Hydroperoxide Isomerase

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Abstract
An enzyme has been isolated from flaxseed (Linum usitatissimum) which utilizes the product of lipoxidase for its substrate. The enzyme, termed hydroperoxide isomerase, converts the conjugated diene hydroperoxide of linoleic acid to the corresponding monoenoic ketohydroxy fatty acid. The structure of the latter has been determined by ultraviolet, infrared, and nuclear magnetic resonance spectroscopy; periodate and permangate oxidation; gas chromatography; and thin layer chromatography. Hydroperoxide isomerase activity has also been demonstrated in crude extracts from barley (Hordeum vulgare), wheat germ (Triticum aestivum), mung beans (Phaseolus aureus), and corn (Zea mays) and from partially purified extracts of soybean (Glycine max).