Abstract
Using commercially available antibodies and toxoids as templates, an ELISA, immuno-quantitative PCR (iqPCR), and multiplex immuno-PCR (iPCR) were developed for detection of Clostridium botulinum neurotoxins A and B. The obtained sensitivities for ELISA ranged from 1 ng/ml in PBS + 1% BSA to 15 and 10 ng/ml in skimmed milk for botulinum neurotoxins (BoNT)/A and BoNT/B, respectively. In semi-fat milk, the limit of detection (LOD) for both toxoids was 30 ng/ml. Quantitative immuno-PCR (iqPCR) had an LOD of 4.5–9 pg/reaction for BoNT/A in both PBS and semi-fat milk, while this was 18.5–37 pg/reaction for BoNT/B in PBS + 1% BSA and semi-fat milk, respectively. The sensitivities of ELISA and iqPCR were improved to 0.5 ng/ml and 3.75 pg/ml (0.2 pg/reaction) in semi-fat milk, respectively, when toxoid of BoNT/A was substituted with actual toxin. Multiplex iPCR with both toxoids run in the same reaction was able to distinguish presence/absence of tested BoNT/A and BoNT/B at 25 pg/reaction. The tested system offers a realistic alternative with much better sensitivity to the standard mouse assay.
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Acknowledgments
The research performed was part of the project RT08/9 (BOTEST) funded by Belgian Federal Public Service Health, Food Chain Safety and Environment. The authors would like to express their gratitude to Mr. Edgard VAN NEROM, as well as Francis TWEEPENNINCKX and Rick NYSSEN for their valuable assistance in the experiments.
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Rajkovic, A., El Moualij, B., Fikri, Y. et al. Detection of Clostridium botulinum neurotoxins A and B in milk by ELISA and immuno-PCR at higher sensitivity than mouse bio-assay. Food Anal. Methods 5, 319–326 (2012). https://doi.org/10.1007/s12161-011-9300-7
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DOI: https://doi.org/10.1007/s12161-011-9300-7