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Citation: XIANG Wei, LI Jiang-Yuan, MA Zeng-Yan. Electrochemical Behavior and Determination of Vitamin B₁₂ at Multi-Wall Carbon Nanotubes Modified Glassy Carbon Electrode[J]. Chinese Journal of Applied Chemistry, ;2007, 24(8): 921-924. shu

Electrochemical Behavior and Determination of Vitamin B₁₂ at Multi-Wall Carbon Nanotubes Modified Glassy Carbon Electrode

1.
Institute of Chemical Engineering, China West Normal University, Nanchong 637002

Corresponding author: LI Jiang-Yuan,
Received Date: 11 August 2006
Available Online: 20 February 2007
Fund Project: 四川省教育厅重点科研项目(2004A106) (2004A106)

Multi-wall carbon nanotubes modified glassy carbon electrode (MWNT/GCE) was prepared,and the electrocatalysis of vitamin B₁₂(VB₁₂) and analytic conditions of VB₁₂ on the electrode were studied.The results indicate that two pairs of redox peaks of VB₁₂ at MWCNT/GCE are obtained by cyclic voltammetry in the mixture of 0.1 mol/L KCl as supporting electrolyte and phosphatic buffer solution (pH=7.0).The formal potentials are -0.10 V and -0.85 V (vs.SCE),respectively.The 1st order derivative of the current of reduction peak at -0.85 V is linearly related to the concentration of VB₁₂ in the range of 1×10^-8~4×10^-7 mol/L,which obeys the equation i'_p=5.958×10^-7+2.885c(R=0.995) and the detection limit can reach to 1.5×10^-9 mol/L.This electrode has been applied to directly determining VB₁₂ in tablets with a recovery of 97.3%~107.8%.
- Vitamin B₁₂,
- multi-wall carbon nanotubes,
- cyclic voltammetry,
- modified electrode
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Electrochemical Behavior and Determination of Vitamin B₁₂ at Multi-Wall Carbon Nanotubes Modified Glassy Carbon Electrode