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Evaluation Studies
Journal Article
Research Support, Non-U.S. Gov't
Immobilisation of DNA probes for the development of SPR-based sensing.
Biosensors & Bioelectronics 2004 November 16
An immobilisation procedure based on the direct coupling of thiol-derivatised oligonucleotide probes to bare gold sensor surfaces has been used for DNA sensing applications. The instrumentation used relies on surface plasmon resonance (SPR) transduction; in particular the commercially available instruments BIACORE X and SPREETA, have been employed in this study. The performances of the SPR-based DNA sensors resulting from direct coupling of thiol-derivatised DNA probes onto gold chips, have been studied in terms of the main analytical parameters, i.e. selectivity, sensitivity, reproducibility, analysis time, etc. A comparison between the thiol-derivatised immobilisation approach and a reference immobilisation method, based on the coupling of biotinylated oligonucleotide probes onto a streptavidin coated dextran sensor surface, using synthetic complementary oligonucleotides has been discussed. Finally, a denaturation method to obtain ssDNA ready for hybridisation analysis has been applied to polymerase chain reaction (PCR) amplified samples, for the detection of genetically modified organisms (GMOs).
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