Microencapsulation of Rosemary Essential Oil: Characterization of Particles

• Published in: Drying technology Vol. 31; no. 11; pp. 1245 - 1254
• Main Authors: Fernandes, Regiane Victória de Barros, Borges, Soraia Vilela, Botrel, Diego Alvarenga, Silva, Eric Keven, Costa, Joyce Maria Gomes da, Queiroz, Fabiana
• Format: Journal Article
• Language: English
• Published: Philadelphia Taylor & Francis Group 18-08-2013; Taylor & Francis Ltd
• Subjects: Drying; Drying agents; Encapsulation efficiency; Flavor; Gum arabic; Hygroscopicity; Inlet temperature; Inlets; Isotherms; Mathematical models; Oils & fats; Response surface methodology; Rosemary; Sorption; Spray-drying; Temperature effects; Walls
• ISSN: 0737-3937; 1532-2300
• DOI: 10.1080/07373937.2013.785432

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.