A: Listeria monocytogenes contaminated lean fish (Podamassys jubelini) fillet immersed in the substrate seeded (solid line) or not (broken line) with the nisinogenic living culture.
B: Listeria monocytogenes contaminated fatty fish (Arius heudelotii) fillet immersed the substrate seeded (solid line) or not (broken line) with the nisinogenic living culture.
*: Similar results were obtained with nisin-producing starter culture of Lactococcus lactis subsp. lactis CWBI-B1426
Figure 1: Evolution of pH (●, ○), Lactic acid bacteria (■, □) and Listeria monocytogenes (▲, Δ) cell population in fish previously contaminated with 104-5 CFU/g of a nisin sensitive Listeria monocytogenes strain, and immersed in millet--based substrate seeded or not (control samples) with 106-7 CFU/g nisinogenic Lactococcus lactis subsp. lactis CWBI-B1410* living culture, during incubation at 30°C.
The data are the mean ± standard deviation from duplicate trials performed on different samples at different times.