催化学报

催化学报 ›› 2012, Vol. 33 ›› Issue (11): 1783-1790.DOI: 10.1016/S1872-2067(11)60438-5

• 研究论文 • 上一篇    下一篇

A Carbon Nanotube Modified Electrode for Determination of Caffeine by Differential Pulse Voltammetry

Biuck HABIBI1,*, Mehri ABAZARI1, Mohammad Hossien POURNAGHI-AZAR2   

  1. 1Electroanalytical Chemistry Laboratory, Department of Chemistry, Faculty of Sciences, Azarbaijan University of Tarbiat Moallem, Tabriz 53714-161, Iran; 2Center of Excellence of New Materials and Clean Chemistry, University of Tabriz, Tabriz 5166616471, Iran
  • 收稿日期:2012-06-22 修回日期:2012-07-26 出版日期:2012-11-16 发布日期:2012-11-16

A Carbon Nanotube Modified Electrode for Determination of Caffeine by Differential Pulse Voltammetry

Biuck HABIBI1,*, Mehri ABAZARI1, Mohammad Hossien POURNAGHI-AZAR2   

  1. 1Electroanalytical Chemistry Laboratory, Department of Chemistry, Faculty of Sciences, Azarbaijan University of Tarbiat Moallem, Tabriz 53714-161, Iran; 2Center of Excellence of New Materials and Clean Chemistry, University of Tabriz, Tabriz 5166616471, Iran
  • Received:2012-06-22 Revised:2012-07-26 Online:2012-11-16 Published:2012-11-16

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摘要： A simple and sensitive electrochemical detection of caffeine (CAF) using a single-walled carbon nanotubes on carbon-ceramic electrode (SWCNT/CCE) is reported. CAF was oxidized at the surface of the modified electrode to produce an anodic peak at 1.38 V versus the saturated calomel electrode in 0.01 mol/L, pH 1.7 H2SO4 solution in cyclic voltammetry. The experimental parameters, namely, type of electrolyte, pH value, and amount of SWCNTs casted, were optimized. Using the optimum conditions, the anodic peak current in differential pulse voltammetry was linear with CAF concentration in the range of 2.5 × 10-7-1.0 × 10-4 mol/L. The detection limit was 1.2 × 10-7 mol/L (S/N = 3). The modified electrode exhibited good stability and can be easily regenerated. The relative standard deviation of the peak current obtained for a 5.0 × 10-5 mol/L CAF solution was 3.0%. The influence of some important biological compounds, namely, ascorbic acid, dopamine, and uric acid and addictive compounds like codeine, morphine, and acetaminophen on the CAF anodic peak current was examined. The method was successfully applied for the determination of CAF in some practical samples.

关键词: caffeine, electrocatalysis, electrochemical determination, single-walled carbon nanotube, carbon-ceramic electrode

Abstract: A simple and sensitive electrochemical detection of caffeine (CAF) using a single-walled carbon nanotubes on carbon-ceramic electrode (SWCNT/CCE) is reported. CAF was oxidized at the surface of the modified electrode to produce an anodic peak at 1.38 V versus the saturated calomel electrode in 0.01 mol/L, pH 1.7 H2SO4 solution in cyclic voltammetry. The experimental parameters, namely, type of electrolyte, pH value, and amount of SWCNTs casted, were optimized. Using the optimum conditions, the anodic peak current in differential pulse voltammetry was linear with CAF concentration in the range of 2.5 × 10-7-1.0 × 10-4 mol/L. The detection limit was 1.2 × 10-7 mol/L (S/N = 3). The modified electrode exhibited good stability and can be easily regenerated. The relative standard deviation of the peak current obtained for a 5.0 × 10-5 mol/L CAF solution was 3.0%. The influence of some important biological compounds, namely, ascorbic acid, dopamine, and uric acid and addictive compounds like codeine, morphine, and acetaminophen on the CAF anodic peak current was examined. The method was successfully applied for the determination of CAF in some practical samples.

Key words: caffeine, electrocatalysis, electrochemical determination, single-walled carbon nanotube, carbon-ceramic electrode