Abstract
Poly(aminoquinone) (PAQ) was synthesized through iodate-oxidation/Michael addition reaction of 1,2-dihydroxybenzene with 4,4′-methylenedianiline and characterized with SEM, FT-IR and UV-Vis techniques. The PAQ-multiwalled carbon nanotubes (MWCNTs) hybrid film modified glassy carbon (GC) electrode showed well-defined redox peaks of the quinone groups of the polymer, which effectively mediated the oxidation of l-cysteine (CySH) in a pH 7.0 phosphate buffer, with an overpotential decrease by ca. 0.26 V (versus bare GC). The PAQ-MWCNTs-Nafion/GC electrode was used for sensitive biosensing to CySH, with a limit of detection of 75 nmol L−1.
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