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Detection of Shiga Toxin 2 Produced by Escherichia coli in Foods Using a Novel AlphaLISA

Amplified luminescent proximity homogenous assay-linked immunosorbent assay (AlphaLISA) is comprised of a bead-based immunoassay that is used for small molecule detection. In this study, a novel AlphaLISA was developed and optimized for the detection of Shiga-toxin 2 (Stx2). Efficacy and sensitivity...

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Autores principales: Armstrong, Cheryl M., Ruth, Leah E., Capobianco, Joseph A., Strobaugh, Terence P., Rubio, Fernando M., Gehring, Andrew G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6265734/
https://www.ncbi.nlm.nih.gov/pubmed/30360508
http://dx.doi.org/10.3390/toxins10110422
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author Armstrong, Cheryl M.
Ruth, Leah E.
Capobianco, Joseph A.
Strobaugh, Terence P.
Rubio, Fernando M.
Gehring, Andrew G.
author_facet Armstrong, Cheryl M.
Ruth, Leah E.
Capobianco, Joseph A.
Strobaugh, Terence P.
Rubio, Fernando M.
Gehring, Andrew G.
author_sort Armstrong, Cheryl M.
collection PubMed
description Amplified luminescent proximity homogenous assay-linked immunosorbent assay (AlphaLISA) is comprised of a bead-based immunoassay that is used for small molecule detection. In this study, a novel AlphaLISA was developed and optimized for the detection of Shiga-toxin 2 (Stx2). Efficacy and sensitivity trials showed the AlphaLISA could detect ≥0.5 ng/mL of purified Stx2, which was comparable to the industry-standard enzyme-linked immunosorbent assay (ELISA) tests for Stx2 detection. In addition, evaluation of Shiga toxin-producing Escherichia coli (STEC)-inoculated Romaine lettuce and ground beef samples demonstrated that both the AlphaLISA and the ELISA were able to discern uninoculated samples from 1× and 10× diluted samples containing ~10 CFU/mL of STEC enriched in modified tryptic soy broth with mitomycin C for 16 h. Overall, the increased signal-to-noise ratios indicated a more robust signal was produced by the AlphaLISA compared to the ELISA and the delineation of higher toxin concentrations without the need for sample dilution implied a greater dynamic range for the AlphaLISA. Implementation of the newly developed AlphaLISA will allow for more rapid analysis for Stx2 with less manual manipulation, thus improving assay throughput and the ability to automate sample screening while maintaining detection limits of 0.5 ng/mL.
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spelling pubmed-62657342018-12-07 Detection of Shiga Toxin 2 Produced by Escherichia coli in Foods Using a Novel AlphaLISA Armstrong, Cheryl M. Ruth, Leah E. Capobianco, Joseph A. Strobaugh, Terence P. Rubio, Fernando M. Gehring, Andrew G. Toxins (Basel) Article Amplified luminescent proximity homogenous assay-linked immunosorbent assay (AlphaLISA) is comprised of a bead-based immunoassay that is used for small molecule detection. In this study, a novel AlphaLISA was developed and optimized for the detection of Shiga-toxin 2 (Stx2). Efficacy and sensitivity trials showed the AlphaLISA could detect ≥0.5 ng/mL of purified Stx2, which was comparable to the industry-standard enzyme-linked immunosorbent assay (ELISA) tests for Stx2 detection. In addition, evaluation of Shiga toxin-producing Escherichia coli (STEC)-inoculated Romaine lettuce and ground beef samples demonstrated that both the AlphaLISA and the ELISA were able to discern uninoculated samples from 1× and 10× diluted samples containing ~10 CFU/mL of STEC enriched in modified tryptic soy broth with mitomycin C for 16 h. Overall, the increased signal-to-noise ratios indicated a more robust signal was produced by the AlphaLISA compared to the ELISA and the delineation of higher toxin concentrations without the need for sample dilution implied a greater dynamic range for the AlphaLISA. Implementation of the newly developed AlphaLISA will allow for more rapid analysis for Stx2 with less manual manipulation, thus improving assay throughput and the ability to automate sample screening while maintaining detection limits of 0.5 ng/mL. MDPI 2018-10-23 /pmc/articles/PMC6265734/ /pubmed/30360508 http://dx.doi.org/10.3390/toxins10110422 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Armstrong, Cheryl M.
Ruth, Leah E.
Capobianco, Joseph A.
Strobaugh, Terence P.
Rubio, Fernando M.
Gehring, Andrew G.
Detection of Shiga Toxin 2 Produced by Escherichia coli in Foods Using a Novel AlphaLISA
title Detection of Shiga Toxin 2 Produced by Escherichia coli in Foods Using a Novel AlphaLISA
title_full Detection of Shiga Toxin 2 Produced by Escherichia coli in Foods Using a Novel AlphaLISA
title_fullStr Detection of Shiga Toxin 2 Produced by Escherichia coli in Foods Using a Novel AlphaLISA
title_full_unstemmed Detection of Shiga Toxin 2 Produced by Escherichia coli in Foods Using a Novel AlphaLISA
title_short Detection of Shiga Toxin 2 Produced by Escherichia coli in Foods Using a Novel AlphaLISA
title_sort detection of shiga toxin 2 produced by escherichia coli in foods using a novel alphalisa
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6265734/
https://www.ncbi.nlm.nih.gov/pubmed/30360508
http://dx.doi.org/10.3390/toxins10110422
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