Kinetics of the thermal degradation of cyanidin-3-rutinoside and peonidin-3-rutinoside

Abstract

The kinetics of the thermal degradation of two anthocyanins, namely Cyanidin-3-rutinoside and peonidin.-3-rutinoside, depending on the pH and the biochemical composition of the solvent has been investigated. The results obtained indicate that the temperature and the pH of the medium exert strong influence on the kinetics of the degradation. The structure of the anthocyanins and biochemical composition of the solvent do not effect on the kinetics of the degradation. The kinetics of the thermal degradation of Cyanidin-3-rutinoside and peonidin-3-rutinoside proceeds as a first order reaction. The rate constants (K · 10−5 · sec−1), the experimental energy of activation, the enthalpy and entropy of activation, the period of halfdecay τ $${\raise0.5ex\hbox{$\scriptstyle 1$}\kern-0.1em/\kern-0.15em\lower0.25ex\hbox{$\scriptstyle 2$}}$$ and factorQ 10 have been calculated.