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Spectrophotometric determination of certain cephalosporins in pure form and in pharmaceutical formulations
Faculty
Pharmacy
Year:
2004
Type of Publication:
Article
Pages:
2831-2835
Authors:
Amin, AS, Ragab, GH
DOI:
10.1016/j.saa.2003.12.049
Journal:
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY PERGAMON-ELSEVIER SCIENCE LTD
Volume:
60
Research Area:
Spectroscopy
ISSN
ISI:000224050200019
Keywords :
cefotaxime sodium, cefuroxime sodium, ceftriaxone disodium, metol, potassium dichromate, spectrophotometry, dosage forms
Abstract:
A simple and reproducible spectrophotometeric method for the assay of cefotaxime sodium, cefuroxime sodium, and ceftriaxone disodium with metol-chromium(VI) reagent has been developed. The procedure is based on direct oxidation of metol by potassium dichromate in presence of drug in acidic medium and subsequent formation of ternary complex. Beer's law is obeyed in the range 0.2-28 mug ml(-1) at lambda(max) 520 nm. For more accurate analysis, Ringbom optimum concentration range is found to be 0.8-26.5 mug ml(-1). The molar absorptivity and Sandell sensitivity were calculated. Six replicate analysis of solutions containing seven different concentrations of the examined drugs were carried out and gave a mean correlation coefficient less than or equal to0.9996; the factors of the regression line equation for the three cephalosporins were calculated. The proposed method was applied to the determination of the examined drugs in pharmaceutical formulations and the results demonstrated that the method is equally accurate, precise, and reproducible as the official methods. (C) 2004 Elsevier B.V. All rights reserved.
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