Characterization of the stability of a fully human monoclonal IgG after prolonged incubation at elevated temperature

Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Hongcheng LiuJoanne Sun

Abstract

The susceptible degradation sites of therapeutic proteins are routinely assessed under accelerated conditions such as exposure to chemicals or incubation at elevated temperature or a combination of both. A fully human monoclonal IgG(1) antibody was characterized after incubation at 40 degrees C for 6 months by employing mass spectrometry and chromatography analyses. It was found that deamidation, fragmentation and N-terminal glutamate cyclization to form pyroglutamate are the major degradation pathways. Three major deamidation sites were identified and one site in a small tryptic peptide accounted for more than 80% of the total. Peptide cleavage was observed at several positions between different pairs of amino acids. Most of the cleavage sites were located in the hinge or other flexible regions of the IgG molecule.

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Citations

May 14, 2008·Pharmaceutical Research·Georgeen Gaza-Bulseco, Hongcheng Liu
Feb 10, 2010·Pharmaceutical Research·Mark Cornell ManningDerrick S Katayama
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