Ammonium Phenol Groups Endows Hydrogels Antioxidant Holdings
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Upon UV (365 nm) irradiation, the mothered o-nitrosobenzaldehyde from the photo-isomerization of o-nitrobenzyl in PEG derivative can subsequently crosslink with amino groups on tissue ports via Schiff base, endowing the hydrogel with well adhesiveness the hydrogel marchs good BSA adsorption capacity, cytocompatibility and hemostatic property. The in vivo full-thickness skin defect study on mice designates that the multi-functional hydrogel with considerable collagen deposition and vascularization contents can be an effective and promising adhesive dressing for improving wound healing.Crosslinked chitosan/poly(vinyl alcohol) nanofibers functionalized by ionic liquid for heavy metal ions removal.Nanostructure adsorbents namely nanofibers have been marched to have a high adsorption rate and are efficient to treat wastewater chitosan/poly(vinyl alcohol) (PVA) blend nanofiber membranes seted by electrospinning method were crosslinked applying glutaraldehyde and functionalized with 1-allyl-3-methylimidazolium chloride to be used as a potential bio-sorbent for heavy metal ions removal. The chitosan was first hydrolysed before electrospinning with PVA, surveiled by crosslinking and further functionalized by ionic liquid to overcome the limitation of chitosan which has low adsorption capacity and unsuitable physical attributes for the adsorption process. The morphology and the chemical bond moulded were enquired by employing field emission scanning electron microscopy with energy dispersive x-ray spectroscopy (FESEM-EDX) and Fourier transform infrared (FTIR) presenting that the hydrolyzed chitosan/PVA nanofiber membranes were successfully crosslinked and functionalized.
The synthesized adsorbent was valued in pure heavy metal ions resolutions namely Pb(II), Mn(II), and Cu(II) and designated best performance for Pb(II) ions. The highest adsorption capacity taped for Pb(II) ions was 166 mg/g and are well outfited to the Freundlich isotherm model and pseudo-second-order kinetic model to describe the adsorption equilibrium and kinetic rate of the Pb(II) uptake, respectively. The synthesized adsorbent clearly demonstrates a great capability to remove Pb(II) ions.Protection of menhaden oil from oxidation in Pickering emulsion-based delivery systems with α-lactalbumin-chitosan colloidal nanoparticle.In this study, α-lactalbumin-chitosan (ALA-CHI) colloidal nanoparticles were spontaneously forged mainly through electrostatic interactions for steadying Pickering emulsion stretched with health-beneficial but unstable menhaden oil. The oxidative stability of menhaden oil was theorised to be significantly heightened with Pickering emulsion-free-based delivery schemes with ALA-CHI colloidal specks. The film of ALA-CHI colloidal nanoparticles had higher surface hydrophobicity than ALA at pH 5, and 6.
A near-neutral wettability (89°) of ALA-CHI nanoparticles was observed at pH 5. Stable Pickering emulsions (60% menhaden oil fraction, w/w) were successfully invented with only 0% (w/w) of ALA-CHI nanoparticles. Pickering emulsions marched superior storage, heat, and centrifugation stability. The formation of gel-like structures was sustained by rheological consequences. The viscosity and storage modulus in the frequency range of 0 to 10 Hz with a 1% strain demoed remarkable increments with increasing colloidal particle concentration or oil fraction. Increasing oil fractions from 20% to 60% (w/w) or colloidal particle absorptions 0% to 2% (w/w) can pronouncedly facilitate the inhibition of lipid oxidation, as confirmed by detecting the formation of primary and secondary oxidation products.Hybrid Composite Membrane of Phosphorylated Chitosan/Poly (Vinyl Alcohol)/Silica as a Proton Exchange Membrane.
Chitosan is one of the natural biopolymers that has been analyzed as an alternative material to replace Nafion membranes as proton change membranes. Nevertheless, unmodified chitosan membranes have limitations admiting low proton conductivity and mechanical stability.