2.4. Encapsulation Efficiency Measurement First, 0.5 mL of the liposomes were placed in a centri- fuge tube with 1 mL of acetone since phosphatidylcho- line is insoluble in this solvent. The samples were cen- trifuged at 5000 g for 30 min at 3˚C, separating into two phases. The supernatant containing the non-encapsulated sample was withdrawn and placed in an oven at 60˚C until complete evaporation of the solvent. The remaining dried stuff was resuspended with 5 mL distilled water and the concentration was determined through the phenol method [24]. To determine the total phenol present in the sample, a 0.5 mL aliquot of the initial sample was with- drawn and 1 mL of 0.06% Triton X-100 was added. The equipment was then homogenized in a vortex (Phoenix AP56) until complete solubilization of phosphatidylcho- line. The encapsulation efficiency (EE) was calculated as shown in Equation (1): ( ) ( ) inside inside outside EE % phenols phenols phenols 100 = + ×