Direct mapping of hydrangea blue-complex in sepal tissues of Hydrangea macrophylla.

ABSTRACT: The original sepal color of Hydrangea macrophylla is blue, although it is well known that sepal color easily changes from blue through purple to red. All the colors are due to a unique anthocyanin, 3-O-glucosyldelphinidin, and both aluminum ion (Al³⁺) and copigments, 5-O-caffeoyl and/or 5-O-p-coumaroylquinic acid are essential for blue coloration. A mixture of 3-O-glucosyldelphinidin, 5-O-acylquinic acid, and Al³⁺ in a buffer solution at pH 4 produces a stable blue solution with visible absorption and circular dichroism spectra identical to those of the sepals, then, we named this blue pigment as 'hydrangea blue-complex'. The hydrangea blue-complex consists of 3-O-glucosyldelphinidin, Al³⁺, and 5-O-acylquinic acid in a ratio 1:1:1 as determined by the elect

SUBMITTER: Ito T 

PROVIDER: S-EPMC6443790 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature