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Title

Quantitative detection of doping substances by a localised surface plasmon sensor

AuthorsKreuzer, Mark P.; Quidant, Romain; Badenes, Gonçal; Marco, María Pilar
KeywordsOptical sensing
Localised surface plasmons
Immunosensor
Stanozolol
Issue Date15-Jan-2006
PublisherElsevier
CitationBiosensors & Bioelectronics 21(7): 1345-1349 (2006)
AbstractWithin this communication, consistent evidence of a quantitative biosensing principle for steroidal residue analysis is presented. Our approach uses a simple method for the quantitative determination of an anabolic agent called stanozolol (Sz). Sz (Mw 328) is widely used in sports, horse racing and as a growth promoter in animals for human consumption. Through the use of localised surface plasmons (LSPs), sustained by three-dimensional noble metal nano-structures, we have developed a highly specific, label-less immunosensor for the detection of this small organic molecule to low levels (nM range). A main practical advantage over conventional flat extended film surface plasmon resonance (SPR) systems is the simplicity of the optical configuration, since there is no need for cumbersome total internal reflection illumination, thus making integration easier. In addition, the active area of the LSP-based sensor is smaller, decreasing the minimum detectable number of molecules involved in the binding event. Assay times are short and the set-up is comprised of relatively cheap instrumentation. Detection levels found here are comparable with SPR, even at this early stage of development and with further modifications, we envisage sensing down to pM (10−12) levels.
Description5 pages, 2 figures.
Publisher version (URL)http://dx.doi.org/10.1016/j.bios.2005.04.019
URIhttp://hdl.handle.net/10261/12346
DOI10.1016/j.bios.2005.04.019
ISSN0956-5663
Appears in Collections:(IQAC) Artículos
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