Research Article

Antibacterial Activity of Some Lactic Acid Bacteria Isolated from an Algerian Dairy Product

Table 3

Effect of different treatments on cell-free supernatant and chloroform extract of S. thermophilus T2. Relative activity was measured by an agar diffusion test against Listeria innocua. ( ): no inhibition; (+): slight inhibition; (++): moderate inhibition; (+++): strong inhibition.

TreatmentsRelative activity

Enzymatic treatments

Proteinase K
Pronase E
-chymotrypsin
Trypsin
-amylase
Catalase
Control

pH treatments

4
5
6
7
8
Control

Heat treatments

Control