Abstract
Some diuretic substances are controlled and monitored by the World Anti-Doping Agency as prohibited substances for use by athletes, such as triamterene (TRT). Thus, this work describes a voltammetric method based on graphite-epoxy composite electrode modified by tosyl-functionalized magnetic particles (GECE/MPs-To) for determination of TRT diuretic in urine sample. The TRT presented an oxidation peak at +1.24 V at GECE/MPs-To with irreversible behavior. Controlled potential electrolysis of the TRT at +1.26 V indicated the two electrons are transferred during amine group oxidation and the main product was identified by LC-MS/MS. The anodic peak current is 25 % higher at the modified electrode, suggesting that TRT is adsorbed on the magnetic particles. Using optimized conditions by using multivariate optimization of the parameters inherent of the square wave voltammetry, a calibration curve was constructed with a linear relationship for TRT from 0.500 to 99.8 μmol L−1. The limits of detection and quantification were 1.47 and 4.91 × 10−7 mol L−1, respectively. The proposed method was applied to urine sample and validated by LC-MS/MS technique where the values found and compared between the two techniques showed no significant difference at 95 % confidence.
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The authors gratefully acknowledge the financial support from Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), CAPES, and CNPq.
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Hudari, F.F., da Silva, B.F., Pividori, M.I. et al. Voltammetric sensor based on magnetic particles modified composite electrode for determination of triamterene in biological sample. J Solid State Electrochem 20, 2491–2501 (2016). https://doi.org/10.1007/s10008-015-3078-2
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DOI: https://doi.org/10.1007/s10008-015-3078-2