期刊
JOURNAL OF CONTROLLED RELEASE
卷 125, 期 3, 页码 236-245出版社
ELSEVIER
DOI: 10.1016/j.jconrel.2007.10.023
关键词
intestinal absorption; calcitonin; pectin-liposome nanocomplexes (PLNs); pectin; mucoadhesive delivery; oral drug delivery; confocal laser scanning microscopy
Self-assembling pectin-liposome nanocomplexes (PLNs) were prepared by a simple mixing of cationic liposomes with pectin solution, in order to improve intestinal absorption of calcitonin (eCT). Both in-vitro and in-vivo evaluations for PLNs were evaluated. The results showed that average particle size of PLNs was significantly larger than that of initial cationic liposomes. The surface charges were shifted from positive to negative after mixing with pectin. The PLNs made of high degree of esterification (DE) pectin showed less negatively charged values than those made of low DE pectin. The entrapment efficiency in cationic liposomes was in the same range even if the drug loading was increased. The in-vivo mucoadhesive test of pectin by confocal laser scanning microscopy demonstrated stronger mucoadhesive properties of PLNs made of low DE pectin, compared to cationic liposomes and PLNs made of other pectins. Moreover, high intensities of a fluorescent marker could be observed throughout the small intestines (i.e. duodenum, jejunum and ileum) and remained at the site of mucoadhesion even after 6 h of administration of PLNs made of low DE pectin. The eCT-loaded PLNs demonstrated a strong pharmacological action over the eCT solution and eCT-loaded liposomes, in which an enhanced and prolonged reduction in plasma calcium concentration of rats was observed. This was attributed to the ability of pectin to adhere to the mucus layer and prolong retention in the intestinal mucosa. (C) 2007 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据