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The adsorptive and electrochemical behaviors of meloxicam (MLC) was investigated on a glassy carbon electrode that was electrochemically treated by anodic oxidation at +1.8 V, following potential cycling in the potential range from -0.8 to 1.0 V vs. Ag/AgCl reference electrode. The resulting electrode showed a good activity to improve the electrochemical response of the drug. MLC was accumulated at an electrochemically activated glassy carbon electrode (phosphate buffer pH 6) in a certain time and then determined by linear sweep voltammetry. The oxidative peak currents showed a linear function in the concentration ranges of 0.02 to 10 microM using a 240 s preconcentration time. The preconcentration medium-exchange approach was utilized for the selective determination of the drug in spiked urine and plasma samples with satisfactory results. The recovery values of the proposed method obtained 105% (RSD 2.5%) and 100% (RSD 1.8%) for urine and plasma samples, respectively. Also, the proposed method has been successfully used for determination of MLC in tablets.

Electrochemical Determination of Meloxicam in Pharmaceutical Preparation and Biological Fluids Using Oxidized Glassy Carbon Electrodes