pectins and titanium-dioxide

Hybrid eco-friendly nanocomposite films were fabricated by blending high-methoxyl pectin, gelatin, TiO

Topics: Animals; Curcumin; Food Packaging; Gelatin; Mice; Nanocomposites; Pectins; Salmon

A UV blocking and potentially biodegradable composite films are fabricated from flax seed mucilage and pectin with different concentrations of titanium dioxide (TiO

Topics: Calcium Chloride; Flax; Food Packaging; Pectins; Permeability

In this research, sodium alginate-pectin composite (ALG-PEC CS) and nanocomposites (NCs) films with 0.5, 1, and 2 wt% TiO

Topics: Alginates; Anti-Bacterial Agents; Nanocomposites; Pectins; Titanium

Colorectal cancer was inducted in Wister rats using titanium dioxide nanoparticles (TiO

Topics: Animals; Apoptosis; Cell Line, Tumor; Colonic Neoplasms; Curcumin; Dimethylhydrazines; Fluorouracil; Pectins; Rats; Rats, Wistar; Spectroscopy, Fourier Transform Infrared; Titanium

Covalent TiO(2)-co-pectin microspheres containing Fe(3)O(4) nanoparticles were developed through an ultrasound-induced crosslinking/polymerization reaction between the glycidyl methacrylate from vinyl groups in TiO(2) and in pectin. ζ-potentials became less negative in the nanostructured microspheres, caused by the presence of both inorganic particles in the negatively charged pectin. The nanostructured pectin microspheres showed an amoxicillin release rate slower than that of pure pectin microspheres. The proposed microspheres were found to be a sustained release system of amoxicillin in the acid medium. Furthermore, the antibiotic release may be modulated by exposition of the microspheres to a remote magnetic field. In practical terms, the nanostructured microspheres could deliver a larger proportion of their initial load to specific site of action. The cytotoxic concentrations for 50% of VERO cells (CC(50)), calculated as the concentration required to reduce cell viability by 50% after 72h of incubation, for pectin-only microspheres and nanostructured pectin microspheres were 217.7±6.5 and 121.5±4.9μgmL(-1), respectively. The obtained CC(50) values indicated acceptable cytotoxic levels for an incubation period of 72h, showing that the pectin microspheres have a great pharmacological potential for uses in biological environments, even after the introduction of both Fe(3)O(4) and TiO(2).

Topics: Animals; Chlorocebus aethiops; Drug Delivery Systems; Ferric Compounds; Humans; Magnetic Fields; Metal Nanoparticles; Microspheres; Pectins; Spectroscopy, Fourier Transform Infrared; Titanium; Vero Cells

Complex heterogeneous polysaccharides that comprise pectin were partially depolymerized by a photochemical reaction using ultraviolet light in the presence of titanium dioxide catalyst. In a period of 6h at pH 7, this UV/TiO(2) process decreased the average molecular weight of pectin from 400kDa to 200kDa. The characterization of the partially depolymerized pectin, which was fractionated by size-exclusion chromatography, was performed by (1)H NMR spectroscopy, and the spectra obtained showed that the resulting oligosaccharides and polysaccharides maintained the intact core structure of pectin. The monosaccharide content and depolymerization profile were determined by high-performance anion-exchange chromatography coupled with pulsed amperometric detection. This controlled photochemical depolymerization technique might be useful for preparation of pectin oligosaccharides as an ingredient in food and pharmaceutical products.

Topics: Chromatography, Gel; Chromatography, Ion Exchange; Electrochemistry; Hexuronic Acids; Hydrogen-Ion Concentration; Magnetic Resonance Spectroscopy; Oligosaccharides; Pectins; Photochemical Processes; Photolysis; Titanium; Ultraviolet Rays