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Behavior of Burkholderia thailandensis (Burkholderia pseudomallei surrogate) in Acidified Conditions by Organic Acids Used in Ready-to-Eat Meat Formulations under Different Water Activities
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 Title & Authors
Behavior of Burkholderia thailandensis (Burkholderia pseudomallei surrogate) in Acidified Conditions by Organic Acids Used in Ready-to-Eat Meat Formulations under Different Water Activities
Yoon, Yo-Han;
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This study evaluated the antimicrobial effects of meat processing-related organic acids on Burkholderia thailandensis (Burkholderia pseudomallei surrogate) with different water activities. B. thailandensis KACC12027 (4 log CFU/mL) was inoculated in microwell plates containing tryptic soy broth pH-adjusted to 4, 5, 6, and 7 with ascorbic acid, citric acid, and lactic acid and with water activities adjusted to 0.94, 0.96, 0.98, and 1.0 with NaCl, followed by incubation at for 30 h. The optical density (OD) of the samples was measured at 0, 3, 6, 12, 24, and 30 h at 595 nm to estimate the growth of B. thailandensis. Growth of B. thailandensis was observed only at water activity of 1.0. In general, more bacterial growth (p<0.05) was observed at pH 6 than at pH 7, and the antimicrobial effects of the organic acids on B. thailandensis were in the following order: Ascorbic acid > lactic acid > citric acid after incubation at for 30 h. These results indicate that organic acids in meat processing-related formulations should be useful in decreasing the risk related to an emerging high risk agent (B. pseudomallei).
Burkholderia thailandensis;Burkholderia pseudomallei;dissociation constant;
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