This chapter in the Encyclopedia of Analytical Science focuses on analytical detection methods for measuring neurotransmitters in vivo. The discussion begins by outlining the challenges of in vivo neurotransmitter analysis. Then, microdialysis, an in vivo sampling method, is critically described. Subsequently, three methods of direct detection of neurotransmitters are presented in terms of their advantages and disadvantages. Finally, future directions of monitoring brain chemistry are prospectively explored.
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