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E-Journal of Chemistry
Volume 9 (2012), Issue 1, Pages 443-450

Micellar Liquid Chromatography for the Determination of Some Less Prescribed Benzodiazepines

Hoonka Subhra,1,3 Bose Devasish,1,3 Esteve-Romero Josep,2 and Durgbanshi Abhilasha1,3

1Department of Crim. and Forensic Sciences, Dr. H.S.Gour University, Sagar, India
2Àrea de Química Analítica, Universitat Jaume I, 12080, Castelló, Spain
3Department of Applied Chemistry, Institute of Technology, Banaras Hindu University, Varanasi (UP), India

Received 19 November 2010; Accepted 30 December 2010

Copyright © 2012 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A simple chromatographic procedure is reported for the determination of some less prescribed but equally important benzodiazepines (Clotiazepam, clozapine and pinazepam) in serum. The optimization studies have been made in CN, C18 and C8 columns, using mobile phase containing sodium dodecyl sulphate (SDS) modified with either propanol, butanol or pentanol. The method proposed for the determination of the three benzodiazepines using a mobile phase of 0.13 M SDS, 2.4% pentanol-0.01 M phosphate buffer- 0.1% triethylamine (pH 7) at 25°C and UV detection (240 nm) in a C8 column. The serum samples was injected directly, without any pretreatment, eluted in less than 8 min, in accordance to their relative polarities, as indicated by their octanol-water partition coefficients. The limits of detection (ng/mL) was in the 1.6 to 5.6 and 7 to 87 range, for aqueous and serum samples, respectively. Repeatability and intermediate precision was tested for three different concentrations of the drugs, resulting in the 0.1 to 2 range. The results obtained here for the separation of the three benzodiazepines in serum were also counter checked at Department of Bio-analytical Chemistry, Universitat Jaume I, Castelló, Spain.