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. 1996 Jun;62(6):2117–2121. doi: 10.1128/aem.62.6.2117-2121.1996

Generation of polyclonal antibodies against nisin: immunization strategies and immunoassay development.

A M Suárez 1, J M Rodríguez 1, P E Hernández 1, J I Azcona-Olivera 1
PMCID: PMC167990  PMID: 8787409

Abstract

Murine polyclonal antibodies reactive to the lantibiotic bacteriocin nisin A (nisA) have been produced by immunization with nisA-cholera toxin and nisA-keyhole limpet hemocyanin (nisA-KLH) conjugates. Mice immunized with nisA-cholera toxin developed nisA-specific antibodies with low relative affinities and poor sensitivities, while the immunization of mice with nisA-KLH conjugates resulted in the production of nisA-specific antibodies with high relative affinities and much-increased sensitivities. nisA antibodies could also be readily mass produced in less than 8 weeks in ascites fluid by using the nisA-KLH conjugate. A competitive direct enzyme-linked immunosorbent assay (ELISA) whereby nisA-horseradish peroxidase and free nisA competed for antibody binding was devised. The detection limit for nisA in the competitive direct ELISA with the nisA-KLH-generated antibodies was from 5 to 100 ng/ml, while the amount of free nisA required for 50% antibody binding inhibition ranged from 0.3 to 5 micrograms /ml. Both antisera and ascites polyclonal antibodies cross-reacted with nisZ either in the supernatant of a producer strain or with the pure lantibiotic but did not cross-react at all with non-lantibiotic-type bacteriocins. These polyclonal antibodies should find a wide usage from nisA ELISA analysis in foods and other matrices.

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Selected References

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