Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 147, Issue -, Pages 257-261Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2015.03.095
Keywords
Spectrophotometry; Ratio difference (Delta P) method; Dual wavelength in ratio spectra method; DWRS; Ternary mixture
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A simple selective spectrophotometric method for determination of compounds in ternary mixture was developed by combining the resolution power of two well-known methods that are commonly used for binary mixtures; namely ratio difference method and dual wavelength. The new method (dual wavelength in ratio spectra) was successfully applied for the determination of a ternary mixture of betamethasone dipropionate (BM), clotrimazole (CT) and benzyl alcohol (BA) in pure powder form and in their pharmaceutical preparation. The difference in amplitudes (Delta P) in the ratio spectra at 252.0 and 258.0 nm (Delta P252.0-258.0nm) corresponds to BM, while Delta P266.8-255.4nm and Delta P254.2-243.5nm corresponds to CT and BA, respectively. The method was validated as per the USP 2005 guidelines. The developed method can be used in quality control laboratories for routine analysis of compounds in ternary mixtures. (C) 2015 Elsevier B.V. All rights reserved.
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