Danazol

This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition
Issued and maintained by the United States Pharmacopeial Convention (USP)
DOWNLOAD PDF HERE

C₂₂H₂₇NO₂             337.46

Pregna-2,4-dien-20-yno [2,3-d]isoxazol-17-ol, (17α)-.

17a-Pregna-2,4-dien-20-yno[2,3-dļisoxazol-17-ol CAS RN®: 17230-88-5; UNII: N29QWW3BUO.

Danazol contains not less than 97.0 percent and not more than 102.0 percent of C22H2NO2, calculated on the dried basis.

1 Packaging and storage-

Preserve in tight, light-resistant containers.

USP REFERENCE STANDARDS (11)-

USP Danazol RS

2 Identification-

Change to read:

A: Spectroscopic Identification Tests (197), Infrared Spectroscopy: 197K (CN 1-May-2020)

Change to read:

B: Spectroscopic Identification Tests (197), Ultraviolet-Visible Spectroscopy: 197U (CN 1-May-2020)

Solution: prepared as directed in the Assay.

2.1 SPECIFIC ROTATION (781S): between +21° and +27°.

Test solution: 10 mg per mL, in chloroform.

2.2 LOSS ON DRYING (731)-

Dry it at a pressure not exceeding 5 mm of mercury at 60° to constant weight: it loses not more than 2.0% of its weight.

3 Chromatographic purity-

Solvent-Prepare a mixture of chloroform and methanol (9:1).

Standard solutions-Dissolve an accurately weighed quantity of USP Danazol RS in Solvent to obtain a solution having a known concentration of 1 mg per mL. Dilute quantitatively with Solvent to obtain Standard solutions having the following compositions:

Test solution-Dissolve an accurately weighed quantity of Danazol in Solvent to obtain a solution containing 50 mg per mL.

Procedure-Apply separately 5 µL of the Test solution and 5 µL of each Standard solution to a suitable thin-layer chromatographic plate (see Chromatography (621)) coated with a 0.25-mm layer of chromatographic silica gel mixture. Position the plate in a chromatographic chamber and develop the chromatograms in a solvent system consisting of a mixture of cyclohexane and ethyl acetate (7:3) until the solvent front has moved about three-fourths of the length of the plate. Remove the plate from the developing chamber, mark the solvent front, and allow the solvent to evaporate in warm, circulating air. Examine the plate under short-wavelength UV light. Expose the plate to iodine vapors for 5 minutes. Compare the intensities of any secondary spots observed in the chromatogram of the Test solution with those of the principal spots in the chromatograms of the Standard solutions: the sum of the intensities of secondary spots obtained from the Test solution corresponds to not more than 1.0% of related compounds, with no single impurity corresponding to more than 0.5%.

4 Assay-

Dissolve about 100 mg of Danazol, accurately weighed and previously dried, in about 50 mL of alcohol in a 100-mL volumetric flask, swirl until dissolved, dilute with alcohol to volume, and mix. Transfer 2.0 mL of this solution to a 100-mL volumetric flask, dilute with alcohol to volume, and mix. Similarly, dissolve an accurately weighed quantity of USP Danazol RS in alcohol to obtain a Standard solution having a known concentration of about 20 µg per mL. Concomitantly determine the absorbances of both solutions in 1-cm cells at the wavelength of maximum absorbance at about 285 nm, using alcohol as the blank. Calculate the quantity, in mg, of C₂₂H₂₇NO₂ in the portion of Danazol taken by the formula:

5C(A_u/A_s)

in which C is the concentration, in µg per mL, of USP Danazol RS in the Standard solution; and A_u, and A_s, are the absorbances of the solution of Danazol and the Standard solution, respectively.