Publication details

Electrochemical determination of adenine using a glassy carbon electrode modified with graphene oxide and polyaniline

Authors

SHARMA Vimal Kumar HYNEK David TRNKOVÁ Libuše HEMZAL Dušan MÁRIK Marian KIZEK René HUBÁLEK Jaromír

Year of publication 2016
Type Article in Periodical
Magazine / Source Microchimica Acta
MU Faculty or unit

Faculty of Science

Citation
Web http://dx.doi.org/10.1007/s00604-015-1740-0
Doi http://dx.doi.org/10.1007/s00604-015-1740-0
Field Physical chemistry and theoretical chemistry
Keywords nanocomposite; sensor; cyclic voltammetry; differential pulse voltammetry; scanning electron microscopy; Raman spectroscopy
Description The electrochemical behavior of adenine at a glassy carbon electrode (GCE) modified with a nanocomposite consisting of graphene oxide and polyaniline was investigated by cyclic voltammetry and differential pulse voltammetry. The nanocomposite was synthesized by polymerization and characterized by Raman and UV-vis spectroscopy, and its morphology was examined by scanning electron microscopy. Adenine is oxidized at the modified GCE at a working potential of 1.2 V (vs. Ag/AgCl) and gives a current density of approximately 2.64 nA.cm(-2), which is distinctly increased compared to the 0.57 nA.cm(-2) of a bare electrode. Peak current and adenine concentration are linearly related to each other in the range from 0.5 mu M to 20 mu M. The modified GCE exhibits acceptable analytical performance, with a detection limit of 72 nM and a limit of quantification of 240 nM. It is excellently reproducible, stable, and fabrication is simple.
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