could lead to coabsorption on the Oil/water iiitertace and improved emulsion stability (Laplante and others 2005). Additionally, high viscosity could decrease the sedimentation coefficient of the emulsion droplets increasing the stability. Encapsulation efficiency increased from 61.6% to 89.290 with increasing solids concentration up to 3006 (Figure 1b). Encapsulation efficiency of anhydrous milk fat also showed an increasing trend with increasing solids concentration from 1000 to 30% using whey protein isolate as the barrier material (Young and others 1993). In the current work, the encapsulation efficiency and yield signiflcantly decreased when the solids concentration was higher than 3000 (Figure 1b). Higher solids concentrations decreased fish oil migration to the surface at early stages of the drying, thus improved the encapsulation efficiency. However, even higher viscosity of emulsions interfered with the atomization process and led to the formation of more elongated and larger droplets that adversely affected the drying rate (Tonon and others 2011). Too viscous emulsions may cause wall sticking and even clogging problems in the dryer’s tubes further decreasing the encapsulation yield. The trend was similar to that reported by Peng and others (2011) using whey proteins as the barrier material.
Effect of ratio of oil to barrier materials on characteristics H: the microcapsules
The emulsion viscosity and stability decreased with an increasig ratio of oil to barrier materials (P < 0.05) (Figure 23).