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• W2321805288 abstract "A dual label stable isotope dilution assay was developed to trace the deconjugation efficiency of polyglutamic folate vitamers converted to their monoglutamic analogues. For this purpose, [13C5]-pteroylheptaglutamate was synthesized and added during extraction of foods as a tracer isotopologue along with [2H4]-5-methyltetrahydrofolate, [2H4]-5-formyltetrahydrofolate, [2H4]-tetrahydrofolate, [2H4]-10-formylfolate, and [2H4]-folic acid. The [2H4]-labeled folates were used as internal standards for the monoglutamates. Deconjugation converted the addition tracer [13C5]-pteroylheptaglutamate to the detection tracer [13C5]-folic acid, which was quantified along with unlabeled folic acid using [2H4]-folic acid as the internal standard. LC-MS/MS enabled the unequivocal differentiation of the three isotopologues. This tracing was used to optimize deconjugation efficiency, which was achieved by using 4-morpholineethanesulfonic acid buffer for extraction at pH 5.0 . The optimized assay revealed limits of detection for the folate vitamers ranging between 2.0 and 5.6 pmol per assay (equivalent to 2.2–6.6 μg/100 g dry mass), recoveries ranging between 98 and 105% and relative standard deviations in inter-assay precision ranging between 2 and 6%. The assay was applied to quantitate folates in spinach, beans, cheeses, bread, wheat germs, and yeast ." @default.
• W2321805288 created "2016-06-24" @default.
• W2321805288 creator A5010539428 @default.
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• W2321805288 date "2012-02-07" @default.
• W2321805288 modified "2023-09-30" @default.
• W2321805288 title "Improved Folate Extraction and Tracing Deconjugation Efficiency by Dual Label Isotope Dilution Assays in Foods" @default.
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• W2321805288 doi "https://doi.org/10.1021/jf203670g" @default.
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