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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 |
|
| 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 |
| Spectrum |
 
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