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Online Edition: "Specifications for Flavourings"

Flavouring Methyl thiobutyrate
Synonym(s) Methylthiol n-butyrate
Latest JECFA evaluation 2000 (Session 55)
Status of specification Full
Chemical name S-Methyl butanethioate
JECFA number 484
CAS number 2432-51-1
FEMA number 3310
COE number 2328
FLAVIS number
Molecular weight 118.19
Chemical formula C5H10OS
Physical form/odour colourless to pale yellow liquid with putrid, rancid, sour, pungent cabbage odour (powerful sweet cheesy odour in dilute solution)
Solubility insoluble in water; miscible in diethyl ether
Solubility in ethanol
Boiling point (°C) 140-143°; 38-40v (12 mm Hg)
Assay min % 98%
Acid value max 1
Refractive index 1.457-1.469
Specific gravity 0.960-0.975
Other requirements
ID Test IR