Fresh samples of UHTand pasteurized milk were obtained at
a local market. Samples were manipulated under sterile
conditions. An aliquot of cerein 8A (final concentration
160 AU ml−1) was added to each 10 ml milk samples. Then,
L. monocytogenes cells were inoculated to give 104 CFU ml−1.
Heat inactivate bacteriocin (30 min at 100 °C) was added to
control tubes. Milk samples were stored at 4 °C and individual
tubes were removed at 2-day intervals for evaluation of L.
monocytogenes growth using Oxford Listeria selective agar
(Acumedia, Lansing, MI, USA).