The protein in animal products comes from the protein in the feed. The lack of feed materials, especially the lack of protein feed, is the primary factor restricting the development of animal husbandry. The use of amino acids in feed has opened up protein resources other than conventional proteins, and has opened up a way to solve the contradiction between the development of animal husbandry and the lack of protein feed. The amino acids produced by the feed additive industry can easily increase the concentration of essential amino acids in the feed, which not only improves the nutritional value of the feed, but also obtains many other beneficial effects, which makes the industrial amino acid widely used in the feed industry.
Currently, the most widely used amino acids in the feed industry are lysine, methionine, and a small amount of tryptophan and threonine.
L ～ Lysine salt is the L-type optical isomer of lysine, the molecular formula is C6H14N2O5? HCI, the relative molecular weight is 182.65; the appearance is white or light brown crystalline powder, tasteless or slightly special smell, easily soluble in water, It is difficult to dissolve in ethanol and ether, has optical rotation, and has a melting point of 263 ～ 264 ° C. China has formulated a national standard for feed additives L ～ lysine hydrochloride (GB8245 ～ 87).
DL ～ Methionine is also called methionine, the molecular formula is C5H11N02S, the relative molecular mass is 149.22; the appearance is white or light yellow crystals, with a special smell of sulfide; easily soluble in water, dilute acid, dilute alkali, slightly soluble Ethanol, insoluble in ether, melting point 281 ℃ (decomposition). The content of commercial methionine is ≥98.5%. At present, China has not yet formulated a national standard as a feed additive.
Currently there are four main methods for industrial production of amino acids: ① fermentation method; ② chemical synthesis method; ③ enzyme and chemical ~ enzyme method; ④ protein hydrolysis method.
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