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- W2024322034 abstract "Resins containing immobilized Staphylococcal Protein A (PA) are widely used in the commercial purification of recombinant human monoclonal antibody (rhuMAb IgG) biotherapeutics. Therefore, a sensitive assay for leached PA is needed to ensure that PA is not present at unacceptable levels as an impurity in the final product. PA impurities are measured by an ELISA using chicken anti-PA antibodies. However, PA in the presence of IgG product forms a PA/IgG complex that interferes in the assay. In this report a multi-product PA ELISA is described, wherein the PA/IgG complex is dissociated by heating in the presence of detergents and chelators prior to the ELISA. The dissociation facilitates the accessibility of the anti-PA antibodies to bind to PA in the immunoassay. Heat is provided by a novel microwave technology which allows brief heating time and high sample throughput using a microtiter plate for sample heating. Thus, broadly applicable dissociation conditions, suitable for all 21 rhMab IgGs tested to date were identified. This approach streamlines the measurement of leached PA, allows higher sample testing throughput, facilitates application across multiple products, and facilitates assay automation. Data comparing in-process samples tested with both the former product-specific ELISA and this new multi-product assay are shown." @default.
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- W2024322034 date "2009-02-01" @default.
- W2024322034 modified "2023-10-03" @default.
- W2024322034 title "Trace level analysis of leached Protein A in bioprocess samples without interference from the large excess of rhMAb IgG" @default.
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- W2024322034 doi "https://doi.org/10.1016/j.jim.2008.10.015" @default.
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