This study developed a method for the determination of 37 amino acids in serum using liquid chromatography-tandem mass spectrometry(LC-MS/MS). Serum sample was treated with 10% sulfosalicylic acid to achieve protein precipitation. The sepernatant was chromatographically separated using a Phenomenex Kinetex F5(250 mm×4.6 mm,5 μm) column with a gradient elution consisting of 0.02% formic acid-acetonitrile,and detected under electrospray ion source positive ion(ESI) and multiple reaction monitoring(MRM) mode. The results showed that the developed method exhibited good sensitivity and linearity for the selected 37 amino acids within the concentration range from the limit of detection to 1 000 ng/mL,with correlation coefficients exceeding 0.999. The retention time for individual amino acid was ranged from 4.60-9.16 min,while the limits of detection and limits of quantification was in the ranges of 0.2-10.0 ng/mL and 0.5-20.0 ng/mL,respectively. The recoveries across different spiked levels were 83.2%-118%,and the relative standard deviations varied between 0.90%-9.4%. The method was applied to quantify 37 amino acids in 49 serum samples. The results indicated that,with the exception of anserine and cystathionine,which were not detected,and homocysteine,which had a detection rate of 10.20%,the detection rates of the other 34 amino acids were greater than 90%. This method demonstrates good detection performance and can be used for the determination of amino acid in serum samples,providing more comprehensive data for diseases related to amino acid metabolism disorders.
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