Factors determining the surface oil concentration of encapsulated lipid particles—impact of the spray drying conditions.

The impact of spray drying conditions on encapsulated rapeseed oil was investigated regarding the encapsulation efficiency (EE). The drying rate was modified by the solid content (25–55% w/w) of atomized feed droplets, the inlet temperature (140–220 °C) and relative humidity (0.12–1.57%) of the drying air. The moisture, aw, bulk and tapped density, particle size, and EE were analyzed. An accelerated drying rate due to a higher solid content and inlet temperature as well as a slower drying induced by an increased air humidity resulted in larger particle and more efficient encapsulation. A higher EE was obtained with increasing particle size which is in accordance with a theoretical EE calculated based on the particle- and oil droplet diameter. [ABSTRACT FROM AUTHOR]