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Inhibitory effect of D-tryptophan on the viable counts of E. coli O26 inoculated into PYG media (A) at 4 °C at various concentrations of D-Trp. 0 mM (solid line), 20 mM (dotted line), 30 mM (dashed line), and 40 mM (dot-dashed line), (B) at room temperature (25 °C) at 40 mM D-Trp (0 mM D-Trp, □; 40 mM D-Trp, Ο). Values are the mean ± standard deviation of three independent trials. Values with different letters are significantly different (p < 0.05).
