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Kinetics of the Degradation and Regeneration of Betanine
Author(s) -
HUANG A. S.,
ELBE J. H. VON
Publication year - 1985
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1985.tb13024.x
Subject(s) - degradation (telecommunications) , kinetics , chemistry , regeneration (biology) , kinetic energy , nitrogen , reaction rate constant , pigment , enthalpy , chromatography , oxygen , organic chemistry , thermodynamics , biology , telecommunications , physics , quantum mechanics , computer science , microbiology and biotechnology
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.