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Appl. Environ. Microbiol., Jul 1997, 2654-2659, Vol 63, No. 7
Copyright © 1997, American Society for Microbiology

Nisin Resistance in Clostridium botulinum Spores and Vegetative Cells

AS Mazzotta, AD Crandall and TJ Montville
Department of Food Science, New Jersey Agricultural Experiment Station, Cook College, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903

The frequencies at which vegetative cells and spores of Clostridium botulinum strains 56A, 62A, 17409A, 25763A, 213B, B-aphis, and 169B formed colonies on agar media containing 0, 10(sup2), 10(sup3), and 10(sup4) IU of nisin per ml at 30(deg)C were determined. Strain 56A had the highest frequencies of nisin resistance, while strains 62A, 169B, and B-aphis had the lowest. For most strains, spores were more resistant than vegetative cells. One exposure to nisin was sufficient to generate stable nisin-resistant isolates in some strains. Stepwise exposure to increasing concentrations of nisin generated stable resistant isolates from all strains. Spores produced from nisin-resistant isolates maintained their nisin resistance. The frequency of spontaneous nisin resistance was reduced considerably by lowering the pH of the media and adding 3% NaCl. Nisin-resistant isolates of strains 56A and 169B also had increased resistance to pediocin PA1, bavaricin MN, plantaricin BN, and leuconocin S.

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