Fig. 9. SEM images of microbial cells with 0.025 wt% ODTAB-coated 0.125 wt% shellac NPs after 4 hours incubation at pH 5.5. (A) and (B) C. reinhardtii, (C) and (D) S. cerevisiae and (E) and (F) E. coli after 4 hours incubation at pH 5.5. The shellac NPs were not loaded with BRB.