催化学报 ›› 2013, Vol. 34 ›› Issue (6): 1098-1104.DOI: 10.1016/S1872-2067(12)60544-0

• 研究论文 • 上一篇    下一篇

Voltammetric determination of ascorbic acid in the presence of acetaminophen and tryptophan using an improved carbon nanotube paste electrode

Hadi BEITOLLAHIa, Somayeh MOHAMMADIb   

  1. a Environment Department, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran;
    b Department of Chemistry, Payame Noor University, 19395-4697, Tehran, Iran
  • 收稿日期:2012-11-04 修回日期:2013-01-31 出版日期:2013-06-07 发布日期:2013-06-09
  • 通讯作者: Hadi BEITOLLAHI

Voltammetric determination of ascorbic acid in the presence of acetaminophen and tryptophan using an improved carbon nanotube paste electrode

Hadi BEITOLLAHIa, Somayeh MOHAMMADIb   

  1. a Environment Department, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran;
    b Department of Chemistry, Payame Noor University, 19395-4697, Tehran, Iran
  • Received:2012-11-04 Revised:2013-01-31 Online:2013-06-07 Published:2013-06-09

摘要:

A carbon paste electrode (CPE) modified with carbon nanotubes and 5-amino-3',4'-dimethyl- biphenyl-2-ol (5ADB) is prepared. Under the optimum pH of 7.0, the oxidation of ascorbic acid (AA) on the modified CPE occurs at a potential about 280 mV less positive than that on the unmodified CPE. Some kinetic and thermodynamic parameters for electrocatalytic oxidation of AA, including electron transfer coefficient (α = 0.58) and diffusion coefficient (D=2.2×10-6 cm2/s), are also determined. AA, acetaminophen (AC), and tryptophan (TRP) were detected simultaneously using the modified CPE. The peak potentials recorded using the modified CPE in phosphate-buffered solution at pH 7.0 were 265, 465, and 780 mV for AA, AC, and TRP, respectively. The modified CPE was successfully used to determine the concentrations of AA, AC, and TRP in real samples.

关键词: Ascorbic acid, Acetaminophen, Tryptophan, Carbon nanotube paste electrode, Electrocatalysis

Abstract:

A carbon paste electrode (CPE) modified with carbon nanotubes and 5-amino-3',4'-dimethyl- biphenyl-2-ol (5ADB) is prepared. Under the optimum pH of 7.0, the oxidation of ascorbic acid (AA) on the modified CPE occurs at a potential about 280 mV less positive than that on the unmodified CPE. Some kinetic and thermodynamic parameters for electrocatalytic oxidation of AA, including electron transfer coefficient (α = 0.58) and diffusion coefficient (D=2.2×10-6 cm2/s), are also determined. AA, acetaminophen (AC), and tryptophan (TRP) were detected simultaneously using the modified CPE. The peak potentials recorded using the modified CPE in phosphate-buffered solution at pH 7.0 were 265, 465, and 780 mV for AA, AC, and TRP, respectively. The modified CPE was successfully used to determine the concentrations of AA, AC, and TRP in real samples.

Key words: Ascorbic acid, Acetaminophen, Tryptophan, Carbon nanotube paste electrode, Electrocatalysis