Forced degradation studies of medroxyprogesterone acetate injectable suspensions (150 mg/ml) with implementation of HPLC, mass spectrometry, and QSAR techniques

Medroxyprogesterone acetate (MPA) injectable products are a key commodity for reproductive health and are available in the global market from a variety of manufacturing sources. Depending on the climatic zone conditions of the destination country for product use, MPA injectables are at risk of exposure to adverse transport and storage conditions. Analytical methods are available that quantify impurity levels in MPA and MPA injectable products, but minimal information is publicly available on the source of impurity and degradation product generation or the safety risk of these compounds. Forced degradation studies were conducted on MPA and MPA injectables to gain a better understanding of potential sources of impurities and degradation products. Furthermore, QSAR analysis was conducted to assess the toxicity risk of known impurities. More impurities were generated under acidic, basic, light, and oxidative forced degradation conditions relative to thermal degradation, however thermal exposure is the most likely adverse condition to be experienced by these products. Even if impurities are present in MPA injectables, QSAR analysis found that known impurities for MPA are apparently no more of a safety risk than MPA.

Exploiting steroid-cyclodextrin complexes for selective determination of Estradiol Valerate and Norethisterone Acetate by synchronous fluorescence spectrofluorimetry

Inclusion complexes of β-cyclodextrin with Estradiol valerate (EST) or Norethisterone acetate (NOR) have been utilized for synchronous fluorescence spectrofluorimetry. β-cyclodextrin improves fluorescence intensity as well as water solubility of the studied drugs. Samples in aqueous medium adjusted with ammonia were used in synchronous fluorescence to resolve the overlapped emission spectra. The effects of β-cyclodextrin concentration and Δ λ have been optimized for sensitive and selective analysis of EST and NOR binary mixture. Synchronous fluorescence intensity of the two drugs is measured at Δ λ of 70 nm. EST and NOR can be simultaneously determined at 230 nm and 270 nm, respectively. Calibration curves were linear over the ranges of 0.5-6.0 μg mL^-1 and 0.2-2.0 μg mL^-1 for EST and NOR, respectively. Official guidelines were followed to estimate the validation parameters of the proposed method. The detection limits were 0.08 μg mL^-1 for EST and 0.007 μg mL^-1 for NOR. The proposed method was successfully used for the analysis of EST and NOR in their commercial preparations and the obtained results revealed statistical agreement with those obtained by application of the reported method for both drugs. The proposed method is compared favorably to previously published method in terms of simplicity and hazardous solvent consumption.