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• W1848235969 startingPage "1527S" @default.
• W1848235969 abstract "Previously, the metabolism of alpha-tocopherol was considered to involve the opening of the chroman structure because of its oxidation to tocopherylquinone. In contrast, we describe here 2,5,7,8-tetramethyl-2(2’-carboxyethyl)-6-hydroxychroman (alpha-CEHC) as the major urinary metabolite of alpha-tocopherol that appears in human urine after vitamin E supplementation. It is formed directly from alpha-tocopherol without previous oxidative splitting of the chroman ring. The correlation of alpha-tocopherol intake, plasma alpha-tocopherol concentrations, and urinary excretion of alpha-CEHC in human volunteers supplemented with RRR-alpha-tocopherol dosages ranging from 0 to 800 mg/d was examined. HPLC and gas chromatography-mass spectroscopy analysis revealed that alpha-CEHC was only excreted when a plasma threshold of 7-9 mumol alpha-tocopherol/g total lipid was exceeded. This concentration was obtained by a daily intake of approximately 50-150 mg alpha-tocopherol. We suggest that alpha-CEHC excretion indicates a saturated binding capacity of vitamin E in the plasma and thus may be considered to be a marker of optimum vitamin E intake." @default.
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• W1848235969 date "1995-12-01" @default.
• W1848235969 modified "2023-10-16" @default.
• W1848235969 title "Novel urinary metabolite of alpha-tocopherol, 2,5,7,8-tetramethyl-2(2’-carboxyethyl)-6-hydroxychroman, as an indicator of an adequate vitamin E supply?" @default.
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• W1848235969 doi "https://doi.org/10.1093/ajcn/62.6.1527s" @default.
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