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• W1988810299 abstract "Quinolinic, picolinic, and nicotinic acids and nicotinamide are end products of the kynurenine pathway from l-tryptophan and are intermediates in the biosynthesis of nicotinamide adenine dinucleotide. These compounds are involved in complex interrelationships with inflammatory and apoptotic responses associated with neuronal cell damage and death in the central nervous system. To facilitate the study of these compounds, we have utilized gas chromatography-mass spectrometry in electron capture negative ionization mode for their concurrent trace quantification in a single sample. Deuterium-labeled quinolinic, picolinic, and nicotinic acids were used as internal standards and the compounds were converted to their hexafluoroisopropyl esters prior to chromatography. Nicotinamide was readily quantified after conversion to nicotinic acid using gas-phase hydrolysis-a process which did not affect the deuterated internal standards. The on-column limit of quantification was less than 1 fmol for each of the analytes and calibration curves were linear. A packed column liner was used in the gas chromatograph inlet to effectively eliminate sample interference effects in the analysis of trace (femtomolar) levels of quinolinic acid. The method enables rapid and specific concurrent quantification of quinolinic, picolinic, and nicotinic acids in tissue extracts and physiological and culture media." @default.
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• W1988810299 date "2002-02-01" @default.
• W1988810299 modified "2023-09-26" @default.
• W1988810299 title "Concurrent Quantification of Quinolinic, Picolinic, and Nicotinic Acids Using Electron-Capture Negative-Ion Gas Chromatography–Mass Spectrometry" @default.
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• W1988810299 doi "https://doi.org/10.1006/abio.2001.5490" @default.
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