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Table 5 Resistance to biological barriers for Bifidobacterium mongoliense strains FR 49/F/2 and FR 41/2

From: Detection and characterization of Bifidobacterium crudilactis and B. mongoliense able to grow during the manufacturing process of French raw milk cheeses

Strains Incubation time Resistance to gastric juicea Resistance to pancreatic juiceb Resistance to bile saltsc
pH 2 pH 3 pH 8 1% 0.5% 0.3%
FR49/f/2 T1 h > 3 log 0.02 ± 0.6 0.13 ± 0.35 ND ND ND
T2 h > 3 log 0.05 ± 0.6 0.44 ± 0.05 ND ND ND
T3 h > 3 log 0.05 ± 0.6 0.46 ± 0.03 ND ND ND
T4 h > 3 log 0.16 ± 0.6 0.46 ± 0.06 ND ND ND
T5 h > 3 log 0.04 ± 0.7 0.50 ± 0.07 ND ND ND
T48 h NA NA NA 3.39 ± 0.34 3.07 ± 0.25 1.76 ± 0.13
FR41/2 T1 h > 3 log −0.04 ± 0.7 0.06 ± 0.09 ND ND ND
T2 h > 3 log 0.11 ± 0.8 0.06 ± 0.06 ND ND ND
T3 h > 3 log 0.29 ± 0.7 0.01 ± 0.15 ND ND ND
T4 h > 3 log 0.51 ± 0.6 0.02 ± 0.10 ND ND ND
T5 h > 3 log 0.61 ± 0.7 0.41 ± 0.24 ND ND ND
T48 h NA NA   4.11 ± 0.00 3.93 ± 0.00 4.14 ± 0.00
  1. Decrease in viable cell counts (log CFU ml-1) after exposure: ato low pH (2 and 3) solutions during 1-5 h at 37°C, bto pancreatic juice solution during 1-5 h at 37°C, cto bile salts (1, 0.5 and 0.3% ) during 48 h at 37°C.
  2. NA: not applicable.
  3. ND: not determined.