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• W2000375533 abstract "Glucuronide and sulphate conjugates of 2,5,7,8-tetramethyl-2-(2'-carboxyethyl)-6-hydroxychroman (alpha-CEHC), the major metabolite of alpha-tocopherol (vitamin E), have been synthesized and used for the first direct analysis of conjugated urinary vitamin E metabolites. The metabolites of vitamin E (alpha-tocopherol) could be useful as markers of the function(s) of vitamin E in vivo. A number of methods have been described for the analysis of urinary vitamin E metabolites but these have relied on either acid or enzymatic deconjugation of the metabolites prior to analysis by high performance liquid chromatography or gas chromatography/mass spectrometry. These methods have provided useful information about the amount and types of metabolites excreted in the urine but suffer from a number of disadvantages. Deconjugation has been shown to produce artifacts as a result of the conversion of alpha-CEHC to alpha-tocopheronolactone and the efficiency of deconjugation is also difficult to assess. Methods that allow the direct measurement of the conjugated metabolites would overcome these problems and would also substantially reduce the preparation and analysis time. Here we describe the use of conjugated standards to characterize alpha-CEHC conjugates in human urine by tandem mass spectrometry (MS-MS). The future use of MS-MS to measure urinary vitamin E metabolites is also discussed." @default.
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• W2000375533 date "2002-09-01" @default.
• W2000375533 modified "2023-10-14" @default.
• W2000375533 title "Synthesis and analysis of conjugates of the major vitamin E metabolite, α-CEHC" @default.
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• W2000375533 doi "https://doi.org/10.1016/s0891-5849(02)00974-7" @default.
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