Each microbial culture was transferred individually to 5 ml of deMan Rogosa Sharpe medium (MRS broth, Difco) for lactic acid bacteria, Tryptic soy broth (TSB, Difco) for other bacteria and Saboraud dextrose broth (SDB, Difco) for yeasts. Cultures of bacteria and yeasts were incubated at 37 and 30° C for 24 and 72 h, respectively.