Comparison of surfactants used to prepare aqueous perfluoropentane emulsions for pharmaceutical applications.

Comparison of surfactants used to prepare aqueous perfluoropentane emulsions for pharmaceutical applications.
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DOI:
10.1021/la100307r
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发表时间:
2010-04-06
期刊:
Langmuir : the ACS journal of surfaces and colloids
影响因子:
--
通讯作者:
Magda JJ
Magda JJ
中科院分区:
其他
文献类型:
--
作者:
Kandadai MA;Mohan P;Lin G;Butterfield A;Skliar M;Magda JJ

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全氟戊烷(PFP)是一种高疏水性、无毒、无致癌性的氟代烷烃,在生物医学领域有着广泛的应用,包括封闭治疗和药物控释。对于大多数这些应用,在水性介质中分散大量适当尺寸的PFP液滴是至关重要的。令人惊讶的是,在用于稳定乳液的表面活性剂存在下,PFP对水的界面张力很少被测量。在这项研究中,我们报告了PFP的界面张力在以前的研究中使用的表面活性剂,以生产用于生物医学应用的乳液:聚氧化乙烯-共-聚乳酸(PEO-PLA),聚氧化乙烯-共-聚-ε-己内酯(PEO-PCL)。由于这两种表面活性剂都是不带电的二嵌段共聚物,依赖于空间稳定的机制,我们还调查了比较的缘故使用的小分子阳离子表面活性剂十六烷基三甲基溴化铵(CTAB),和更大的蛋白质表面活性剂牛血清白蛋白(BSA)。这里提出的结果补充了以前的报告的PFP液滴尺寸分布,并将有助于确定在何种程度上的界面张力值可以用来控制平均PFP液滴尺寸。
Perfluoropentane (PFP), a highly hydrophobic, non-toxic, non-carcinogenic fluoroalkane, has generated much interest in biomedical applications, including occlusion therapy and controlled drug delivery. For most of these applications, the dispersion within aqueous media of a large quantity of PFP droplets of the proper size is critically important. Surprisingly, the interfacial tension of PFP against water in the presence of surfactants used to stabilize the emulsion has rarely, if ever, been measured. In this study, we report the interfacial tension of PFP in the presence of surfactants used in previous studies to produce emulsions for biomedical applications: polyethylene oxide-co-polylactic acid (PEO-PLA, and polyethylene oxide-co-poly-ε-caprolactone (PEO-PCL). Since both of these surfactants are uncharged diblock copolymers that rely on the mechanism of steric stabilization, we also investigate for comparison’s sake use of the small molecule cationic surfactant cetyl trimethyl ammonium bromide (CTAB), and the much larger protein surfactant bovine serum albumin (BSA). The results presented here complement previous reports of the PFP droplet size distribution, and will be useful for determining to what extent the interfacial tension value can be used to control the mean PFP droplet size.
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