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• W4281782900 abstract "Chitosan (CS)-based polyplexes are produced by spontaneous electrostatic association with nucleic acids using CS in excess. Interactions of positively charged polyplexes, and the unbound CS, with negatively charged blood components limit the applicable dosage of such polymeric nanoparticles (NPs) and development of formulations with improved hemocompatibility and transfection efficiency is needed. Here, we introduce a strategy based on Tangential Flow Filtration (TFF) to remove unbound CS, concentrate polyplexes and subsequently coat with hyaluronic acid (HA) to improve hemocompatibility and bioactivity. Optimal TFF conditions were established. A library of HA with different molecular weights and degrees of sulfation was used at different carboxyl + sulfate to phosphate ratios for polyplex coating, bioactivity and hemocompatibility assessment. A systematic optimization of TFF conditions allowed for purification of polylpexes from excess unbound CS and subsequent coating with HA. Except for high molecular weight HA, for which macroscopic aggregation was observed, both sulfated and non-sulfated HAs resulted in small sized and homogenous coated complexes. However, sulfated HAs displayed higher stability during the second filtration process indicating their stronger binding affinity to polyplexes. Finally, we found that low molecular weight HA-coated polyplexes have equivalent silencing efficiency in vitro and improved hemocompatibility compared to uncoated polyplexes." @default.
• W4281782900 created "2022-06-13" @default.
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• W4281782900 date "2022-10-01" @default.
• W4281782900 modified "2023-09-30" @default.
• W4281782900 title "Purification and Surface Modification of Chitosan-based Polyplexes Using Tangential Flow Filtration and Coating by Hyaluronic Acid" @default.
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• W4281782900 doi "https://doi.org/10.1016/j.xphs.2022.05.021" @default.
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• W4281782900 hasPublicationYear "2022" @default.
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