Femtomolar detection of a cancer biomarker protein in serum with ultralow background current by anodic stripping voltammetry

摘要

An electrochemical immunosensor for the detection of a cancer biomarker protein in serum at femtomolar concentrations with ultralow background response has been developed, which consists of (ⅰ) a hydrophilic polyacrylic acid brush-modified indium tin oxide substrate as an antifouling substrate and (ⅱ) a graphene-quantum dots-antibody 'bionanoconjugate' as a signal amplification label in voltammetric detection of targets in a glassy carbon electrode.