RESUMO
BACKGROUND: There is a need for general and reliable LC-MS assays capable of supporting the bioanalysis of a variety of human monoclonal antibody-based therapeutic drug candidates in animal PK/TK studies. RESULTS: We present herein improvements in our previously reported universal peptide approach to the bioanalysis of human monoclonal antibody protein drug candidates in animal studies. These improvements include incorporation of a second, light chain-based universal peptide into the assay, thus introducing the concept of a dual universal peptide assay; and incorporation of a universal stable isotope-labeled monoclonal antibody into the assay. CONCLUSION: Improvements reported herein to the universal peptide assay will enable more reliable quantification of human monoclonal antibody protein drug candidates in animal studies.