METHOD OF QUANTIFYING SURFACTANT

摘要

A method of quantifying an ethylene oxide based nonionic surfactant in a sample containing a physiologically active protein, which comprises adding an aqueous organic solvent to the sample containing a physiologically active protein, thereby forming a precipitate of the physiologically active protein, removing the precipitate and adding an ammonium thiocyanate/cobalt nitrate reagent (CoSCN reagent) to the sample cleared of said precipitate.