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Betulin
|Section2= }} Betulin (lup-20(29)-ene-3β,28-diol) is an abundant, naturally occurring triterpene. It is commonly isolated from the bark of birch trees where it forms up to 30% of the dry weight of the extractive 〔.〕 and is found in birch sap as well.〔http://www2.publicationsduquebec.gouv.qc.ca/essences/arbre.php?id=98〕 The purpose of the compound in the bark is not known. It can be converted to betulinic acid (the alcohol group replaced by a carboxylic acid group), which is biologically more active than betulin itself. ==History== Betulin was discovered in 1788 by German-Russian chemist Johann Tobias Lowitz.
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「Betulin」の詳細全文を読む
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