Food safety and quality: details

Flavouring	L-Cysteine methyl ester hydrochloride
Synonym(s)	Methyl (R)-2-amino-3-mercaptopropanoate hydrochloride; Mecysteine hydrochloride; laevo-cysteine methyl ester hydrochloride
Latest JECFA evaluation	2020 (Session 89)
Status of specification	Full
Information required
Chemical name	Methyl (2R)-2-amino-3-sulfanylpropanoate;hydrochloride
JECFA number	2270
CAS number	18598-63-5
FEMA number	4781
COE number
FLAVIS number
Molecular weight	171.65
Chemical formula	C4H9NO2S:HCl
Physical form/odour	White powder; Sulfur-like odour
Solubility	Soluble
Solubility in ethanol	Soluble
Boiling point (°C)
Assay min %	95%
Acid value max
Refractive index
Specific gravity
Other requirements	mp: 140-141° Optical rotation: -1.5° to -3.2° (20 °C, 589 nm) (c=5 g/100 mL, 1 N HCl)
ID Test	HNMR CNMR
Spectrum