Therefore, this review reports recent literature (2018–2021) on the use of comparatively safer biodegradable polysaccharide particles, proteins, lipids and combinations of these species in various Pickering emulsion formulations. Surfactant-free Pickering emulsions can be stabilized by the UV-filter nanoparticles for the manufacture of sunscreen products. 1 Different from the thermodynamically stable micro-emulsions, of which the droplets are smaller than 100 nm, macro-emulsions are thermodynamically unstable and have larger droplets in the range of 0.110 m. Pickering emulsion characterization, such as the average droplet diameter, oil-to-water ratio and p article concentration and wett-ability, have been added to those typically assessed in catalytic reactions: reaction conversion, ec iency, yield and selectivity. Oil-in-water (O/W) Pickering emulsions were prepared using spherical, rod-like, and thread-like mesoporous silica nanoparticles (MSNPs) in combination with the cationic surfactant dodecyltrimethylammonium bromide (DTAB) as a stabilizer. Despite a lower viscosity, the obtained Pickering emulsion was stable and exhibited a photoprotective effect similar to the corresponding surfactant-based sunscreen cream with an in vitro SPF of about 45. The three-phase contact angle is the main parameter for evaluating the performance of solid particles. However, synthetic surfactants are not always a suitable choice in some applications, especially in pharmaceuticals, food and cosmetics, due to toxicity and lack of compatibility and biodegradability. 1 Introduction Macro-emulsions are mixtures of two immiscible liquids (usually water and an organic solvent). Pickering emulsion is mainly formed by the adsorption of solid particles with certain wettability to the oilwater interface, which would form a single-layer or multi-layer film of solid particles. Pickering emulsions stabilized by rice bran protein at a certain oil phase ( 0.6) were fabricated and characterized. Usually, emulsions are a dispersion system, where synthetic surfactants or macromolecules stabilise two immiscible phases (typically water and oil phases) to prevent coalescence. In recent years, the demand for non-surfactant based Pickering emulsions in many industrial applications has grown significantly because of the option to select biodegradable and sustainable materials with low toxicity as emulsion stabilisers. Rheological behavior analyses suggested that salt-induced emulsions had higher viscoelasticity and maintained a stable gel-like structure.
0 kommentar(er)
