RESUMEN
Objective To establish a method for the determination of 17 kinds of free amino acid in serum by the ultra perform-ance liquid chromatography(UPLC) with AQC pre-column derivatization .Methods After proteins precipitation in serum sample by acetonitrile ,free amino acids with aminoquinoline-N-butyl hydroxy diimide and carbamate(AQC) were reacted to generate the struc-tural stable derivative products with ultraviolet absorption .These products were separated by reversed-phase C18 column ,detected with UV detector and quantitated by the external standard .Results The within-run precision of 17 kinds of free amino acid was 2 . 81% -7 .35% and the between-run precision was 7 .44% -15 .40% .The linear relationship was good in the range of 2 .5-250μmol/L ,the linear correlation coefficient was 0 .9960 -1 .0000 ,RSD<3% .Conclusion Using this method for determining 17 kinds of amino acid in serum ,the complete separation is obtained within 10 min ,the results are accurate ,stable and highly efficient .