Screening of Bile Salt Hydrolase-Active Lactic Acid Bacteria for Potential Cholesterol-Lowering Probiotic Use

摘要

Cholesterol-lowering effect of lactic acid bacteria (LAB) with bile salt hydrolase activity is well known. In this study, 150 LAB were screened for bile salt deconjugation ability and probiotic characters. Fourteen isolates with higher bile salt deconjugation ability were initially screened out using deconjugation rate above 50% as standard. These isolates were further screened for adhesion to HT-29 cells, bile tolerance and acid resistance. Four isolates, namely Lactobacillus casei F0822, Lactobacillus casei F0422, Enterococcus faecium F0511 and Enterococcus faecium IN7.12, was finally screened out. The 4 isolates may be able to reduce serum cholesterol levels in human and thus have a potential to apply in the biomedicine field.