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- W2114156936 abstract "Abstract In this work, the characterisation and the optimisation of hybridisation assays based on a novel, rapid and sensitive micro‐analytical, gravity‐driven, flow device is reported. This device combines a special chip containing eight polymer microchannels, with a portable, computer‐controlled instrument. The device is used as a platform for affinity experiments using oligonucleotide‐modified paramagnetic particles. In our approach, both hybridisation and labelling events are performed on streptavidin‐coated paramagnetic microparticles functionalised with a biotinylated capture probe. Modified particles, introduced in the microchannel inlet of the chip, accumulate near the electrode surface by virtue of a magnetic holder. After hybridisation with the complementary sequence, the hybrid is labelled with an alkaline phosphatase conjugate. The electrochemical substrate for alkaline phosphatase revelation is p ‐aminophenyl phosphate. Solutions and reagents are sequentially passed through the microchannels, until enzyme substrate is added for in situ signal detection. Upon readout, the magnet array is flipped away, beads are removed by addition of regeneration buffer, and the so‐regenerated chip is ready for further analysis. This protocol has been applied to the analytical detection of specific DNA sequences of Legionella pneumophila , with an RSD=8.5% and a detection limit of 0.33 nM." @default.
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- W2114156936 date "2010-10-21" @default.
- W2114156936 modified "2023-10-12" @default.
- W2114156936 title "A new gravity-driven microfluidic-based electrochemical assay coupled to magnetic beads for nucleic acid detection" @default.
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- W2114156936 doi "https://doi.org/10.1002/elps.201000288" @default.
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