Nanoliposomes are important carriers capable of packaging drugs for various delivery applications through passive targeting tumor sites by enhancing permeability and retention effect. Radiolabeled liposomes have potential applications in radiotherapy and diagnostic imaging. However, the physico-chemical instability of liposomes during manufacturing and storage limits their extensive application. Therefore, considerable numbers of studies have been made on the stability of liposomes over the last few years in order to overcome this problem. In this study, we attempted to prepare polymer-coated liposomes using water-soluble chitosan in order to enhance the stability of rhenium(III) chloride-incorporated liposomes. They were characterized by an electrophoretic light-scattering spectrophotometer, Fourier transform infrared spectroscopy (FT-IR), UV–Vis spectrometer, and phase-contrast microscopy. The chitosan-coated liposomes are spherical and the particle size is about 800–850 nm. Incorporation of chitosan into the liposome bilayer decreased rhenium(III) chloride release from the liposome due to an increased rigidity of the liposome membrane structure. Chitosan-coated liposomes showed a higher stability compared with the stability of non-coated liposomes. The release characteristics of rhenium(III) chloride encapsulated in the liposome were taken as a measure of stability of the liposome membrane.
Research on Chemical Intermediates – Springer Journals
Published: Sep 18, 2010
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