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Determination of amino acid neurotransmitters in mouse brain tissue using high-performance liquid chromatography with fluorescence detection

Mengmeng Wang, Wangchun Du, Jie Shen*, Yi Dong, Wenshi Wei, Zhongjuan Song   

  1. 1. Department of Pharmacy, Huadong Hospital Affiliated to Fudan University, Shanghai 200040, China
    2. Department of Medicine, Shanghai Institute of Health Sciences, Shanghai 201318, China
    3. State Key Laboratory of Medical Neurobiology, Shanghai Medical College and Institutes of Brain Science, Fudan University, Shanghai 200032, China
    4. Department of Neurology, Huadong Hospital Affiliated to Fudan University, Shanghai 200040, China
  • Received:2012-11-02 Revised:2013-03-05 Online:2013-05-08 Published:2013-05-08
  • Contact: Jie Shen*

Abstract:

Amino acid neurotransmitters facilitate the transmission of nerve messages across the synapses and play essential roles in the control and regulation of a variety of functions in the central and peripheral nervous system. In this study, we developed a sensitive and efficient method using high-performance liquid chromatography (HPLC) with fluorescence detection for the assay of five important amino acid neurotransmitters. After derivatization with ο-phthaldialdehyde (OPA), aspartate (Asp), glutamic acid (Glu), glycine (Gly), taurine (Tau) and γ-aminobutyric acid (GABA) were simultaneously detected in the presence of the internal standard homoserine (Hse). Precise separation of these five amino acids was achieved using isocratic elution within 24 min. Good linearity was found over the concentration range with correlation coefficients (r2) not less than 0.9998. The limit of detection (LOD) values were no more than 10 nmol/L. The intra- and inter-day reproducibility was adequate with the relative standard deviation (RSD) of 10.5% or below. This method has also been applied to the analysis of amino acids in the substantia nigra and striatum samples obtained from C57BL/6 mice.

Key words: HPLC, Fluorescence detection, ο-Phthaldialdehyde, Amino acids

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