shows SEM micrographs of the cross-sections of the films containing various essential oil concentrations. Films containing CWO and CEO show a similar microstructure. While a continuous structure was observed for the chitosan film (Fig. 5a), the presence of essential oil (Fig. 5b–d) caused a heterogeneous structure in which oil droplets were entrapped in the continuous carbohydrate network. The number and size of the lipid droplets were increased with the essential oil concentration. Little creaming was observed in the emulsified films at 10% and 20% w/w essential oil concentration, probably due to the reduction of oil droplet mobility induced by the highly viscous effect of chitosan, which, increased when drying progressed [52]. Nevertheless, the great oil phase concentration(30% w/w) contributes to visible creaming in the micrograph; it was possibly due to the high concentration of essential oil facilitate the aggregation of lipid, which led to flocculation of essential oil in the polymer.4.