Citation: WANG Rui, BAI Yan, LIANG Zhi-Hong, LIU Ying, HUANG Li-Li, ZHENG Wen-Jie. Interaction between Selenomethionine and Copper Ions[J]. Acta Physico-Chimica Sinica, ;2010, 26(12): 3225-3229. doi: 10.3866/PKU.WHXB20101213 shu

Interaction between Selenomethionine and Copper Ions

1.
1. Department of Chemistry, Jinan University, Guangzhou 510632, P. R. China;
2. Experiment and Technology Center, Jinan University, Guangzhou 510632, P. R. China

Received Date: 2 July 2010
Available Online: 2 November 2010
Fund Project: 国家自然科学基金(20771044) (20771044)广东省自然科学基金(8251063201000008)资助项目 (8251063201000008)

The binary Cu-selenomethionine (SeMet) complex was investigated using voltammetry and chronocoulometry. A pair of peaks (V, VI) were observed at -132 and 71 mV in the Cu(NO₃)₂ solution. When SeMet and Cu(NO₃)₂ coexisted, four peaks (I, II, III, and IV) were observed at 14, 128, 271, and -194 mV, respectively. From the 600 to -600 mV potential scan, we observed that the Cu(II)-(SeMet)₂ complex was reduced to Cu(I)-SeMet complex at 14 mV and then the Cu(I)-SeMet complex was reduced to Cu(0) and SeMet at -194 mV. After reaching -600 mV the potential was reversed and the reduced product was oxidized to the Cu(I)-SeMet complex at 128 mV and Cu(II)-(SeMet)₂ complex at 271 mV. The Cu(I)-SeMet complex was stable from about -100 to 200 mV and a redox process was observed for Cu(I). The stability constants of the binary Cu-SeMet complex, 2.24×10⁷ (K₁) and 2.24×10⁶ (K₂), were determined by capillary electrophoresis. We proposed the structures of Cu-SeMet complexes: Copper coordinated with SeMet by the formation of Cu—Se and Cu—OCO bonds at pH 3.9 or by the formation of Cu—N and Cu—OCO bonds under physiological conditions.
- Copper ion,
- Selenomethionine,
- Electrochemical characteristic,
- Coordination structure,
- Capillary electrophoresis
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