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

Abstract

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.

Chitosan microcapsules: Methods of the production and use in the textile finishing

“…94,95 The advantage of combining GA and CH is evident in the study of Zhang et al which evaluated the encapsulation of lavender oil using GA and other materials (sodium caseinate, gelatin, CH, β-cyclodextrin, and PVA). 96 The employment of pure GA resulted in an encapsulation efficiency of around 20% while GA-CH microcapsules presented an encapsulation efficiency of 31%. The loading capacity and the release rate were also improved for the GA-CH combined microcapsule.…”

Glutathione-Responsive Pyraclostrobin-Loaded Polyurea Microcapsules for Their Intelligent Controlled Release

“…Previous research has reported that the encapsulation of pesticides into polymeric carriers could achieve continuous and stable release of active ingredients, which provided enhanced efficacy and reduced the impacts on the environment. − The microcapsules have many advantages compared to traditional pesticide formulations, which include lower toxicity and environmental pollution and higher storage stability. , Among various microencapsulation methods, interfacial polymerization has been widely used to encapsulate pesticides because of its simple process, low preparation cost, and outstanding application properties . The shell material is one of the most important components because it is a crucial factor that influences the structure, permeability, controlled release, and thermal stability of the microcapsules. , A survey of the literature indicates that polyurea, polyurethane, and epoxy resin are usually selected as the microcapsule shell for interfacial polymerization. , Especially, polyurea is a unique polymer with physical properties and chemical stabilities.…”

Quasi‐continuous synthesis of iron single atom catalysts via a microcapsule pyrolysis strategy

“…Herein, inspired by our previous works on the controllable preparation of microcapsules [37][38][39] and on SACs, 20,40,41 we proposed a facile and efficient synthesis method by utilizing bulk emulsification and pendant drop technologies, to quasi-continuously synthesize S, N codoped carbon supported SACs (M/SNC, M=Fe, Ni, Co). This strategy includes three steps, (a) the continuous synthesis of metal precursor microcapsules encapsulated by chitosan (CS)/sodium dodecyl sulfate (SDS) hydrogel, and then followed by (b) pyrolysis and (c) acid washing.…”