Abstract
A sinapoylglucoside and two kaempferol glycosides were isolated from Matthiola incana ‘Vintage white’, and determined to be 1-O-(trans-sinapoyl)-β-glucopyranoside, kaempferol 3-O-(2-O-α-rhamnopyranosyl)-β-glucopyranoside-7-O-α-rhamnopyranoside, and kaempferol 3-O-(2-O-α-rhamnopyranosyl)-β-arabinopyranoside-7-O-α-rhamnopyranoside as major components by chemical and spectroscopic methods. The quantitative distribution of these three compounds from ‘Vintage white’ was equally detected in eight other cyanic color cultivars of the Vintage series. It is known that 1-O-(trans-sinapoyl)-β-glucopyranoside is an important donor to synthesize the sinapoyl anthocyanin in Arabidopsis. Our previous study showed that the higher the ratio of sinapoyl anthocyanin, the greater the activity of intramolecular copigmentation, resulting in advanced blue coloration in nonwhite flowers of Matthiola incana. Thus, 1-O-(trans-sinapoyl)-β-glucopyranoside may play an important role in the blue coloration caused by intramolecular copigmentation in flowers of Matthiola incana.
