Study on Preparation of Paclitaxel-sorafenib-PLGA-loaded Embolic Microspheres and in vitro Drug Release Characteristics / 中国药房

ABSTRACT

OBJECTIVE： To prepare Paclitaxel-sorafenib-PLGA-loaded embolic microspheres， and to establish a method for the content determination and investigate their in vitro drug release characteristics. METHODS： Paclitaxel-sorafenib-PLGA-loaded embolic microspheres were prepared by emulsification-solvent evaporation method. HPLC method was used to determine the contents of paclitaxel and sorafenib in Paclitaxel-sorafenib-PLGA-loaded embolic microspheres； drug-loading amount and encapsulation efficiency were calculated. The determination was performed on Agilent TC-C18 column with mobile phase consisted of water-acetonitrile （40 ∶ 60，V/V） at the flow rate of 1.0 mL/min. The detection wavelength was set at 228 nm， and column temperature was 28 ℃. The sample size was 10 μL. The morphology of the microspheres was observed by optical microscopy and scanning electron microscopy. The particle size and granularity distribution of microspheres were measured by laser granularity analyzer. The release rates of paclitaxel and sorafenib were determined by HPLC under physiological temperature （37 ℃）. The reaction rate constants were predicted by Arrhenius equation at 37 ℃， and compared with the measured value （37 ℃）. RESULTS： The linear range of paclitaxel and sorafenib were 2.0-400.0 μg/mL （both r＝0.999 6）. The quantitative limits were 1.902 6 and 1.890 2 μg/mL， and detection limits were 0.985 5 and 1.264 5 μg/mL， respectively. RSDs of precision， stability and reproducibility tests were all lower than 2％. The recoveries were 99.00％-102.91％ （RSD＝1.12％， n＝9） and 98.39％-102.96％ （RSD＝1.94％， n＝9）. The surface of the microspheres were spherical， smooth and no protuberance and no adhesions. The average particle size was （139±1.16） μm. Drug-loading amounts of paclitaxel and sorafenib were 1.12％ and 0.85％， respectively. The encapsulation efficiency were 73.11％ and 58.65％， respectively. Accumulative release rates were （71.83±3.96）％ and （81.44±6.02）％ within 41 d at 37 ℃. RSDs for relative standard deviation of prediction reaction rate constant to measured value were less than 10％ for paclitaxel and sorafenib. The similarity factors were 83.53 and 73.95. CONCLUSIONS： Paclitaxel-sorafenib-PLGA-loaded embolic microspheres are successfully prepared. The microspheres have good morphology and sustained release. The predicted release curve is well correlated with the measured release curve. Established determination method is simple and stable.