Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 50, Issue 1, Pages 87-91Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf010914k
Keywords
daylily; edible flower; Hemerocallis; antioxidant activity; lipid oxidation; stelladerol; flavonol 3-O-glycoside; phenolic glycoside
Funding
- NCRR NIH HHS [1S10 RR 04750] Funding Source: Medline
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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 beta-D-glucopyranoside (10), orcinol beta-D-glucopyranoside (11), phloretin 2'-O-beta-D-glucopyranoside (12), phloretin 2'-O-beta-D-xylopyranosyl-(1-->6)-beta-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 muM in an in vitro assay. Several of the flavonol 3-O-glycoside isolates also demonstrated modest antioxidant activities at 10 muM. None of the isolates inhibited cyclooxygenase activity at 100 muM.
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