Monograph: |
L-Cysteine
Cysteine Hydrochloride
White or colourless crystals or crystalline powder. Ph. Eur,
solubilities are: freely soluble in water; slightly soluble in al
cohol: practically insoluble in ether. USP solubilities are: sol-
uble in water, in alcohol, and in acetone.
Cysteine is an aliphatic amino acid. Cysteine and cysteine hy-
drochloride are used as dietary supplements.
Cysteine and cysteine hydrochloride are included in prepara-
tions used in ophthalmology; eye drops have been used to pre-
vent corneal ulceration after chemical burns.
Cysteine, like other sulfhydryl-containing drugs, could pro-
duce a false-positive result in the nitroprusside test for ketone
bodies used in diabetes and suspected hepatocellular injury.
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