Development and validation of alternative methods by non-aqueous acid-base titration and derivative ultraviolet spectrophotometry for quantification of sildenafil in raw material and tablets

  • Taízia Dutra Silva Federal University of Minas Gerais; Faculty of Pharmacy; Department of Pharmaceutical Products
  • Cibele Rodrigues Toledo Federal University of Minas Gerais; Faculty of Pharmacy; Department of Pharmaceutical Products
  • Cristina Duarte Vianna-Soares Federal University of Minas Gerais; Faculty of Pharmacy; Department of Pharmaceutical Products
Keywords: Sildenafil citrate, Vasodilator, Derivative ultraviolet spectrophotometry, Non-aqueous acid-base titrimetry, Sildenafil citrate/quality control.

Abstract

Sildenafil citrate (SILC) is a potent phosphodiesterase-5 inhibitor used for erectile dysfunction and pulmonary hypertension. This study shows two simple, fast and alternative analytical methods for SILC determination by non-aqueous titration and by derivative ultraviolet spectrophotometry (DUS) in active pharmaceutical ingredient and/or dosage forms. The quantitation method of SILC active pharmaceutical ingredient by non-aqueous acid-base titration was developed using methanol as solvent and 0.1 mol/L of perchloric acid in acetic acid as titrant. The endpoint was potentiometrically detected. The non-aqueous titration method shows satisfactory repeatability and intermediate precision (RSD 0.70-1.09%). The neutralization reaction occurred in the stoichiometric ratio 1:1 in methanol. The determination of SILC active pharmaceutical ingredient or dosage forms by DUS was developed in the linear range from 10 to 40 µg/mL, in 0.01 mol/L HCl, using the first order zero-peak method at λ 256 nm. The DUS method shows selectivity toward tablets excipients, appropriate linearity (R2 0.9996), trueness (recovery range 98.86-99.30%), repeatability and intermediate precision in three concentration levels (RSD 1.17-1.28%; 1.29-1.71%, respectively). Therefore, the methods developed are excellent alternatives to sophisticated instrumental methods and can be easily applied in any pharmaceutical laboratory routine due to simple and fast executions.

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Published
2017-01-01
How to Cite
Silva, T., Toledo, C., & Vianna-Soares, C. (2017). Development and validation of alternative methods by non-aqueous acid-base titration and derivative ultraviolet spectrophotometry for quantification of sildenafil in raw material and tablets. Brazilian Journal of Pharmaceutical Sciences, 53(1), e15181-. https://doi.org/10.1590/s2175-97902017000115181
Section
Articles