Table 2 Comparison of the antimicrobial activity of cell-free supernatants (CFSs) of Lb. plantarum SF9C and Lb. brevis SF9B, separately and combined, before and after the treatment with proteinase K and high temperature heating, against L. monocytogenes ATCC^® 19111™, S. aureus 3048, E. coli 3014 and S. Typhimurium FP1, determined by agar well-diffusion assay and expressed as the diameter of inhibition zones around the wells (cm)

1.92 ± 0.03^az

1.57 ± 0.06^ay

1.50 ± 0.05^ayw

1.38 ± 0.03^aw

0.00 ± 0.00^ez

0.00 ± 0.00^ez

0.00 ± 0.00^ez

0.00 ± 0.00^fz

1.72 ± 0.03^bz

0.98 ± 0.03^dx

1.13 ± 0.06^cy

1.00 ± 0.00^cx

1.10 ± 0.00^dy

1.17 ± 0.03^cyz

1.23 ± 0.03^bz

1.20 ± 0.00^bxz

0.00 ± 0.00^ez

0.00 ± 0.00^ez

0.00 ± 0.00^ez

0.00 ± 0.00^fz

1.02 ± 0.03^dz

0.90 ± 0.00^dy

0.98 ± 0.03^dz

0.85 ± 0.00^ey

1.68 ± 0.03^bz

1.52 ± 0.03^by

1.30 ± 0.00^bx

1.23 ± 0.03^bx

0.00 ± 0.00^ez

0.00 ± 0.00^ez

0.00 ± 0.00^ez

0.00 ± 0.00^fz

1.53 ± 0.06^cz

0.93 ± 0.06^dx

1.03 ± 0.06^cdy

0.92 ± 0.03^dx