title: Acylated anthocyanins from leaves of Oxalis triangularis.
abstract: The novel anthocyanins, malvidin 3-O-(6-O-(4-O-malonyl-alpha-rhamnopyranosyl)-beta-glucopyranoside)-5-O-beta-glucopyranoside (2), malvidin 3-O-(6-O-alpha-rhamnopyranosyl-beta-glucopyranoside)-5-O-(6-O-malonyl-beta-glucopyranoside) (3), malvidin 3-O-(6-O-(4-O-malonyl-alpha-rhamnopyranosyl)-beta-glucopyranoside)-5-O-(6-O-malonyl-beta-glucopyranoside) (4), malvidin 3-O-(6-O-(4-O-malonyl-alpha-rhamnopyranosyl)-beta-glucopyranoside) (5) and malvidin 3-O-(6-O-(Z)-p-coumaroyl-beta-glucopyranoside)-5-O-beta-glucopyranoside (6), in addition to the 3-O-(6-O-alpha-rhamnopyranosyl-beta-glucopyranoside)-5-O-beta-glucopyranoside (1) and the 3-O-(6-O-(E)-p-coumaroyl-beta-glucopyranoside)-5-O-beta-glucopyranoside (7) of malvidin have been isolated from purple leaves of Oxalis triangularis A. St.-Hil. In pigments 2, 4 and 5 a malonyl unit is linked to the rhamnose 4-position, which has not been reported previously for any anthocyanin before. The identifications were mainly based on 2D NMR spectroscopy and electrospray MS.
authors.affiliation: Department of Chemistry, University of Bergen, Norway. Torgils.Fossen@kj.uib.no
authors.forename: Torgils
authors.initials: T
authors.lastname: Fossen
authors.forename: Saleh
authors.initials: S
authors.lastname: Rayyan
authors.forename: Maya H
authors.initials: MH
authors.lastname: Holmberg
authors.forename: Håvard S
authors.initials: HS
authors.lastname: Nateland
authors.forename: Øyvind M
authors.initials: ØM
authors.lastname: Andersen
mesh_terms: D000872:Anthocyanins / Q000737:chemistry*; D019684:Magnoliopsida / Q000737:chemistry*; D015394:Molecular Structure; D018515:Plant Leaves / Q000737:chemistry*
chemical_list: D000872:Anthocyanins