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Journal of Thermal Analysis and Calorimetry

, Volume 134, Issue 1, pp 749–756 | Cite as

Kinetics of heterogeneous-induced degradation for artesunate and artemether

  • Denisa Circioban
  • Ionuţ Ledeţi
  • Gabriela Vlase
  • Adriana Ledeţi
  • Carmen Axente
  • Titus Vlase
  • Cristina Dehelean
Article

Abstract

This paper presents the results obtained after the investigation of two artemisinin derived sesquiterpenes, namely artesunate and artemether, currently studied for their antitumor properties. The chosen methods of analysis included UATR–FTIR spectroscopy, characterization of the thermal behavior (TG/DTG/HF) in oxidative dynamic atmosphere, and a complete kinetic analysis. The latter was realized using two integral methods (Kissinger–Akahira–Sunose and Flynn–Wall–Ozawa), a differential one (Friedman), and was later completed with the modified NPK method. The study showed that both compounds show similar thermal stability in terms of apparent activation energies and the degradation processes occur in two parallel steps for each compound, this being solely due to chemical transformations.

Keywords

Sesquiterpene Isoconversional kinetic study Artesunate Artemether NPK method 

Abbreviations

T

Time

T

Temperature

Α

Conversion degree

f(α)

The differential conversion function

R

The universal gas constant

g(α)

The integral conversion function

β

The heating rate

k(T)

The temperature dependence function

A

The pre-exponential factor

Ea

The apparent activation energy given by the Arrhenius equation

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  • Denisa Circioban
    • 1
  • Ionuţ Ledeţi
    • 2
  • Gabriela Vlase
    • 3
  • Adriana Ledeţi
    • 2
  • Carmen Axente
    • 2
  • Titus Vlase
    • 3
  • Cristina Dehelean
    • 1
    • 2
  1. 1.Faculty of PharmacyUniversity of Medicine and Pharmacy Tirgu MuresTârgu MureşRomania
  2. 2.Faculty of PharmacyUniversity of Medicine and Pharmacy “Victor Babeş”TimişoaraRomania
  3. 3.Research Centre for Thermal Analysis in Environmental ProblemsWest University of TimisoaraTimişoaraRomania

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