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Electrospray-differential mobility analysis as an orthogonal tool to size-exclusion chromatography for characterization of protein aggregates.

Journal of pharmaceutical sciences (2012-03-14)
Suvajyoti Guha, Joshua R Wayment, Michael J Tarlov, Michael R Zachariah
ABSTRACT

The biopharmaceutical industry characterizes and quantifies aggregation of protein therapeutics using multiple analytical techniques to cross-validate results. Here, we demonstrate the use of electrospray-differential mobility analysis (ES-DMA), a gas-phase and atmospheric pressure ion-mobility method for characterizing protein aggregates. Two immunoglobulin Gs are systematically heat treated to induce aggregation and characterized using size-exclusion chromatography (SEC) and ES-DMA. Although ES-DMA is a gas-phase characterization method, we find that aggregation kinetic rate constants determined by ES-DMA is in good agreement with those determined by SEC. ES-DMA appears to have a higher resolution and lower limit of detection as compared with SEC. Thus, ES-DMA can potentially become an important orthogonal tool for characterization of nascent protein aggregates in the biopharmaceutical industry.

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Product Description

Sigma-Aldrich
IgG from human serum, reagent grade, ≥95% (SDS-PAGE), essentially salt-free, lyophilized powder