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Online Edition: "Specifications for Flavourings"

Flavouring L-Cysteine
Synonym(s) alpha-Amino-beta-mercaptopropionic acid;2-Amino-3-mercaptopropionic acid;alpha-Amino-beta-thiolpropionic acid;L-beta-Mercaptoalanine
Latest JECFA evaluation 2004 (Session 63)
Status of specification Full
Chemical name L-Cysteine
JECFA number 1419
CAS number 52-90-4
FEMA number 3263
COE number
FLAVIS number 10.033
Molecular weight 121.16
Chemical formula C3H7O2NS
Physical form/odour White crystals; Sulferous aroma
Solubility Very soluble in water and acetic acid; Insoluble in ether, acetone and benzene
Solubility in ethanol Soluble
Boiling point (°C)
Assay min % 98%
Acid value max
Refractive index
Specific gravity
Other requirements mp: 240°; Sp.rotation = +6.9 to +8.5° (30°)
ID Test MS