Studies on the constituents of a Brazilian folk infusion. Isolation and structure elucidation of new triterpene saponins from Ilex amara leaves
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Data
2002-01-16
Autores
de Andrade, FDP
Piacente, S.
Pizza, C.
Vilegas, Wagner [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Amer Chemical Soc
Resumo
The isolation of three new triterpene saponins 3beta-O-beta-D-glucopyranosyl-(1-->3)-alpha-L-2-O-acetylara-binopyranosylolean-12-en-28-oic acid 28-O-beta-D-glucopyranosyl ester (2), 3beta-O-beta-D-glucopyranosyl-(1-->2)-alpha-L-O-arabinopyranosylurs-12-en-28-oic acid (3), and 3beta-O-beta-D-glucopyranosyl-(1-->2)-beta-D-O-galactopyranosylurs-12-en-28-oic acid (4) together with five known saponins and one flavonoid glycoside from the aqueous infusion of flex amara (Vellozo) Loes. leaves is reported. All structures were elucidated by spectroscopic methods, including the concerted application of one-dimensional (H-1, TOCSY, C-13, and C-13 DEPT NMR) and two-dimensional NMR techniques (DQF-COSY, HSQC, and HMBC).
Descrição
Palavras-chave
Ilex amara (Vellozo) Loes., Aquifollaceae, mate, Infusion, triterpene saponins, 1D and 2D NMR
Como citar
Journal of Agricultural and Food Chemistry. Washington: Amer Chemical Soc, v. 50, n. 2, p. 255-261, 2002.