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微脂粒包覆天然維生素E之物化特徵與經皮吸收行為

Physicochemical Properties and Skin Permeation Behaviors of Liposomes Encapsulated Natural Vitamin E

摘要


本研究擬以氫化磷脂質(hydrogenated lecithin, HL)混合硬脂酸(stearic acid, SA)製備微脂粒包覆天然維生素E (α-tocopherol, VE),期望能開發出可長期儲存安定之配方。並透過粒徑(particle size)、粒徑分佈係數(polydispersity index)、界面電位(zeta potential)及螢光偏極化(fluorescence polarization)的量測,來探討微脂粒之物理化學現象。同時篩選出較安定之微脂粒配方,進行包覆VE之實驗。結果發現以組成配方HL/SA:VE (9/1:1(莫耳比)),為儲存穩定天數(stable days)最長的配方,而HL/SA:VEA及HL/SA:VE(5/5:1(莫耳比)),則是包覆效率最高的配方。除此之外,透過體外皮膚穿透實驗,了解微脂粒包覆VE之皮膚穿透效率。由實驗結果得知,分散在水溶液中之天然維生素E無法穿透皮膚,但以HL/SA微脂粒包覆VE具有皮膚滲透之效果。

並列摘要


This research aimed to mix hydrogenated lecithin (HL) with stearic acid (SA) to encapsulate natural vitamin (VE) for development of a stable formula. The average particle size, polydispersity index, zeta potential and fluorescence polarization were measured to study phenomenon of liposome. Furthermore a reliable liposomal formulation was selected to carry out experiment of entrapment efficiency for VE. The result showed that HL/SA:VE (5/5:1, molar ratio) formula expressed the highest entrapment efficiency. In addition, VE dispersion and the liposomes entrapped vitamin E were utilized to evaluate the permeation efficiency by skin penetration of drug in vitro. As the result shown, VE dispersion cannot penetrate into skin, but liposomes entrapped VE can.

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