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The mechanism of co-pigmentation of anthocyanins in aqueous solutions

Authors
Journal
Phytochemistry
0031-9422
Publisher
Elsevier
Publication Date
Volume
29
Issue
4
Identifiers
DOI: 10.1016/0031-9422(90)85411-8
Keywords
  • Anthocyanin
  • Chlorogenic Acid
  • Co-Pigmentation Mechanism
  • Complexation
  • Hydrophobic Interactions
  • Cyanidin 3
  • 5-Diglucoside
  • Malvidin 3
  • 5-Diglucoside.

Abstract

Abstract Factors affecting co-pigmentation of anthocyanins with chlorogenic acid in aqueous solutions were studied. The anthocyanins used were cyanidin 3,5-diglucoside, malvidin 3,5-diglucoside, cyanidin 3-glucoside and malvidin 3-glucoside. The variables studied were concentration of anthocyanin, concentration of chlorogenic acid, pH, temperature, and solvent. On the basis of visible absorption spectrometric measurements, a mechanism for the co-pigmentation/complexation of anthocyanins with chlorogenic acid is established. This mechanism involves formation of 1:1 pigment-co-pigment complexes forced together by hydrophobic interactions. Indeed, the extent of the pigment-co-pigment association is under the control of the unique hydrogen-bonded molecular structure of liquid water, and is affected by pH, temperature and composition of the medium.

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