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Publications (2)5.46 Total impact

  • Hongcheng Liu · Georgeen Gaza-Bulseco · Edwin Lundell
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    ABSTRACT: Antibody fragmentation in the hinge region and other regions, and the impact of pH on the level and pattern of antibody fragmentation were investigated by reversed-phase (RP) liquid chromatography and mass spectrometry (LC-MS). Extensive fragmentation was observed in the hinge and in regions other than the hinge of a recombinant monoclonal antibody that was incubated in buffers of various pH at 40 degrees C for 10 weeks. Peptide bonds that were susceptible to hydrolysis were located mainly around the domain-domain interfaces close to or in the loop structures. The sites as well as the level of peptide bond hydrolysis were affected by the buffer pH. In agreement with previous findings when only the hinge region fragmentation was monitored, pH 6 was optimal for slowing down antibody fragmentation in regions other than the hinge. It also demonstrated that analysis by RPLC-MS provided a better assessment of the susceptible regions of recombinant monoclonal antibodies than size-exclusion chromatography (SEC) followed by fraction collection and mass spectrometry identification.
    No preview · Article · Jan 2009 · Journal of Chromatography B
  • Tao Xiang · Edwin Lundell · Zuping Sun · Hongcheng Liu
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    ABSTRACT: IgG hinge region peptide bonds are susceptible to degradation by hydrolysis. To study the effect of Fab and Fc on hinge region peptide bond hydrolysis, a recombinant humanized monoclonal IgG1 antibody, its F(ab')2 fragment, and a model peptide with amino acid sequence corresponding to the hinge region were incubated at 40 degrees C in formulation buffer including complete protease inhibitor and EDTA for 0, 2, 4, 6 and 8 weeks. Two major cleavage sites were identified in the hinge region of the intact recombinant humanized monoclonal antibody and its F(ab')2 fragment, but only one major cleavage site of the model peptide was identified. Hinge region peptide bond hydrolysis of the intact antibody and its F(ab')2 fragment degraded at comparable rates, while the model peptide degraded much faster. It was concluded that Fab region of the IgG, but not Fc portion had significant effect on preventing peptide bond cleavage by direct hydrolysis. Hydrolysis of hinge region peptide bonds was accelerated under both acidic and basic conditions.
    No preview · Article · Nov 2007 · Journal of Chromatography B