Objective: To research a kind of high-performance liquid chromatography (HPLC)-PITC technology in order to detect the level of Asp, Glu, Gly and GABA in infused fluid of hippocampus in tree shrews. Methods: Waters Novapak C18 (300?mm×15?mm); Mobile phases is consisted of A and B. Detecter UV 254?nm. Results: The above amino acids are separated very well and contained at 1.65 min, 4.00?min and 10.35?min respectively. There are significant differences between the ischemic and sham (P<0.01). Conclusion: The me...