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A high‐resolution capillary isoelectric focusing method for the determination of therapeutic recombinant monoclonal antibody
Author(s) -
Lin Jun,
Tan Qingqiao,
Wang Shaoxiong
Publication year - 2011
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201100067
Subject(s) - isoelectric focusing , chromatography , chemistry , monoclonal antibody , glycosylation , resolution (logic) , capillary electrophoresis , recombinant dna , antibody , biochemistry , enzyme , artificial intelligence , computer science , gene , immunology , biology
Capillary isoelectric focusing (CIEF) is a common choice for separation and analysis of the charge variants and impurities of therapeutic proteins. In this study, we developed a sensitive CIEF analysis method for determining the charge heterogeneity of therapeutic monoclonal antibody (mAb) using Beckman PA800 plus platform. The mixture of 5% Pharmalyte 8–10.5 and 1% Pharmalyte 3–10 was used to overcome the limitation of using single Pharmalyte 3–10 in detecting charge heterogeneity of basic mAb. This approach largely improved the resolution of the heterogeneous peaks. In addition, 3 M urea and 50 mM arginine (Arg) were used to improve the separation as solubilizer and cathodic stabilizer, respectively. Under optimized condition, both acidic and basic peaks of the mAb were separated well. Method qualification results showed good specificity, precision, and linearity within the concentration range of 0.03–0.20 mg/mL for mAb R1. The method was then used for C‐terminal lysine (Lys) variants characterization and glycosylation profiles analysis. Furthermore, it also had a wide application in the clone screening process. The highly sensitive and repeatable results highlighted the wide application prospects of this method in biopharmaceutical industry.