Kinetics of the Degradation and Regeneration of Betanine
1985; Wiley; Volume: 50; Issue: 4 Linguagem: Inglês
10.1111/j.1365-2621.1985.tb13024.x
ISSN1750-3841
AutoresA. S. HUANG, Joachim H. von Elbe,
Tópico(s)Antioxidant Activity and Oxidative Stress
ResumoABSTRACT The degradation and regeneration kinetics of betanine in solution at pH 5.0 under nitrogen and oxygen were studied at 65, 75, 85 and 90°C. HPLC was used to monitor the concentration changes of betanine and its degradation products, betalamic acid and cyclodopa‐S‐0‐glycoside. Betanine is partially regenerated. Rate constants for the degradation reaction were calculated and the activation energies for the forward and reverse reactions were determined to be 17.6 and 0.64 Kcal/mole, respectively. The enthalpy change (ΔH) was calculated as 16.8 Kcal. The presence of betalamic acid and cyclodopa‐5‐0‐glycoside favor regeneration of the pigment. A kinetic reaction model which accounts for the reversibility of the degradation reaction was adopted and can predict the amount of betanine remaining before and after regeneration of the pigment.
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