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- W2898029579 abstract "Abstract Oxidative stress and abnormally high levels of reactive oxygen species (ROS) play an essential role in the pathogenesis and progression of inflammatory bowel disease (IBD). Oxidation‐responsive nanoparticles (NPs) are formulated from a phenylboronic esters‐modified dextran (OxiDEX) that degrades selectively in response to hydrogen peroxide (H 2 O 2 ). OxiDEX NPs are coated with chitosan and encapsulated in a pH‐sensitive polymer to produce nano‐in‐micro composites. The microparticles are spherical with homogeneous particle size (53 ± 3 µm) and maintain integrity at acidic pH, preventing the premature release of the NPs in gastric conditions. The degradation of NPs is highly responsive to the level of H 2 O 2 , and the release of the drug is sustained in the presence of physiologically relevant H 2 O 2 concentrations. The presence of chitosan on the particles surface significantly enhances NPs stability in intestinal pH and their adhesion on the intestinal mucosa. Compared to a traditional enteric formulation, this formulation shows tenfold decreased drug permeability across C2BBe1/HT29‐MTX cell monolayer, implying that lower amount of drug would be absorbed to the blood stream and, therefore, limiting the undesired systemic side effects. Based on these results, a successful nano‐in‐micro composite for targeted therapy of IBD is obtained by combination of the responsiveness to pH and ROS." @default.
- W2898029579 created "2018-10-26" @default.
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- W2898029579 date "2018-10-16" @default.
- W2898029579 modified "2023-10-14" @default.
- W2898029579 title "pH and Reactive Oxygen Species‐Sequential Responsive Nano‐in‐Micro Composite for Targeted Therapy of Inflammatory Bowel Disease" @default.
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- W2898029579 doi "https://doi.org/10.1002/adfm.201806175" @default.
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