Microencapsulation of rosemary essential oil: characterization of particles

• Autor(a) principal: Fernandes, R. V. de B.
• Data de Publicação: 2013
• Outros Autores: Borges, Soraia Vilela, Botrel, D. A., Silva, E. K., Costa, J. M. G. da, Queiroz, F.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFLA
• Texto Completo: http://www.tandfonline.com/doi/abs/10.1080/07373937.2013.785432#.VH8Qn9LF-dI; http://repositorio.ufla.br/jspui/handle/1/4731
• topic: Encapsulation efficiency; Flavor; Gum arabic; Response surface methodology; Spray-drying

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.