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Identification of pathogenic microbial cells and spores by electrochemical detection on a biochip
KTH, Superseded Departments, Biotechnology.
KTH, Superseded Departments, Biotechnology.
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2004 (English)In: Microbial Cell Factories, ISSN 1475-2859, Vol. 3, 2- p.Article in journal (Refereed) Published
Abstract [en]

Background: Bacillus cereus constitutes a significant cause of acute food poisoning in humans. Despite the recent development of different detection methods, new effective control measures and better diagnostic tools are required for quick and reliable detection of pathogenic microorganisms. Thus, the objective of this study was to determine a simple method for rapid identification of enterotoxic Bacillus strains. Here, a special attention is given to an electrochemical biosensor since it meets the requirements of minimal size, lower costs and decreased power consumption. Results: A bead-based sandwich hybridization system was employed in conjugation with electric chips for detection of vegetative cells and spores of Bacillus strains based on their toxin-encoding genes. The system consists of a silicon chip based potentiometric cell, and utilizes paramagnetic beads as solid carriers of the DNA probes. The specific signals from 20 amol of bacterial cell or spore DNA were achieved in less than 4 h. The method was also successful when applied directly to unpurified spore and cell extract samples. The assay for the haemolytic enterotoxin genes resulted in reproducible signals from B. cereus and B. thuringiensis while haemolysin-negative B. subtilis strain did not yield any signal. Conclusions: The sensitivity, convenience and specificity of the system have shown its potential. In this respect an electrochemical detection on a chip enabling a fast characterization and monitoring of pathogens in food is of interest. This system can offer a contribution in the rapid identification of bacteria based on the presence of specific genes without preceding nucleic acid amplification.

Place, publisher, year, edition, pages
2004. Vol. 3, 2- p.
National Category
Biological Sciences
URN: urn:nbn:se:kth:diva-101974DOI: 10.1186/1475-2859-3-2ISI: 000208307500002ScopusID: 2-s2.0-2942589184OAI: diva2:550417

QC 20120907

Available from: 2012-09-07 Created: 2012-09-06 Last updated: 2012-09-07Bibliographically approved

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Gabig-Ciminska, MagdalenaAndresen, HeikoEnfors, Sven-Olof
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