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10.1208/s12249-012-9920-2

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23371786DevelopmentandValidationofaDiscriminativeDissolutionTestforBetamethasoneSodiumPhosphateandBetamethasoneDipropionateIntramuscularInjectableSuspension.!3581667!23371786
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suck abstract from ncbi


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pmid23371786      AAPS+PharmSciTech 2013 ; 14 (1): 425-34
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  • Development and validation of a discriminative dissolution test for betamethasone sodium phosphate and betamethasone dipropionate intramuscular injectable suspension #MMPMID23371786
  • Simon A; de Almeida Borges VR; Cabral LM; de Sousa VP
  • AAPS PharmSciTech 2013[Mar]; 14 (1): 425-34 PMID23371786show ga
  • The intramuscular administration of the injectable suspension betamethasone sodium phosphate (BSP) and betamethasone dipropionate (BD) has immediate therapeutic activity due to solubilized BSP and prolonged activity resulting from the slow release of BD micro-crystals. The purpose of this study was to develop and validate a dissolution method for BD in intramuscular injectable suspensions with detection by high-performance liquid chromatography (HPLC) method. Five commercial products presented a distribution of particle sizes, ranging between 7.43 and 40.25 mum as measured by laser diffraction. It was also found that particle sizes differed between batches of the same product. The different products were tested using the paddle apparatus, with stirring speeds of 25 and 50 rpm in 300 mL of phosphate buffer; simulated body fluid, muscle fluid, and synovial fluid were used as biorelevant dissolution media at 37+/-0.5 degrees C. It was verified that not only does average particle size affect the dissolution rate, but also the mode and the polydispersity index of the particles. Discriminatory power was obtained using the in vitro dissolution method with 0.1 M sodium phosphate buffer pH 7.4 containing 0.1% sodium lauryl sulfate and a stirring speed of 50 rpm. The HPLC-method is linear, precise, selective, and accurate for the quantification of BSP and BD in dissolution profile testing. This dissolution method can be utilized as a method to control the quality of these injectable suspensions.
  • |Betamethasone/administration & dosage/*analogs & derivatives/chemistry[MESH]
  • |Chromatography, High Pressure Liquid[MESH]
  • |Injections, Intramuscular[MESH]
  • |Particle Size[MESH]


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