Voltammetric and flow injection amperometric determination of cysteine at a glassy carbon electrode in the presence of Copper(II) ions

Dursun Z., Sahbaz I., Ertas F., Nisli G.

TURKISH JOURNAL OF CHEMISTRY, vol.27, no.4, pp.513-519, 2003 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 27 Issue: 4
  • Publication Date: 2003
  • Page Numbers: pp.513-519


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.