SYNTHESIS OF DESIGNED ACYLQUINIC ACID DERIVATIVES INVOLVED IN BLUE COLOR DEVELOPMENT OF HYDRANGEA AND THEIR CO-PIGMENTATION EFFECT

摘要

The blue sepal color of hydrangea may be developed by an unstable supramolecular metal-complex pigment composed of delphinidin 3-glucoside(1),5-O-caffeoylquinic acid(2)and 5-O-p-coumaroylquinic acid(3)as co-pigments and Al3+in aqueous solution.To clarify the structure of blue pigment and the role of co-pigments,various acylquinic acid derivatives were designed and synthesized.As a result of reproduction experiment using the synthesized co-pigments,it was revealed that 1-COOH,1-OH and 5-O-ester of quinic acid moiety was essential for blue color development.The aromatic plane of the 5-O-acyl moiety contributes to the stability of the blue complex.