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Online Edition: "Specifications for Flavourings"

Flavouring 3-(Methylthio)propionaldehyde
Synonym(s) Methional;3-(Methylmercapto)propionaldehyde;beta-(Methylthio)propionaldehyde;beta-Methiopropionaldehyde;beta-(Methylmercapto)propionaldehyde
Latest JECFA evaluation 2000 (Session 55)
Status of specification Full
Chemical name 3-(Methylthio)propionaldehyde
JECFA number 466
CAS number 3268-49-3
FEMA number 2747
COE number 125
FLAVIS number
Molecular weight 104.17
Chemical formula C4H8OS
Physical form/odour colourless to pale yellow liquid; powerful and diffusive onion and meat-like odour; in dilution, more pleasant, less onion-like, remniscient of boullion
Solubility insoluble in water; soluble in alcohol, propylene glycol and oil
Solubility in ethanol 1 ml in 1 ml 95% alcohol
Boiling point (°C) 165-166°
Assay min % 98%
Acid value max 10
Refractive index 1.479-1.493
Specific gravity 1.037-1.052
Other requirements
ID Test IR