Mapping IgG Subunit Glycoforms Using HILIC and a Wide-Pore Amide Stationary Phase

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Matthew A. Lauber and Stephan M. Koza
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Subunit analyses of mAbs represent a useful strategy for rapidly investigating domain specific modifications. The combination of high fidelity IdeS proteolysis with high resolution LC-UV-MS has presented a new approach to mAb identity testing and assaying oxidation. The current subunit mapping strategies have exclusively relied upon reverse phase chromatography. However, since N-linked glycosylation of IgG proteins elicit dramatic changes in hydrophilicity and hydrogen bonding characteristics, a separation by hydrophilic interaction chromatography (HILIC) can be effectively used for this application or as a complementary method to reversed-phase separations since the same mobile phases can be employed. For this reason, we have proposed the use of HILIC with an amide bonded stationary phase that has been optimized for large molecule separations, the wide-pore glycoprotein BEH amide, 300Å, 1.7 μm stationary phases. Along with new developments in released N-glycan analysis afforded by RapiFluor-MS,22 the glycoprotein BEH amide, 300Å, 1.7 μm column enables new possibilities for routine monitoring and detailed characterization of mAb glycosylation, including elucidation of domain-specific glycan information.

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