![Sample our Engineering & Technology journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5933/TOC-Subject-Sample-2021-Engineering-Tech.jpg"})
Abstract
This study evaluated the influence of wall material concentration (10–30%), inlet temperature (135–195°C), and feed rate (0.5–1.0 L · h−1) on the properties of rosemary oil microencapsulated by spray-drying, with gum arabic as carrier. Powder recovery, surface oil, oil retention, and hygroscopicity varied from 17.25%–33.96%, 0.03%–0.15%, 7.15%–47.57%, and 15.87%–18.90%, respectively. The optimized conditions were determined to be a wall material concentration of 19.3%, an inlet air temperature of 171°C, and a feed flow rate of 0.92 L · h−1. At this condition, particles presented no fissures and the compositions of pure and microencapsulated oil were similar. The sorption isotherms could be described by the GAB model.
ACKNOWLEDGMENT
The authors thank FAPEMIG (Minas Gerais State Foundation for Research Development, Brazil) for the financial support.
Notes
X1-wall material concentration, X2-inlet air temperature, X3-feed flow rate.
ns: nonsignificant (p > 0.05).
*Significant at 5% probability.
Xeq: equilibrium moisture content (g 100 g−1 dry powder); Xm: monolayer moisture content (g 100 g−1 dry powder); C, K: model constants related to monolayer and monolayer properties; aw: water activity; a,b: model parameters; E: mean relative deviation modulus; R2: coefficient of determination.