Shimadzu’s new nSMOL Antibody BA reagent kit offers a unique and standardized workflow for the quantitation of monoclonal antibody drugs by LC-MS/MS in blood or other biological samples. The technique, called nano-Surface and Molecular-Orientation Limited (nSMOL) proteolysis, has been designed to minimize sample complexity while maintaining the specificity of the protein substrate for LC–MS/MS quantitation in therapeutic drug monitoring of mAbs. nSMOL proteolysis is an entirely novel solid-solid proteolysis method engineered to deliver highly efficient and quantitative detection of CDR peptides while decreasing the peptide numbers of the analytical target without antibody denaturation.