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Sensitive determination of ATP using a carbon paste electrode modified with a carboxyl functionalized ionic liquid |
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| Authors: | Hongwei Gao Mengying Xi Li Xu Wei Sun |
| Institution: | 1. Shandong Entry-Exit Inspection and Quarantine Bureau of People??s Republic of China, Qingdao, 266002, People??s Republic of China 2. College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, People??s Republic China |
| Abstract: | We report on a new electrode for the determination of adenosine-5??-triphosphate (ATP). It is based on modified carbon paste electrode that contains an ionic liquid (IL) as the binder. The electrode shows strong electrocatalytic oxidative activity towards ATP at pH 4.5 in giving a well-defined single oxidation peak. The oxidation reaction is adsorption-controlled and due to the presence of the highly conductive IL. The electron transfer rate constant was calculated to be 2.04×10?C3 s?C1, and the surface coverage is 1.11×10?C10 mol cm?C2. Under the selected conditions, the oxidation peak current changes linearly with the concentration of ATP in the range from 5.0 to 1000???mol L?1 and a detection limit of 1.67???mol L?1 (3???) as determined by differential pulse voltammetry. The method displays good selectivity and was applied to the determination of ATP injection samples with satisfactory results. An ionic liquid 1-carboxyl-methyl-3-methylimidazolium hexafluorophosphate modified carbon paste electrode was fabricated and used for the sensitive detection adenosine-5??-triphosphate (ATP). The electrochemical oxidation of ATP was greatly enhanced due to the presence of IL in the carbon paste and the electrochemical parameter was calculated. |
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