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A log reduction (6 h) of E. coli strain mixture in d-lactic acid, l-lactic acid, or without added acid 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).
