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- W2034874561 abstract "Two nonsteroid anti-inflammatory drugs, Piroxicam and Tenoxicam, are shown to be strongly adsorbed on mercury electrodes. Using this phenomenon to accumulate these compounds at the static mercury-drop electrode prior to square-wave voltammetric measurement, sub-nanomole sensitivities are readily achieved. A preconcentration potential of —0.6 V vs. Ag/AgCl/ KCl(s) was used for both drugs. The adsorptive stripping response was evaluated with respect to accumulation time and potential, analyte concentration, and electrolyte nature and concentration. Ascorbic acid up to 1X10-4 M has no effect on the Piroxicam peak, but results in enhanced response for the Tenoxicam adsorptive stripping peak. Studies were performed at p. 4.0 and 2.0 for the two drugs; at these values two and four electrons are transferred, respectively. The detection limit was 7X1010 M for Piroxicam and 1X10-10 M for Tenoxicam, the latter being even more sensitive (5×10-11 M) in the presence of ascorbic acid. Applicability of square wave voltammetry to urine samples was demonstrated. The detection limit is 5×10-8 M and 5×10-9 M (in presence of 1×10-5 M ascorbic acid) for Piroxicam and Tenoxicam, respectively, in urine samples diluted ten-fold with the supporting electrolyte." @default.
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- W2034874561 date "1990-04-01" @default.
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- W2034874561 title "Square Wave and Square Wave Adsorptive Stripping Voltammetric Comparison of the Anti-Inflammatory Drugs Piroxicam and Tenoxicam" @default.
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- W2034874561 doi "https://doi.org/10.2116/analsci.6.245" @default.
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