2.6. Antimicrobial activity using microtiter plates
The antimicrobial activity of LAB isolates was determined using method of MCVay and Rolfe (2000) with some mod- ifications. The cell free supernatant (CFS) obtained by har- vesting 24 h old cultures from MRS broth by centrifugation (using Eppendorf Centrifuge 5816) at 4000 g, 15 min at 4 1C was sterilized through 0.22 μm filter. Further, CFS was serially diluted in BHI broth to prepare 1:1, 1:10 and 1:100 dilutions; and from each dilution 100 μl CFS was added into the wells of microtiter plate in triplicates and allowed to equilibrate at room temperature for 15 min