Preparation and release mechanism of lavender oil microcapsules with different combinations of coating materials

• Published in: Flavour and fragrance journal Vol. 35; no. 2; pp. 157 - 166
• Main Authors: Zhang, Rui, Huang, Liyun, Xiong, Xiaomei, Qian, Michael C., Ji, Hongbing
• Format: Journal Article
• Language: English
• Published: Chichester Wiley Subscription Services, Inc 01.03.2020
• Subjects: Alcohols; beta-cyclodextrin; Binary mixtures; Chemical industry; Chitosan; coatings; Cyclodextrins; Diffusion; Drying; Drying oils; Encapsulation; Formulations; Gelatin; gum arabic; Lavandula; Lavender oil; Microcapsules; Microencapsulation; Morphology; oils; particle size; Polyvinyl alcohol; release mechanism; Scanning electron microscopy; Sodium; sodium caseinate; Spray drying; β-Cyclodextrin
• ISSN: 0882-5734; 1099-1026
• DOI: 10.1002/ffj.3547

The aim of the work was to control morphology and release of lavender oil (LO) microcapsules produced using spray drying through different combination of coating materials (gum acacia, sodium caseinate, gelatin, chitosan, β‐cyclodextrin and polyvinyl alcohol). In addition, the properties of LO microcapsules including encapsulating efficiency (EE), loading capacity, mean particle size and morphology were characterized. Results displayed that the ternary formulations showed higher EE than the pure and binary mixtures; meantime, employment of pure gum acacia indicated the worse encapsulation efficiency. Images from scanning electron microscopy (SEM) showed that morphology of microcapsules has better sphericity because of the presence of polyvinyl alcohol, which illustrated that polyvinyl alcohol might be contributed to surface modification of particles. Furthermore, the release mechanism was described as two stages: burst release and diffusion. And four release models were mainly used to reveal the release mechanism of microcapsules in diffusion process. In most cases, the release of LO microcapsules was dominant by Fickian diffusion except particles prepared from gum acacia—polyvinyl alcohol and gum acacia—sodium caseinate—polyvinyl alcohol. Morphology and release of Lavender oil (LO) microcapsules produced could be controlled using spray drying through different combination of coating materials. Morphology of microcapsules has better sphericity because of presence of polyvinyl alcohol, which illustrated that polyvinyl alcohol might be contributed to surface modification of particles; the release mechanism was illustrated as burst release and diffusion. A better understanding of this knowledge will be helpful for preparation of controllable microcapsules via tailoring the combination of wall materials.