Enumeration and Identity of Lactobacilli in Dietary Products 1

Abstract

A medium was developed for selectively enumerating bile-resistant lactobacilli by adding 0.15% oxgall to lactobacillus selective agar (BBL). Lactobacilli were not found in many products sold as sources of Lactobacillus acidophilus , whereas others contained widely different numbers of lactobacilli capable of forming colonies on the bile medium. Of seven products from which lactobacilli were isolated, only three contained L. acidophilus . One of these products was from a pharmacy and the other two were from dairy processor(s).