SENSITIVE SURFACTANT-MEDIATED SPECTROFLUORIMETRIC DETERMINATION OF SILDENAFIL

WANG, CHIEN CHUN; SILVA, RAUL; MASI, ADRIANA; FERNANDEZ, LILIANA

Analytical Methods

The Royal Society of Chemistry

Año: 2010 vol. 2 p. 519 - 524

1759-9660

Two simple and sensitive surfactant-mediated spectrofluorimetric methods for the determination of sildenafil are proposed in this paper. These methods are based on the interaction of sildenafil with normal micelles of HTAB (hexadecyltrimethylammonium bromide, method A) and the formation of ion-association complexes of sildenafil with SDS (sodium dodecyl sulfate, method B). In both methods, the formed species produce considerable fluorescence enhancement, which allows sildenafil to be quantitatively determined. Linearity was obtained for sildenafil in the concentration range 0.004 to 25 mgmL1 with a detection limit of 0.0012 mgmL1 by method A; and a linearity range of 0.005 to 50.0 mg mL1 with a detection limit of 0.0016 mg mL1 by method B. The proposed methods have been applied to the analysis of bulk drug, tablets, herbal medicine and beverages. Validation processes were performed by recovery studies and statistical analysis with satisfactory results.