Acylated and non-acylated flavonol monoglycosides from the Indian minor spice Nagkesar (Mammea longifolia).
A methanol extract of nagkesar (buds of Mammea longifolia), which showed strong radical scavenging activity, yielded 13 compounds by separations using column chromatography and HPLC. Structure elucidation of these compounds was achieved by (1)H and (13)C NMR, including DQF-COSY, TOCSY, DEPT, HMQC, HSQC, and HMBC. They include two new compounds, quercetin 3-O-(2' ',4' 'di-E-p-coumaroyl)-alpha-L-rhamno-pyranoside and quercetin 3-O-(3' ',4' '-di-E-p-coumaroyl)-alpha-L-rhamnopyranoside, along with known compounds kaempferol, quercetin, the isopropylidenedioxy derivative of shikimic acid, kaempferol 3-O-(2' ',4' '-di-E-p-coumaroyl)-alpha-L-rhamnopyranoside, kaempferol 3-O-(3' ',4' '-di-E-p-coumaroyl)-alpha-L-rhamnopyranoside, kaempferol 3-O-alpha-L-rhamnopyranoside, quercetin 3-O-alpha-L-rhamnopyranoside, shikimic acid, kaempferol 3-O-beta-D-glucopyranoside, quercetin 3-O-beta-D-glucopyranoside, and beta-sitosterol 3-O-beta-D-glucopyranoside.
Jagan Mohan Rao
Lingamallu
L
National Food Research Institute, 2-1-12, Kannondai, Tsukuba, Ibaraki 305-8642, Japan. ljnatpro@yahoo.com
Yada
Hiroshi
H
Ono
Hiroshi
H
Yoshida
Mitsuru
M
D000215:Acylation; D002851:Chromatography, High Pressure Liquid; D005419:Flavonoids / Q000032:analysis*; D044948:Flavonols; D016166:Free Radical Scavengers; D009682:Magnetic Resonance Spectroscopy; D029581:Malpighiaceae / Q000737:chemistry*; D000432:Methanol; D010936:Plant Extracts / Q000032:analysis*; D011794:Quercetin / Q000032:analysis / Q000737:chemistry; D012765:Shikimic Acid / Q000032:analysis / Q000737:chemistry; D017365:Spices / Q000032:analysis*
D005419:Flavonoids; D044948:Flavonols; D016166:Free Radical Scavengers; D010936:Plant Extracts; D012765:Shikimic Acid; D011794:Quercetin; D000432:Methanol