Optimization of spray-drying operating conditions on the microencapsulation of vegetable oil

ROCCIA, PAOLA; MARTÍNEZ, MARCELA LILIAN; LLABOT, JUAN MANUEL; MAESTRI, DAMIAN; RIBOTTA, PABLO DANIEL

Congreso; IV Congreso Internacional de Ciencia y Tecnología de los Alimentos; 2012

The aim of this study was to maximize the yield of vegetable oil (AV) microencapsulated using the response surface methodology (MSR). The process was carried out on a mini spray dryer using hydroxypropylmethylcellulose (3%) and maltodextrin (6%) as wall materials. A ratable central composite design with four factors (independent variables) and five levels was used to study the optimization process by response surface analysis. The independent variables considered were drying air inlet temperature (A), ° C; atomizing air flow (B), L/h; feed rate (C), %; and aspirator (D),% while the response variables measured were solid yield (SR,% solid material recovered in the dryer), moisture content (H, % of moisture SR), surface oil (AS, AV% of the surface of the microcapsule) and encapsulation efficiency (EE, AV% retained inside of the microcapsule). The results showed that the SR varied between 5.44% and 39.88%, and was affected by all process variables. The optimization procedure suggested that a combination of A: 163 °C, B: 279 L/h, C: 10%, D: 100% were the best processing combination to maximize %SR to 41.94%.