The stability of crude oil droplets formed by adding chemical dispersants can be considerably enhanced by the use of the biopolymer, hydrophobically modified chitosan. Turbidimetric analyses show that emulsions of crude oil in saline water prepared using a combination of the biopolymer and the well-studied chemical dispersant (Corexit 9500A) remain stable for extended periods in comparison to e...

The current paper focuses on the preparation and some characteristics of viscoelastic hydrogels, ViscoGelsTM, made from chitosans having a random acylation pattern. Three different chitosan batches with a high fraction of acetylation were selected based on their Mw, and the impact of degree of cross-linking on these chitosan samples has been studied with respect to the properties of the final h...

Recent research has identified genipin as a promising natural crosslinking agent for biocompatible hydrogels as genipin is significantly less cytotoxic than current synthetic crosslinking agents, such as glutaraldehyde. Conveniently, fluorophores can be produced when genipin crosslinks. In this study, fluorescence intensity measurements of genipin crosslinked chitosan-poly(vinyl pyrrolidone) hy...

Rapid postharvest losses and quality deteriorations in pineapple are major challenges to growers handlers. Chitosan-based coatings on fruit surfaces have gained importance recent years enhance shelf life of the fruits. In this study, aloe vera gel was added as a natural antioxidant chitosan-based composite coating containing ZnO nanoparticles. The developed formulation applied surface freshly h...

Liposomal complexes with mucoadhesive polymers, e.g., mannosylated chitosan, are considered as prospective antituberculosis drug delivery systems. The properties of such can be critically affected by the charge and phase state liposomes. aim our work was to study interaction chitosan liposomes various compositions identify key patterns this process. We tracked titrating an increasing base-molar...

The gelatin/chitosan (GEL/CTS, GC) membranes have been fabricated well by a simple in-situ method. as-prepared GC were characterized morphological surface (scanning electron microscopy, SEM), chemical (Fourier-transform infrared spectroscopy, FT-IR), crystallinity (X-ray diffraction, XRD), thermal (thermal gravimetric analysis, TGA), mechanical (tensile test), hydrophilic (water contact angle),...

Abstract The cleaning or removal of manganese stains on Cultural Heritage has not been much tested successful so far. aim this article was to assess a new green gel for Mn-rich black-blue different substrates. were characterized at optical and chemical level through colour-related data, microscope, FTIR, XRF XPS. Mn-stained granite found historical churches Vila Real (North Portugal) glass jars...

A chitosan derivative which has a structure that approximates N-phthaloyl-3,6-di-Oacetylchitosan (AcPhCh) was used to investigate the thermal behavior of lyotropic gel liquid crystalline phases in dimethylsulfoxide (DMSO). A distinct gel-sol transition in addition to a liquid crystal-liquid (or chiral nematic-isotropic) transition was observed in the AcPhCh-DMSO system by differential scanning ...

Chitosan was prepared from crab shell. Different derivatives of chitosan e.g. phosphate, cyanoethyl and carboxymethyl chitosan are prepared. Molecular structure of chitosan and its derivatives was fallowed by infrared spectroscopy. A new band at 1715cm -1 (carboxyl group), at 2253cm -1 (cyano group) and at 1200cm -1 for (c-o-p) in spectra of carboxymethyl chitosan, cyanoethyl chitosan and chito...

The therapeutic potential of antisense oligonucleotides (ASODN) is primarily dependent upon its safe and efficient delivery to specific cells overcoming degradation and maximizing cellular uptake in vivo. The present study focuses on designing mannosylated low molecular weight (LMW) chitosan nanoconstructs for safe ODNs delivery by macrophage targeting. Mannose groups were coupled with LMW chit...