Food safety and quality
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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 |
Information required |
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Chemical name |
L-Cysteine |
JECFA number |
1419 |
CAS number |
52-90-4 |
FEMA number |
3263 |
COE number |
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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) |
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Assay min % |
98% |
Acid value max |
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Refractive index |
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Specific gravity |
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Other requirements |
mp: 240°; Sp.rotation = +6.9 to +8.5° (30°) |
ID Test |
MS |
Spectrum |
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