Electrochemistry of 2,6-diaminopurine on multiwall carbon nanotube modified glassy carbon electrode
Makaleler > Tam Makale · 2013
Yazarlar: Ebru Mavioglu Ayan, Şükriye KARABİBEROĞLU, Zekerya DURSUN
Turkish Journal of Chemistry, SCI Expanded İndekslerine Giren Dergi, Uluslararası, 2013, cilt 37, ss 325-334
DOI: 10.3906/kim-1111-4
Özet
The electrochemical oxidation of 2,6-diaminopurine (2,6-DAP) was studied in pH 7.4 phosphate buffer solution on multiwall carbon nanotube modified glassy carbon electrode (MWCNT/GCE) over a temperature range of 20 to 50 °C using cyclic voltammetry. 2,6-DAP oxidation on MWCNT/GCE showed a well-defined and irreversible oxidation peak at about 0.72 V vs. Ag/AgCl at pH 7.4. The oxidation potential of 2,6-DAP linearly varied with pH over the range of 3.0 to 10.0 with a slope of -0.0547 V/pH, implying that 2 protons were accompanied by 2 electrons transferred in the electrochemical reaction. The activation energy, Ea, of oxidation reaction was found to be 33.10 ± 1.88 kJ/mol. The differential pulse voltammetric determination of 2,6-DAP was also studied. The peak currents increased linearly with increasing of the 2,6-DAP concentration range from 0.4 μmol/L to 80 μmol/L. The linear regression equation appeared as I p /μA = -(1.66 ± 0.42) + (4.21 ± 0.11) [2,6-DAP]/μmol/L, R2 = 0.9982, and the detection limit (S/N = 3) was 3 × 10-7 ± 0.015 mol/L (n =3). The electrocatalytic oxidation of 2,6-DAP on MWCNT/GCE showed that acid pretreated multiwall carbon nanotube can be used in new applications in electrochemical determinations of biologically important compounds. © TÜBITAK.