Effect of environmental stresses on antibody-based detection of Escherichia coli O157:H7, Salmonella enterica serotype Enteritidis and Listeria monocytogenes

Journal of Applied Microbiology
B-K Hahm, Arun K Bhunia

Abstract

To study the reaction patterns of selected antibodies to Escherichia coli O157:H7, Salmonella enterica serotype Enteritidis and Listeria monocytogenes cells exposed to various environmental stresses. Escherichia coli O157:H7, Salmonella Enteritidis and L. monocytogenes cells subjected to different environmental stress of temperatures (4 and 45 degrees C), NaCl (5.5%), oxidative stress (15 mmol(-1) H2O2), acidic pH (5.5) and ethanol (5%) for 3 h (short-term stress) or for 5 days (long-term stress) were analysed by ELISA and Western blotting. The ELISA results indicated that most stresses caused 12-16% reductions in reaction for anti-E. coli O157:H7 and 20-48% reductions for anti-Salmonella polyclonal antibodies during short-term stress, whereas the most stresses exhibited enhanced reaction (44-100% increase) with the anti-L. monocytogenes polyclonal antibody. During long-term stress exposure to combined stress conditions of pH 5.5, 3.5% NaCl at 12 degrees C or at 4 degrees C, antibody reactions to the three pathogens were highly variable with the combined stress at 4 degrees C showing the most reductions (8-40%). Likewise, there were about 18-59% reductions in antibody reactions with pathogens when cultured in hotdog samples wit...Continue Reading

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