Multi-wall carbon nanotubes (MWCNTs)-doped polypyrrole DNA biosensor for label-free detection of genetically modified organisms by QCM and EIS

T. T N Lien, Tran Dai Lam, V. T H An, Tran Vinh Hoang, Duong Tuan Quang, Dinh Quang Khieu, Toshifumi Tsukahara, Young Hoon Lee, Jong Seung Kim

    Research output: Contribution to journalArticlepeer-review

    80 Citations (Scopus)

    Abstract

    In this paper, we describe DNA electrochemical detection for genetically modified organism (GMO) based on multi-wall carbon nanotubes (MWCNTs)-doped polypyrrole (PPy). DNA hybridization is studied by quartz crystal microbalance (QCM) and electrochemical impedance spectroscopy (EIS). An increase in DNA complementary target concentration results in a decrease in the faradic charge transfer resistance (Rct) and signifying "signal-on" behavior of MWCNTs-PPy-DNA system. QCM and EIS data indicated that the electroanalytical MWCNTs-PPy films were highly sensitive (as low as 4 pM of target can be detected with QCM technique). In principle, this system can be suitable not only for DNA but also for protein biosensor construction.

    Original languageEnglish
    Pages (from-to)1164-1169
    Number of pages6
    JournalTalanta
    Volume80
    Issue number3
    DOIs
    Publication statusPublished - 2010 Jan

    Bibliographical note

    Funding Information:
    T.T.N. Lien wishes to thank the receipt of a grant from the Flemish Interuniversity Council for University Development cooperation (VLIR UOS), V.T.H. An would like to acknowledge HUT university grant T2008-01 . J.S. Kim is grateful for grant of Creative Research Initiative program supported by MEST.

    Keywords

    • Electrochemical DNA biosensor
    • Electrochemical impedance spectroscopy
    • MWCNTs-doped polypyrrole
    • Quartz crystal microbalance

    ASJC Scopus subject areas

    • Analytical Chemistry

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