Use of a Sonogel-Carbon electrode modified with bentonite for the determination of diazepam and chlordiazepoxide hydrochloride in tablets and their metabolite oxazepam in urine

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• 作者：Ahmed Hosny Naggar^a ; ^b ; Mohammed ElKaoutit^a ; Ignacio Naranjo-Rodriguez^a ; ^{ignacio.naranjo@uca.es} ; Abd El-Aziz Yossef El-Sayed^b ; José ; Luis Hidalgo-Hidalgo de Cisneros^a
• 关键词：Square Wave Voltammetry ; Diazepam ; Oxazepam ; Chlordiazepoxide hydrochloride ; Sonogel Carbon electrodes ; Bentonite ; Tablets ; Human urine samples
• 刊名：Talanta
• 出版年：2012
• 出版时间：30 January, 2012
• 年：2012
• 卷：89
• 期：Complete
• 页码：448-454
• 全文大小：345 K

文摘

Sonogel-Carbon electrode (SngCE) modified with bentonite (BENT) shows an interesting alternative electrode to be used in the determination of 1,4-benzodiazepines by square wave adsorptive cathodic stripping voltammetry (SWAdCSV). Diazepam (DZ) and chlordiazepoxide hydrochloride (CPZ), were determined using SngCE modified by 5 % BENT. An electrochemical study of different parameters (such as pH, buffer type, ionic strength, accumulation potential, scan rate, and accumulation time) which affect the determination of DZ and CPZ is reported. Linear concentration ranges of 0.028-0.256 ¦Ìg mL^? DZ (r = 0.9997) and 0.034-0.302 ¦Ìg mL^? CPZ (r = 0.9997) are successfully obtained after an accumulation time of 60 s. The quantification and detection limits were calculated to be 14.0 and 4.0 ng mL^? for DZ, and 16.0 and 5.0 ng mL^? for CPZ, respectively.

The surface of the proposed electrode was characterized by scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX).

The developed method was applied to the analysis of commercially available tablets and human urine real samples. Analysis was performed with better precision, very low detection limits, and faster than previously reported voltammetric techniques.