Polyglycerol synthesis | warrgethecapbuinieridyluftdicas
Solvent-free polyglycerol polyricinoleate synthesis mediated by lipase from Rhizopus arrhizus
CA1185610A - Polyglycerol ester synthesis - Google …
The enzymatic method for synthesising polyglycerol polyricinoleate (PGPR), a food additive named E-476, was successfully carried out in the presence of immobilised Rhizopus oryzae lipase in a solvent-free medium. The great advantage of using the commercial preparation of R. oryzae lipase is that it is ten times cheaper than the commercial preparation of R. arrhizus lipase, the biocatalyst used in previous studies. The reaction, which is really a reversal of hydrolysis, takes place in the presence of a very limited amount of aqueous phase. Immobilisation of the lipase by physical adsorption onto an anion exchange resin provided good results in terms of activity, enzyme stability and reuse of the immobilised derivative. It has been established that the adsorption of R. oryzae lipase on Lewatit MonoPlus MP 64 follows a pseudo-second order kinetics, which means that immobilisation is a process of chemisorption, while the equilibrium adsorption follows a Langmuir isotherm. The use of this immobilised derivative as catalyst for obtaining PGPR under a controlled atmosphere in a vacuum reactor, with a dry nitrogen flow intake, allowed the synthesis of a product with an acid value lower than 6 mg KOH/g, which complies with the value established by the European Commission Directive. This product also fulfils the European specifications regarding the hydroxyl value and refractive index given for this food additive, one of whose benefits, as proved in our experiments, is that it causes a drastic decrease in the viscosity (by 50 %) and yield stress (by 82 %) of chocolate, comparable to the impact of customary synthesised PGPR.
Dendritic core-double-shell architectures consisting of a hyperbranched polyglycerol core, a long aliphatic hydrophobic inner shell, and hyperbranched polyglycerol-based hydrophilic outer shell have been synthesized and characterized. They have been prepared from simple building blocks by applying an anionic ring-opening polymerization protocol. The obtained, well-defined, globular, nanometer-sized architectures possess the ability to host polar and nonpolar guest molecules in water. The polymer−guest molecule complexes were characterized by UV and DLS measurements. Unimolecular transport behavior was observed for nonpolar guest molecules with transport capacities of 1.5 guest molecules per nanocarrier and particle sizes of 7−10 nm. However, for polar guest molecules, the formation of uniform aggregates with a diameter of 70 nm and transport capacities up to 10 guests per nanocarrier was detected.
Synthesis and characterization of hyperbranched polyglycerol ..
A magnetic nanoparticle supported hyperbranched polyglycerol catalyst was prepared readily from inexpensive starting materials in aqueous medium that catalyzed the synthesis of 4H-benzo[b]pyran under solvent-free conditions at room temperature. X-ray diffraction, transmission electron microscopy, thermal gravimetric analysis, vibrating sample magnetometry, and selected-area electron diffraction were employed to characterize the properties of the synthesized catalyst. Its high catalytic activity and ease of recovery from the reaction mixture using an external magnet, and the possibility of reusing several times without significant loss of performance are additional eco-friendly attributes of this catalytic system.
Synthesis and Properties of Novel Polyglycerol …
The enzymatic method for synthesising polyglycerol polyricinoleate ..
Previous studies on the synthesis of polyglycerol from glycerol, ..
Eco-Materials Processing and Design XIV: Synthesis of Polyglycerol Fatty Acid Ester for Insulating Oil
Green catalytic synthesis of polyglycerol over green carbon
Magnetic nanoparticle supported hyperbranched polyglycerol catalysts for synthesis of 4H-benzo[b]pyran.
Hyperbranched polyglycerol synthesis essay - Black …
Synthesis, Characterization, and Magnetic Resonance Evaluation of Polyglycerol-Functionalized Detonation Nanodiamond ..
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