نتایج جستجو برای: polyol method
تعداد نتایج: 1631545 فیلتر نتایج به سال:
Sorbitol dehydrogenase was isolated from human brain and purified 690-fold, giving a final specific activity of 11.1 units/mg of protein. The enzyme preparation was nearly homogeneous, but was unstable at most temperatures. It exhibited a broad pH optimum of 7.5-9.0 in the forward reaction (i.e. sorbitol -+fructose), and of 7.0 in the reverse reaction (i.e. fructosesorbitol). Substrate-specific...
The aim of the present work was to study physicochemical, textural and sensory properties biscuits prepared by replacing sucrose with rare sugar (D-psicose) and/or polyols (sorbitol, xylitol) at 25% or 50%. results showed that increasing D-psicose replacement resulted in lower moisture content, darker less yellow, thicker biscuits. However, opposite effects were observed polyol substitute textu...
The geometry of metal nanoparticles greatly affects the properties of the localized surface plasmon resonance and surface-enhanced Raman scattering. The synthesis of metal nanoparticles with controllable geometry has thus attracted extensive attentions. In this work, we report a modified polyol synthesis approach of silver (Ag) nanocubes through tuning the concentration of bromide ions (Br(-) i...
Carbohydrates with high glycaemic index are proposed to promote the development of obesity, insulin resistance and fatty liver, but the mechanism by which this occurs remains unknown. High serum glucose concentrations are known to induce the polyol pathway and increase fructose generation in the liver. Here we show that this hepatic, endogenously produced fructose causes systemic metabolic chan...
Enhancement of visible-light photocurrent generation by sol-gel anatase TiO2 films was achieved by binding small polyol molecules to the TiO2 surface. Binding ethylene glycol onto the surface, enhancement factors up to 2.8 were found in visible-light photocurrent generation experiments. Density functional theory calculations identified midgap energy states that emerge as a result of the binding...
Aldose reductase (AR) has been implicated in the etiology of diabetic complications. Under diabetic conditions, the elevated vascular glucose level causes an increased flux through the polyol pathway, which induces functional and morphological changes associated with secondary diabetic complications such as cataract, neuropathy, and nephropathy. Oxidative stress, antioxidants, and the polyol pa...
This work describes the different durations of surface confinement of adhered mammalian cells by monolayers comprised of enantiomers of bio-inert polyol-terminated alkanethiols. Enhanced resistance to protein adsorption and cell adhesion is obtained on monolayers formed by a racemic mixture of the enantiomeric alkanethiols.
Transetherification on polyols involving intra- and intermolecular nucleophilic substitutions is reported. Di- or trialkoxide formation of propane-1,3-diol or 2-(hydroxymethyl)propane-1,3-diol derivatives by NaH triggers the reaction via oxetanes formation, where the order to add NaH and a polyol significantly influences the yields of products. It was demonstrated that the protective group on t...
In this work, the photocatalytic activity and sorption capacity of heterogeneous structures AgCl/h-BN obtained by polyol method were studied in comparison with initial micron-sized h-BN powder. The chemical phase composition, as well surface microstructure, analyzed scanning electron microscopy, energy dispersive spectroscopy, X-ray analysis, photoelectron spectroscopy. High ability AgCl/BN rea...
A novel approach to provide, thermally sensitive neutral solutions based on chitosan/polyol salt combinations is described. These formulations possess a physiological pH and can be held liquid below room temperature for encapsulating living cells and therapeutic proteins; they form monolithic gels at body temperature. When injected in vivo the liquid formulations turn into gel implants in situ....
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