Premium
Quantification of Quercetin Using Glassy Carbon Electrodes Modified with Multiwalled Carbon Nanotubes Dispersed in Polyethylenimine and Polyacrylic Acid
Author(s) -
Gutiérrez Fabiana,
Ortega Gabriela,
Cabrera José Luis,
Rubianes María D.,
Rivas Gustavo A.
Publication year - 2010
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201000291
Subject(s) - polyethylenimine , quercetin , amperometry , rutin , polyacrylic acid , carbon nanotube , materials science , electrode , glassy carbon , carbon fibers , detection limit , stripping (fiber) , chromatography , chemistry , nanotechnology , cyclic voltammetry , electrochemistry , organic chemistry , polymer , composite number , biochemistry , composite material , antioxidant , transfection , gene
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 µM. 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 quercetin in onion samples.