The LAB were grown in de Man Rogosa Sharpe (MRS) medium (Oxoid, Milan, Italy) at their optimal temperatures 25 C (KTU05-8 and KTU05-9), 30 C (KTU05-6) or 35 C (KTU05-10 and KTU05-7). 2% of LAB cells were inoculated into a fresh medium and propagated for 18 h. The cells have been harvested by centrifugation (6000 g, 10 min, 4 C). The culture supernatants were filtered through a 0.2 mm sterile Millipore filter to remove all cells and were divided into two parts. One part of supernatants were used for the determination of antimicrobial activities of LAB supernatant (total metabolites), whereas the other part of supernatant samples were adjusted to pH 6.5 with 5 mol l1 NaOH to eliminate the organic acids effect and thus to evaluate potential production of BLIS.