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Appl Environ Microbiol. 1994 August; 60(8): 2692-2696

Monoclonal antibody-based enzyme immunoassay for pediocins of Pediococcus acidilactici.

Department of Food Science, University of Arkansas, Fayetteville 72703.

ABSTRACT

Monoclonal antibody (MAb) R2-AR against pediocin RS2 was developed. Mice were immunized for 12 weeks with pediocin RS2 conjugated to a polyacrylamide gel. Two hybridoma fusions yielded an MAb that in Western blots (immunoblots) reacted only with pediocins RS2 and AcH (3 kDa) from Pediococcus acidilactici RS2 and H, respectively, and did not react with any other bacteriocin, including sakacin A from Lactobacillus sake Lb 706, leuconocin LCM1 from Leuconostoc carnosum LM1, nisin from Lactococcus lactis ATCC 11454, and pediocin A from Pediococcus pentosaceus FBB61. Each of the bacteriocin bands on sodium dodecyl sulfate-polyacrylamide gel electrophoresis gels was confirmed to be biologically active by a gel overlay test performed with sensitive indicator organisms. In dot immunoblot assays, the MAb could detect a minimum of 32,000 arbitrary units of pediocin RS2 or AcH per ml. In colony immunoblot assays, the MAb was used successfully to differentiate bac+ and bac- variants of P. acidilactici RS2 strains.

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