METHOD OF SEPARATING MONO HYDRATE OF L-SYSTEINE HYDROCHLORIDE

摘要

A method for sepg. L-systeine hydrochloride monohydrate comprises (a) adding HCl to a soln. contg. L-systeine, L-systine, L-serine and mineral salt until HCl exceeds 15 wt.%; (b) keeping at above 20 deg. C to sep. solid matter contg. L-systine and the salt; (c) cooling to below 10 deg. C to prep. L-systeine hydrochloride monohydrate crystal; and (d) sepg. the L-systeine. The Lsysteine hydrochloride monohydrate is useful as a food and cosmetic additive.