Now showing items 1-10 of 10
Xeractinol - A new flavanonol C-glucoside from Paepalanthus argenteus var. argenteus (Bongard) Hensold (Eriocaulaceae)
(Journal of the Brazilian Chemical Society, 2007-01-01) [Artigo]
New compound isolated from methanolic extract from the leaves of Paepalanthus argenteus var. argenteus (Bongard) Hensold was characterized as xeractinol, a new dihydroflavonol C-glucoside. The structure was elucidated on ...
Chemical profile of the polar extract of Paepalanthus microphyllus (Guill.) Kunth (Eriocaulaceae)
(Revista Brasileira de Ciências Farmacêuticas, 2004-09-01) [Artigo]
Do extrato etanólico dos capítulos de Paepalanthus microphyllus, isolou-se um derivado do ácido cafeico (1). Sua estrutura foi caracterizada por métodos espectroscópicos (RMN mono e bi-dimensionais) e por espetrometria de ...
Xanthones and flavonoids from Leiothrix curvifolia and Leiothrix flavescens
(Phytochemistry, 2001-04-01) [Artigo]
8-Carboxymethyl-1,6-dihydroxy-3,5-dimethoxyxanthone 8-carboxymethyl-1,5,6-trihydroxy-3-methoxyxanthone and 8-carboxy-methyl-1,3,5,6-tetrahydroxyxanthone were isolated from the capitula of Leiothrix curvifolia and Leiothrix ...
Naphthopyranone glycosides from Paepalanthus bromelioides
(Phytochemistry, 1998-09-03) [Artigo]
Two new naphtho[2,3-C]pyran-1-one glycosides, paepalantine-9-O-β-D- glucopyranoside and paepalantine-9-O-β-D-allopyranosyl(1 → 6)glucopyranoside, were isolated from an ethanolic extract of capitula from Paepalanthus ...
Isocoumarin from Paepalanthus bromelioides
(Phytochemistry, 1990-12-01) [Artigo]
The new isocoumarin, 9,10-dihydroxy-5, 7-dimethoxy-1H-naphtho(2,3c)pyran-1-one, was isolated from the capitula of Paepalanthus bromelioides. The structure was established by means of the spectral data of the natural product ...
New Benzaldehyde and Benzopyran Compounds from the Endophytic Fungus Paraphaeosphaeria sp. F03 and Their Antimicrobial and Cytotoxic Activities *
(Planta Medica, 2019-08-01) [Artigo]
Three new benzaldehyde derivatives, sporulosaldeins A - C ( 1 - 3 ), and 3 new benzopyran derivatives, sporulosaldeins D - F ( 4 - 6 ), were discovered from an endophytic fungus, Paraphaeosphaeria sp. F03, which was isolated ...
Flavonol glycosides and a naphthopyranone glycoside from Paepalanthus macropodus (Eriocaulaceae)
(Biochemical Systematics and Ecology, 2002-03-01) [Artigo]
Ascorbic acid potentiates the cytotoxicity of the naphthoquinone 5-methoxy-3,4-dehydroxanthomegnin
(Phytochemistry, 2008-08-01) [Artigo]
The interaction of ascorbic acid with 5-methoxy-3,4-dehydroxanthomegnin, an 1,4-naphthoquinone, was investigated using the cytotoxic index for McCoy cells by neutral red assay. The synergstic effect was observed when such ...
Quercetagetin 7-methyl ether glycosides from Paepalanthus vellozioides and Paepalanthus latipes
(Phytochemistry, 1999-06-01) [Artigo]
Several new quercetagetin 7-methyl ether glycosides were characterized from the ethanolic extracts of scapes and leaves of Paepalanthus vellozioides and P. latipes. Their structures were determined mainly by 600 MHz NMR ...
Chemical profile of Eriocaulon ligulatum (Vell.) LB Smith (Eriocaulaceae)
(Biochemical Systematics and Ecology, 2005-11-01) [Artigo]
Two new and six known flavonoids and two known naphthopyranones have been isolated by chromatographic methods and spectrometrically identified in capitulae and scapes of Eriocaulon ligulatum (Vell.) L.B. Smith (Eriocaulaceac). ...