Waters, Sinead M., Doyle, Sean, Murphy, Richard A. and Power, Ronan F.G. (2005) Development of solution phase hybridisation PCR-ELISA for the detection and quantification of Enterococcus faecalis and Pediococcus pentosaceus in Nurmi-type cultures. Journal of Microbiological Methods, 63 (3). pp. 264-275. ISSN 0167-7012
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Abstract
Nurmi-type cultures (NTCs), derived from the fermentation of caecal contents of specifically pathogen-free (SPF) birds,
have been used successfully to control salmonella colonisation in chicks. These cultures are undefined in nature and,
consequently, it is difficult to obtain approval from regulatory agencies for their use as direct fed microbials (DFMs) for poultry.
Progress towards the generation of effective defined probiotics requires further knowledge of the composition of these cultures.
As such, species-specific, culture-independent quantification methodologies need to be developed to elucidate the concentration
of specific bacterial constituents of NTCs. Quantification of specific bacterial species in such ill-defined complex cultures using
conventional culturing methods is inaccurate due to low levels of sensitivity and reproducibility, in addition to slow turnaround
times. Furthermore, these methods lack selectivity due to the nature of the accompanying microflora.
This study describes the development of a rapid, sensitive, reliable, reproducible, and species-specific culture-independent,
solution phase hybridisation PCR-ELISA procedure for the detection and quantification of Enterococcus faecalis and
Pediococcus pentosaceus in NTCs. In this technique, biotin-labelled primers were designed to amplify a species-specific
fragment of a marker gene of known copy number, in both species. Resulting amplicons were hybridised with a dinitrophenol
(DNP)-labelled oligonucleotide probe in solution and were subsequently captured on a streptavidin-coated microtitre plate. The
degree of binding was determined by the addition of IgG (anti-DNP)–horseradish peroxidase conjugate, which was
subsequently visualised using a chromogenic substrate, tetramethylbenzidine. This novel quantitative method was capable of
detecting E. faecalis and P. pentosaceus at levels as low as 5 CFU per PCR reaction.
Item Type: | Article |
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Keywords: | Caecal contents; Enterococcus faecalis; Nurmi; PCR-ELISA; Pediococcus pentosaceus; |
Academic Unit: | Faculty of Science and Engineering > Biology Faculty of Science and Engineering > Research Institutes > Institute of Immunology |
Item ID: | 2175 |
Identification Number: | 10.1016/j.mimet.2005.03.016 |
Depositing User: | Dr. Sean Doyle |
Date Deposited: | 11 Oct 2010 13:10 |
Journal or Publication Title: | Journal of Microbiological Methods |
Publisher: | Elsevier |
Refereed: | Yes |
Related URLs: | |
URI: | https://mural.maynoothuniversity.ie/id/eprint/2175 |
Use Licence: | This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here |
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