Procedure
Concomitantly determine the absorbances of the
Standard solution and the
Test solution in 1-cm cells, at the wavelength of maximum absorbance at about 252 nm, with a suitable spectrophotometer, using methanol as the blank. Calculate the quantity, in mg, of clomipramine hydrochloride (C
19H
23ClN
2·HCl) in the Capsule taken by the formula:
(TC/D)(AU / AS),
in which
T is the labeled quantity, in mg, of clomipramine hydrochloride in the Capsule;
C is the concentration, in µg per mL, of
USP Clomipramine Hydrochloride RS in the
Standard solution; D is the concentration, in µg per mL, of clomipramine hydrochloride in the
Test solution, based on the labeled quantity per Capsule and the extent of dilution; and
AU and
AS are the absorbances of the
Test solution and the
Standard solution, respectively.