Optimized and validated spectrophotometric methods for the determination of raloxifene in pharmaceuticals using permanganate. 2009

Kanakapura Basavaiah, and Kalsang Tharpa, and Urdigere Rangachar Anil Kumar, and Nagaraju Rajedraprasad, and Salmara ganeshbhat Hiriyanna, and Kanakapura Basavaiah Vinay
Department of Chemistry, University of Mysore, Manasagangothri, Mysore-570006, India. basavaiahk@yahoo.co.in

Two simple and sensitive spectrophotometric methods are described for the determination of raloxifene hydrochloride (RLX) in pure form and in tablets. The first method (method A) is based on the formation of a yellowish-brown chromogen peaking at 430 nm when RLX was reacted with permanganate in acetic acid medium. In the second method (method B), RLX was reacted with a measured excess of permanganate in H2SO4 medium followed by the spectrophotometric measurement of the unreacted KMnO4 at 550 nm. Under the optimized experimental conditions, Beer's law is obeyed in the concentration range 0.6-6.0 and 1.5-15.0 microg mL(-1) with molar absorptivity of 7.01 x 10(4) and 2.8 x 10(4) L mol(-1) cm(-1) for method A and method B, respectively. The limits of detection (LOD) and quantification (LOQ) have also been reported. The intra-day and inter-day RSD and RE values at three different concentrations were assessed. The proposed methods were applied to the commercially available tablets, and the results were statistically compared with those of the reference method. The accuracy and reliability of the methods were further ascertained by recovery studies.

UI MeSH Term Description Entries
D010087 Oxides Binary compounds of oxygen containing the anion O(2-). The anion combines with metals to form alkaline oxides and non-metals to form acidic oxides. Oxide
D013053 Spectrophotometry The art or process of comparing photometrically the relative intensities of the light in different parts of the spectrum.
D013607 Tablets Solid dosage forms, of varying weight, size, and shape, which may be molded or compressed, and which contain a medicinal substance in pure or diluted form. (Dorland, 28th ed) Tablet
D017895 Manganese Compounds Inorganic chemicals that contain manganese as an integral part of the molecule. Compounds, Manganese
D020849 Raloxifene Hydrochloride A second generation selective estrogen receptor modulator (SERM) used to prevent osteoporosis in postmenopausal women. It has estrogen agonist effects on bone and cholesterol metabolism but behaves as a complete estrogen antagonist on mammary gland and uterine tissue. Raloxifene,Evista,Keoxifene,Keoxifene Hydrochloride,LY 139481,LY 156758,LY-139481,LY-156758,Raloxifene HCl,LY139481,LY156758

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