Abstract
The naturally occurring complex organic acids, chlorogenic acid, gallic acid and quinic acid, at concentrations of 100, 500 and 1000 mg l-1 were evaluated for effects on the growth of three spoilage strains of Lactobacillus collinoides and one of Lact. brevis in acid tomato broth containing 5% (v/v) ethanol at pH 4.8. During early stages of growth, all the complex acids at each concentration stimulated growth of Lact. collinoides but not of Lact. brevis. During stationary phase, chlorogenic and gallic acids produced greater cell densities of all strains, whereas quinic acid generally had less effect. The presence of these complex acids in fruit products may increase the requirement for added preservative in order to prevent spoilage by certain strains of lactic acid bacteria.
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