Pregna-1,4-diene-3,20-dione, 9-chloro-11-hydroxy-16-methyl-17,21-bis(1-oxopropoxy)-, (11,16)-.
9-Chloro-11,17,21-trihydroxy-16-methylpregna-1,4-diene-3,20-dione 17,21-dipropionate [5534-09-8].
» Beclomethasone Dipropionate is anhydrous or contains one molecule of water of hydration. It contains not less than 97.0 percent and not more than 103.0 percent of C28H37ClO7, calculated on the dried basis.
Packaging and storage Preserve in well-closed containers.
Identification, Infrared Absorption 197M.
Specific rotation 781S: between +88 and +94.
Test solution: 10 mg per mL, in dioxane.
Loss on drying 731 Dry it at 105 for 3 hours: the anhydrous form loses not more than 0.5% of its weight; the monohydrate form loses between 2.8% and 3.8% of its weight.
Residue on ignition 281: not more than 0.1%.
Mobile phase Prepare a suitable degassed solution of 3 volumes of acetonitrile in 2 volumes of water, such that the retention time of beclomethasone dipropionate is approximately 6 minutes and that of testosterone propionate is approximately 10 minutes.
Internal standard solution Dissolve a suitable quantity of USP Testosterone Propionate RS, accurately weighed, in methanol to obtain a solution having a concentration of about 1.2 mg per mL.
Standard preparation Dissolve a suitable quantity of USP Beclomethasone Dipropionate RS, accurately weighed, in methanol to obtain a solution having a concentration of about 1.4 mg per mL. Transfer 4.0 mL of this solution to a suitable vial, and add 4.0 mL of Internal standard solution to obtain a solution having a known concentration of about 0.7 mg per mL with respect to the Reference Standard and 0.6 mg per mL with respect to the internal standard.
Assay preparation Weigh accurately about 70 mg of Beclomethasone Dipropionate, transfer to a 50-mL volumetric flask, dilute with methanol to volume, and mix. Transfer 4.0 mL of this solution to a suitable vial, and add 4.0 mL of Internal standard solution.
Procedure Separately inject equal volumes (between 5 µL and 25 µL) of the Assay preparation and the Standard preparation into a high-performance liquid chromatograph (see Chromatography 621) operated at room temperature, adjusting the specimen size and other operating parameters such that the peak obtained with the internal standard in the Standard preparation is about 0.6 to 0.9 full-scale. Typically, the apparatus is fitted with a 4-mm × 30-cm column that contains packing L1 and is equipped with an UV detector capable of monitoring absorption at 254 nm, a suitable recorder, and a pump capable of operating at a column pressure of up to 3500 psi. In a suitable chromatogram, the coefficient of variation for five replicate injections of the Standard preparation is not more than 3.0%. Calculate the quantity, in mg, of C28H37ClO7 in the portion of Beclomethasone Dipropionate taken by the formula:
100C(RU / RS)in which C is the concentration, in mg per mL, of USP Beclomethasone Dipropionate RS in the Standard preparation; and RU and RS are the peak height ratios of beclomethasone dipropionate to the internal standard obtained from the Assay preparation and the Standard preparation, respectively.
Auxiliary Information Please check for your question in the FAQs before contacting USP.Chromatographic Column
USP32NF27 Page 1631
Chromatographic columns text is not derived from, and not part of, USP 32 or NF 27.