Based on the solubility in supercritical CO2,two strategies in which CO2 plays different roles are used to make quercetine and astaxanthin particles by supercritical fluid technologies.The experimental results showed ...Based on the solubility in supercritical CO2,two strategies in which CO2 plays different roles are used to make quercetine and astaxanthin particles by supercritical fluid technologies.The experimental results showed that micronized quercetine particles with mean particle size of 1.0-1.5 μm can be made via solution enhanced dispersion by supercritical fluids(SEDS) process,in which CO2 worked as turbulent anti-solvent;while for astaxanthin,micronized particles with mean particle size of 0.3-0.8 μm were also made successfully by rapid expansion supercritical solution(RESS) process.展开更多
Two methods of supercritical fluid technology, gas anti-solvent and solution enhanced dispersion by supercritical fluids, were used respectively to prepare the sustained-release amoxicillin microparticles. The appeara...Two methods of supercritical fluid technology, gas anti-solvent and solution enhanced dispersion by supercritical fluids, were used respectively to prepare the sustained-release amoxicillin microparticles. The appearance, mean diameter, drug loading and in vitro release of microparticles were investigated.展开更多
目的:优化超临界流体强化溶液快速分散技术(SEDS)制备冬凌草甲素脂质体口服制剂(ORI-LIP)的工艺,并探讨其与常规脂质体制备技术的优势。方法:以粒径为评价指标,采用正交试验考察压力、温度、进样流速对SEDS制备ORI-LIP的影响。同时,采...目的:优化超临界流体强化溶液快速分散技术(SEDS)制备冬凌草甲素脂质体口服制剂(ORI-LIP)的工艺,并探讨其与常规脂质体制备技术的优势。方法:以粒径为评价指标,采用正交试验考察压力、温度、进样流速对SEDS制备ORI-LIP的影响。同时,采用薄膜分散法和逆向蒸发法制备ORI脂质体,比较3种方法所制脂质体的粒径、包封率、载药量及稳定性(6个月加速试验),并比较ORI原料药与3种脂质体的体外溶出行为的差异。结果:优化后的ORI-LIP SEDS制备工艺条件为温度50℃,压力18MPa,进样流速1 m L/min;与薄膜分散法和逆向蒸发法比较,以SEDS技术制备的脂质体的粒径[(147.4±4.8)nm]更小,包封率(67.8%)、载药量(7.8%)及稳定性(粒径略有增加,包封率仅降低4.4%)都更高。体外溶出试验结果显示,与原料药比较,各脂质体的释药速率缓慢且持久,且累积释放度更高;其中,SEDS技术制备的ORI-LIP在24 h时达到溶出平衡,且累积溶出度最高,达到67.2%。结论:SEDS制备的ORI-LIP粒径小,包封率、载药量较高,稳定性较好,能显著提高药物的体外溶出度;该技术与常规脂质体制备技术相比有一定的优势。展开更多
目的观察超临界流体强化溶液快速分散技术(SEDS)制备三七皂苷脂质体(PNS-Lip)的药剂学特征,并与常规脂质体制备方法进行比较。方法采用超临界流体强化溶液快速分散技术(SEDS)、薄膜分散法(TFD)、逆向蒸发法(RPE)制备PNS-Lip。透射电镜...目的观察超临界流体强化溶液快速分散技术(SEDS)制备三七皂苷脂质体(PNS-Lip)的药剂学特征,并与常规脂质体制备方法进行比较。方法采用超临界流体强化溶液快速分散技术(SEDS)、薄膜分散法(TFD)、逆向蒸发法(RPE)制备PNS-Lip。透射电镜观察不同PNS-Lip外观形态;检测粒径与电位;超滤法测定包封率(EE)和载药量(DL);以药物泄漏率(LR)评价制剂稳定性;进行体外溶出实验检测。结果不同制备方法制得的PNS-Lip呈现出淡蓝色乳光,表面光滑,形态圆整,具有双层膜结构。与PNS-Lip-RPE比较,PNS-Lip-TFD及PNS-Lip-SEDS粒径、多分散系数(PDI)、Zeta电位降低,60、120、180、240、300、360 s LR降低,EE和DL升高(P<0.05,P<0.01);PNS-Lip-SEDS在420s LR降低(P<0.05)。与PNS-Lip-TFD比较,PNS-Lip-SEDS的粒径、PDI及Zeta电位降低,180、240、300、360、420 s LR降低,EE和DL升高(P<0.05,P<0.01)。PNS-Lip-RPE及PNS-Lip-TFD在初始阶段存在突释作用,随后持续缓慢释放;PNS-Lip-SEDS未发生突释现象,缓释作用更加明显,在48 h后达到溶解平衡。结论SEDS作为新型的制粒技术,与常规的脂质体制备方法相比具有一定的优势,该技术在纳米给药系统领域具有广阔的应用前景。展开更多
基金Supported partially by the China Ministry of Science and Technology for the China’s Agenda 21 Strategic Research (MOST,2008IM021900)the General Administration of Quality Supervision Inspection and Quarantine of the People’s Republic of China for the 4th Food Safety Research (AQSIQ 2008:ASPAQ0809)
文摘Based on the solubility in supercritical CO2,two strategies in which CO2 plays different roles are used to make quercetine and astaxanthin particles by supercritical fluid technologies.The experimental results showed that micronized quercetine particles with mean particle size of 1.0-1.5 μm can be made via solution enhanced dispersion by supercritical fluids(SEDS) process,in which CO2 worked as turbulent anti-solvent;while for astaxanthin,micronized particles with mean particle size of 0.3-0.8 μm were also made successfully by rapid expansion supercritical solution(RESS) process.
