A: Weigh and finely powder not less than 20 Tablets. Transfer a portion of the powder, equivalent to about 20 mg of triprolidine hydrochloride, to a glass-stoppered test tube, add 20 mL of water, and shake for 3 minutes. Add 2 mL of 1 N sodium hydroxide, mix, then add 3 mL of cyclohexane, shake for 3 minutes, and centrifuge for 5 minutes: the IR absorption spectrum of the clear supernatant so obtained exhibits maxima only at the same wavelengths as that of a similar preparation of USP Triprolidine Hydrochloride RS.

B: The retention time of the major peak in the chromatogram of the Assay preparation corresponds to that in the chromatogram of the Standard preparation as obtained in the Assay.

Medium: pH 4.0 ± 0.05 acetate buffer, prepared by mixing 4.9 g of glacial acetic acid and 2.45 g of sodium acetate trihydrate with water to obtain 1000 mL of solution; 500 mL.

Apparatus 1: 50 rpm.

Time: 30 minutes.

Procedure— Determine the amount of C19H22N2·HCl·H2O dissolved from UV absorbances at the wavelength of maximum absorbance at about 277 nm of filtered portions of the solution under test, in comparison with a Standard solution having a known concentration of USP Triprolidine Hydrochloride RS in the same medium.

Tolerances— Not less than 80% (Q) of the labeled amount of C19H22N2·HCl·H2O is dissolved in 30 minutes.

Procedure for content uniformity— Transfer 1 Tablet to a 100-mL volumetric flask, add 70 mL of water, and sonicate, swirling the flask intermittently, until the tablet is dissolved. Dilute with water to volume, mix, and filter, discarding the first 50 mL of the filtrate. Dilute a portion of the filtrate quantitatively and stepwise with 0.1 N sulfuric acid to obtain a solution having a concentration of about 1.25 µg of triprolidine hydrochloride per mL. Concomitantly determine the fluorescence intensities of this solution and a similarly prepared Standard solution having a known concentration of about 1.25 µg of USP Triprolidine Hydrochloride RS per mL, at the excitation wavelength of 300 nm with a slit width of 2 mm, and an emission wavelength of 460 nm with a slit width of 2 mm, with a suitable spectrophotometer, using 0.1 N sulfuric acid as the blank. Calculate the quantity, in mg, of C19H22N2·HCl·H2O in the Tablet taken by the formula: in which 332.88 and 314.86 are the molecular weights of the monohydrate and anhydrous forms of triprolidine hydrochloride, respectively; T is the labeled quantity, in mg, of triprolidine hydrochloride in the Tablet; C is the concentration, in µg per mL, of USP Triprolidine Hydrochloride RS in the Standard solution; D is the concentration, in µg per mL, of triprolidine hydrochloride in the solution from the Tablet, on the basis of the labeled quantity per Tablet and the extent of dilution, and IU and IS are the fluorescence intensities of the solution from the Tablet and the Standard solution, respectively.

(Official January 1, 2007)

Mobile phase and Standard preparation— Prepare as directed in the Assay under Triprolidine Hydrochlorides Oral Solution.

Assay preparation— Weigh and finely powder not fewer than 20 Tablets. Transfer an accurately weighed portion of the powder, equivalent to about 5.0 mg of triprolidine hydrochloride, to a 100-mL volumetric flask. Add about 10 mL of 0.01 N hydrochloric acid, and sonicate for 10 minutes. Cool to room temperature. Dilute with 0.01 N hydrochloric acid to volume, mix, and filter.

Chromatographic system and Procedure— Proceed as directed in the Assay under Triprolidine Hydrochlorides Oral Solution, except to calculate the quantity, in mg, of triprolidine hydrochloride (C19H22N2·HCl·H2O) in the portion of Tablets taken by the formula: in which 332.88 and 314.86 are the molecular weights of triprolidine hydrochloride monohydrate and anhydrous triprolidine hydrochloride, respectively; C is the concentration, in mg per mL, calculated on the anhydrous basis, of USP Triprolidine Hydrochloride RS in the Standard preparation; and rU and rS are the peak responses obtained from the Assay preparation and the Standard preparation, respectively.