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  • Title: Label-free and reagentless electrochemical detection of microRNAs using a conducting polymer nanostructured by carbon nanotubes: application to prostate cancer biomarker miR-141.
    Author: Tran HV, Piro B, Reisberg S, Tran LD, Duc HT, Pham MC.
    Journal: Biosens Bioelectron; 2013 Nov 15; 49():164-9. PubMed ID: 23743328.
    Abstract:
    In this paper, a label-free and reagentless microRNA sensor based on an interpenetrated network of carbon nanotubes and electroactive polymer is described. The nanostructured polymer film presents very well-defined electroactivity in neutral aqueous medium in the cathodic potential domain from the quinone group embedded in the polymer backbone. Addition of microRNA miR-141 target (prostate cancer biomarker) gives a "signal-on" response, i.e. a current increase due to enhancement of the polymer electroactivity. On the contrary, non-complementary miRNAs such as miR-103 and miR-29b-1 do not lead to any significant current change. A very low detection limit of ca. 8 fM is achieved with this sensor.
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