Open AccessIdentification of key factors determining the surface oil concentration of encapsulated lipid particles produced by spray drying
Author(s) -
Annika Linke,
Tobias Balke,
Reinhard Kohlus
Publication year - 2018
Language(s) - English
Resource type - Conference proceedings
DOI - 10.4995/ids2018.2018.7739
Subject(s) - oil droplet , emulsion , materials science , spray drying , particle size , relative humidity , chemical engineering , humidity , viscosity , chromatography , composite material , chemistry , thermodynamics , physics , engineering
Potential factors leading to surface oil were investigated by analyzing the impact of emulsion properties, atomization and drying conditions separately. An increased oil load, droplet size and in particular the size of droplet aggregates led to significant more surface oil. Increasing the viscosity, inlet temperature and relative humidity resulted in larger particles with a higher encapsulation efficiency. The results indicate that the probability of oil droplets being in contact with the particle surface determines the amount of surface oil. Oil diffusion towards the surface was excluded due to the short residence times and high viscosities. Keywords: microencapsulation; encapsulation efficiency; emulsion properties; atomization; drying conditions