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|Section2= }} Fisetin (3, 7, 3′, 4′-tetrahydroxyflavone) is a flavonol, a structurally distinct chemical substance that belongs to the flavonoid group of polyphenols. It can be found in many plants, where it serves as a colouring agent. It is also found in many fruits and vegetables, such as strawberries, apples, persimmons, onions and cucumbers. Its chemical formula was first described by Austrian chemist Josef Herzig in 1891. The biological activity of fisetin has been studied in many laboratory assays; like other polyphenols it has many activities. == Biological sources == Fisetin can be found in a wide variety of plants. It is found in Eudicotyledons, such as trees and shrubs in the family Fabaceae, such as the acacias ''Acacia greggii'' and ''Acacia berlandieri'',〔 the parrot tree (''Butea frondosa''), the honey locust (''Gleditsia triacanthos''), members of the family Anacardiaceae such as the ''Quebracho colorado'' and species of the genus ''Rhus'', which contains the sumacs. Along with myricetin, fisetin provides the color of the traditional yellow dye ''young fustic'', which was extracted from the Eurasian smoketree (''Rhus cotinus''). Many fruits and vegetables also contain fisetin, including strawberries apples,〔 and grapes.〔 Fisetin can be extracted from fruit and herbal sources in juices, wines, and infusions such as teas.〔 It is also found in Monocotyledons such as onions.〔 It is also present in Pinophyta species such as the yellow cypress (''Callitropsis nootkatensis''). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Fisetin」の詳細全文を読む スポンサード リンク
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