Versatile transduction scheme based on electrolyte-gated organic field-effect transistor used as immunoassay readout system

Publication date: 15 June 2017
Source:Biosensors and Bioelectronics, Volume 92
Author(s): Benoît Piro, Dengjun Wang, Dihia Benaoudia, Alexandra Tibaldi, Guillaume Anquetin, Vincent Noël, Steeve Reisberg, Giorgio Mattana, Brianna Jackson
We report on an innovative heterogeneous bisphenol A (BPA) immunoassay based on an electrolyte-gated organic field-effect transistor whose organic semiconductor is poly(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene) co-crystallized with an alkyl derivative of bisphenol A. A decrease of the transistor output current is first observed upon antibody specific binding onto the organic semiconductor. Upon bisphenol A addition, the competitive dissociation of the antibody from the semiconductor surface leads to an opposite increase of the output current. We present here a proof-of-concept for bisphenol A detection; the device could be readily adapted to other small organic molecules of interest and is a promising tool for simple, low-cost, portable and easy-to-use biosensors.

Graphical abstract

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