Camellianoside, a novel antioxidant glycoside from the leaves of Camellia japonica.
A novel flavonol glycoside named camellianoside and three known flavonol glycosides were isolated from the leaves of Camellia japonica. The structure of camellianoside was established as quercetin-3-O-beta-D-xylopyranosyl-(1-->3)-O-alpha-L-rhamnopyranosyl-(1-->6)-O-beta-D-glucopyranoside by spectroscopic and chemical methods. The antioxidant activities of these glycosides evaluated by the diphenylpicrylhydrazyl (DPPH) radical scavenging reaction was higher than those of L-cysteine and L-ascorbic acid used as the reference antioxidants.
Onodera
Ken-Ichi
K
JST Collaboration of Regional Entities for the Advancement of Technological Excellence in Okinawa, Okinawa Health Biotechnology Research Development Center, Japan. kenichi@ttc.co.jp
Hanashiro
Kaoru
K
Yasumoto
Takeshi
T
D000975:Antioxidants / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D001713:Biphenyl Compounds; D028244:Camellia / Q000737:chemistry*; D005609:Free Radicals / Q000037:antagonists & inhibitors / Q000737:chemistry; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods / Q000592:standards; D009844:Oligosaccharides / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D010851:Picrates / Q000037:antagonists & inhibitors / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry; D011794:Quercetin / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D012015:Reference Standards; D013329:Structure-Activity Relationship
D000975:Antioxidants; D001713:Biphenyl Compounds; D005609:Free Radicals; D006027:Glycosides; D009844:Oligosaccharides; D010851:Picrates; C514765:quercetin-3-O-xylopyranosyl-1-3-O-rhamnopyranosyl-1-6-O-glucopyranoside; D011794:Quercetin; C004931:1,1-diphenyl-2-picrylhydrazyl