METABOLIC PROFILING WITH MAGNETIC RESONANCE MASS SPECTROMETRY (MRMS)
申请人:Oregon Institute of Science and Medicine
公开号:US20190391092A1
公开(公告)日:2019-12-26
A method for constructing a metabolic profile of a mammalian (such as a human) subject from one of more urine samples from the subject uses magnetic resonance mass spectrometry (MRMS) for the rapid and inexpensive quantitative measurement of at least 4,000 urinary chemical substances in a single analysis. The method for metabolic profiling measures thousands of urinary substances in a urine sample from a mammalian subject in a single assay. Many of these substances can be of mammalian metabolic origin. The measurements of types and amounts of urinary substances can be correlated to assessments of present or future health of the subject.
Discovery of Dopamine Glucuronide in Rat and Mouse Brain Microdialysis Samples Using Liquid Chromatography Tandem Mass Spectrometry
作者:Päivi Uutela、Laura Karhu、Petteri Piepponen、Mikko Käenmäki、Raimo A. Ketola、Risto Kostiainen
DOI:10.1021/ac801846w
日期:2009.1.1
A liquid chromatographic−electrospray/tandem mass spectrometric (LC−ESI-MS/MS) method was developed for the analysis of dopamine and its phase I and phase II metabolites from brain microdialysis samples. The method provides for the first time the analysis of intact dopamine glucuronide and sulfate without hydrolysis. The paper describes also an enzymatic synthesis method using rat liver microsomes as biocatalysts and characterization of dopamine glucuronide as a reference compound. The method was validated for quantitative analysis by determining limits of detection and quantitation, linearity, repeatability, and specificity. Dopamine glucuronide was found for the first time in rat and mouse brain microdialysis samples. The concentrations of dopamine and its glucuronide in the microdialysates collected from the striatum of rat brains were approximately equal (2 nM). Dopamine sulfate was not detected in the microdialysates (limit of detection 0.8 nM). The main metabolites of dopamine were dihydroxyphenylacetic acid (DOPAC, 1200 nM) and homovanillic acid (HVA, 700 nM).