Antioxidant activity of coumarins and flavonols from the resinous exudate of Haplopappus multifolius.
Phytochemistry
; 67(10): 984-7, 2006 May.
Article
em En
| MEDLINE
| ID: mdl-16684545
The antioxidant activity of eight coumarins and two flavonols isolated from Haplopappus multifolius was studied with the DPPH radical method. Results show that a high concentration of phenolic coumarins and the presence of quercetin and rhamnetin in the exudates could account for the protection of the plant against oxidative stress. Structures for the coumarins 6-hydroxy-7-[(E,E)-3',7'-dimethyl-2',4',7'-octatrienyloxy] coumarin and 7-[(E)-3'-methyl-4'-hydroxy-2'-butenyloxy] coumarin are proposed on the basis of spectroscopic evidence.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Resinas Vegetais
/
Cumarínicos
/
Haplopappus
/
Flavonóis
/
Antioxidantes
Idioma:
En
Revista:
Phytochemistry
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
Chile
País de publicação:
Reino Unido