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Co polymerization of chitosan selectively grafted by polyethylene glycol was studied in this paper. The graft copolymers can be expected to be used as DNA delivery vectors because of the improving hydrophilicity of chitosan and reserving the amino groups on chitosan chains. Chitosan was selectively grafted by monomethoxy polyethylene glycol(mPEG-OH), which contains a hydroxyl group combining with...
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