Linked Life Data

20810269

Source:http://linkedlifedata.com/resource/pubmed/id/20810269

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pubmed-article:20810269pubmed:abstractTextThe present work deals with the development of a Love-wave bacteria-based sensor platform for the detection of heavy metals in liquid medium. The acoustic delay-line is inserted in an oscillation loop in order to record the resonance frequency in real-time. A Polydimethylsiloxane (PDMS) chip with a liquid chamber is maintained by pressure above the acoustic wave propagation path. Bacteria (Escherichia coli) were fixed as bioreceptors onto the sensitive surface of the sensor coated with a polyelectrolyte (PE) multilayer using a simple and efficient layer-by-layer (LbL) electrostatic self-assembly procedure. Poly(allylamine hydrochloride) (PAH cation) and poly(styrene sulfonate) (PSS anion) were alternatively deposited so that the strong attraction between oppositely charged polyelectrolytes resulted in the formation of a (PAH-PSS)(n)-PAH molecular multilayer. The real-time characterization of PE multilayer and bacteria deposition is based on the measurement of the resonance frequency perturbation due to mass loading during material deposition. Real-time response to various concentrations of cadmium (Cd(2+)) and mercury (Hg(2+)) has been investigated. A detection limit as low as 10(-12) mol/l has been achieved, above which the frequency increases gradually up to 10(-3) mol/l, after a delay of 60 s subsequent to their introduction onto bacterial cell-based biosensors. Beyond a 10(-3) mol/l a steep drop in frequency was observed. This response has been attributed to changes in viscoelastic properties, related to modifications in bacteria metabolism.lld:pubmed
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pubmed-article:20810269pubmed:copyrightInfoCopyright © 2010 Elsevier B.V. All rights reserved.lld:pubmed
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pubmed-article:20810269pubmed:year2010lld:pubmed
pubmed-article:20810269pubmed:articleTitleLove-wave bacteria-based sensor for the detection of heavy metal toxicity in liquid medium.lld:pubmed
pubmed-article:20810269pubmed:affiliationUniversité de Bordeaux, IMS, IPB-ENSEIRB, CNRS UMR 5218, Talence 33405, France.lld:pubmed
pubmed-article:20810269pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:20810269pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
pubmed-article:20810269pubmed:publicationTypeEvaluation Studieslld:pubmed