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

Pak J Biol Sci. 2007 Jan 15;10(2):267-72. doi: 10.3923/pjbs.2007.267.272.


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.

Publication types

  • Comparative Study

MeSH terms

  • Anthocyanins / analysis*
  • Biotechnology / methods
  • Brassica / chemistry*
  • Catechin / chemistry
  • Chlorogenic Acid / chemistry
  • Gallic Acid / chemistry
  • Hydrogen-Ion Concentration
  • Iran
  • Pigments, Biological / chemistry*
  • Pigments, Biological / radiation effects
  • Temperature*
  • Ultraviolet Rays*


  • Anthocyanins
  • Pigments, Biological
  • Chlorogenic Acid
  • Gallic Acid
  • Catechin