The effect of nanoemulsion properties produced from high pressure homogenization on properties of microcapsules resulted from microencapsulation process by spray drying technique

In this paper, the effect of nanoemulsion produced from high pressure homogenization process on properties of microcapsuls resulted from microencapsulation by spray drying was studied. For this purpose, oil-in-water emulsions containing 5% limonene (wall material basis) in a solution of 10, 15 and 20% whey protein concentrate (WPC) using high pressure homogenizer at pressures of 20, 50, 80 and 110 MPa was prepared and their quality attributes such as mean diameter of droplets and size distribution, polydispersity index and viscosity was studied as a function of wall material concentration and pressure of homogenization. Moreover, the influence of these parameters on the properties of spray-dried microcapsules such as particle size, percent of oil retention, encapsulation efficiency and also on the quality indexes of reconstituted emulsions was evaluated. The results indicated that an increase in the pressure of homogenization and wall material concentration increase the size of microcapsules and efficiency of microencapsulation while decrease surface oil content of microcapsules. However, increasing the concentration of WPC and homogenization time of fresh emulsions decreased significantly the difference between particle size of fresh and reconstituted emulsions.