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Table 1.

Physiological characterization of four isolates

Isolate name Resistance to acid
pH 2 pH 3 pH 4 pH 5
J1 0.122 ± 0.012a 0.104 ± 0.020 b 0.105 ± 0.019 c 0.624 ± 0.045 d
J5 0.135 ± 0.000 b 0.110 ± 0.010 b 0.111 ± 0.021 c 0.341 ± 0.021 d
J10 0.111 ± 0.001 c 0.094 ± 0.008 b 0.112 ± 0.021 c 0.599 ± 0.008 d
J12 0.764 ± 0.005 d 0.102 ± 0.037 b 0.103 ± 0.034 c 0.296 ± 0.034 d
Bile tolerance
0% 0.05% 0.15% 0.3%
J1 2.137 ± 0.002 a 0.402 ± 0.086 b 0.882 ± 0.065 c 0.648 ± 0.078 d
J5 1.862 ± 0.053 b 0.553 ± 0.066 b 1.165 ± 0.028 c 1.330 ± 0.044 d
J10 2.117 ± 0.084 c 0.525 ± 0.067 b 0.827 ± 0.048 c 1.020 ± 0.030 d
J12 1.466 ± 0.058 d 0.565 ± 0.054 b 1.084 ± 0.071 c 1.253 ± 0.088 d

Results were expressed as a value of O.D. 620. Each value represents the mean value ±standar deviation (SD) (n=4). For each isolate, average values (±SD) within the same row followed by common superscript letters do not differ significantly (P < 0.05).

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