Procedure
To each of the two flasks containing the
Assay preparation and the
Standard preparation, respectively, and to a similar flask containing 20.0 mL of alcohol to provide the blank, add 2.0 mL of a solution prepared by dissolving 50 mg of blue tetrazolium in 10 mL of alcohol, and mix. Then to each flask add 4.0 mL of a 1 in 10 solution of
tetramethylammonium hydroxide TS in alcohol, mix, allow to stand in the dark for 90 minutes, add 1.0 mL of glacial acetic acid, mix, and proceed as directed for
Procedure under
Assay for Steroids 351, beginning with Concomitantly determine the absorbances. Calculate the quantity, in mg, of C
25H
33NaO
8 in the Hydrocortisone Sodium Succinate taken by the formula:
8.38C(AU / AS).