Rutin onion

Fig. 2.88. Chromatograms obtained from standard, onion, wine and plasma samples, (a) standard polyhydro xyflavones (5.00/ig/ml of each), (b) onion skin etract, (c) wine, and (d) plasma spiked with quercetin (5.00/ig/ml). Detection at 370 nm. Peaks 1 = rutin 2 = myricetin 3 = fisetin (internal standard) 4 = morin 5 = quercetin 6 = kaempferol. Reprinted with permission from H. Tsuchiya [210].

Flavonols Quercetin, kaempferol and myricetin and their glycosides (rutin, etc.) Widely distributed. Main sources Onions, apples, tea, red grapes, and broccoli, citrus fruits and maize. Antiproliferative effect [69], Inhibition of angiogenesis [108], Cardiovascular properties [115, 116], protection of DNA damage [60, 137, 138.]. 10-500... 

An interesting reaction is that of the flavones with aluminum ions. The very faintly yellow-colored flavones can be made to dye tissues a bright yellow. An instance occurred within the author s experience, when a tripe-dresser complained that when boiled with onions in an aluminum kettle his tripe became bright yellow in color. This was due to the quercetin glycosides (rutin, etc.) present in the yellow-skinned onions he had happened to use. Had he chosen purple-skinned or white-skinned varieties this difficulty would probably not have been encountered, since these contain much smaller quantities of flavone (c/. p. 283). 

Onion skin and wine extracts were analyzed for bioflavonoid content (quercetin, kaempferol, fisetin, rutin, myricetin, morin). A 50°C Cg column (A = 370 nm) and a 71/28/1 water/acetonitrile/TFA mobile phase generated a 15-min elution. Peaks were resolved and shapes were excellent. The wine extract had a large early-eluting interfering set of peaks (three analytes eluted on the shoulders of these peaks). A linear range of 0.1-30 pg/mL was reported [1139],... 

A generally widespread glycoside of many plants is rutin. Avicularin and isoquercitrin occur, for example, in blueberries Vaccinium myrtillus, Ericaceae) spiraein, together with rutin, is a constituent of onion (onions are a primary source of dietary... 

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