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Antioxidant and photoprotective activity of a crude extract of Culcitium reflexum H.B.K. leaves and their major flavonoids.

Abstract：

:The aim of the present study was to evaluate the in vitro antioxidant and in vivo photoprotective activities of an ethanolic extract of Culcitium reflexum H.B.K. leaves (ECR extract). The antioxidant activity of the extract was assessed by means of three different in vitro tests: (1) bleaching of the stable 1,1-diphenyl-2-picrylhydrazyl radical; (2) peroxidation, induced by the water-soluble radical initiator 2,2'-azobis(2-amidinopropane)hydrochloride, on mixed dipalmitoylphosphatidylcholine/linoleic acid unilamellar vesicles; (3) UV radiation-induced peroxidation in phosphatidylcholine multilamellar vesicles. In all in vitro tests used the ECR extract showed a significant antioxidant effect. Furthermore, a gel formulation containing this extract proved, when topically applied, to afford a significant in vivo protection against UV-B-induced skin erythema in healthy human volunteers. Then, by chromatographic fractionation and spectroscopic methods, we identified some cinnamic acid derivatives and the major flavonoid constituents of the ECR extract, viz. the flavonols rutin, quercetin-3-O-beta-D-galactopyranoside-4'-O-beta-D-glucopyranoside, quercetin-3-O-beta-D-glucopyranoside, isorhamnetin-3-O-beta-D-galactopyranoside, quercetin and kaempferol.

journal_name

J Ethnopharmacol

journal_title

Journal of ethnopharmacology

authors

Aquino R,Morelli S,Tomaino A,Pellegrino M,Saija A,Grumetto L,Puglia C,Ventura D,Bonina F

doi

10.1016/s0378-8741(01)00379-8

keywords:

subject

Has Abstract

pub_date

2002-02-01 00:00:00

pages

183-91

issue

2

eissn

0378-8741

issn

1872-7573

pii

S0378874101003798

journal_volume

79

pub_type

杂志文章

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