method for the preparation of a control, suitable for use in the determination of alkaline phosphatase and procedure for lyophilization of serum.

摘要

The activity of alkaline phosphatase in aqueous solution, especially in reconstituted serum, is kept constant by adding to the phosphatase-containing solution Mn2+ or Cd2+ ions, preferably to an end concentration of 0.05 to 0.5 mMol/liter of Mn2+ or 0.05 to 0.1 mMol/liter of Cd2+. Control serums comprising the Mn2+ and/or Cd2+ ions in human or animal serum or serum-like compositions are also provided.