At temperatures below 10°C, lactic milk flora is no longer
dominant, and other micro-organisms considered harmful
in cheese such as psychrotrophic become dominant
(Le Jaouen, 1993). The lactic acid bacteria can produce
numerous antimicrobial metabolites such as organic acids,
hydrogen, carbon dioxide, reuterin, diacetyl peroxide and
bacteriocins. These last are antimicrobial peptides which
inhibit the growth of spoilage bacteria or pathogens(Dortu
and Thonart, 2009). In food industry, only Lactococcus
lactis’s nisin is permitted as a food additive (E 234) since
1969 by WHO (World Health Organization). According
to the Generally Recognized As Safe (GRAS), nisin inherit