Quantification of Quercerin Using Glassy Carbon Electrodes Modified with Multiwalled Carbon Nanotubes Dispersed in Polyethyleneimine and Polyacrylic Acid.

FABIANA GUTIÉRREZ, JOSÉ LUIS CABRERA, GABRIELA ORTEGA, MARÍA D. RUBIANES, GUSTAVO A. RIVAS.

ELECTROANALYSIS

WILEY-V C H VERLAG GMBH

Año: 2010 vol. 22 p. 2650 - 2657

1040-0397

This work reports the highly sensitive detection of quercetin using glassy carbon electrodes modified with multi-wall carbon nanotubes (MWCNT) dispersed in polyethylenimine and poly(acrylic acid). The adsorptive stripping with square wave voltammetric transduction allowed the detection of 7.5nM quercetin after 1.0min accumulation at open circuit potential. The amperometric detection at 0.150V is reported as an easier and simpler alternative to determine quercetin, with detection limits of 0.2ìM. The careful selection of the working conditions also made possible the detection of submicromolar levels of quercetin in the presence of excess of rutin. The proposed methodology was successfully used to quantify querecetin in onion samples.