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Emulsion Self‐Assembly Synthesis of Chitosan/Poly(lactic‐ co ‐glycolic acid) Stimuli‐Responsive Amphiphiles
Author(s) -
Niu Xufeng,
Wang Lizhen,
Chen Pin,
Li Xiaoming,
Zhou Gang,
Feng Qingling,
Fan Yubo
Publication year - 2013
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201200597
Subject(s) - plga , amphiphile , copolymer , polymer chemistry , micelle , glycolic acid , fourier transform infrared spectroscopy , emulsion , chitosan , materials science , chemical engineering , self assembly , biomaterial , chemistry , aqueous solution , pulmonary surfactant , organic chemistry , polymer , lactic acid , nanoparticle , nanotechnology , biology , bacteria , engineering , genetics
An amphiphilic graft copolymer using chitosan (CS) as a hydrophilic main chain and poly(lactic‐ co ‐glycolic acid) (PLGA) as a hydrophobic side chain is prepared through an emulsion self‐assembly synthesis. CS aqueous solution is used as a water phase and PLGA in chloroform is served as an oil phase. A water‐in‐oil (W/O) emulsion is fabricated in the presence of the surfactant span‐80. The self‐assembly reaction is performed between PLGA and CS under the condensation of EDC. Fourier transform IR (FTIR) spectroscopy reveals that PLGA is grafted onto the backbone of CS through the interactions between end carboxyl and amino groups of the two components. 1 H NMR spectroscopy directly indicates the grafting content of PLGA in the CS‐ graft ‐PLGA (CS‐ g ‐PLGA) copolymer is close to 25%. X‐ray diffraction (XRD) confirms that the copolymer exhibits an amorphous structure. The CS‐ g ‐PLGA amphiphile can self‐assemble to form micelles with size in the range of ≈100–300 nm, which makes it easy to apply in various targeted‐drug‐release and biomaterial fields.