Integrative assessment of amino acid nitrogen isotopic composition in biological tissue samples determined by GC/C/IRMS, LC x EA/IRMS, and LC x GC/C/IRMS (vol 20, pg 531, 2022)

Summary: Compound-specific isotope analysis of nitrogen in amino acids has made significant contributions to environmental sciences. Although there are different methods for determining the isotope composition, they have not been intercalibrated yet. A systematic comparison of three methods showed consistent results, validating the comparability of CSIA-AA in interdisciplinary research.