Voltammetric characteristics of miconazole and its cathodic stripping voltammetric determination
Miconazole is reduced at mercury electrode above pH 6 involving organometallic compound formation, responsible for an anomalous polarographic behavior. The electrodic process presents a large contribution of the adsorption effects. The drug can be determined by cathodic stripping voltammetry from 8.0 x 10-8 to 1, 5 x 10-6 molL-1 in Britton-Robinson buffer pH 8.0, when pre-accumulated for 30s at an accumulation potential of 0V. A relative standard deviation of 3.8% was obtained for ten measurements of 1.0 x 10-7 molL-1 miconazole in B-R buffer pH 8.0 and a limit detection of 1, 7 x 10-8 molL-1 was determined using 60s of deposition time and scan rate of 100 mVs-1. The proposed method is simple, precise and it was applied successfully for the determination of the miconazole in pure form and in commercial formulations, showing mean recoveries of 99.7-98.4%.
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Academia Brasileira de Ciências
2002
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oai:scielo:S0001-376520020003000052002-10-09Voltammetric characteristics of miconazole and its cathodic stripping voltammetric determinationPEREIRA,FRANCISCO C.STRADIOTTO,NELSON R.ZANONI,MARIA VALNICE B. miconazole voltammetry electroanalysis determination Miconazole is reduced at mercury electrode above pH 6 involving organometallic compound formation, responsible for an anomalous polarographic behavior. The electrodic process presents a large contribution of the adsorption effects. The drug can be determined by cathodic stripping voltammetry from 8.0 x 10-8 to 1, 5 x 10-6 molL-1 in Britton-Robinson buffer pH 8.0, when pre-accumulated for 30s at an accumulation potential of 0V. A relative standard deviation of 3.8% was obtained for ten measurements of 1.0 x 10-7 molL-1 miconazole in B-R buffer pH 8.0 and a limit detection of 1, 7 x 10-8 molL-1 was determined using 60s of deposition time and scan rate of 100 mVs-1. The proposed method is simple, precise and it was applied successfully for the determination of the miconazole in pure form and in commercial formulations, showing mean recoveries of 99.7-98.4%.info:eu-repo/semantics/openAccessAcademia Brasileira de CiênciasAnais da Academia Brasileira de Ciências v.74 n.3 20022002-09-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300005en10.1590/S0001-37652002000300005 |
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PEREIRA,FRANCISCO C. STRADIOTTO,NELSON R. ZANONI,MARIA VALNICE B. |
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PEREIRA,FRANCISCO C. STRADIOTTO,NELSON R. ZANONI,MARIA VALNICE B. Voltammetric characteristics of miconazole and its cathodic stripping voltammetric determination |
author_facet |
PEREIRA,FRANCISCO C. STRADIOTTO,NELSON R. ZANONI,MARIA VALNICE B. |
author_sort |
PEREIRA,FRANCISCO C. |
title |
Voltammetric characteristics of miconazole and its cathodic stripping voltammetric determination |
title_short |
Voltammetric characteristics of miconazole and its cathodic stripping voltammetric determination |
title_full |
Voltammetric characteristics of miconazole and its cathodic stripping voltammetric determination |
title_fullStr |
Voltammetric characteristics of miconazole and its cathodic stripping voltammetric determination |
title_full_unstemmed |
Voltammetric characteristics of miconazole and its cathodic stripping voltammetric determination |
title_sort |
voltammetric characteristics of miconazole and its cathodic stripping voltammetric determination |
description |
Miconazole is reduced at mercury electrode above pH 6 involving organometallic compound formation, responsible for an anomalous polarographic behavior. The electrodic process presents a large contribution of the adsorption effects. The drug can be determined by cathodic stripping voltammetry from 8.0 x 10-8 to 1, 5 x 10-6 molL-1 in Britton-Robinson buffer pH 8.0, when pre-accumulated for 30s at an accumulation potential of 0V. A relative standard deviation of 3.8% was obtained for ten measurements of 1.0 x 10-7 molL-1 miconazole in B-R buffer pH 8.0 and a limit detection of 1, 7 x 10-8 molL-1 was determined using 60s of deposition time and scan rate of 100 mVs-1. The proposed method is simple, precise and it was applied successfully for the determination of the miconazole in pure form and in commercial formulations, showing mean recoveries of 99.7-98.4%. |
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Academia Brasileira de Ciências |
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2002 |
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