文摘Two methods of supercritical fluid technology, gas anti-solvent and solution enhanced dispersion by supercritical fluids, were used respectively to prepare the sustained-release amoxicillin microparticles. The appearance, mean diameter, drug loading and in vitro release of microparticles were investigated.
文摘目的:优化超临界流体强化溶液快速分散技术(SEDS)制备冬凌草甲素脂质体口服制剂(ORI-LIP)的工艺,并探讨其与常规脂质体制备技术的优势。方法:以粒径为评价指标,采用正交试验考察压力、温度、进样流速对SEDS制备ORI-LIP的影响。同时,采用薄膜分散法和逆向蒸发法制备ORI脂质体,比较3种方法所制脂质体的粒径、包封率、载药量及稳定性(6个月加速试验),并比较ORI原料药与3种脂质体的体外溶出行为的差异。结果:优化后的ORI-LIP SEDS制备工艺条件为温度50℃,压力18MPa,进样流速1 m L/min;与薄膜分散法和逆向蒸发法比较,以SEDS技术制备的脂质体的粒径[(147.4±4.8)nm]更小,包封率(67.8%)、载药量(7.8%)及稳定性(粒径略有增加,包封率仅降低4.4%)都更高。体外溶出试验结果显示,与原料药比较,各脂质体的释药速率缓慢且持久,且累积释放度更高;其中,SEDS技术制备的ORI-LIP在24 h时达到溶出平衡,且累积溶出度最高,达到67.2%。结论:SEDS制备的ORI-LIP粒径小,包封率、载药量较高,稳定性较好,能显著提高药物的体外溶出度;该技术与常规脂质体制备技术相比有一定的优势。
文摘目的观察超临界流体强化溶液快速分散技术(SEDS)制备三七皂苷脂质体(PNS-Lip)的药剂学特征,并与常规脂质体制备方法进行比较。方法采用超临界流体强化溶液快速分散技术(SEDS)、薄膜分散法(TFD)、逆向蒸发法(RPE)制备PNS-Lip。透射电镜观察不同PNS-Lip外观形态;检测粒径与电位;超滤法测定包封率(EE)和载药量(DL);以药物泄漏率(LR)评价制剂稳定性;进行体外溶出实验检测。结果不同制备方法制得的PNS-Lip呈现出淡蓝色乳光,表面光滑,形态圆整,具有双层膜结构。与PNS-Lip-RPE比较,PNS-Lip-TFD及PNS-Lip-SEDS粒径、多分散系数(PDI)、Zeta电位降低,60、120、180、240、300、360 s LR降低,EE和DL升高(P<0.05,P<0.01);PNS-Lip-SEDS在420s LR降低(P<0.05)。与PNS-Lip-TFD比较,PNS-Lip-SEDS的粒径、PDI及Zeta电位降低,180、240、300、360、420 s LR降低,EE和DL升高(P<0.05,P<0.01)。PNS-Lip-RPE及PNS-Lip-TFD在初始阶段存在突释作用,随后持续缓慢释放;PNS-Lip-SEDS未发生突释现象,缓释作用更加明显,在48 h后达到溶解平衡。结论SEDS作为新型的制粒技术,与常规的脂质体制备方法相比具有一定的优势,该技术在纳米给药系统领域具有广阔的应用前景。