In this study, the rapid expansion of the supercritical solutions (RESS) process was used\nto produce microparticles of a commonly used anti-inflammatory drug, ethenzamide. The effects\nof process parameters in RESS including the extraction temperature, pre-expansion temperature,\nand post-expansion temperature were investigated using the Boxâ??Behnken design. According to\nthe results of the analysis of variance (ANOVA), the effect of pre-expansion temperature is the most\nsignificant parameter on the mean size of RESS-produced ethenzamide. A higher pre-expansion\ntemperature benefits the production of smaller crystals.........................
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