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首页> 外文会议>Proceedings of the 12th International Rapeseed Congress: Abstracts >Tocopherols, tocotrienols and a new radical scavenging substance in raw and processed rapeseed and rapeseed oil
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Tocopherols, tocotrienols and a new radical scavenging substance in raw and processed rapeseed and rapeseed oil

机译：菜籽油和菜籽油及菜籽油中的生育酚，生育三烯酚和新型自由基清除物质

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The content oftocopherols (alpha, gamma, delta), alpha-tocotrienol and plastochromanol-8 was determined both in raw and processed rapeseed as well as in different rapeseed oils after saponification and hexane extraction by normal-phase liquid chromatography using fluorescence detection. The results show that gamma-tocopherol represented 54% and alpha-tocopherol 32% of the total tocopherols. The content of plastochromanol-8 accounted to 12% of the total tocopherols. The alpha-tocotrienol content was below 1%, which was separated with a high resolution. Applying a modified method of tocopherol analysis by decreasing the isopropanol fraction in the solvent a strong phenolic antioxidant was found in the crude rapeseed oil. The compound was identified as 4-vinylsyringol also referred to as canolol, a decarboxylation product of sinapinic acid. For the structural identification 4-vinylsyringol was isolated from crude rapeseed oil. 4-Vinylsyringol was chemically synthesized and compared with the natural compound. 4-Vinylsyringol was detected in cold pressed oil and in roasted rapeseed but not in fully refined oils. Interestingly, the 4-vinylsyringol content increased after roasting the rapeseed.
机译：皂化和正己烷萃取后，通过正相液相色谱（使用荧光检测法）测定生菜油和加工菜籽以及不同菜籽油中的生育酚（α，γ，δ），α-生育三烯酚和质子铬醇8的含量。结果表明，γ-生育酚占总生育酚的54％，α-生育酚占总生育酚的32％。 plastchromchromanol-8的含量占生育酚总量的12％。 α-生育三烯酚含量低于1％，可以高分辨率分离。通过减少溶剂中异丙醇的含量，应用一种改进的生育酚分析方法，在菜籽油中发现了一种强大的酚类抗氧化剂。该化合物被鉴定为4-乙烯基丁香酚，也称为卡诺洛尔，其为芥子酸的脱羧产物。为了进行结构鉴定，从粗菜籽油中分离了4-乙烯基丁香酚。化学合成了4-乙烯基丁香酚，并与天然化合物进行了比较。在冷榨油和烤菜籽中检出4-乙烯基丁香酚，但在完全精制的油中未检出。有趣的是，烘烤油菜籽后4-乙烯基丁香酚含量增加。

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