Latest App Notes & Case Studies

Reliable assessment of changes in target protein levels by western blot requires measurement of both the target and loading control proteins in the linear dynamic range. Stain-free technology is a novel method introduced by Bio-Rad to visualize and quantify proteins in gels and blots.

Western blotting is a very useful and widely adopted lab technique, but the traditional procedure can be long and tedious. Researchers can assess only whether a blot image is captured at the end of the long procedure and the quality of western blot data is sometimes challenged due to poor loading controls.

Traditional western blot workflows require an appropriate sample load to detect both target proteins and loading control proteins. The discrepancy between these quantities often leads to oversaturated protein bands, forcing researchers to sometimes run two duplicate gels or titrate down the antibody concentration in order to get quantitative results.

Reliable western blot data can be generated only when the proper sample amount of protein is used. Loading too much protein leads to signal saturation in western blots, yet too little produces weak signals.

Reliable western blot data require detection of the target and loading control proteins in the linear dynamic range. Many published western blot images show saturated protein bands, indicating that they were not measured in the linear dynamic range. Quantitative analysis based on this type of data is not reliable.

Several challenges have surfaced during clinical evaluation of biological drug products due to a commonly associated immune response in patients. Anti-drug antibodies (ADA) are known to be frequently generated during administration of humanized monoclonal antibody therapeutics. A commonly used technology platform for assessment of immunogenicity relies on the bridging immunogenicity assay format typical of the ELISA.

Characterising the state of aggregation in proteins is of paramount importance when trying to understand biopharmaceutical product stability and efficacy. Product quality, both in terms of biological activity and immunogenicity can be highly influenced by the state of protein aggregation.

This study describes a novel, target-specific, cell-based assay platform that can be used to detect and differentiate potential inhibitors of Epidermal Growth Factor receptors.

Accurate measurement of the concentration of a biological product is important in bioreactor/fermenter monitoring, downstream processing and final product quality control. Currently, electrophoretic, chromatographic and immunochemical methods are the most commonly used. These three methods are currently used in combination to provide the desired sample information.

The Threshold® Immuno-Ligand Assay (ILA) adapts reagents used in ELISA, RIA or radioreceptor assays for the Threshold System by covalently attaching biotin or fluorescein labels to the binding proteins and/or ligands. To simplify labeling and purification of proteins, Molecular Devices has formulated biotin and fluorescein as N-hydroxysuccinimide esters.