Simple soybean meal identification method
Soybean meal is an important vegetable protein source for feed companies. The quality of soy meal directly affects the development of feed enterprises. Therefore, how to identify the raw and cooked soybean meal, whether adulterated is particularly important for feed companies and self-mixed farms. According to many years of experience, several methods of identifying soybean meal in practice are introduced below for reference by peers. One, raw and cooked soybean meal inspection method Because raw soybean meal contains antitrypsin, saponin and other substances, adding to the feed affects the palatability and digestibility of feed, so it is very important to check the raw and cooked soybean meal. The specific operation is as follows: Take 0.1g of urea into a 250ml conical flask, grind the pods to be measured and pulverize them into a urine-contained flask, add 100ml of distilled water, add the stopper and put it in a 45°C water bath, and keep warm for 60 minutes. Take a piece of red litmus paper soaked in a solution in a flask. If the test paper turns blue, it indicates that the soybean meal is raw, and the darker the blue color, the worse the soybean meal is. If the test paper does not change color, the soybean meal is cooked and is available. Second, adulterated soybean meal identification method 1, sensory identification method: This method refers to the human sense organs on the shape of soybean meal, particle size, color, smell, texture and other indicators for identification. In general, pure pods are irregularly fragmented, light yellow to light brown, and have a uniform color. Occasionally, there is a small amount of agglomerates and aroma of beans. Soybean meal mixed with zeolite powder, corn flour and other impurities is light in color and varies in color. More agglomerate, visible white powder, a little smell of beans, such as a large amount of no beans flavor. If the pods are crushed by a pulverizer, the difference in color is even more pronounced, and the dust is large. Put the powdered pods into a glass bottle and the dust will adhere to the bottles. If there is no adulterated pods, there is no such phenomenon. 2, soaking method: Take 25 grams of pod samples to be identified, soak in a 250 ml glass cup for 2-3 hours, and gently stir with a stick. Such as adulterated soybean meal, it can be seen that the soybean meal and the sediment layer, the upper layer is light bean cake, the lower layer is adulterated zeolite powder, sand, mud and so on. 3, iodine identification method: Take a small amount of pods and crush them. Place them in a clean porcelain dish. Lay them flat on top and drip a few drops of iodine. After 1 minute, if there is starchy material such as cornmeal mixed in the pods, the pods will become blue. The above-mentioned several small methods are provided to the on-site feed procurement and staff. If there is any doubt about the soybean meal, we must go to a qualified laboratory and then carefully test it.
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