We also offer a variant of streptavidin (SA26 Streptavidin-plus), which is made as a recombinant form in E. coli and has a molecular weight of 55 kDa. Streptavidin-plus has been found to have superior performance in certain applications, such as when immobilized as an ELISA capture agent. The specific activity of SA10 is =14.0 U/mg protein, and that of SA26 is =15.0 U/mg protein, when measured by the industry-standard HABA dye-binding assay. The specific activity measurement is higher still when measured by the alternative biotin-titration assay used by some suppliers.
This product is only available to U.S. Domestic Customers.
For research use only, not to be used in diagnostic procedures.