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Voltammetric determination of diclofenac sodium using tyrosine - modified carbon paste electrode / B. K. Chethana in Industrial & engineering chemistry research, Vol.51 N° 31 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol.51 N° 31 (Août 2012) . - pp. 10287-10295 Titre : Voltammetric determination of diclofenac sodium using tyrosine - modified carbon paste electrode Type de document : texte imprimé Auteurs : B. K. Chethana, Auteur ; S. Basavanna, Auteur ; Y. Arthoba Naik, Auteur Année de publication : 2012 Article en page(s) : pp. 10287-10295 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Electrodes Résumé : The oxidative behavior of diclofenac sodium (DCF) has been investigated by cyclic voltammetric and differential pulse voltammetric techniques, using a Tyrosine-modified carbon paste electrode (TCPE). Cyclic voltammetry was used to study the influence of pH on the anodic peak current of DCF. The solution conditions and operating parameters were optimized. The phosphate buffer (PBS) of pH 7.0 was selected as a suitable analytical medium in which DCF exhibited a sensitive diffusion-controlled oxidative peak at 0.67 V (vs Ag/AgCl). The peak current varied linearly with DCF concentration in the range between 10 μM and 140 μM with a detection limit of 3.28 μM. The applicability of the proposed method was illustrated by the determination of DCF present in pharmaceutical samples and human urine samples. A mean recovery of DCF in the tablet was 99.5%, with a relative standard deviation of 1.15%. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26234058 [article] Voltammetric determination of diclofenac sodium using tyrosine - modified carbon paste electrode [texte imprimé] / B. K. Chethana, Auteur ; S. Basavanna, Auteur ; Y. Arthoba Naik, Auteur . - 2012 . - pp. 10287-10295. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol.51 N° 31 (Août 2012) . - pp. 10287-10295 Mots-clés : Electrodes Résumé : The oxidative behavior of diclofenac sodium (DCF) has been investigated by cyclic voltammetric and differential pulse voltammetric techniques, using a Tyrosine-modified carbon paste electrode (TCPE). Cyclic voltammetry was used to study the influence of pH on the anodic peak current of DCF. The solution conditions and operating parameters were optimized. The phosphate buffer (PBS) of pH 7.0 was selected as a suitable analytical medium in which DCF exhibited a sensitive diffusion-controlled oxidative peak at 0.67 V (vs Ag/AgCl). The peak current varied linearly with DCF concentration in the range between 10 μM and 140 μM with a detection limit of 3.28 μM. The applicability of the proposed method was illustrated by the determination of DCF present in pharmaceutical samples and human urine samples. A mean recovery of DCF in the tablet was 99.5%, with a relative standard deviation of 1.15%. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26234058