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A log reduction (6 h) of Escherichia coli strain mixture with and without acetic acid (A), malic acid (B), and citric acid (C) at 25°C and a pH of 3.2. Ionic strength was held constant at 0.60 to 0.68 M by adding NaCl. The error bars represent the standard deviations for three or more trials. The identical letters over the error bars indicate no significant difference between treatments (P > 0.05).
