title: Dual responsive copolymer micelles for drug controlled release.
abstract: pH- and temperature-responsive polymeric drug carriers based on Chitosan oligosaccharide (CSO)-g-Pluronic copolymers were successfully synthesized for Doxorubicin (DOX) controlled release. The critical aggregation concentration of CSO-g-Pluronic is 0.035 mg/mL at 25 degrees C. The CSO-g-Pluronic and DOX-loaded CSO-g-Pluronic micelles have an average hydrodynamic diameter of 23.3 nm and 43.6 nm respectively at 30 degrees C and pH 7.0 with narrow size distribution. The temperature or pH responsive behavior of the micelles was characterized by dynamic light scattering, fluorescence spectroscopy, and zeta Potential Analysis. The temperature-dependent micellar transformation was induced by dehydration of Pluronic segments at higher temperature. The pH responsive volume increase was traced to the electrostatic repulsion between CSO segments from protonation of amino groups under acidic conditions. Consequently, the DOX release time was prolonged by CSO-g-Pluronic micelles at body temperature of 37 degrees C, and the DOX release was accelerated at mild acidic conditions (i.e. the pH environment around tumor tissues). The temperature- and pH-responsive properties of CSO-g-Pluronic copolymer have provided promising potentials for biomedical and biotechnological applications.
authors.affiliation: National Key Laboratory of Biochemical Engineering, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Liangrong
authors.initials: L
authors.lastname: Yang
authors.forename: Chen
authors.initials: C
authors.lastname: Guo
authors.forename: Lianwei
authors.initials: L
authors.lastname: Jia
authors.forename: Xiangfeng
authors.initials: X
authors.lastname: Liang
authors.forename: Chunzhao
authors.initials: C
authors.lastname: Liu
authors.forename: Huizhou
authors.initials: H
authors.lastname: Liu
mesh_terms: D048271:Chitosan / Q000737:chemistry; D003692:Delayed-Action Preparations; D004317:Doxorubicin / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration; D008823:Micelles; D008954:Models, Biological; D015394:Molecular Structure; D009844:Oligosaccharides / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D013696:Temperature
chemical_list: D003692:Delayed-Action Preparations; D008823:Micelles; D009844:Oligosaccharides; D011108:Polymers; D004317:Doxorubicin; D048271:Chitosan