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Chemical Papers

, Volume 70, Issue 8, pp 1094–1105 | Cite as

TG-DTA-FTIR analysis and isoconversional reaction profiles for thermal and thermo-oxidative degradation processes in black chokeberry (Aroniamelanocarpa)

  • Bojan Janković
  • Milena Marinović-Cincović
  • Marija Janković
Original Paper

Abstract

The thermal and thermo-oxidative processes in Aroniamelanocarpa (black chokeberry) were investigated using combined thermo-analytical (TG-DTA) and spectroscopic (FTIR) experimental techniques. Isoconversional analysis revealed that the process in an inert (argon) atmosphere was probably governed by chlorogenic acid degradation, where autocatalysis (described by the empirical Šesták-Berggren model) might occur due to water already present in the early stages of the process through hydrolysis. Thermal degradation is described by the intrinsic kinetic parameters, where the degradation rate increases proportionally with an increase in the heating rate. Under oxidative conditions, the process was found to be primarily driven by neochlorogenic acid degradation. The thermo-oxidative degradation of Aroniamelanocarpa fresh samples can be described by two competitive reactions, where it was established that a cyanidin-3-glucosylrutinoside degradation made a significant contribution to a comprehensive kinetics. This study showed the targeting of the neochlorogenic acid in Aroniamelanocarpa fresh samples to have a strong hydrogen-donating activity, thereby rendering it capable of very efficiently entrapping the peroxy radicals. Current research has demonstrated that the relative contribution of the two competitive reactions to the overall process is highly dependent on the heating rate of the system under consideration.

Keywords

black chokeberry thermal stress TG-FTIR intrinsic kinetic parameters autocatalytic mechanism hydrogen-donating activity competitive reactions 

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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2016

Authors and Affiliations

  • Bojan Janković
    • 1
  • Milena Marinović-Cincović
    • 2
  • Marija Janković
    • 3
  1. 1.Department for Dynamics and Matter Structure, Faculty of Physical ChemistryUniversity of BelgradeBelgradeSerbia
  2. 2.Laboratory for Radiation Chemistry and PhysicsBelgradeSerbia
  3. 3.Radiation and Environmental Protection Department, Institute of Nuclear Sciences “Vinča”University of BelgradeBelgradeSerbia

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