Food safety and quality: details

Flavouring	Propyleneglycol monobutyrate (mixture of isomers)
Synonym(s)	Butanoic acid, monoester with 1,2-propanediol
Latest JECFA evaluation	2010 (Session 73)
Status of specification	Full
Information required
Chemical name	Mixture of 2-hydroxypropyl butyrate and 1-hydroxypropan-2-yl butyrate
JECFA number	1979
CAS number	29592-95-8
FEMA number	4488
COE number
FLAVIS number
Molecular weight	146.18
Chemical formula	C7H14O3
Physical form/odour	Clear colourless liquid; Mild fruity ethereal aroma
Solubility	Slightly soluble in water
Solubility in ethanol	Soluble
Boiling point (°C)	227-228°
Assay min %	88%
Acid value max	1
Refractive index	1.422-1.430
Specific gravity	0.990-0.998 (20°)
Other requirements	Mixture of isomers: 60-63% 2-Hydroxypropyl butyrate; 28-29% 1-Hydroxypropan-2-yl butyrate; 6-10% Propyleneglycol dibutyrate
ID Test	CNMR HNMR MS
Spectrum