Bioanalysis Zone

Advanced characterization of antibody-drug conjugates by LC-MS (Waters Corporation)

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Antibody-drug conjugates (ADCs) are a complex the amalgamation of monoclonal antibodies (mAb) and low-molecular-weight toxins. The combination is often a mAb targeted to cancer, delivering a potent cyotoxin to a specific site or cell. The resulting conjugate is complex and typically heterogeneous, making physical chemical characterization challenging. Liquid chromatography coupled with mass spectrometry (LC-MS), and combined with purposefully designed informatics, are powerful tools for the characterization of proteins including mAbs. At Waters we have placed a focus on LC-MS for ADCs based on cysteine, lysine, and engineered conjugates. An ADC-specific LC-MS characterization workflow is illustrated for intact, sub-unit, and peptide levels.

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By John Gebler Waters Coporation

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