Abstract
We report on the determination of choline and acetylcholine via biocentrivoltammetry. This method combines centrifugation and voltammetry and is based on a carbon paste electrode modified with acetylcholinesterase and choline oxidase. The electrode was placed at the bottom of a biocentrivoltammetric cell. Acetylcholine and choline are accumulated on the enzyme electrode via centrifugative forces, upon which a direct voltammetric scan is applied. Reaction time, pH values, quantities of enzyme and centrifugation parameters were optimized. A linear response is obtained in the 0.07 to 10 μM concentration range of acetylcholine, and a limit of detection as low as 0.5 μM. The linear range is between 0.1 and 500 μM for choline. The method was applied to the determination of acetylcholine and choline in spiked serum samples.
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The grant from The Technical and Scientific Council of Turkey (TUBİTAK) Project no: 109T885 and Mugla Sıtkı Kocman University BAP project no 12/08 are gratefully acknowledged.
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Çevik, S., Timur, S. & Anik, Ü. Biocentri-voltammetric biosensor for acetylcholine and choline. Microchim Acta 179, 299–305 (2012). https://doi.org/10.1007/s00604-012-0895-1
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DOI: https://doi.org/10.1007/s00604-012-0895-1