In this Issue
In this issue
Degradable polyurethane nanoparticles containing vegetable oils
Valério and colleagues describe the formation of degradable polyurethane nanoparticles using isophorone diisocyanate, castor oil, and poly(ε-caprolactone) as monomers and containing vegetable oils including açaí oil and crodamol GTCC. In the first step, a miniemulsion (colloidal dispersion of relatively stable droplets 50-500 nm in size) is formed with the help of a surfactant such as Tween or SDS and sonication. Polymerizations are then carried out in the miniemulsion at 70°C. There is no need to use organic solvents. It is also demonstrated that the particles can be degraded under physiological conditions.
Valério, A. et al. Degradable polyurethane nanoparticles containing vegetable oils. Eur. J. Lipid Sci. Technol. 2014, 116, 24–30.
Reduction of high oleic sunflower oil to glyceryltrioleyl ether
Glyceryltrialkyl ethers, which are typically less viscous and have lower melting points than the corresponding triglycerides, are of interest for industrial applications including cosmetics and lubricants. Biermann and Metzger investigated the reduction of “high oleic” sunflower oil to the corresponding triethers. The triglycerides (triesters) were selectively reduced to triethers under mild conditions via hydrosilylation using indium and gallium halides as catalysts. Hundred percent conversion of the substrate was obtained after a short reaction time, yielding 80% of glyceryltrioleyl ether.
Biermann, U. and Metzger, J. Reduction of high oleic sunflower oil to glyceryltrioleyl ether. Eur. J. Lipid Sci. Technol. 2014, 116, 74–79.
Lipase-catalyzed reactions using deep eutectic solvents
Deep eutectic solvents (DES) can replace conventional organic solvents in many reactions. Here Durand and colleagues used aqueous dilutions of DES derived from choline chloride combined with urea for lipase-catalyzed reactions of polar substrates. The authors optimized lipase-catalyzed alcoholysis reactions, having synthesized high yields of a wide range of lipophilic derivative compounds of phenolic acids, and in addition they showed how the individual components of DES mixtures contribute to the functional properties of the solvents.
Durand, E. et al. Towards a better understanding of how to improve lipase-catalyzed reactions using deep eutectic solvents based on choline chloride. Eur. J. Lipid Sci. Technol. 2014, 116, 16–23.