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LC-MS peptide mapping is the most commonly used method to analyze protein modifications. The proteins are generally digested using trypsin at a slightly basic pH at 37 °C from several hours to overnight. Assay-induced artifacts can be generated during this procedure, potentially causing false-positive or false-negative results for a given modification. Unfortunately, for the analysis of succinimide,...
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′)...
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