RESUMO
The inhibition of superoxide production by human neutrophils has been used to screen New Zealand's unique biota for anti-inflammatory natural products. Bioactivity-directed isolation on an extract of the sponge Dysidea cf. cristagalli led to a new sesquiterpene-quinone (4) with anti-inflammatory activity, plus acetylated hydroquinone (3). These compounds inhibited superoxide production in vitro with IC50's of 3 microM (3) and 11 microM (4).
Assuntos
Anti-Inflamatórios não Esteroides/isolamento & purificação , Dysidea/química , Quinonas/isolamento & purificação , Sesquiterpenos/isolamento & purificação , Animais , Anti-Inflamatórios não Esteroides/química , Anti-Inflamatórios não Esteroides/farmacologia , Humanos , Concentração Inibidora 50 , Estrutura Molecular , Neutrófilos/efeitos dos fármacos , Nova Zelândia , Quinonas/química , Quinonas/farmacologia , Sesquiterpenos/química , Sesquiterpenos/farmacologia , Superóxidos/metabolismoRESUMO
A new compound, 5-O-(4'-[beta-d-glucopyranosyl]-trans-feruloyl)quinic acid (GPFQ, 10), is reported from the medicinal plant goldenseal (Hydrastis canadensis). A new HPLC method is described and used to show that GPFQ is a potential marker for goldenseal roots (1.0% w/w) and rhizomes (2.3%). GPFQ was found at much lower levels in stems (<0.1%) and could not be detected in leaves. Neochlorogenic acid (9), which has not previously been reported from goldenseal, and chlorogenic acid (6) reached their highest levels in leaves (0.9% 9 and 0.5% 6). The main alkaloids, hydrastine (1) and berberine (2), were highest in rhizomes (2.8% 1 and 4.6% 2), but palmatine (5) was not found in genuine goldenseal.
