The antimicrobial activity of partially purified PlcA was the same as the initial antagonistic activity following exposure to temperatures ranging from 30 ºC to 100 ºC for 10 min,suggesting the relative stability of the bacteriocin.. No antimicrobial activity was lost when PlcA was adjusted to pH values 2 to 10. The antimicrobial activity of PlcA was completely lost when treated with proteinase K and pronase, whereas pepsin, and α-chymotrypsin treatments resulted in the retention of 100 % and 78 % of the initial antagonistic antimicrobial activity, respectively (results not shown).