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- Title
Acylated Flavonoid Glycosides are the Main Pigments that Determine the Flower Colour of the Brazilian Native Tree Tibouchina pulchra (Cham.) Cogn.
- Authors
Rezende, Fernanda Mendes; Ferreira, Marcelo José Pena; Clausen, Mads Hartvig; Rossi, Magdalena; Furlan, Claudia Maria; Epifano, Francesco
- Abstract
Tibouchina pulchra (Cham.) Cogn. is a plant native to Brazil whose genus and family (Melastomataceae) are poorly studied with regards to its metabolite profile. Phenolic pigments of pink flowers were studied by ultra-performance liquid chromatography with a photodiode array detector and electrospray ionization quadrupole time-of-flight mass spectrometry. Therein, twenty-three flavonoids were identified with eight flavonols isolated by preparative high-performance liquid chromatography and analysed by one- and two-dimensional nuclear magnetic resonance. Kaempferol derivatives were the main flavonols, encompassing almost half of the detected compounds with different substitution patterns, such as glucoside, pentosides, galloyl-glucoside, p-coumaroyl-glucoside, and glucuronide. Concerning the anthocyanins, petunidin p-coumaroyl-hexoside acetylpentoside and malvidin p-coumaroyl-hexoside acetylpentoside were identified and agreed with previous reports on acylated anthocyanins from Melastomataceae. A new kaempferol glucoside was identified as kaempferol-(2′′-O-methyl)-4′-O-α-d-glucopyranoside. Moreover, twelve compounds were described for the first time in the genus with five being new to the family, contributing to the chemical characterisation of these taxa.
- Subjects
FLAVONOID glycosides; BIOLOGICAL pigments; PLANT species; PHOTODIODES; ELECTROSPRAY ionization mass spectrometry
- Publication
Molecules, 2019, Vol 24, Issue 4, p718
- ISSN
1420-3049
- Publication type
Article
- DOI
10.3390/molecules24040718