Ken-ichi Mawatari

TL;DR: In this article, a system was developed for the determination of quinolinic acid in human urine using liquid chromatography with fluorimetric detection, where the compound was separated by reversed-phase chromatography using a 35 mM potassium dihydrogen-phosphate solution (adjusted to pH 3.8 with 0.2 M citric acid) containing 350 mM hydrogen peroxide and 0.05 mM tetramethylammonium hydroxide as a mobile phase.

TL;DR: The present method was validated, and sufficient reproducibility and accuracy was obtained for the quantitative measurement of the 23 types of nucleosides and nucleotides in dietary foods and beverages.

TL;DR: In this article, a high performance liquid chromatographic method involving postcolumn ultraviolet (UV) irradiation and fluorometric detection has been developed for the simultaneous determination of nicotinic acid and nicotinamide in human serum.

TL;DR: Strong fluorescence signals were observed after the reaction of novel reagents with hydroperoxides in order to characterize the properties of these reagents and their applications in materials science.

TL;DR: The addition of tetrahydrofuran to the mobile phase led to the peaks showing good separation as well as increased sensitivity, and the calibration graph for isatin was linear over the range of 0.16-10.7 ng.