Electrochemistry of 2,6-diaminopurine on multiwall carbon nanotube modi?fied glassy carbon electrode
Küçük Resim Yok
Tarih
2013
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
The electrochemical oxidation of 2,6-diaminopurine (2,6-DAP) was studied in pH 7.4 phosphate bu?er solution on multiwall carbon nanotube modi?ed glassy carbon electrode (MWCNT/GCE) over a temperature range of 20 to 50 $^oC$ using cyclic voltammetry. 2,6-DAP oxidation on MWCNT/GCE showed a well-de?ned 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 $\underline{+}$? 1.88 kJ/mol. the di?erential 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 ?mol/L to 80 ?mol/L. the linear regression equation appeared as I p / $\mu$ ?A = -(1.66 $\underline{+}$? 0.42) + (4.21 $\underline{+}$? 0.11) [2,6-DAP]/$\mu$ ?mol/L, $R^2$ = 0.9982, and the detection limit (S/N = 3) was 3 ? $10^{-7}$ $\underline{+}$? 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.
Açıklama
Anahtar Kelimeler
Mühendislik, Kimya
Kaynak
Turkish Journal of Chemistry
WoS Q Değeri
Scopus Q Değeri
Cilt
37
Sayı
3
