What are the common ways to obtain L-tyrosine?

L-tyrosine is a non-essential amino acid, which can be used in medicine, food, daily chemical, and biochemical research, and other fields. Its appearance is a white powder, slightly bitter, odorless. L-tyrosine is soluble in acid and base solutions, but insoluble in anhydrous ethanol, acetone, and ether. Its molecular formula is C9H11NO3, molecular weight is 181.19, CAS number is 60-18-4, and EINECS number is 200-460-4.

Since L-tyrosine can inhibit citric acid synthase in the posterior cortex, it is often used in the production of medicine and as a raw material in the field of the chemical industry. There are many ways to obtain L-tyrosine. For example, casein is used as raw material, reflux in hydrochloric acid for several hours, and then L-tyrosine is obtained by filtration, concentration, alkali neutralization, activated carbon treatment, and crystallization. With proteins such as silk and casein as raw materials, the products obtained after acid hydrolysis are separated by neutralization and precipitation, dissolved by dilute ammonia, neutralized by acetic acid to reach pH 5, and recrallized to obtain L-tyrosine. In addition, L-tyrosine can also be obtained by separating and purifying raw materials such as cow horn hoofs and pig blood meal after acidification.

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