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2,2'-Diphenyl-1-Picryl-Hydrazyl as a Reagent for the Quantitative Determination of Hydroperoxides

Unilever Research Laboratory, Vlaardingen, The Netherlands

ABSTRACT

The progress of the oxidative deterioration of the unsaturated fatty acids, constituents of lipids found in all foods, may be followed by the determination of the hydroperoxides formed during oxidation. A wide variety of methods has been devised for this purpose, the best known being the iodometric method (4).

The sensitivity of the existing methods for the quantitative determination of hydroperoxides is not very great. Measurements of peroxide values less than 1 mole/kg are feasible only by using either very large samples or elaborate equipment.

Since the spontaneous decomposition of hydroperoxides yields free radicals, a free radical acceptor may be ideally suited for the quantitative determination of hydroperoxides. Such a compound is 2,2'-diphenyl-1-picryl-hydrazyl (DPPH), a stable free radical giving highly colored solutions in various organic solvents.

DPPH is decolorized on reduction. This property of DPPH has been used for measuring the rates of decomposition of various peroxides (1, 2, 5, 7) and hydroperoxides (6) in different solvents.