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Online Edition: "Specifications for Flavourings"

Flavouring Mixture of 3,5- and 3,6-Dimethyl-2-isobutylpyrazine
Synonym(s) 2-iso Butyl-3,(5 and 6)-dimethylpyrazine;3,5 and 3,6-Dimethyl-2-isobutyl pyrazine
Latest JECFA evaluation 2012 (Session 76)
Status of specification Full
Chemical name 3,5-Dimethyl-2-(2-methylpropyl)pyrazine and 3,6-Dimethyl-3-(2-methylpropyl)pyrazine
JECFA number 2130
CAS number 38888-81-2;70303-42-3
FEMA number 4100
COE number
FLAVIS number
Molecular weight 164.25
Chemical formula C10H16N2
Physical form/odour Colourless transparent liquid; Roasted woody, meaty aroma with nutty cocoa notes
Solubility Practically insoluble to insoluble in water
Solubility in ethanol Soluble
Boiling point (°C) 73-75° (2 mm Hg)
Assay min % 95%
Acid value max
Refractive index 1.491-1.494
Specific gravity 0.924-0.929
Other requirements 3,5-isomer (48-50%); 3,6-isomer (48-50%)