Objective\ To study the application of high performance electrophoresis capillary method for determination of six amino acids in serum of cerebral palsy infant.\ Methods\ A rapid method for the determination of free amino acids in serum was developed.\ The assay is based on precolumn derivation of amino acids with 2,4\|dinitrofluorobenzene, separation of the derivatives by capillary zone electrophoresis.\ Results\ The linear range of six free amino acids was 5~500 μmol/L, and the relative standard deviation...