A Voltammetric Sensor for the Simultaneous Determination of L-Cysteine and Tryptophan Using a p-Aminophenol-Multiwall Carbon Nanotube Paste Electrode
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- ENSAFI Ali A.
- Department of Chemistry, Isfahan University of Technology
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- DADKHAH-TEHRANI Samira
- Department of Chemistry, Isfahan University of Technology
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- KARIMI-MALEH Hassan
- Department of Chemistry, Isfahan University of Technology
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Two amino acids, L-cysteine and tryptophan, could be simultaneously determined in an aqueous solution (pH 6.0) using a carbon nanotube paste electrode (CNPE) modified with p-aminophenol as a mediator. The results indicate that the electrode is efficient in terms of its electrocatalytic activity for the oxidation of L-cysteine, leading to an overpotential reduced by more than 550 mV. Using differential pulse voltammetry, we could measure L-cysteine and tryptophan in one mixture independently from each other by a potential difference of about 600 mV. Electrochemical techniques are used to determine the diffusion coefficients, kinetic parameters such as electron transfer coefficient, and the rates of electro-oxidation of L-cysteine at the surface of the p-aminophenol-modified CNPE. The peak current is found to depend linearly on L-cysteine and tryptophan concentrations within the ranges of 0.5 – 100 μmol L−1 L-cysteine and 10.0 – 300 μmol L−1 tryptophan. The detection limits for L-cysteine and tryptophan are found to be 0.3 and 5.7 μmol L−1, respectively. The proposed method is also used for the determination of L-cysteine and tryptophan in urine, river water, blood plasma, and serum samples using standard addition methods.
収録刊行物
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- Analytical Sciences
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Analytical Sciences 27 (4), 409-, 2011
社団法人 日本分析化学会
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詳細情報 詳細情報について
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- CRID
- 1390001204260835840
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- NII論文ID
- 130004442011
- 10028203563
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- NII書誌ID
- AA10500785
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- ISSN
- 13482246
- 09106340
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- NDL書誌ID
- 11042280
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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