Adv Pharm Bull. 2015;5(4):523-529.
doi: 10.15171/apb.2015.071
PMID: 26819925
PMCID: PMC4729354
Scopus id: 84949668205
  Abstract View: 524
  PDF Download: 285

Original Research

Thermal Analysis Investigation of Dapoxetine and Vardenafil Hydrochlorides using Molecular Orbital Calculations

Ali Kamal Attia 1 * , Eglal R. Souaya 2, Ethar A. Soliman 1

1 National Organization for Drug Control and Research, P.O. Box 29, Cairo, Egypt.
2 Department of Chemistry, Faculty of Science, Ain Shams University, Egypt.


Purpose: Thermal analysis techniques have been used to study the thermal behavior of dapoxetine and vardenafil hydrochlorides and confirmed using semi-empirical molecular orbital calculations.

Methods: Thermogravimetric analysis, derivative thermogravimetry, differential thermal analysis and differential scanning calorimetry were used to determine the thermal behavior and purity of the drugs under investigation. Thermodynamic parameters such as activation energy, enthalpy, entropy and Gibbs free energy were calculated.

Results: Thermal behavior of DAP and VAR were confirmed using by semi-empirical molecular orbital calculations. The purity values were found to be 99.97% and 99.95% for dapoxetine and vardenafil hydrochlorides, respectively. The purity of dapoxetine and vardenafil hydrochlorides is similar to that found by reported methods according to DSC data.

Conclusion: Thermal analysis justifies its application in quality control of pharmaceutical compounds due to its simplicity, sensitivity and low operational costs.

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Submitted: 20 May 2015
Revised: 20 Jun 2015
Accepted: 30 Jul 2015
First published online: 30 Nov 2015
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