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An inhibitor of plant lipoxygenase from culture filtrates of Lactobacillus casei was purified by column chromatography and shown to be benzoic acid. The isolated benzoic acid had an IC^sub 50^ of 350 μM against purified soybean lipoxygenase at pH 9. L. casei therefore may have the potential to be used as a preservative against the oxidation of unsaturated fatty acids, thereby preventing undesirable flavours in foods.[PUBLICATION ABSTRACT]