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Cysteine hydrochloride is colorless to white crystalline or crystalline powder, with a slightly special sour smell, melting point 175℃ (decomposition). Soluble in water, the aqueous solution is acidic, the pH value of 1% solution is about 1.7, and the pH value of 0.1% solution is about 2.4. It can also dissolve in alcohol, ammonia and acetic acid, insoluble in ether, acetone, benzene and so on. It is reductive, antioxidant and prevents non-enzymatic Browning.
Property and stability
It is hygroscopic. Slowly oxidizes and decomposes in air. The aqueous solution is acidic.
Storage method
Should be sealed in a cool dry place away from light storage.
Synthesis method
1. Dissolve cystine in dilute hydrochloric acid, filter and add tin granules to heat up reflux. Dilute the reducing solution with water, remove the remaining tin particles, saturate with hydrogen sulfide, filter, wash the filter residue with a small amount of water, combine the lotion and filtrate, concentrate under reduced pressure, cool and crystallize, and dry L-cysteine hydrochloride.
2. Cystine can be obtained by hydrolysis of α-keratin contained in hair, and then reduced to cysteine by chemical reduction or electrolytic reduction, and then added hydrochloric acid to salt.
Manufacturing
