4A. Effect of filter composition on AChE encapsulation percentage: encapsulated enzymatic activity/ total activity. 4B. Enzyme recovery percentage: Total enzymatic activity after extrusion/total enzymatic activity. The filter used were: Polycarbonate filter specially designed for liposome extruder (line 1), Cellulose Acetate (line 2), Regenerated Cellulose (line 3), Nylon (line 4), PTFE (polytetrafluoroethylene) (line 5) and Cellulose Acetate with a Glass Fiber premembrane (line 6).