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An efficient strategy to characterize recombinant monoclonal antibody charge variants was established using weak anion exchange chromatography, LC-MS and IdeS digestion to allow subunit level characterization. Significantly higher resolution was achieved at subunit levels by weak anion exchange chromatography and LC-MS. In addition, subunit analysis localized potential modifications to either F(ab′)...
Recombinant monoclonal antibodies are commonly expressed in mammalian cell culture and purified by several steps of filtration and chromatography. The resulting high purity bulk drug substance still contains product variants differing in properties such as charge and size. Posttranslational modifications and degradations occurring during cell culture are the major sources of heterogeneity in bulk...
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