利多卡因
透皮
盐酸利多卡因
差示扫描量热法
聚乙二醇
材料科学
涂层
PEG比率
色谱法
溶解
药物输送
化学工程
生物医学工程
化学
药理学
复合材料
纳米技术
有机化学
麻醉
医学
财务
经济
工程类
物理
热力学
作者
Yunzhe Ma,Harvinder Singh Gill
摘要
This study demonstrates for the first time the ability to coat solid dispersions on microneedles as a means to deliver water‐insoluble drugs through the skin. Polyethylene glycol (PEG) was selected as the hydrophilic matrix, and lidocaine base was selected as the model hydrophobic drug to create the solid dispersion. First, thermal characterization and viscosity measurements of the PEG–lidocaine mixture at different mass fractions were performed. The results show that lidocaine can remain stable at temperatures up to ∼130°C and that viscosity of the PEG–lidocaine molten solution increases as the mass fraction of lidocaine decreases. Differential scanning calorimetry demonstrated that at lidocaine mass fraction less than or equal to 50%, lidocaine is well dispersed in the PEG–lidocaine mixture. Uniform coatings were obtained on microneedle surfaces. In vitro dissolution studies in porcine skin showed that microneedles coated with PEG–lidocaine dispersions resulted in significantly higher delivery of lidocaine in just 3 min compared with 1 h topical application of 0.15 g EMLA®, a commercial lidocaine–prilocaine cream. In conclusion, the molten coating process we introduce here offers a practical approach to coat water‐insoluble drugs on microneedles for transdermal delivery. © 2014 Wiley Periodicals, Inc. and the American Pharmacists Association J Pharm Sci 103:3621–3630, 2014
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