quantification of quercetin using glassy carbon electrodes modified with multiwalled carbon nanotubes dispersed in polyethylennimine and polyacrylic acid

FABIANA GUTIERREZ; GABRIELA ORTEGA; JOSÉ LUIS CABRERA; MARÍA D. RUBIANES; GUSTAVO A. RIVAS

WILEY-V C H VERLAG GMBH

Año: 2010 p. 2650 - 2650

font face="AdvTTB" size="1"> Abstract This work reports the highly sensitive detection of quercetin using glassy carbon electrodes modified with multiwall carbon nanotubes (MWCNT) dispersed in polyethylenimine and poly(acrylic acid). The adsorptive stripping with square wave voltammetric transduction allowed the detection of 7.5 nM quercetin after 1.0 min accumulation at open circuit potential. The amperometric detection at 0.150 V is reported as an easier and simpler alternative to determine quercetin, with detection limits of 0.2 mM. The careful selection of the working conditions also made possible the detection of s