Survival of Lactic Acid Bacteria in a Dynamic Model of the Stomach and Small Intestine: Validation and the Effects of Bile

¹ Hôpital Saint-Lazare INSERM U290, 107^bis Rue du Faubourg Saint-Denis, 75010 Paris, France
² TNO Nutrition and Food Research Institute, PO Box 360, 3700 AJ Zeist, The Netherlands

This study was conducted to validate a dynamic model of the stomach and small intestine to quantify the survival of lactic acid bacteria and to assess the influence of gastrointestinal secretions. The survival of a single strain of each of the following species, Bifidobacterium bifidum, Lactobacillus acidophilus, Lactobacillus bulgaricus, and Streptococcus thermophilus, was measured under physiological conditions (e.g., peristalsis, changes in pH, and changes in concentrations of enzymes and bile) and were compared with data obtained from humans. No significant differences were found between the in vitro and in vivo data, indicating that the model has a predictive value for the survival of these bacteria in humans.

The survival of these strains of lactic acid bacteria in the gastrointestinal model was investigated under two different conditions in the small intestine: simulation of physiological secretion of bile and low bile secretion. Reductions in viability were significantly different between the bacterial species. The dose-response effect of bile on the survival of the tested bacteria was significant, demonstrating the bactericidal effect of bile salts. This study demonstrates the differences among bacterial species in their sensitivity to gastric and intestinal secretions.

Key Words: survival • lactic acid bacteria • gastrointestinal model • bile

Submitted on October 24, 1995
Accepted on November 13, 1996

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