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Effects of Chitosan Coating for Liposomes as an Oral Carrier  

Lee, Chang-Moon (Department of Nuclear Medicine, Chonbuk National University Medical School and Hospital)
Kim, Dong-Woon (Department of Clinical Pathology, Gwangyang Health College)
Lee, Ki-Young (Faculty of Applied Chemical Engineering, Chonnam National University)
Publication Information
Biomedical Science Letters / v.17, no.3, 2011 , pp. 211-216 More about this Journal
Abstract
The chitosan-coated liposomes (chitosomes) were designed to improve the stability in the gastrointestinal (GI) tract and to enhance the efficacy for oral drug delivery of liposomes. The phosphatic acid (PA)-incorporated anionic liposomes were surface-coated with water soluble chitosan (WSC) by electro-ionic interaction. The shape of the chitosomes observed by transmission electron microscopy (TEM) was spherical in all the formulations and the coating layer by WSC could be founded through TEM images. The mean size and the zeta potential values of the chitosomes increased significantly with depending on the content of WSC added for coating the liposomes. The stability of the chitosomes in the GI tract was confirmed through the change of relative turbidity of the liposomal suspension. The plain liposomes (plasomes) suspension without adding WSC clearly showed the change of relatively turbidity in simulated gastric fluid (SGF), while the change degree of turbidity of the chitosomes in the SGF decreased as increasing of WSC content added for coating liposome. In the 5-CF release study from the plasomes and chitosomes, the plasomes released >90% of the initial 5-CF content at 4 h of release measurement. In contrast, the chitosomes released below 40% of initial content of 5-CF. In conclusion, these results indicate that the chitosomes can be used as a potential carrier for effective oral drug delivery.
Keywords
Oral drug delivery; Liposomes; Chitosan; Stability in SGF;
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