Effect of pH on the Degradation and Regeneration of Betanine

摘要

ABSTRACTThe influence of pH (3.0–7.0) on betanine stability in solution was studied based on proposed reversible reaction kinetics. The forward and reverse rate constants and their activation energies were determined and found to be pH dependent. The influence of pH on two degradation products showed that betalamic acid was most stable as the pH of the reaction increased, while cyclodopa‐5–0‐glucoside was more stable as the pH decreased. The results support the reported conclusion that betanine is most stable at an intermediate pH range (4