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• W1992609344 abstract "In this study, three kinds of methylated chitosan containing different aromatic moieties were synthesized by two steps, reductive amination and methylation, respectively. The chemical structures of all methylated derivatives, methylated N-(4-N,N-dimethylaminocinnamyl) chitosan chloride (MDMCMChC), methylated N-(4-N,N-dimethylaminobenzyl) chitosan chloride (MDMBzChC), and methylated N-(4-pyridinylmethyl) chitosan chloride (MPyMeChC) were characterized by ATR–FTIR and 1H NMR spectroscopy. The complexes between the chitosan derivatives and plasmid DNA at different N/P ratios were characterized by gel electrophoresis, dynamic light scattering, and atomic force microscopic techniques. The smallest particle sizes of these complexes were obtained at N/P ratio of 5 and ranged from 95 to 124 nm while the zeta-potentials were in the range of 18–27 mV. Transfection efficiencies of these complexes were investigated by expression of the plasmid DNA encoding green fluorescence protein (pEGFP-C2) on human hepatoma cells (Huh 7 cells) compared to N,N,N-trimethyl chitosan chloride (TMChC). The rank of transfection efficiency was MPyMeChC > MDMBzChC > TMChC > MDMCMChC, respectively. The cytotoxicity of these complexes was also studied by MTT assay where the MPyMeChC complex exhibited less toxicity than other derivatives even at high N/P ratios. Therefore, MPyMeChC demonstrated potential as its safe and efficient gene carrier." @default.
• W1992609344 created "2016-06-24" @default.
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• W1992609344 date "2009-11-01" @default.
• W1992609344 modified "2023-10-16" @default.
• W1992609344 title "Methylated N-aryl chitosan derivative/DNA complex nanoparticles for gene delivery: Synthesis and structure–activity relationships" @default.
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• W1992609344 doi "https://doi.org/10.1016/j.carbpol.2009.06.006" @default.
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