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Citation: YAO Jun, LI Jiang-Yuan, LIU Min. Electrochemical Behavior and Determination of Vitamin B₆ at Poly-L-tryptophan Modified Electrode[J]. Chinese Journal of Applied Chemistry, ;2009, 26(7): 826-830. shu

Electrochemical Behavior and Determination of Vitamin B₆ at Poly-L-tryptophan Modified Electrode

1.
College of Chemistry and Chemical Engineering, China West Normal University, Laboratory of Applied Chemistry and Pollution Control Technology, Nanchong 637002

Corresponding author: LI Jiang-Yuan,
Received Date: 24 June 2008
Available Online: 28 October 2008
Fund Project: 四川省教育厅重点科研资助项目(07ZA170) (07ZA170)

Electrochemical behavior and kinetic parameters of vitamin B₆(VB₆) were investigated at poly-L-tryptophan modified glassy carbon electrode(PTRP/GCE) by cyclic voltammetry(CV),linear sweep voltammetry(LSV) and chronocoulometry(CC).Electrochemical results show that VB₆ electrochemical behavior exhibits an irreversible oxidation at 1.085 V(vs.SCE) with one electron transfer and one proton.The peak currents are linearly related to the square root of scan rates in a scan rate range of 20～400 mV/s.The effective area of PTRP/GCE A_eff and the diffusion coefficient D are 0.29 cm² and 1.961 2×10^-4 cm²/s,respectively.In a HAc-NaAc buffer solution of pH=3.0,the oxidation peak current of VB6 versus its conce-ntration exhibits a good linear relationship in a concentration range of 1×10^-4～5×10^-6 mol/L with a correlation coefficient of 0.993 1 and a detection limit of 1×10^-6 mol/L.The linear regression equation is i_pa(μA) =7.740+408.813c(mmol/L) and the recovery is 100.15%.
- Vitamin B₆,
- L-tryptophan,
- modified electrode,
- electrochemistry,
- kinetics
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Electrochemical Behavior and Determination of Vitamin B6 at Poly-L-tryptophan Modified Electrode

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Electrochemical Behavior and Determination of Vitamin B₆ at Poly-L-tryptophan Modified Electrode