Fisetin

Eosin Flavonoids Morin Flavonol, fisetin, robinetin Quercetin Rutin condensation products of urea, formaldehyde and methanol [126], pesticide derivatives [127] sweetening agents [128, 129] anion-active and nonionogenic surface-active agents [130] steroids, pesticides [29,132, 133] pesticides [134—137] vanadium in various oxidation states [138] uracil derivatives [139]... 

Note A range of pesticides can be detected on cellulose layers using 3-hydroxyflavones without prior bromination. Thus, the natural fluorescence of robinetin or fisetin, which is weak in a non-polar environment, is significantly enhanced by the presence of polar pesticides [2, 5, 7, 8],... 

Purple Orchil Flavonoid dyi Muriciclae and Rapaninae Rocella and Ochrolechia es + Fisetin Morin Maclurin... 

Flaveria haumanii, Cotinus coggygria, Coreopsis spp. and pre Columbian Andean textiles Okanine, luteolin, butein (as aglycones, glycosides or as methyl ethers), quercetin, isorhamnetin (as sulfate esters), sulfuretin, fisetin, hydroxybenzoic acids HCI/Me0H/H20, HCOOH/MeOH A H20 B ACN C H20 with HCOOH 254, 350 nm/ESI (+) Column C4 7... 

Jimenez M, Escribano-Cebrian J and Garcia-Carmona, F. 1998. Oxidation of the flavonol fisetin by polyphenol oxidase. Biochim Biophys Acta 27 1425(3) 534-542. 

It is interesting that only dihydroquercetin has the redox potential much lower than that of ascorbate (282 mV) and kaempferol, luteolin, and fisetin have the values close to ascorbate. 

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].

Cotinus coggygria Scop. Huang Lu (Smoke tree) (leaf, twig) Myricetin, myricitrin, fisetin, fustin.33 Antipyretic. 

Gleditsia horrida Willd. G. sinensis Lam. G. xylocarpa Hance Zao Ci (Chinese honey locust) (leaf, fruit, seed) Saponin, arabinon, gleditsin, fisetin, fustin.50 Anthelmintic, febrifuge, treat cough, dysentery, flatulence, rectal prolapse, stroke, throat numbness, tetanus, emitic. 

Pistacia lentiscus L. Ru Xiang (resin) Masticinic acid, masticonic acid, masticoresene, fisetin, fustin, gallic acid, quercetin, taxifolin.49-50 Antitumor, antitussive, analgesic, sedative in gastralgia, cardiodynia, mastitis, peptic ulcer. 

The most important group of compounds for our purposes, the flavonoids, are shown with coumarins in Table VII. The flavonoid agly-cones precipitated nearly quantitatively except for fisetin, myricetin, and tectochrysin. Tectochrysin, 5-hydroxy-7-methoxyflavone, still preceipi-tated to 51% without phloroglucinol even though two of the three... 

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