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Metformin hydrochloride sustained release biopolymeric system composed by PLLA-CMC microparticles

机译:盐酸二甲双胍持续释放生物聚合系统,由PLLA-CMC微粒组成

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摘要

Metformin hydrochloride (MetHCl) is a drug extensively used to treat diabetes mellitus Type 2. However, its high hydrophilicity drastically reduces its metabolic absorption. Consequently, high drug concentrations should be taken by patients to achieve the desired therapeutical efficiency, causing several side effects. The present study proposes the development of a MetHCl sustained release biopolymeric system composed of poly(l-lactic acid) (PLLA) and carboxymethyl cellulose (CMC) as a strategy to minimize the problems aforementioned. The PLLA-CMC microparticles were produced by the double emulsion-solvent evaporation technique using two distinct emulsifiers in the first emulsion (Spam 80 and Tween 80). The microparticles were characterized by ultraviolet-visible spectrophotometry, scanning electron microscopy with field emission gun, thermalgravimetric analyses, and differential scanning calorimetry (DSC). Additionally, in vitro drug release assays were performed. The results demonstrated that the emulsion stability and encapsulation efficiency increased in a dependent fashion way with the CMC concentration. DSC findings showed that the choice of the emulsifier of the first emulsion influences the polymer particle's crystallinity and, consequently, the releasing behavior of the drug. The in vitro studies revealed that the encapsulation of MetHCl in PLLA-CMC microparticles is a promising sustained release system compatible with a zero-order kinetic mechanism.
机译:盐酸二甲双胍(MetHCl)是一种广泛用于治疗2型糖尿病的药物。然而,它的高亲水性大大降低了代谢吸收。因此,患者应服用高浓度的药物,以达到预期的治疗效果,从而产生多种副作用。本研究提出开发一种由聚l-乳酸(PLLA)和羧甲基纤维素(CMC)组成的MetHCl缓释生物聚合物系统,作为最小化上述问题的策略。PLLA-CMC微粒是通过双乳液溶剂蒸发技术在第一个乳液(Spam 80和Tween 80)中使用两种不同的乳化剂制备的。通过紫外-可见分光光度法、场发射枪扫描电镜、热重分析和差示扫描量热法(DSC)对微粒进行了表征。此外,还进行了体外药物释放试验。结果表明,随着CMC浓度的增加,乳液的稳定性和包封率呈依赖性增加。DSC结果表明,第一种乳液乳化剂的选择会影响聚合物颗粒的结晶度,从而影响药物的释放行为。体外研究表明,在PLLA-CMC微粒中包裹甲基氯甲烷是一种很有前途的缓释系统,符合零级动力学机制。

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