Electrochemical Determination of Amlodipine in Pharmaceutical Formulations and in Human Urine Using a Boron-Doped Diamond Electrode
Institute of Analytical Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology, Bratislava
Keywords: amlodipine, boron-doped diamond electrode, differential pulse voltammetry, detection limit
The boron-doped diamond electrode (BDDE) as a perspective electrochemical sensor in association with differential pulse voltammetry was used for a sensitive determination of Amlodipine (AML) was determined in pharmaceutical formulations and in urine using a BDDE. AML undergoes an irreversible electrochemical oxidation with a peak potential of ca. +0,75 V (vs. Ag/AgCl, 3 mol l1 KCl in a mixture of Britton-Robinson buffer of pH 5 and methanol, 10:1). The obtained parameters were as follows: the linear concentration range at 2·107 6·106 mol l1 and at 6·106 3.8·105 mol l1, detection limit 7.4·108 mol l1 and relative standard deviation 3.6 % at 9.9·106 mol l1 AML, n = 20). The proposed procedure was used in the analysis of commercial tablets and model urine samples with good recoveries. The method is simple, rapid, sensitive and of good repeatability.
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