Thermal degradation of betanine in various water alcohol model systems
1993
Thermal degradation of betanine in the model systems water/glycerol, water/ethylene glycol and water/ethanol has been carried out at temperatures ranging from 60 degrees C to 86 degrees C. Water activity was chosen to be 0.87 and pH was adjusted to 5.0. The lowest stability of betanine and the lowest activation energy have been found for the system water/ethanol. This is in accordance with the idea of a nucleophilic attack on the structure > N+=CH- as the first step of the betanine degradation. It has been shown that the Guggenheim method is the most suitable for the treatment of experimental kinetic curves.
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