STABILITY STUDY OF AMLODIPINE BESYLATE AND BISOPROLOL FUMARATE IN AQUEOUS SOLUTIONS

Authors

  • Irena Kasagić Vujanović Medical Faculty, University of Banjaluka, Save Mrkalja 14, Banjaluka, Republic of Srpska, B&H
  • Dijana Jelić Medical Faculty, University of Banjaluka, Save Mrkalja 14, Banjaluka, Republic of Srpska, B&H
  • Vesna Antunović Medical Faculty, University of Banjaluka, Save Mrkalja 14, Banjaluka, Republic of Srpska, B&H
  • Biljana Jančić Stojanović Pharmacy Faculty, University of Belgrade, Vojvode Stepe Stepanovića 450, Belgrade, Serbia
  • Darko Ivanović Pharmacy Faculty, University of Belgrade, Vojvode Stepe Stepanovića 450, Belgrade, Serbia

DOI:

https://doi.org/10.7251/cm.v2i5.1734

Abstract

Valuable information concerning stability of compounds can be obtained by using different media (water, hydrochloric acid or sodium hydroxide) for dissolution of active pharmaceutical substances. Furthermore, additional knowledge is gained by performing experiments at different temperatures. This research paper deals with the stability of amlodipine besylate and bisoprolol fumarate in different media at different temperatures, whereby certain conclusions are drawn. For stability assessment, chemical kinetics approach was used, and constant rate (k), half-time (t1/2) and activation energy (Ea) were used for prediction of compound stability degree. The stability of amlodipine besylate and bisoprolol fumarate were tested, both separately and in mixture, in water and in 0.01M HCl. All the investigated solutions were treated at two temperatures 25° and 70°C at the following time intervals: 0, 1 h, 24 h, 48 h and 72 h. Hydrophilic Interaction Liquid Chromatography – HILIC method, previously developed and validated, was used. On the basis of obtained results it was concluded that amlodipine-besylate was more stable in water than in acid medium, more stable in mixture rather than individually and more stable at lower temperatures.

This was confirmed by the obtained values of monitored parameters: amlodipine besylate Ea = 30.68 kJ mol-1, k (25 °C) = 0.000333 mM h-1, k (70 °C) = 0.00169 mM h-1; amlodipine besylate in mixture Ea = 42,414 kJ mol-1, k (25 °C) = 1.27∙10-4 mM h-1,
k (70 °C) = 0.0012 mM h-1. Based on the obtained approximate Ea value for bisoprolol fumarate in acid (59 kJ mol-1) and in water (56 kJ mol-1), bisoprolol fumarate showed excellent stability against the media in which it was studied. On the other hand, the temperature had a significant effect on the stability of bisoprolol fumarate. These results provide the relevant information about the stability of the tested active substances, and may be of importance during the development of an appropriate pharmaceutical product. A bigger influence on the stability of bisoprolol fumarate had a temperature effect.

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Published

2014-12-15