Effects of elution [correction of eution] conditions on the separation of calpastatin, mu- and m-calpain on DEAE-Sephacel chromatography.

A rapid stepwise measurement for the activities of calpastatin and mu- and m-calpains was developed by using 2-stage elution at pH 8.5 and then 7.0. The activities of calpastatin, mu-calpain and m-calpain can be rapidly assayed following the separation on DEAE-Sephacel chromatography by a 2 stage elution with 90 mM NaCl (pH 8.5), and then by 200 and 300 mM NaCl in elution buffer (pH 7.0). No significant differences in the recovery of these proteinases and inhibitor was observed between stepwise gradient and linear gradient methods.