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Formulation of Bioerodible Ketamine Microparticles as an Analgesic Adjuvant Treatment Produced by Supercritical Fluid Polymer Encapsulation

机译:通过超临界流体聚合物包封制备可生物蚀解的氯胺酮微粒作为止痛辅助剂

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摘要

Pain is inadequately relieved by escalating doses of a strong opioid analgesic such as morphine in up to 25% of patients with cancer-related severe pain complicated by a neuropathic (nerve damage) component. Hence, there is an unmet medical need for research on novel painkiller strategies. In the present work, we used supercritical fluid polymer encapsulation to develop sustained-release poly(lactic-co-glycolic acid) (PLGA) biodegradable microparticles containing the analgesic adjuvant drug ketamine, for injection by the intrathecal route. Using this approach with a range of PLGA co-polymers, drug loading was in the range 10–60%, with encapsulation efficiency (EE) of 60–100%. Particles were mainly in the size range 20–45 µm and were produced in the absence of organic solvents and surfactants/emulsifiers. Investigation of the ketamine release profiles from these PLGA-based microparticles in vitro showed that release took place over varying periods in the range 0.5–4.0 weeks. Of the polymers assessed, the ester end-capped PLGA5050DLG-1.5E gave the best-controlled release profile with drug loading at 10%.
机译:在多达25%的癌症相关性严重疼痛并伴有神经性(神经损伤)成分的患者中,通过增加剂量的强效阿片类镇痛剂(例如吗啡)无法充分缓解疼痛。因此,对于新型止痛药策略的研究存在医学上未满足的需求。在目前的工作中,我们使用超临界流体聚合物封装技术开发了包含镇痛辅助药氯胺酮的缓释聚乳酸-乙醇酸共聚物(PLGA)可生物降解微粒,可通过鞘内途径进行注射。使用这种方法和一系列PLGA共聚物,载药量在10-60%的范围内,包封效率(EE)为60-100%。颗粒的大小主要在20-45 µm之间,是在没有有机溶剂和表面活性剂/乳化剂的情况下产生的。对这些基于PLGA的微粒体外氯胺酮释放曲线的研究表明,释放发生在0.5-4.0周的不同时期内。在所评估的聚合物中,酯封端的PLGA5050DLG-1.5E具有最佳的控释特性,载药量为10%。

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