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- W2010064014 abstract "A comparison study on folate quantitation was carried out between the recently developed stable isotope dilution assay using liquid chromatography-tandem mass spectrometry (LC-MS-MS) and the frequently used HPLC with fluorimetric detection (LC-FD). By applying LC-MS-MS, spinach, wheat bread, beef, and blood plasma were found to contain 159.2, 19.8, 1.2, and 5.6 microg/100 g total folates, respectively, whereas the respective quantitative data obtained by LC-FD were 95.5, 16.2, 0.7, and 6.8 microg/100 g. In all samples, LC-MS-MS revealed superior selectivity and precision and circumvented the shortcomings of conventional LC techniques, i.e., ambiguous peak assignment as well as high detection limits for 5-formyltetrahydrofolate, 10-formylfolic acid, and folic acid. The affinity chromatography columns used in this study showed excellent cleanup performance and permitted detection limits as low as 0.1, 0.5, 0.1, 0.08, and 0.1 microg/100 g for tetrahydrofolate (H(4)folate), 5-methyl-H(4)folate, 5-formyl-H(4)folate, 10-formylfolate, and pteroylglutamic acid, respectively. Thus, a 10-fold higher sensitivity compared to solid-phase anion-exchange cartridges was achieved. However, affinity chromatography columns revealed a significantly higher affinity toward the natural vitamers than to the racemic isotopomeric standards, which has to be considered when applying the latter in stable isotope dilution assays." @default.
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- W2010064014 date "2003-04-01" @default.
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- W2010064014 title "Comparison of folate quantification in foods by high-performance liquid chromatography–fluorescence detection to that by stable isotope dilution assays using high-performance liquid chromatography–tandem mass spectrometry" @default.
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- W2010064014 doi "https://doi.org/10.1016/s0003-2697(03)00029-0" @default.
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