Propyl, octyl and dodecyl gallates are determined absorptiometrically in a sodium acetate buffer solution with ferrous tartrate, which is specific for the gallates. After solution of the fat in light petroleum, propyl gallate is extracted with water and the higher gallates with absolute methanol. The conditions governing the reaction were studied. With the extraction methods described a 95 to 97 per cent. recovery of antioxidant from oils and fats was possible.
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Vos et al. (1957) studied this question.
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