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Table 2 In vitro effects of pH, lactic and acetic acids on Pseudomonas aeruginosa PAO1 growth

From: Screening of Lactobacillus spp. for the prevention of Pseudomonas aeruginosa pulmonary infections

Acid concentrations (mM) OD595nmof P. aeruginosa at different pH and acid concentrations*
Lactic acid pH 7 pH 6 pH 5 pH 4
0 0.60 ± 0.03 0.62 ± 0.01 0.43 ± 0.02 0.01 ± 0.00
50 0.74 ± 0.06 0.81 ± 0.11 0.47 ± 0.19 0.12 ± 0.01
100 0.65 ± 0.02 0.65 ± 0.02 0.23 ± 0.07 0.12 ± 0.01
Acetic acid pH 7 pH 6 pH 5 pH 4
0 0.60 ± 0.03 0.62 ± 0.01 0.43 ± 0.02 0.01 ± 0.00
12.5 0.70 ± 0.06 0.58 ± 0.02 0.38 ± 0.27 0.12 ± 0.01
25 0.63 ± 0.06 0.65 ± 0.09 0.11 ± 0.01 0.12 ± 0.00
50 0.56 ± 0.02 0.26 ± 0.07 0.11 ± 0.01 0.12 ± 0.01
100 0.77 ± 0.14 0.10 ± 0.01 0.11 ± 0.01 0.13 ± 0.01
  1. * Each value is the mean of triplicates ± SD (ANCOVA), P. aeruginosa was incubated in BHI medium for 22 h in presence of different acid concentrations (acetic, lactic acid or HCl).