Stictic acid derivatives from the lichen Usnea articulata and their antioxidant activities.
J Nat Prod
; 70(7): 1218-20, 2007 Jul.
Article
em En
| MEDLINE
| ID: mdl-17629329
ABSTRACT
Two new beta-orcinol depsidones, 1 and 2, together with 13 known compounds were isolated from the lichen Usnea articulata. The structures of 1 and 2 were elucidated by spectroscopic analyses and those of known compounds by comparison of their spectroscopic data with literature values or by direct comparison with authentic standards. Compounds 1, 2, and 5 exhibited moderate antiradical activity in the 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay. The depsidones 4 and 5 showed better superoxide anion scavenging activity (IC50 = 566 and 580 microM, respectively) than quercetin (IC50 = 754 microM).
Buscar no Google
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Oxepinas
/
Sequestradores de Radicais Livres
/
Usnea
/
Depsídeos
/
Compostos Heterocíclicos de 4 ou mais Anéis
/
Lactonas
/
Antioxidantes
País/Região como assunto:
Asia
Idioma:
En
Ano de publicação:
2007
Tipo de documento:
Article