纳米乳液

Optimization of headspace solid-phase microextraction for analysis of β-caryophyllene in a nanoemulsion dosage form prepared with copaiba ( Copaifera multijuga Hayne) oil

ty10086 提交于 周四, 08/26/2021 - 13:40
Abstract(#br)Recent studies have shown the anti-inflammatory activity of Copaiba oils may be addressed to the high content of β-caryophyllene, the most common sesquiterpene detected, especially in the Copaifera multijuga Hayne species. In the present study, nanoemulsions were proposed as a delivery system for copaiba oil in view to treat locally inflamed skin. This article describes the optimization and validation of a stability-indicating SPME-GC method, for β-caryophyllene analysis in the nanoemulsions produced by high pressure homogenization.

稳定的亚100 nm PDMS纳米颗粒作为细胞内药物传递载体。

ty10086 提交于 周三, 08/25/2021 - 16:09
在过去的几十年里,聚二甲基硅氧烷( PDMS )弹性体被广泛地应用于生物医学领域。然而,PDMS在细胞内药物传递方面的研究并不多,因为制备了亚100nm的颗粒,由于其固有的成膜性质,这种应用的首选材料极为困难。在本工作中,我们进行了分子动力学( MD )模拟,发展了一种策略来限制PDMS固有的成膜倾向,以获得稳定的亚100nm PDMS纳米粒子。MD模拟结果表明,PDMS表面羟基的引入提高了其以纳米粒子形式存在的稳定性。基于MD模拟结果,首次在纳米乳滴内部用氢氧化钠对PDMS进行原位表面改性,制备了亚100 nm PDMS纳米颗粒。合成的纳米颗粒尺寸为30 ~ 40 nm,性质极软,在磷酸盐缓冲生理盐水中适度疏水稳定。体外实验结果表明,所合成的PDMS纳米粒子具有良好的生物相容性和在癌细胞线粒体内选择性定位的内在能力。此外,抗癌药物多柔比星通过PDMS纳米颗粒的高效线粒体传递主张其适合作为开发先进纳米药物的潜在候选人。