Tocopherols, tocotrienols and a new radical scavenging substance in raw and processed rapeseed and rapeseed oil
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.
rapeseed oil Brassica napus tocopherols tocotrienols plastochromanol-8 4-vinylsyringol canolol
A.Wagner G.Jahreis
Institute of Nutrition, Department of Nutritional Physiology, Friedrich Schiller University, D-07743 Jena, Germany
国际会议
第十二届国际油菜大会( The 12th International Rapeseed Congress)
武汉
英文
1810-1812
2007-03-26（万方平台首次上网日期，不代表论文的发表时间）