Mapping Isomeric Peptides Derived from Biopharmaceuticals Using High-Resolution Ion Mobility Mass Spectrometry.

The identification and localization of isomeric peptide modifications is a critical requirement of the biopharmaceutical industry. Despite the ability of liquid chromatography-mass spectrometry to identify many of the common post translational modifications, the identification of isobaric or racemized peptides is confounded by modern mass spectrometry-based techniques. Here, we present a novel approach combining liquid chromatography with a high-resolution ion mobility mass spectrometry system to differentiate peptide and peptide fragments based upon their mobility and mass.