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Bulletin of the National Research Centre
Fig. 1 | Bulletin of the National Research Centre

Fig. 1

From: Efficacy assessment of various natural and organic antimicrobials against Escherichia coli O157:H7, Salmonella enteritidis and Listeria monocytogenes

Fig. 1

The Influence of different pH values on bactericidal activity of Thymol against E.coli O157: H7, S. enteritidis, and L. monocytogenes. Thymol concentrations (0, 50, 100, 150, 200, 250 and 300) ppm were each added to 10 ml tryptone soya broth tubes, and then inoculated (50 μl) of an overnight culture of bacterial suspension (O.D 600 = 1.818). Tubes were incubated at 37 °C for 24 h. Negative and positive controls were performed. The optical density of each tube was measured using a spectrophotometer. Data are shown as a mean of two independent experiments with standard error (P < 0.05)

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