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Inhibitory Effect of Organic Acids upon Meat Spoilage Bacteria

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Abstract:

The relative ability of acetic, benzoic, citric, lactic, propionic, and sorbic acids to inhibit the growth of six common meat spoilage bacteria (Brochothrix thermosphacta, Carnobacterium piscicola, Lactobacillus curvatus, Lactobacillus sake, Pseudomonas fluorescens, and Serratia liquefaciens) was compared under otherwise optimum conditions (BHI or MRS broths; 20°C). Because of their low solubility in the growth media, benzoic and sorbic acids could only be used in low concentrations (below 0.15% [wt/vol]) and did not efficiently inhibit bacterial growth. All other acids totally inhibited growth at concentrations ranging from 0.1 % to 1% (wt/vol). On a weight basis, acetic acid was found to be the most inhibitory, followed by propionic, lactic, and citric acid, while the order of efficiency was reversed (citric > lactic > propionic > acetic) when the acid concentrations were expressed on a molar basis or when the acid effectiveness was evaluated relative to the concentration of undissociated molecules. Overall, the lactobacilli were the bacteria most resistant to the action of organic acids, followed by P. fluorescens and S. liquefaciens, while B. thermosphacta and C. piscicola were considerably more sensitive.

Keywords: BACTERIA; MEAT; ORGANIC ACIDS; SPOILAGE

Document Type: Research Article

Affiliations: 1: Département de Science et technologie des aliments, Faculté des Sciences de l'Agriculture et de l'Alimentation, Université Laval, Québec, Québec, Canada, G1K 7P4 2: Department of Food Science, Faculty of Agricultural and Food Sciences, University of Manitoba, Winnipeg, Manitoba, R3T 2N2 3: Agriculture and Agri-Food Canada, Food Research and Development Centre, 3600 Casavant Blvd. West, St-Hyacinthe, Quebec, Canada, J2S 8E3

Publication date: 1997-03-01

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