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Sensors 2012, 12(2), 2324-2339;

A Bioanalytical Platform for Simultaneous Detection and Quantification of Biological Toxins

Laboratory of Food Microbiology, Institute of Food, Nutrition and Health (IFNH), ETH Zurich, Schmelzbergstrasse 7, 8092 Zurich, Switzerland
Toxinology Group, SPIEZ LABORATORY, 3700 Spiez, Switzerland
Arrayon Biotechnology SA, Jaquet-Droz 1, 2002 Neuchâtel, Switzerland
Author to whom correspondence should be addressed.
Received: 10 January 2012 / Revised: 9 February 2012 / Accepted: 20 February 2012 / Published: 21 February 2012
(This article belongs to the Special Issue Bioassays)
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Prevalent incidents support the notion that toxins, produced by bacteria, fungi, plants or animals are increasingly responsible for food poisoning or intoxication. Owing to their high toxicity some toxins are also regarded as potential biological warfare agents. Accordingly, control, detection and neutralization of toxic substances are a considerable economic burden to food safety, health care and military biodefense. The present contribution describes a new versatile instrument and related procedures for array-based simultaneous detection of bacterial and plant toxins using a bioanalytical platform which combines the specificity of covalently immobilized capture probes with a dedicated instrumentation and immuno-based microarray analytics. The bioanalytical platform consists of a microstructured polymer slide serving both as support of printed arrays and as incubation chamber. The platform further includes an easy-to-operate instrument for simultaneous slide processing at selectable assay temperature. Cy5 coupled streptavidin is used as unifying fluorescent tracer. Fluorescence image analysis and signal quantitation allow determination of the toxin’s identity and concentration. The system’s performance has been investigated by immunological detection of Botulinum Neurotoxin type A (BoNT/A), Staphylococcal enterotoxin B (SEB), and the plant toxin ricin. Toxins were detectable at levels as low as 0.5–1 ng·mL−1 in buffer or in raw milk. View Full-Text
Keywords: biosensor; microfluidics; toxins; bioanalytics; platform biosensor; microfluidics; toxins; bioanalytics; platform

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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Weingart, O.G.; Gao, H.; Crevoisier, F.; Heitger, F.; Avondet, M.-A.; Sigrist, H. A Bioanalytical Platform for Simultaneous Detection and Quantification of Biological Toxins. Sensors 2012, 12, 2324-2339.

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