Quercitrine

Quercitrin (quercetin glycoside) [522-12-3] M 302.2, m 168 , 176-178 . Crystd from aq EtOH and dried at 135° to give the higher melting form. 

Flavonoids (Quercetin, Rutin, Hyperoside, Quercitrin) [15] Method... 

Fig. 1 Separation of flavonoids fluorescence scanning curve of rutin (1), hyperoside (2), quercitrin (3) and quercetin (4).

Fig. 1 Chromatography of flavonoids. 1. Extract. Solidaginis 2. Rutin — chlorogenic acid — isoquercitrin — quercitrin 3. Extract. Hyperici 4. Hyp>erosid — quercetin-3-arabinosid — hypericin — quercetin 5. Extract. Betulae...

The chromatogram zones, that were slightly fluorescent even before derivatization, appeared as yellow zones on a colorless background, under long-wavelength light (X = 365 nm) they fluoresced, yellow in the case of rutin (hRf 20-25), red-yellow in the case of quercitrin (hRf 60-65) and quercetin (h/ f 85-90). 

Fig. 1 Reflectance scan (A) and fluorescence scan (B) of a chromatogram track with 200 ng (A) and 100 ng (B) each substance per chromatogram zone 1 = rutin, 2 = quercitrin, 3 = quercetin.

The following fiRf values were obtained quercetin 90 — 95, hypericin 75 — 80, quercitrin 60 — 65, quercetin-3-arabinoside 55 — 60, isoquercitrin 45 — 50, hyperoside 40—45, chlorogenic acid 30 — 35, rutin 20—25 (Fig. 1). 

Quercitrin 149, 279, 280, 323 Quinaldic acid 171 Quinine alkaloids 88 Quinine, pH-dependent change of fluorescence color 91 Quinoline alkaloids 66... 

Sumac Rhus genus Gallic acid, ellagic acid, quercitrin, kaempferol... 

Fig. 2.45. Gradient elution chromatogram of flavonoids investigated. Peak identification 1 = naringin 2 = hesperidin 3 = quercitrin 4 = myricetin 5 = naringenin 6 = hesperetin 7 = luteolin 8 = apigenin 9 = flavone 10 = acacetin. Reprinted with permission from M. A. Hawryt et al. [136].

Fig. 2.49. Profile of Hypericum perforatum extract with the H LC-MS attributions of the components detected. 1 = chlorogenic acid isomer 2 = 3-0- -coumaroylquinic acid 3 = chlorogenic acid 4 = rutin 5 = hyperoside 6 = isoquercitrin 7 = 3,3, , , 7-pentahydroxyflavanone 7-0-rhamnopyranoside 8 = quercitrin 9 = quercetin 10 = 13,118 tapigenin 11 = pSeudohypericin 12 = hypericin 13 = hyperforin analogue 14 = hyperform dialogue 15 = hyperforin 16 = adhyperforin. Reprinted with permission from M. Brolis eta. [ ].

A new poly(7-oxobomene-5,6-dicarboxylic acid-Wod -norbomene)-coa(cd silica has been synthesized and applied for the separation of flavonoids in model systems and in the extracts of onion, elder flower blossom, lime blossom, St. John s Wort and red wine. Separation was performed in a (150 X 4 mm i.d. particle size 7 /rm) column at room temperature. Flavonoids (quercitrin, myricetin, quercetin, kaempferol and acacetin) were separated with gradient elution water-ACN (20 mmol TFA) from 78 22 to 70 30 v/v in 3min. The flow rate was 2 ml/min. The separation of the standard mixture is shown in Fig. 2.51. It has been stated that the method is rapid, accurate and the MS detection makes possible the reliable identification of flavonoids [153],... 

Fig. 2.51. LC of a flavone standard mixture. For chromatographic conditions see text. Peak identification 1 = quercitrin 2 = myricetin 3 = quercetin 4 = kaempferol 5 = acacetin. Reprinted with permission from C. W. Huck et al. [153].

Other glycoflavonoids (rutin, nicotiflorin, hyperoside and iso-quercitrin) were purified and identified from Tripodanthus acutifolius (Ruiz and Pavon) Van Tieghem (Loranthaceae) leaves." These compounds showed bactericidal effect at a concentration of 4 mg/mL... 

Fabjan, N. Rode, J. Kosir, 1. J. Wang, Z. Zhang, Z. Kreft, I. Tartary Buckwheat (Fagopyrum tataricum Gaertn.) as a Source of Dietary Rutin and Quercitrin. J. Agric. Food Chem. 2003, 51, 6452-6455. 

Op de Beck, P. et al., Quercitrin 3 -sulphate from leaves of Leea guineensis. Phytochemistry, 47, 1171, 1998. 

Flavonoids Leaves, stalk, buds Quercetin, hyperoside, quercitrin, isoquercitrin, 13, 118 biapigenin... 

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