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Quantitation of soluble aggregates in recombinant monoclonal antibody cell culture by pH-gradient protein A chromatography.
Analytical Biochemistry 2009 May 16
Monoclonal antibodies (mAbs) produced from mammalian cell culture may contain significant amounts of dimers and higher order aggregates. Quantitation of soluble aggregates in the cell culture is time-consuming and labor-intensive, usually involving a purification step to remove the impurities that interfere with the subsequent size exclusion chromatography (SEC) analysis. We have developed a novel pH-gradient protein A chromatography for rapid, non-size based separation of the aggregates in mAb cell culture samples. Our results demonstrate that this method has excellent correlation with SEC and can be applied to both human immunoglobulin gamma 1 (IgG1) and IgG2 antibodies. This approach can be useful in the quantitation of soluble aggregates in crude cell culture samples.
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