di Al222 (25419 pt) · 26-Apr-2023
E920 (L-cysteine) L-cysteine is an optically active L-form of cysteine. It is obtained industrially from animal products (keratin), but can also be obtained by hydrolysing human hair. Cysteine is the α-mercaptomethyl (α-thiomethyl)-substituted amino...
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