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Online Edition: "Specifications for Flavourings"

Flavouring Isobutyric acid
Synonym(s) Isopropyl formic acid
Latest JECFA evaluation 1998 (Session 51)
Status of specification Full
Chemical name 2-Methylpropionic acid
JECFA number 253
CAS number 79-31-2
FEMA number 2222
COE number 6
FLAVIS number
Molecular weight 88.11
Chemical formula C4H8O2
Physical form/odour colourless liquid with a strong penetrating odour of rancid butter
Solubility miscible with alcohol, most fixed oils, glycerine and propylene glycol; insoluble in water
Solubility in ethanol
Boiling point (°C) 155°
Assay min % 99.0%
Acid value max
Refractive index 1.392-1.395
Specific gravity 0.944-0.948
Other requirements Reducing Substances: passes test
ID Test IR