Biosynthesis of antioxidant lignans in Sesamum indicum seeds
摘要:
Sesame lignans, whose biosynthetic pathway is the subject of this study, have well-established antioxidant and health protecting properties. Using a combination of radio-and stable-isotopically labelled precursor administration experiments, it was demonstrated that E-coniferyl alcohol undergoes stereoselective coupling to afford (+)-pinoresinol in Sesamum indicum seeds. Only this enantiomer, and not its (-)-antipode, is metabolized further in maturing seeds to afford (+)-piperitol, (+)-sesamin, and (+)-sesamolin. Introduction of the methylene dioxy bridges occurs sequentially with piperitol first being formed, this being subsequently modified to afford sesamin. Copyright (C) 1997 Elsevier Science Ltd. All rights reserved.
Biosynthesis of antioxidant lignans in Sesamum indicum seeds
摘要:
Sesame lignans, whose biosynthetic pathway is the subject of this study, have well-established antioxidant and health protecting properties. Using a combination of radio-and stable-isotopically labelled precursor administration experiments, it was demonstrated that E-coniferyl alcohol undergoes stereoselective coupling to afford (+)-pinoresinol in Sesamum indicum seeds. Only this enantiomer, and not its (-)-antipode, is metabolized further in maturing seeds to afford (+)-piperitol, (+)-sesamin, and (+)-sesamolin. Introduction of the methylene dioxy bridges occurs sequentially with piperitol first being formed, this being subsequently modified to afford sesamin. Copyright (C) 1997 Elsevier Science Ltd. All rights reserved.