FIGURE 4.
Biofilm formation of LAB using the microtiter plate assay. After incubation at 30°C for 48 h in MRS media. Data are mean ± standard deviations. The cut-off (ODC) was defined as the mean OD value of the negative control. Based on the OD, strains were classified as non-biofilm producers (OD ≤ ODC), weak (ODC < OD ≤ 2 × ODC), moderate (2 × ODC < OD 4 × ODC) or strong biofilm producers (4 × ODC < OD).