Iminodibenzyl as a novel coupling agent for the spectrophotometric determination of sulfonamide derivatives

Nagaraja, P. and Sunitha, K. R. and Vasantha, R. A. and Yathirajan, H. S. (2002) Iminodibenzyl as a novel coupling agent for the spectrophotometric determination of sulfonamide derivatives. EUROPEAN JOURNAL OF PHARMACEUTICS AND BIOPHARMACEUTICS, 53 (2). pp. 187-192.

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Official URL: http://dx.doi.org/10.1016/S0939-6411(01)00235-1

Abstract

A rapid. selective and simple spectrophotometric method for the determination of sulfa-drugs is described. The method is based on the formation of violet colored azo product by the diazotization of sulfonamides, viz. sulfathiazole (SFT), sulfadiazine (SFD), sulfacetamide (SFA), sulfamethoxazole (SFMx), sulfamerazine (SFMr), sulfaguanidine (SFG) and sulfadimidine (SFDd) followed by a coupling reaction with iminodibenzyl in alcohol medium. Absorbance of the resulting violet azo product is measured at 570-580 nm and is stable for 24 h at 27degreesC. Beer's law is obeyed in the concentration range of 0.05-6.0 mug ml(-1) at the wavelength of maximum absorption, The method is successfully employed for the determination of sulfonamides in various pharmaceutical preparations and common excipients used as additives in pharmaceuticals do not interfere in the proposed method. The method offers the advantages of simplicity, rapidity and sensitivity without the need for extraction or heating. A reaction mechanism is proposed for the formation of the violet azo product. (C) 2002 Elsevier Science B.V. All rights reserved.

Item Type: Article
Uncontrolled Keywords: sulfa-drugs; iminodibenzyl; diazotization; spectrophotometry; pharmaceuticals
Subjects: Physical Sciences > Chemistry
Divisions: PG Campuses > Manasagangotri, Mysore > Chemistry
Depositing User: Users 11 not found.
Date Deposited: 16 Apr 2013 05:38
Last Modified: 29 Aug 2013 11:27
URI: http://eprints.uni-mysore.ac.in/id/eprint/4344

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