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Effect of heating, UV irradiation and pH on stability of the anthocyanin copigment complex.

The influences of temperature, UV irradiation, pH and copigment concentration on the stability of a copigmentation complex were investigated. The copigments selected for the study included: Catechin, Chlorogenic acid and Gallic acid. Five levels of copigment concentration as: 0, 120, 240, 480, 960 mg L(-1) were examined. The copigmentation effect increased with copigment contain. UV irradiation had a stronger degradation effect on the copigmentation complex than heating at 80 degrees C. The suitable pH for copigmentation complex was in pH 3.5. In this study, catechin predominate among copigments.