Surface oil content of the freeze dried capsules was determined according to the method of Liu, Low, and Nickerson (2010). Briefly, about 1 g of microcapsules was dispersed in 30 mL of hexane and vigorously shaken for 30 s. The solvent including capsules were then filtered through a Whatman Gr. 1 paper into a 100 mL beaker. The beaker and solvent were left in a fume hood overnight to allow for the evaporation of the solvent. The surface oil of the microcapsules was determined gravimetrically following heating of the beaker at 102 °C for 30 min to remove residual solvent and cooling in a desiccator for 20 min. The total oil content was assumed to be at the levels added (i.e., 10, 20, 30%). Entrapment efficiency (EE) was then calculated from the following equation