title: Influence of trans-cis isomerisation of coumaric acid substituents on colour variance and stabilisation in anthocyanins.
abstract: The recently isolated pigments from Petunia integrifolia and Triteleia bridgesii present a distinct feature that sheds new light on the understanding of intramolecular copigmentation of anthocyanins. These are among the infrequent anthocyanins that naturally present a coumaric acid substituent in both cis and trans forms. As a consequence, the two isomers demonstrate substantial variations of their thermodynamic and kinetic constants and also colour properties. A possible explanation for these characteristics is presented, making use of molecular modelling and taking into account the three-dimensional structures of the pigments.
authors.affiliation: Laboratoire de Chimie des Polyphénols, UMR 7509 du CNRS, Université Louis Pasteur, Faculté de Chimie, 1, rue Blaise Pascal, 67008 Strasbourg, France.
authors.forename: F
authors.initials: F
authors.lastname: George
authors.forename: P
authors.initials: P
authors.lastname: Figueiredo
authors.forename: K
authors.initials: K
authors.lastname: Toki
authors.forename: F
authors.initials: F
authors.lastname: Tatsuzawa
authors.forename: N
authors.initials: N
authors.lastname: Saito
authors.forename: R
authors.initials: R
authors.lastname: Brouillard
mesh_terms: D000872:Anthocyanins / Q000737:chemistry*; D003373:Coumaric Acids / Q000737:chemistry*; D007536:Isomerism; D007700:Kinetics; D008958:Models, Molecular; D013056:Spectrophotometry, Ultraviolet; D013816:Thermodynamics
chemical_list: D000872:Anthocyanins; D003373:Coumaric Acids