Resumo

NARAYANA, Badiadka  e  VEENA, Kunnummel. Spectrophotometric Determination of Citalopram Hydrobromide in Pharmaceuticals. J. Mex. Chem. Soc [online]. 2010, vol.54, n.2, pp.98-102. ISSN 1870-249X.

Simple, rapid and sensitive methods are described for the spectrophotometric determination of citalopram hydrobromide (CIT) in pharmaceuticals. The method A is based on the oxidation of citalopram by a known excess of bromate-bromide mixture in hydrochloric acid medium, reduction of the residual oxidant by a fixed amount of iron(II) and the formation of iron(III)-thiocyanate-complex which is measured at 480 nm. In the method B, 1,10-phenanthroline is used as a complexing agent and the formation of iron(II)-1,10-phenanth-roline, which is measured at 510 nm. The system obeys Beer's law in the concentration range of 1.0-7.0 µg mL^-1 of CIT for method A and 0.6-6.2 µg mL^-1 of CIT for method B. No interference observed from common pharmaceutical adjuvants. Both methods are equally precise as shown by the relative standard deviation values less than 2%. The apparent molar absorptivities and Sandell's sensitivity for method A and B are found to be 2.10 × 10⁴ L mol^-1 cm^-1, 0.019 µg cm^-2 , 7.30 × 10⁴ L mol^-1 cm^-1 and 5.5 × 10^-3 µg cm^-2, respectively. The methods have been successfully applied to the determination of citalopram hydrobromide in pure and dosage forms.

Palavras-chave : Citalopram hydrobromide; spectrophotometry; bromate-bromide mixture; thiocyanate; 1,10-phenanthroline.

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