Suchergebnisse

| openaire: EC/H2020/788489/EU//BioElCell Funding Information: This material was partly based on work supported by the National Institute of Food and Agriculture, United States Department of Agriculture (USDA), Massachusetts Agricultural Experiment Station (Project 831), and USDA, Agriculture and Food Research Initiative (AFRI) Grants (2016-08782 and 2020-03921). The authors also acknowledge support by the Canada Excellence Research Chair Initiative, the Canada Foundation for Innovation (CFI), and the European Research Council under the European Union's Horizon 2020 Research and Innovation Program (ERC Advanced Grant Agreement 788489, "BioElCell"). Publisher Copyright: © 2021 American Chemical Society. ; Emulsion technology has been used for decades in the food industry to create a diverse range of products, including homogenized milk, creams, dips, dressings, sauces, desserts, and toppings. Recently, however, there have been important advances in emulsion science that are leading to new approaches to improving food quality and functionality. This article provides an overview of a number of these advanced emulsion technologies, including Pickering emulsions, high internal phase emulsions (HIPEs), nanoemulsions, and multiple emulsions. Pickering emulsions are stabilized by particle-based emulsifiers, which may be synthetic or natural, rather than conventional molecular emulsifiers. HIPEs are emulsions where the concentration of the disperse phase exceeds the close packing limit (usually >74%), which leads to novel textural properties and high resistance to gravitational separation. Nanoemulsions contain very small droplets (typically d < 200 nm), which leads to useful functional attributes, such as high optical clarity, resistance to gravitational separation and aggregation, rapid digestion, and high bioavailability. Multiple emulsions contain droplets that have smaller immiscible droplets inside them, which can be used for reduced-calorie, encapsulation, and delivery purposes. This new generation of ...

| openaire: EC/H2020/788489/EU//BioELCell Funding Information: This work was supported by the Canada Excellence Research Chair initiative, the European Research Council under the European Union's Horizon 2020 research and innovation program (ERC Advanced grant no. 788489, "BioElCell"), and the Canada Foundation for Innovation (CFI). This work was also part of the Academy of Finland's Flagship Programme (Competence Center for Materials Bioeconomy, FinnCERES) under project no. 318890 and 318891. Publisher Copyright: © Copyright: Copyright 2021 Elsevier B.V., All rights reserved. ; We consider the variables relevant to adsorption of renewable nanoparticles and stabilization of multiphase systems, including the particle's hydrophilicity, electrostatic charge, axial aspect, and entanglement. Exploiting the complexation of two oppositely charged nanopolysaccharides, cellulose nanofibrils (CNFs) and nanochitin (NCh), we prepared CNF/NCh aqueous suspensions and identified the conditions for charge balance (turbidity and electrophoretic mobility titration). By adjusting the composition of CNF/NCh complexes, below and above net neutrality conditions, we produced sunflower oil-in-water Pickering emulsions with adjustable droplet diameters and stability against creaming and oiling-off. The adsorption of CNF/NCh complexes at the oil/water interface occurred with simultaneous partitioning (accumulation) of the CNF on the surface of the droplets in net negative or positive systems (below and above stochiometric charge balance relative to NCh). We further show that the morphology of the droplets andsize distribution were preserved during storage for at least 6 months under ambient conditions. This long-term stability was held with a remarkable tolerance to changes in pH (e.g., 3-11) and ionic strength (e.g., 100-500 mM). The mechanism explaining these observations relates to the adsorption of the CNF in the complexes, counteracting the charge losses resulting from the deprotonation of NCh or charge screening. Overall, CNF/NCh complexes and the respective interfacial nanoparticle exchange greatly extend the conditions, favoring highly stable, green Pickering emulsions that offer potential in applications relevant to foodstuff, pharmaceutical, and cosmetic formulations. ; Peer reviewed

We report on the formation of water-in-water liquid crystal emulsions with permeable colloidal assemblies. Rodlike cellulose nanocrystals (CNC) spontaneously self-assemble into a helical arrangement with the coexistence of nonionic, hydrophilic polyethylene glycol (PEG) and dextran, whereas the two polymer solutions are thermodynamically incompatible. Stable water-in-water emulsions are easily prepared by mixing the respective CNC/polymer solutions, showing micrometric CNC/PEG dispersed droplets and a continuous CNC/dextran phase. With time, the resulting emulsion demixes into an upper, droplet-lean isotropic phase and a bottom, droplet-rich cholesteric phase. Owing to the osmotic pressure gradient between PEG and dextran phases, target transfer of cellulose nanoparticles occurs across the water/water interface to reassemble into a liquid crystal-in-liquid crystal emulsion with global cholesteric organization. The observed structural, optical, and temporal evolution confirm that the colloidal particles in the two immiscible phases experience short-range interactions and form long-range assemblies across the interface. ; This work was a part of the Academy of Finland's Flagship Programme under Project Nos. 318890 and 318891 (Competence Center for Materials Bioeconomy, FinnCERES). The authors also acknowledge support by the Canada Excellence Research Chair initiative, the Canada Foundation for Innovation (CFI), and the European Research Council under the European Union's Horizon 2020 research and innovation program (ERC Advanced Grant Agreement No. 788489, "BioElCell"). J.E. acknowledges the i-LINK1188 collaborative project, the AIE founding agency and the "Grupo de Nanotecnología Farmacéutica" UB-CSIC Associated Unit. Polarized CLSM imaging was performed in the LSI IMAGING facility of the Life Sciences Institute of the University of British Columbia using infrastructure funded by BC Knowledge Development Fund as well as a Strategic Investment Fund (Faculty of Medicine, University of British Columbia). ; Peer reviewed