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Self‐Assembled Micelles Based on PEG‐Polypeptide Hybrid Copolymers for Drug Delivery
Author(s) -
Hua ShouHu,
Li YongYong,
Liu Yun,
Xiao Wang,
Li Cao,
Huang FuWei,
Zhang XianZheng,
Zhuo RenXi
Publication year - 2010
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200900473
Subject(s) - copolymer , micelle , amphiphile , ethylene glycol , peg ratio , materials science , drug delivery , biocompatibility , circular dichroism , polymer chemistry , drug carrier , chemical engineering , chemistry , nanotechnology , organic chemistry , polymer , crystallography , aqueous solution , finance , economics , engineering , composite material , metallurgy
A series of amphiphilic poly( L ‐leucine)‐ block ‐poly(ethylene glycol)‐ block ‐poly( L ‐leucine) (PLL‐PEG‐PLL) hybrid triblock copolymers have been synthesized. All the blocks in this system have good biocompatibility and low toxicity. The PLL‐PEG‐PLL copolymers could self‐assemble into micelles with PLL blocks as the hydrophobic core and PEG blocks as the hydrophilic shell, which were characterized by FT‐IR, 1 H NMR, and transmission electron microscopy analysis. The critical micellar concentration of the copolymer was 95.0 mg · L −1 . The circular dichroism spectrum shows that the PLL segments adopt a unique α ‐helical conformation, which is found to play an important role in controlling the drug release rate. The drug release could be effectively sustained by encapsulation in the micelles. The copolymers may have potential applications in drug delivery.