Electrical detection of dna hybridization and specific...

C - Chemistry – Metallurgy – 12 – Q

Patent

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C12Q 1/68 (2006.01) C12M 1/00 (2006.01) G01N 31/22 (2006.01) G01R 15/12 (2006.01)

Patent

CA 2484948

A method for detecting a target analyte having a first binding site and a second binding site. A substrate is provided having at least a first and a second patterned conductor, the first conductor being separated from the second conductor. The arrangement of the patterned conductors forms at least two substantially non-conducting gaps. The method may also include contacting to the substrate capture probes that bind specifically to the first binding site of the target analyte and providing electrically conductive nanoparticles having bound thereto binding sites that bind specifically to the second binding site of the target analyte. Then, contacting the substrate and the to electrically conductive nanoparticles with the target analyte under hybridizing conditions will bind the target analyte to the substrate and to the electrically conductive nanoparticles. The electrically conductive nanoparticles between the conductors can thus be electrically detected. Detection can be improved by silver deposition of the nanoparticles.

L'invention concerne un procédé de détection d'un analyte cible comportant un premier site de liaison et un second site de liaison. On met en place un substrat contenant au moins un premier et un second sites de conducteur structuré, le premier et second conducteur étant séparés. L'agencement des conducteurs forme au moins deux espaces non conducteurs. Le procédé peut aussi consister à mettre en contact les sondes de capture du substrat qui se lient spécifiquement au premier site de liaison de l'analyte cible et à mettre en place des nanoparticules conductrices comportant des sites de liaison qui se lient spécifiquement au second site de liaison de l'analyte cible. Alors, la mise en contact du substrat et des nanoparticules électriquement conductrices avec l'analyte cible dans des conditions d'hybridation lie l'analyte cible au substrat et aux nanoparticules électriquement conductrices. Ces nanoparticules disposées entre les conducteurs peuvent lors être détectées électriquement. La détection peut être améliorée par dépôt d'argent sur les nanoparticules.

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