Phenolic antioxidants from the leaves of Corchorus olitorius L.
Six phenolic antioxidative compounds [5-caffeoylquinic acid (chlorogenic acid), 3,5-dicaffeoylquinic acid, quercetin 3-galactoside, quercetin 3-glucoside, quercetin 3-(6-malonylglucoside), and quercetin 3-(6-malonylgalactoside) (tentative)] were identified from the leaves of Corchorus olitorius L. (moroheiya) by NMR and FAB-MS. The contents of these phenolic compounds, ascorbic acid, and alpha-tocopherol in C. olitorius leaves were determined, and their antioxidative activities were measured using the radical generator-initiated peroxidation of linoleic acid. The results obtained showed that 5-caffeoylquinic acid was a predominant phenolic antioxidant in C. olitorius leaves.
Azuma
K
K
National Research Institute of Vegetables, Ornamental Plants and Tea, Ano, Mie 514-2392, Japan. azumak@nivot.affrc.go.jp
Nakayama
M
M
Koshioka
M
M
Ippoushi
K
K
Yamaguchi
Y
Y
Kohata
K
K
Yamauchi
Y
Y
Ito
H
H
Higashio
H
H
D000975:Antioxidants / Q000032:analysis* / Q000302:isolation & purification; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D010636:Phenols / Q000032:analysis* / Q000302:isolation & purification; D010936:Plant Extracts / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry*; D016339:Spectrometry, Mass, Fast Atom Bombardment; D014675:Vegetables / Q000737:chemistry*
D000975:Antioxidants; D010636:Phenols; D010936:Plant Extracts