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Online Edition: "Specifications for Flavourings"

Flavouring 2-Mercaptopropionic acid
Synonym(s) 2-Thiolpropionic acid;Thiolactic acid;alpha-Mercaptopropanoic acid
Latest JECFA evaluation 2002 (Session 59)
Status of specification Full
Chemical name 2-Mercaptopropionic acid
JECFA number 551
CAS number 79-42-5
FEMA number 3180
COE number 11790
FLAVIS number
Molecular weight 106.16
Chemical formula C3H6O2S
Physical form/odour colourless to pale yellow liquid with roasted, meaty odour
Solubility miscible in water, alcohol, ether and acetone
Solubility in ethanol 1 mL in 1 mL 95% alcohol
Boiling point (°C) 117°
Assay min % 95%
Acid value max
Refractive index 1.479-1.484
Specific gravity 1.192-1.200
Other requirements mp: 10°
ID Test IR