Profiling of a wide range of neurochemicals in human urine by very-high-performance liquid chromatography-tandem mass spectrometry combined with in situ selective derivatization

Title
Profiling of a wide range of neurochemicals in human urine by very-high-performance liquid chromatography-tandem mass spectrometry combined with in situ selective derivatization
Authors
정봉철Wonwoong LeeNa Hyun ParkTae-Bum AhnJongki Hong
Keywords
neurochemicals; human urine; in situ selective derivatization; LC-MS/MS-MRM; profling analysis; Parkinson's disease
Issue Date
2017-12
Publisher
Journal of chromatography A
Citation
VOL 1526-57
Abstract
Development of a reliable analytical method of neurochemicals in biological fluids is important to discover potential biomarkers for the diagnosis, treatment and prognosis of neurological disorders. However, neurochemical profiling of biological samples is challenging because of highly different polarities between basic and acidic neurochemicals, low physiological levels, and high matrix interference in biological samples. In this study, an ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) method combined with in situ selective derivatization for comprehensive profiling of 20 neurochemicals in urine was developed for a wide range of neurochemicals. In situ selective derivatization greatly improved the peak capacity on a reversed-phase C18 column and sensitive mass detection in LC-ESI-MS/MS-positive ion mode due to reduction of the distinct physicochemical properties between acidic and basic neurochemicals. The MS/MS spectra of neurochemicals exhibited specific ions, such as losses of amine, methanol, or methyl formate molecules from protonated molecules, enabling selection of appropriate multiple reaction monitoring (MRM) ions for selective and sensitive detection. The developed method was validated in terms of linearity, limit of detection (LOD) and limit of quantification (LOQ), precision, accuracy, and recovery. The correlation coefficients (R2) of calibration curves were above 0.9961. The ranges of LODs and LOQs were 0.1– 3.6 ng/mL and 0.3– 12.0 ng/mL, respectively. The overall precision and accuracy were 0.52– 16.74% and 82.26– 118.17%, respectively. The method was successfully applied to simultaneously profile the metabolic pathways of tyrosine, tryptophan, and glutamate in Parkinson’s disease patient urine (PD, n = 21) and control urine (n = 10). Significant differences (P ≤ 0.01) between two groups in the activity of phenylethanolamine N-methyltransferase (PNM
URI
http://pubs.kist.re.kr/handle/201004/66902
ISSN
0021-9673
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KIST Publication > Article
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