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Capillary hydrophilic interaction chromatography/mass spectrometry for simultaneous determination of multiple neurotransmitters in primate cerebral cortex
Author(s) -
Zhang Xiaozhe,
Rauch Alexander,
Lee Han,
Xiao Hongbin,
Rainer Gregor,
Logothetis Nikos K.
Publication year - 2007
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.3251
Subject(s) - chemistry , acetylcholine , microdialysis , hydrophilic interaction chromatography , dopamine , glutamate receptor , serotonin , chromatography , neurotransmitter , prefrontal cortex , mass spectrometry , high performance liquid chromatography , neuroscience , extracellular , biochemistry , pharmacology , psychology , medicine , receptor , cognition
A diverse array of neurotransmitters and neuromodulators control and affect brain function. A profound understanding of the signaling pathways and the neural circuits underlying behavior is therefore likely to require the tracking of concentration changes of active neurochemicals. In the present study, we demonstrate the feasibility of a method allowing the simultaneous determination of the concentrations of six neurotransmitters: acetylcholine, serotonin, dopamine, γ ‐aminobutyric acid (GABA), glutamate and aspartate, in the extracellular brain fluid (EBF). We used hydrophilic interaction chromatography (HILIC) coupled to tandem mass spectrometry (MS/MS) to analyze the EBF from the monkey brain. A push‐pull sampling method was used to collect EBF from the prefrontal cortex (PFC) of conscious monkeys at flow rates in the range of low nL/min. The detection limits of acetylcholine, serotonin, dopamine, GABA, glutamate and aspartate were 0.015, 0.15, 0.3, 1.2, 6 and 15 femtomoles, respectively, allowing us to quantitatively determine the concentrations of these six neurotransmitters simultaneously from 500 nL in vivo samples. We conclude that HILIC/MS/MS combined with the push‐pull sampling method represents a sensitive technique for simultaneous monitoring of neurotransmitters from EBF samples. Copyright © 2007 John Wiley & Sons, Ltd.