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. 2019 Mar 31;20(7):1610. doi: 10.3390/ijms20071610

Figure 1.

Figure 1

Acid resistance and impact of growth phase on resistance. Panel (a): overnight MRS cultures of L. acidophilus ATCC 4356 (♦ and ■) and L. paracasei GCRL 46 (▲ and X) were diluted into MRS at pH 2 (dashed lines) or 2.5 (solid lines) and viable counts determined every 30 min to determine % survivors relative to time zero. Panel (b): strain GCRL 46 was cultured in fermenters without pH control, growth monitored by OD600 (♦) and samples taken after inoculation then hourly to determine % survivors (X) after 2 h in MRS broth at pH 2.5.