Viability and βGalactosidase Activity of Dairy propionibacteria Subjected to Digestion by Artificial Gastric and intestinal Fluids

摘要

An important criterion to consider in the selection of strains for dietary adjuncts is the ability of the microorganisms to survive the severe conditions of acidity and bile concentrations usually found in the gastrointestinal tract. In the present work, we report the effects of digestions by artificial gastric and intestinal fluids on β-galactosidase activity an survival of four strains of dairy preopionibacteria previously select by their bile tolerance and β-galactosidase activity and survival of four strains of dairy propionibateria previously select by their bile tolerance and B-galactosidase activity. The strains were exposed to artificial gastric juice at pH values between 2 and 7 and then subjected to artificial intestinal digestion.