![]() All isolated materials had similar potency and rat FcRn binding relative to the starting material. Detailed analyses were performed on the isolated fractions to identify specific chemical modification contributing to the charge differences and were also characterized for purity and in vitro potency prior to being administered either subcutaneously (SC) or intravenously (IV) in rats. ![]() Cation exchange displacement chromatography was used to isolate the acidic, basic and main peak fractions for animal studies. The mAb starting material had a p I range of 8.7–9.1 and was composed of about 20% acidic variants, 12% basic variants and 68% main peak. To gain further insights into the impact on biological activity and pharmacokinetics (PK) of monoclonal antibody (mAb) charge heterogeneity, we isolated the major charge forms of a recombinant humanized IgG1 and compared their in vitro properties and in vivo PK. Subtle differences in the relative proportions of charge variants are often observed during routine biomanufacture or process changes and pose a challenge to demonstrating product comparability. ![]() Antibody charge variants have gained considerable attention in the biotechnology industry due to their potential influence on stability and biological activity. ![]()
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