Preparation of Pickering emulsion stabilized by lauroyl lysine

Abstract In this paper, the effect of Nε-lauroyl lysine (LL) on stabilizing W/O Pickering emulsions was investigated, and the effect of crystallization temperature on the particle size of LL was explored. The Pickering emulsion was prepared with LL as particle emulsifier, and the effects of homogenization rate, emulsification temperature, particle concentration, oil-water volume ratio and other factors on the preparation of emulsion were discussed. The results showed that the LL particles were the smallest for a crystallization temperature of 30 °C with a size of (1.3 ± 0.2) µm. The oil-water-LL contact angle was 142.9° ± 1.6°, and the prepared emulsion was of W/O type. The most stable emulsions were obtained under the following conditions: homogenization rate = 11,000 r min−1, emulsification temperature = 20 °C, particle concentration = 2 wt%, oil-water volume ratio = 1:1. In addition, LL showed good tolerance to the aqueous phases with different pH values. The LL-stabilized emulsion system proved to be stable over the long term in the stand tests.