Abstract Microparticles with different essential oil concentrations 0, 75, 150, 225 and 300 gkg−1, (g of essential oil per kg of microparticles), were produced by dispersing the essential oils within a… Click to show full abstract
Abstract Microparticles with different essential oil concentrations 0, 75, 150, 225 and 300 gkg−1, (g of essential oil per kg of microparticles), were produced by dispersing the essential oils within a hydrogenated vegetable fat matrix and forming spherical solid particles by spray-chilling. Size distribution, flowability, surface structure, essential oil recovery, melting properties and crystallinity of the microparticles were determined. With over 225 gkg−1 essential oil the microparticle surface became stickier, their flowability was reduced and the size distribution broadened. Gas chromatography showed that the essential oil recovery was always above 85% v/v. The surface structure of the microparticles was strongly affected by the essential oil concentration being smooth (225 gkg−1), comprising round-shaped dumps (300 gkg−1) or showing fat blooming (0, 75, 150 gkg−1). With essential oil, the formation of the β-polymorphic form of the triglycerides was supported leading to changes in the melting behaviour and the crystalline structure.
               
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