Influence of the spray drying operating conditions on the estimated drying kinetics of emulsion single droplets and the properties of microencapsulated chia oil

The main objective of this research was to study the chia oil microencapsulation process in a co-current spray dryer. First, the effects of drying air inlet temperature and volumetric feed rate on the air temperature along the dryer, solid yield, physical properties of powders, and the estimated dro...

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Bibliographic Details
Published in:Powder technology 2021-05, Vol.383, p.302-317
Main Authors: Bordón, M. Gabriela, Alasino, Noelia P.X., Martínez, Vanina, Gauna Peter, Regina, Iturralde, Ramiro, Ribotta, Pablo D., Martínez, Marcela L.
Format: Article
Language:English
Subjects:
Air intakes
Air temperature
Chia seed oil
Dependent variables
Droplets
Drying
Estimated single droplet drying
Evaporation
Evaporation rate
Feed rate
Global optimization
Inlet temperature
Microencapsulation
Moisture content
Multiple response optimization
Oil
Physical properties
Salvia columbariae
Spray drying
Water content
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Summary:The main objective of this research was to study the chia oil microencapsulation process in a co-current spray dryer. First, the effects of drying air inlet temperature and volumetric feed rate on the air temperature along the dryer, solid yield, physical properties of powders, and the estimated droplet evaporation time were assessed. Second, the evaporation time was predicted by means of a simple fundamental model, based on evaporation in still air and the constant rate period. Third, a global optimization of drying process conditions was performed. The main results showed that a uniform air temperature was found inside the dryer for all the process conditions, evidencing a well-mixed chamber. The estimated values of droplet evaporation times were between 1.23 and 2.55 s. Strong correlations between evaporation times and physical properties of powders (moisture content, surface oil content and encapsulation efficiency) were found. Finally, the process condition that simultaneously optimized dependent variables was 130 °C x 10 mL/min. [Display omitted] •Chia oil was encapsulated by complex coacervation and spray drying.•A design of experiments was performed in a short-form spray dryer.•The effects of air inlet temperature and volumetric feed rate were analyzed.•Droplet evaporation time was calculated as function of air temperature and feed rate.•Strong correlations between evaporation times and physical properties of powders.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2021.01.030