Voltammetric and flow injection amperometric determination of cysteine at a glassy carbon electrode in the presence of Copper(II) ions
Makaleler > Tam Makale · 2003
Yazarlar: Zekerya DURSUN, Z Dursun, I Sahbaz, FN Ertas, G Nisli
TURKISH JOURNAL OF CHEMISTRY, SCI Expanded İndekslerine Giren Dergi, Uluslararası, 2003, cilt 27, ss 513-519
Özet
The voltammetric behaviour of cysteine was investigated in the presence of Cu(II) ions at a rotating glassy carbon electrode (RGCE). Two reduction peaks related to the successive reduction of the cysteine complexes of Cu(II) and Cu(I) ions were observed at -0.30 and -0.60 V vs. SCE respectively. These peaks were increased upon the addition of cysteine into a pH 9.20 borate buffer solution containing 0.1 M KNO3 and 1.0 x 10(-5) M Cu(II) ions. The calibration curve was linear in the concentration range of 5.0 x 10(-10) - 2.0 x 10(-8) M for cysteine by utilising the peak current at -0.6 V vs. SCE.