Pickering emulsions stabilized by hydrophobically modified hemp powders: the effect of formula compositions on emulsifying capability and stability

Abstract

The effect of formula compositions on emulsifying capacity and stability of Pickering emulsions (PEs) stabilized by modified hemp powders (HPs) were investigated, including HP concentration, oil/water (o-w) ratio, oil types, aqueous electrolyte concentration and the addition of different surfactants. The emulsifying capacity was characterized by photographs and microphotographs. The stability of PEs was characterized by centrifugal acceleration test and emulsion index (EI). The results indicated that the particle size of PEs decreased, and the stability enhanced with increasing amounts of modified HPs. This indicated that the modified HPs were not only adsorbed onto the O/W interface, but also participated in the formation of a three-dimensional network structure. The moderate o-w ratio was of benefit for obtaining PEs with good stability. However, the electrolyte concentration had a slight effect on the emulsifying capacity and the stability of PEs, and the influence of surfactants varied depending on the type.