Combined effects of nisin, lactic acid, and potassium sorbate on Bacillus licheniformis spores in milkEffets combinés de la nisine, de l'acide lactique et du sorbate de potassium sur les spores de Bacillus licheniformis dans le lait

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Issue		Lait Volume 78, Number 1, 1998 8^th Meeting of the " Club des Bactéries Lactiques ".


Page(s)		117 - 128
DOI		http://dx.doi.org/10.1051/lait:1998115

Lait 78 (1998) 117-128
DOI: 10.1051/lait:1998115

Effets combinés de la nisine, de l'acide lactique et du sorbate de potassium sur les spores de Bacillus licheniformis dans le lait

Marianne Mansour^a, Michel Linder^b, Jean-Bernard Millière^a and Gérard Lefebvre^a

^a Laboratoire de fermentations et bioconversions industrielles
^b Laboratoire de physico-chimie et génie alimentaires, Ensaia-INPL, 2, avenue de la Forêt-de-Haye, 54500 Vandoeuvre-lès-Nancy, France

Abstract - Combined effects of nisin, lactic acid, and potassium sorbate on Bacillus licheniformis spores in milk
The inhibitory activities of nisin and / or potassium sorbate on Bacillus licheniformis spores were studied in milk acidified with lactic acid, at 37 °C. Three experimental plans were realized using the Doehlert uniform shell design. Spore germination, pH-dependent, was enhanced as the pH increased. Nisin had no sporicidal effect, but inhibited the growth of ger-minated spores. Its bactericidal activity increased with the concentration of nisin and as the pH and the initial spore load decreased. Potassium sorbate was not sporicidal but disturbed the spore germination at high concentrations and low pH values. Its bactericidal effect was favoured at acidic pH values. Nisin and sorbate potassium in association enhanced the bactericidal effect with an important inhibition at high pH values. © Inra / Elsevier, Paris.

Résumé - Les activités inhibitrices de la nisine et / ou du sorbate de potassium sur les spores de Bacillus licheniformis sont étudiées dans du lait acidifié avec de l'acide lactique, à 37 °C. Trois plans d'expériences sont réalisés selon les réseaux uniformes de Doehlert. La germination des spores, pH-dépendante, est favorisée aux valeurs proches de la neutralité. La nisine, non sporicide, est bactéricide sur les spores germées ; cette activité augmente avec la concentration en nisine, lorsque le pH et la concentration initiale en spores diminuent. Le sorbate de potassium, sans action sporicide, retarde la germination aux concentrations élevées et à pH acide. Son activité bactéricide est favorisée à pH acide. L'association de la nisine et du sorbate de potassium augmente le pouvoir bactéricide avec une inhibition maximale aux pH proches de la neutralité. © Inra / Elsevier, Paris.

Key words: Bacillus licheniformis / spore / nisin / potassium sorbate / lactic acid

Mots clés : Bacillus licheniformis / spore / nisine / sorbate de potassium / acide lactique

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