Development and evaluation of sandwich ELISA for detection and quantification of Staphylococcal enterotoxin-A in food

Author:

Singh Mamta1,Agrawal Ravi Kant1,Singh Bhoj Raj1,Mendiratta Sanjod Kumar1,Kumar Deepak1,Kumar Bablu1,Singh Mithilesh Kumar1

Affiliation:

1. ICAR-Indian Veterinary Research Institute

Abstract

Abstract Purpose Staphylococcus aureus is an opportunistic zoonotic organism which secretes around 23 different types of enterotoxins. Classical enterotoxins (SEA, SEB, SEC, SED and SEE) are responsible for >95 % of food poisoning outbreaks of which SEA alone is responsible for >75% of them. The present study was undertaken to develop sandwich ELISA forsensitive, specific and quantitative detection of Staphylococcal enterotoxins-A in food samples. Methods Optimization of sandwich ELISA was attempted in two ways. In first, rabbit polyclonal anti-SEA was used as capture antibody and mouse monoclonal anti-SEA as detector antibody, in second, mouse monoclonal anti-SEA was used as capture Antibody and rabbit polyclonal anti-SEA as detector antibody. Results In the optimization of sandwich ELISA, mouse monoclonal anti-SEA as capture antibody and rabbit polyclonal anti-SEA as detector antibody yieldedhighest sensitivity of 0.5-0.75 ng ml-1. The developed assay was found to be highly specific and having equivalent sensitivity to available commercial kits. Conclusion The developed sandwich ELISA may be utilized as a sensitive, specific and quantitative test for detection of Staphylococcal enterotoxin-A in food samples. The developed ELISA may serve as a cheap alternative to commercial kits which need importation and therefore are relatively costly. The sandwich ELISA developed may be useful for microbiological quality assurance of foods specially in developing countries.

Publisher

Research Square Platform LLC

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1. A comprehensive review on the detection of Staphylococcus aureus enterotoxins in food samples;Comprehensive Reviews in Food Science and Food Safety;2023-12-13

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