Antilisterial Activity of Nisin-Like Bacteriocin-Producing Lactococcus lactis subsp. lactis Isolated from Traditional Sardinian Dairy Products

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 strains	Control	Residual activity against L. monocytogenes ATCC 7644 after enzymes treatment*
		Pronase E	Proteinase K	a-Chymotrypsin	Trypsin	Papain
9FS16	3.7	0	0	2	3.7	3.7
16FS16	3.7	0	0	2	3.7	3.7
9/20234	2.3	0	0	0.8	2.3	2.3
6LS5	3.7	0	0	0.5	3.7	3.7
3LC39	3.0	0	0	0.5	3.0	3.0
1LC18	2.5	0	0	0.7	2.5	2.5
Lc. lactis ATCC 11454^§	2.7	0	0	1.7	2.7	2.7

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