异鼠李素
糖苷
化学
山奈酚
抗氧化剂
槲皮素
韧皮部
植物化学
传统医学
植物
生物化学
生物
立体化学
医学
作者
Robert H. Cichewicz,Muraleedharan G. Nair
摘要
Daylily (Hemerocallis spp.) flowers are utilized as an important ingredient in traditional Asian cuisine and are also valued for their reputed medicinal effects. In studies of the bioactive methanol and aqueous methanol extracts of lyophilized Hemerocallis cv. Stella de Oro flowers, kaempferol, quercetin, and isorhamnetin 3-O-glycosides (1−9), phenethyl β-d-glucopyranoside (10), orcinol β-d-glucopyranoside (11), phloretin 2'-O-β-d-glucopyranoside (12), phloretin 2'-O-β-d-xylopyranosyl-(1→6)-β-d-glucopyranoside (13), a new naphthalene glycoside, stelladerol (14), and an amino acid (longitubanine A) (15) have been isolated. All of these compounds were tested for their antioxidant and cyclooxygenase inhibitory activities. Stelladerol was found to possess strong antioxidant properties, inhibiting lipid oxidation by 94.6% ± 1.4 at 10 μM in an in vitro assay. Several of the flavonol 3-O-glycoside isolates also demonstrated modest antioxidant activities at 10 μM. None of the isolates inhibited cyclooxygenase activity at 100 μM. Keywords: Daylily; edible flower; Hemerocallis; antioxidant activity; lipid oxidation; stelladerol; flavonol 3-O-glycoside; phenolic glycoside
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