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|Section2= |Section3= }} Castalagin is an ellagitannin, a type of hydrolyzable tannin, found in oak and chestnut wood and in the stem barks of ''Anogeissus leiocarpus'' and ''Terminalia avicennoides''. Castalagin is the (33beta)-isomer of vescalagin. During aging of alcohols in oak barrels, vescalagin can be extracted from the wood and can subsequently be transformed into new derivatives by chemical reactions. Vescalagin is one of the most abundant ellagitannins extracted from oak wood using white wine. == Derivatives == The flavono-ellagitannin known as acutissimin A is created when the oak tannin vescalagin interacts with a flavonoid in wine. 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「Castalagin」の詳細全文を読む スポンサード リンク
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