybeans with high moisture content after warehousing can be treated by sunlight, but they can only be warehoused after cooling

(2) timely ventilation, heat dissipation and moisture dissipation. The moisture between newly stored soybeans is uneven. Coupled with the post ripening effect of soybeans, moisture and heat in the pile are easy to accumulate, causing fever and mildew. Therefore, timely ventilation, heat dissipation and moisture dissipation are necessary

(3) after low-temperature closed storage enters winter, ventilation and cooling should be strengthened, and gland or plastic film closed storage should be used before spring is warm, which can generally safely spend summer

3. Storage of soybean oil during storage, soybean oil is prone to rancidity and deterioration due to the influence of moisture, impurities, ambient air, light, temperature and other factors contained in the oil itself, including China's largest overseas investment merger and acquisition - China Chemical Group Corporation, which acquired Syngenta, a Swiss agrochemical producer, at a price of US $43billion (about 289billion yuan). Therefore, the moisture and impurity content of soybean oil must be reduced as much as possible, stored in sealed containers and placed in places away from light and low temperature. The general practice is that before the oil products are put into storage or barrel, the fittings must be cleaned and wiped dry, and the water, impurity content and acid value of the oil products must be carefully inspected. Only those who meet the eight safe storage requirements can be put into storage. The content of water and impurities in soybean oil shall not exceed 0.2%, and the acid value shall not exceed 4. The barreled oil should not be too much or too little. After installation, put a rubber band or hemp thread under the lid and tighten the lid to prevent rain and air from invading. At the same time, the name, grade, tare weight, net weight and barrel filling date of oil products should be marked on each barrel in time, so as to discuss with customers the most innovative packaging shape, materials and design process, classified storage and new storage. Barrels of oil products should be stacked in the warehouse. If they need to be stacked in the open air, wood blocks should be padded at the bottom of the barrel to make it stand obliquely, and the mouth of the barrel should be lined up to prevent rust at the bottom of the barrel and rain water from immersing from the mouth of the barrel; In high temperature season, put up a shed for shade to prevent heat rancidity; In severe winter, in areas with low temperature, whether stored in the open air or in the warehouse, straw, chaff and other oil drums should be padded around to strengthen heat preservation and prevent oil from solidification