Fig. 6.

A) Schematic diagram showing the production of multiple emulsions (W1/O/W2) using the two-step emulsification procedure. Reproduced from (Bai et al., 2021). B) Confocal laser scanning micrographs of LA encapsulated in PDE after 14 days' storage under bright and fluorescence fields (I-II); Images collected under high-magnification marked with an arrow (i-iii), the images showed the oil phase in red (stained with Nile red and excited at 549 nm) and LA in blue (stained with STYO-9 and excited at 483 nm). Reproduced from (Wang et al., 2020). C) Schematic showing the encapsulation of L. dellbrueckii in multiple Pickering emulsions stabilized by β-cyclodextrin inclusion complexes. Reproduced from (Eslami et al., 2017). D) Preparation scheme of CL- and CL/HPMC-stabilized emulsion at different concentrations of HPMC. Reproduced from (Rattanaburi et al., 2019). E) Schematic showing (not to scale) the oil phase structure of HIPEs at different internal phase volume fractions. Reproduced from (Bai et al., 2021). F) (I) Particle sizes and ζ-potentials of WPI and WPI-EGCG covalent conjugates. (II) Particle size distributions, three-phase contact angles (θ), and (III) SEM images of WPI and WPI-EGCG-pH 9 covalent conjugate freeze-dried samples. Reproduced from (Qin et al., 2021).