Molecular mass is the most fundamental characteristics for proteins and peptides. It directly reflects the structural integrity of proteins, and hence it is commonly applied in identification of proteins and peptides. To better assist the scientific research of our clients, reserchers have developed methods to calculate protein molecular weight based on Bruker ultrafleXtreme™ MALDI TOF/TOF, and high-resolution protein mass measurement service via nano LC-MS. This service can be applied to accurately analyze the molecular mass, subunits, and dimerization/polymerization of multiple biotechnological molecules, including proteins, peptides, antibodies, and vaccines, etc.