3.4. Optical microscopy imaging and particle size distribution
The microscopic images of the emulsions with soybean oil just after the homogenization are shown in Fig. 7. It is noted that emulsions prepared with PGPR are composed of spherical small droplets. On the other hand, the systems composed of Span 80 presents a different structure than an emulsion, with some non-spherical particles. Similar appearance was observed at both W:O ratios. In the case of water–soybean oil systems with lecithin, some big gel-like structures were formed in the continuous phase. Those structures agglomerated during the observation of the microscopy image, showing the high instability of the system