Misskiwi67
Posted : 2/2/2007 6:35:16 PM
ORIGINAL: Cally01
Actually Misskiwi67 the mixed tocopherols is more than one component of Vitamin E...the mixed means it contains not only the d-alpha, but gamma's and delta components as well...which makes it complete as it contains all the components....not just one[
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Your book says the multiple forms make a complex? Like they all work together somehow?? I've never heard of such a thing, either that or I'm misunderstanding you. This is what I know about vitamin E. alpha-tocopherol is vitamin E, or what becomes vitamin E. Its the one used by the body. Excess vitamin E (there is limited serum binding) is converted and excreted by the kidney, along with ALL the other tocopherols. Gamma-tocopherol might have other uses, but its mechanisms are unknown. There is also limited absorbtion by the intestine, so much of the excess vitamin E remains in the feces as well.
So basically, like I said already, the rest is just waste. You pee it out, just like all the rest of the excesses. They say its vitamin E, but its not. How many foods add extra vitamin E along with the mixed tocopherols?
Vitamin E: function and metabolism. [linkBrigelius-Flohe>http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Search&itool=pubmed_AbstractPlus&term=%22Brigelius%2DFlohe+R%22%5BAuthor%5D]Brigelius-Flohe R[/link],
[linkTraber>http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Search&itool=pubmed_AbstractPlus&term=%22Traber+MG%22%5BAuthor%5D]Traber MG[/link]. German Institute of Human Nutrition, Bergholz-Rehbrucke, Germany Department of Nutrition and Food Management, Linus Pauling Institute, Oregon State University, Corvallis, Oregon 97330, USA. Flohe.www.dife.de Although vitamin E has been known as an essential nutrient for reproduction since 1922, we are far from understanding the mechanisms of its physiological functions. Vitamin E is the term for a group of tocopherols and tocotrienols, of which alpha-tocopherol has the highest biological activity. Due to the potent antioxidant properties of tocopherols, the impact of alpha-tocopherol in the prevention of chronic diseases believed to be associated with oxidative stress has often been studied, and beneficial effects have been demonstrated. Recent observations that the alpha-tocopherol transfer protein in the liver specifically sorts out RRR-alpha-tocopherol from all incoming tocopherols for incorporation into plasma lipoproteins, and that alpha-tocopherol has signaling functions in vascular smooth muscle cells that cannot be exerted by other forms of tocopherol with similar antioxidative properties, have raised interest in the roles of vitamin E beyond its antioxidative function. Also, gamma-tocopherol might have functions apart from being an antioxidant. It is a nucleophile able to trap electrophilic mutagens in lipophilic compartments and generates a metabolite that facilitates natriuresis. The metabolism of vitamin E is equally unclear. Excess alpha-tocopherol is converted into alpha-CEHC and excreted in the urine. Other tocopherols, like gamma- and delta-tocopherol, are almost quantitatively degraded and excreted in the urine as the corresponding CEHCs. All rac alpha-tocopherol compared to RRR-alpha-tocopherol is preferentially degraded to alpha-CEHC. Thus, there must be a specific, molecular role of RRR-alpha-tocopherol that is regulated by a system that sorts, distributes, and degrades the different forms of vitamin E, but has not yet been identified. In this article we try to summarize current knowledge on the function of vitamin E, with emphasis on its antioxidant vs. other properties, the preference of the organism for RRR-alpha-tocopherol, and its metabolism to CEHCs.