Please read this article. "Probiotic bacteria from 10 different traditional Iranian cheeses: Isolation, characterization, and investigation of probiotic potential"
Please read this article. 1- Al-Saleh A; A. A. M. Metwalli and H. M. Abu-Tarboush (2006). Bile salt and acid tolerance and cholesterol removal from media by some lactic acid bacteria and bifidobacteria. Journal of the Saudi Society for Food and Nutrition, 1: 1-17.
I dissolved different concentration of oxgall (0 -0.7%) in MRS. The growth rat was monitored spectrophotometrically at 620 nm