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Issue 20, 2013
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On-chip microbial culture for the specific detection of very low levels of bacteria

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Abstract

Microbial culture continues to be the most common protocol for bacterial detection and identification in medicine and agronomics. Using this process may take days to identify a specific pathogen for most bacterial strains. Surface Plasmon Resonance (SPR) detection is an emerging alternative technology that can be used for the detection of bacteria using protein microarrays although typical limits of detection are in the range of 103–106 cfu mL−1, which is not compatible with most Food Safety regulation requirements. In this work, we combine concomitant “on-chip” microbial culture with sensitive SPR detection of bacteria thus allowing rapid specific detection of bacteria pathogens – including Salmonella enterica serovar Enteritidis, Streptococcus pneumoniae and Escherichia coli O157:H7 – cultured on a protein microarray. This Culture–Capture–Measure (CCM) approach significantly decreases both the number of processing steps and the overall assay time for bacterial detection. Signal analysis of SPR responses allowed the fast and quantitative assessment of bacterial concentrations initially present in the sample as low as 2.8 ± 19.6 cfu per milliliter. Altogether, our results show how simple, easy-to-operate, fluidic-less and lo-tec microarrays can be used with unprocessed samples and yield – in a single assay – both qualitative and quantitative information regarding bacterial contamination.

Graphical abstract: On-chip microbial culture for the specific detection of very low levels of bacteria

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Publication details

The article was received on 16 Apr 2013, accepted on 09 Jul 2013 and first published on 09 Jul 2013


Article type: Paper
DOI: 10.1039/C3LC50473E
Lab Chip, 2013,13, 4024-4032

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    On-chip microbial culture for the specific detection of very low levels of bacteria

    S. Bouguelia, Y. Roupioz, S. Slimani, L. Mondani, M. G. Casabona, C. Durmort, T. Vernet, R. Calemczuk and T. Livache, Lab Chip, 2013, 13, 4024
    DOI: 10.1039/C3LC50473E

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