Triamcinolone, chemical structure, molecular formula, Reference Standards
»Triamcinolone contains not less than 97.0percent and not more than 102.0percent of C21H27FO6,calculated on the dried basis.
Packaging and storage
Preserve in well-closed containers.
USP Reference standards á11ñ
USP Triamcinolone RS.
Infrared Absorption á197Kñ.
Ultraviolet Absorption á197Uñ
20µg per mL.
Absorptivities at 238nm,calculated on the dried basis,do not differ by more than 3.0%.
Specific rotation á781Sñ:
between +65and +72.
2mg per mL,in dimethylformamide.
Loss on drying á731ñ
Dry it in vacuum at 60for 4hours:it loses not more than 2.0%of its weight.
Residue on ignition á281ñ:
Heavy metals,Method IIá231ñ:
Prepare a degassed solution containing about 60volumes of methanol and 40volumes of water such that the retention times for triamcinolone and hydrocortisone are about 5and 10minutes,respectively.
Internal standard solution
Dissolve hydrocortisone in Mobile phaseto obtain a solution having a concentration of about 0.3mg per mL.
Transfer about 10mg of USP Triamcinolone RS,accurately weighed,to a 50-mLvolumetric flask,dissolve in Internal standard solution,dilute with the same solvent to volume,and mix.
Using about 10mg of Triamcinolone,accurately weighed,prepare as directed under Standard preparation.
(see Chromatography á621ñ)The liquid chromatograph is equipped with a 254-nm detector and a 3.9-mm ×30-cm column that contains packing L1.The flow rate is about 1.5mLper minute.Chromatograph the Standard preparation,and record the peak responses as directed for Procedure:the relative standard deviation for replicate injections is not more than 2.0%,and the resolution factor between triamcinolone and hydrocortisone is not less than 3.0.
Separately inject equal volumes (about 10µL)of the Standard preparationand the Assay preparationinto the chromatograph by means of a suitable microsyringe or sampling valve,record the chromatograms,and measure the responses for the major peaks.Calculate the quantity,in mg,of C21H27FO6in the portion of Triamcinolone taken by the formula:
in which Cis the concentration,in mg per mL,of USP Triamcinolone RSin the Standard preparation,and RUand RSare the peak response ratios of triamcinolone to hydrocortisone obtained from the Assay preparationand the Standard preparation,respectively.
Staff Liaison:Clydewyn M.Anthony,Ph.D.,Scientist
Expert Committee:(PA1)Pharmaceutical Analysis 1
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