Induced Acid-Tolerance Response Confers Limited Nisin Resistance on Listeria monocytogenes Scott A.

The presence of an inducible acid-tolerance response (ATR) in Listeria monocytogenes Scott A was established. Protection of cells with induced ATR against nisin-mediated inhibition and stress was also evaluated. ATR was induced in L.

Differential Sensitivity of Clostridium botulinum Strains to Nisin is Not Biotype-Associated.

The sensitivities of proteolytic and nonproteolytic Clostridium botulinum strains to nisin and other bacteriocins were investigated. Although there were statistically different nisin sensitivities among vegetative cells from 18 C. botulinum strains, these differences were not biotype-associated.

Bacteriocin Inhibition of Clostridium botulinum Spores by Lactic Acid Bacteria.

Twenty-three strains of lactic acid bacteria were tested by deferred antagonism methods for bacteriocin-like activity against types A and B spores from 11 proteolytic and nonproteolytic Clostridium botulinum strains. Pediococcus pentosaceus ATCC 43200, Pediococcus pentosaceus ATCC 43201, Lactococcus lactis subsp. lactis ATCC 11454, Lactobacillus acidophilus N2, Lactobacillus plantarum Lb75, Lactobacillus plantarum Lb592, and Lactobacillus plantarum BN exhibited bacteriocin-like inhibition of all C.

Acid-Blanching and EDTA Reduce Spoilage and Toxigenesis of Canned Mushrooms Inoculated with Proteolytic Clostridium botulinum Types A and B Spores.

A new process involving acid-blanching and addition of EDTA to the canning brine (ABC) was compared with the standard commercial method (SCM) for the control of Clostridium botulinum spores in canned mushrooms. Fresh mushrooms were uniformly inoculated under vacuum with 10 spores of proteolytic strains of Clostridium botulinum Types A and B and processed either by the ABC or SCM method. Compared to the SCM, the ABC process significantly reduced the spoilage and toxigenesis of canned products.