Propyl gallate, or propyl 3,4,5-trihydroxybenzoate CAS 121-79-9 is an ester formed by the condensation of gallic acid and propanol. Since 1948, this antioxidant has been added to foods containing oils and fats to prevent oxidation.

Specification
Character                           White crystalline powder
Appearance of solution        Clear and not more intensively coloured than Bys
Gallic acid,%                      ≤0.5
Total chlorine,ppm              ≤200
Chlorides,ppm                    ≤100
Zinc,ppm                           ≤25
Heavy metal(as Pb),ppm     ≤10
Sulphate ash,%                  ≤0.1
Assay,%                             97.0-103.0
Melting point,℃                  148-151
Loss on drying,%                ≤0.5

Application

1. Propyl gallate is used to protect oils and fats in products from oxidation; it is used in foods, cosmetics, hair products, adhesives, and lubricants.

2.It is used as a triplet state quencher and an antioxidant in fluorescence microscopy.
Storage
sealed container, in dark place, no contact with metals.

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