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Title: Acylated anthocyanins from leaves of Oxalis triangularis
Authors: Fossen, Torgils
Rayyan, Saleh
Holmberg, Maya H.
Nateland, Havard Solheim
Andersen, Oyvind M.
Keywords: Oxalis - Analysis
Issue Date: Apr-2005
Abstract: The novel anthocyanins, malvidin 3-O-(6-O-(4-O-malonyl-a-rhamnopyranosyl)-b-glucopyranoside)-5-O-b-glucopyranoside (2), malvidin 3-O-(6-O-a-rhamnopyranosyl-b-glucopyranoside)-5-O-(6-O-malonyl-b-glucopyranoside) (3), malvidin 3-O-(6-O-(4-Omalonyl- a-rhamnopyranosyl)-b-glucopyranoside)-5-O-(6-O-malonyl-b-glucopyranoside) (4), malvidin 3-O-(6-O-(4-O-malonyl-arhamnopyranosyl)- b-glucopyranoside) (5) and malvidin 3-O-(6-O-(Z)-p-coumaroyl-b-glucopyranoside)-5-O-b-glucopyranoside (6), in addition to the 3-O-(6-O-a-rhamnopyranosyl-b-glucopyranoside)-5-O-b-glucopyranoside (1) and the 3-O-(6-O-(E)-p-coumaroyl- b-glucopyranoside)-5-O-b-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.
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