Abstract
Sodium lactate (5%) used in neutral culture media has an antimicrobial effect which rises above that what would be expected from its water activity lowering effect. This antimicrobial effect was found to exist towards various lactic acid bacteria, Staphylococcus aureus, and Salmonella typhimurium. It is particularly evident from increased lag phase, decreased growth yield, and somewhat less from decreased growth rate. Adverse growing conditions, such as suboptimum temperature, increase its anti-microbial effect. Escherichia coli is an exception, as its growth rate is hardly affected by 5% sodium lactate, although its growth yield is lowered. The antimicrobial activity of sodium lactate evidently reflects how various micro-organisms can cope with this compound.
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