ABSTRACT
β-galactosidases enzyme have been used in the dairy industry for the improvement of lactose intolerance. The aim of the present study was to isolate β-galactosidase enzyme produced by isolated lactobacillus from milk and cheese. Isolated lactobacilli were cultured on MRS agar. Lactobacilli were identified by Gram staining and standard bacteriological and biochemical methods. Their ability to hydrolyze 5-bromo-4-chloro-3-indolyl-β-Dgalactopyranoside (X-Gal) and O-nitrophenyl- β-Dgalactopyranoside (ONPG) was determined. β-galactosidase enzyme activity was also detected by Sodium Dodecyl Sulphate Gel electrophoresis (SDS-PAGE) method. The colonies that produced blue green color on X-Gal plates were lactobacillus with β-galactosidase enzyme which had ONPG positive results. By adding Lactobacillus producing β-galactosidase enzyme as probiotic to dairy products, could help lactose intolerant infants.