What methods can be used to prepare L-tyrosine?

L-tyrosine is a white powder, odorless, but bitter in taste. It is soluble in dilute acids and bases, but insoluble in anhydrous ethanol, ether, and acetone. L-tyrosine can not only be used as nutrient enhancer and moisturizer in food, feed, medicine, health care products, daily chemicals and other fields, but also used in biochemical research.

L-tyrosine can be obtained from various raw materials, such as casein, casein, silk, pig blood meal, silk, horn and hoof, etc., which can be used as raw materials for the preparation of L-tyrosine. With casein as raw material, reflux in hydrochloric acid for several hours after filtration, concentration, alkali neutralization, activated carbon treatment, crystallization and other treatment can get L-tyrosine. With casein or silk protein as raw materials for hydrolysis, neutralization reaction, precipitation separation, dissolved in dilute ammonia, acetic acid neutralization, and then adjust the PH value to 5, through recrystallization to get L-tyrosine. The l-tyrosine can be obtained from pig blood meal, ox horn hoof and silk by proteolytic extraction.

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