Table 2: Enzyme sensitivity of the antibacterial compounds produced by the six Lactococcus lactis subsp. lactis determined by well-diffusion assay. Results are expressed as mean ± standard deviation of three independent experiments.

Producer strainsControlResidual activity against L. monocytogenes ATCC 7644 after enzymes treatment*
Pronase EProteinase Ka-ChymotrypsinTrypsinPapain

9FS163.70023.73.7
16FS163.70023.73.7
9/202342.3000.82.32.3
6LS53.7000.53.73.7
3LC393.0000.53.03.0
1LC182.5000.72.52.5
Lc. lactis ATCC 11454§2.7001.72.72.7

*Inhibition zone in mm.
§Nisin A-producer.