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Non-viral gene delivery systems based on polyethyleneimine (PEI) are efficient due to their proton-sponge effect within endosomes, but they have poor physical characteristics such as slow dissociation, cytotoxicity, and non targeted gene delivery. To overcome many of the problems associated with PEI, we synthesized a galactosylated poly(ethylene glycol)-chitosan-graft-spermine (GPCS) copolymer with...
Hydrogels are widely used in drug delivery systems because they can control the release and thereby enhance the efficiency of locally delivered bioactive molecules such as therapeutic drugs, proteins, or genes. For gene delivery, localized release of plasmid DNA or polymer/DNA complexes can transfect cells and produce sustained protein production. We tested the galactosylated chitosan-graft-polyethylenimine...
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