Isoquercitrin quercetin 3-0-glucoside

Flavonols. The most common flavonols (3-hydroxyflavones) include kaempferol (3,5,7,4 -tetrahydroxyflavone), quercetin (3,5,7,3, 4 -pentahydroxyflavone), myricetin (3,5,7,3, 4, 5 -hexahydroxyflavone), quercitrin (quercetin 3-0-rhamnoside), isoquercitrin (quercetin 3-0-glucoside), isorhamnetin (quercetin 3 -methyl ether) and rutin (quercetin... 

Isoquercitrin (= Quercetin 3-0-glucoside) Widespread Gossypium herbaceum (Malvaceae), Moms alba (Moraceae) HfV-l protease (< 108 (tM) [42]... 

Compounds 1 = 4-hydroxycoumarin 2 = umbelliferon 3 = 4-methyl-esculetin 4 = isopimpinellin 5 = esculin 6 = flavone 7 = a-naphtoflavone 8 = kaempferol 9 = quercetin 10 = isoquercitrin 11 = robinetin 12 = robinin 13 = myricetin 14 = luteolin 7-O-glucoside 15 = rutin 16 = hes-peretin 17 = hespiridin 18 = naringin 19 = pelargonin chloride 20 = polargonin chloride 21 = malvin chloride. 

Fig. 2.50. Profiles of calendula (a), milk-thistle (b) and passion flower (c) tinctures (each 60 per cent v/v, ethanol) with the HPLC-MS attributions of the components detected, lc = quercetin-3-O-ruti-nosylrhamnoside 2c = rutin 3c = isorhamnetin-3-O-ruti-nosylrhamnoside 4c = isoquercitrin 5c = isorhamnetin-3-O-gluco-sylglucoside 6c = narcissin 7c = isorhamnetin-3-O-glucoside lm = taxifolin 2m = siliydianin 3m = silychristin 4m = oxy derivative of silybin/isosilybin isomers 5m and 6m = 2,3-dehydro derivatives of silybin/isosilybin isomers 7m = silybin 8m = isosilybin lp = 6,8-diC-glucosylapigenin 2p = isoschaftoside 3p = shaftoside 4p = homoorientin 5p = isovetexin-2"-0-glucoside 6p = vitexin. Reprinted with permission from A. R. Biha et al. [150].

Hibiscus mutabilis L. Fu Rong Yie (Cotton rose) (leaf, flower) Isoquercitrin, hyperoside, rutin, quercetin-4-glucoside, quercetin, quercimeritrin.50 Applied to swellings, bums, ulcers. Internally lung ailments, cough, dysuria, menorrhagia. 

Querdtrin, isoquercitrin, hyperoside, rutin, quercetin-3-O-arabinoside (=avicularin) Myricetin-3-O-galactoside and -digalactosidc Kaempferol-3-O-glucoside and rhamnoside Isorhamnetin-3-O-galactaside, hesperidin Chlorogenic and caffeic acid... 

Phytochemistry Fruits contain vitamin C, sugars, tannins, flavonoids (cyanidin-3-O-glucoside, phloridzin, isoquercitrin and glycosides of kaempferol, quercetin, taxifolin, and eriodictyol), conjugates of methyl gallate, pigments (carotene, lycopene, xanthophyll, etc.), pectins, pentosan and vitamins Kj, B, P and E. The seeds contain fatty oils and the flowers contain essential oil (Tohnachev 1976 Khalmatov et al. 1984 Hvattum 2002). 

Chromatographic analysis was used by Williams and Wender (1952) to identify isoquercitrin in Vitis vinifera. Isoquercitrin is the glucoside of quercetin, and its isolation appears to he new. Previously quercitrin. 

Figure 9b. Vitexin-2 -0-a-L-rhamnoside (32), isorhamnetin-3-O-rutinoside (narcissi. 33), kaempferol-3-O-mtinoside (nicotiflorin. 34) quercetin-3-O-P-D-glucoside (isoquercitrin. 35) and vitexin (alpigenin 8-C-glucoside. 36).

Dicksonia gigantea Karst. Quercetin 3-0-p-D-glucoside (Isoquercitrin) (361) 223... 

---