a modified hplc method is described for the determination of amino acids [ aspartic acid , glutamic acid , glutamine , glycine , taurine , and gamma-aminobutyric acid ( gaba ) ] in brain tissue utilizing precolumn derivatization with o-phthalaldehyde ( opa ) -tert-butyl-thiol and electrochemical detection .
C0061472
glutamic acid
C0017797
glutamine