| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 601039 | Colloids and Surfaces B: Biointerfaces | 2011 | 6 Pages |
Microcapsules were prepared by microsieve membrane cross flow emulsification of Eudragit FS 30D/dichloromethane/edible oil mixtures in water, and subsequent phase separation induced by extraction of the dichloromethane through an aqueous phase. For long-chain triglycerides and jojoba oil, core–shell particles were obtained with the oil as core, surrounded by a shell of Eudragit. Medium chain triglyceride (MCT oil) was encapsulated as relatively small droplets in the Eudragit matrix. The morphology of the formed capsules was investigated with optical and SEM microscopy. Extraction of the oil from the core–shell capsules with hexane resulted in hollow Eudragit capsules with porous shells. It was shown that the differences are related to the compatibility of the oils with the shell-forming Eudragit. An oil with poor compatibility yields microcapsules with a dense Eudragit shell on a single oil droplet as the core; oils having better compatibility yield porous Eudragit spheres with several oil droplets trapped inside.
Graphical abstractExamples of internally structured capsules.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights• Differently structured hollow microcapsules are prepared. • Edible oils were encapsulated in a pH-responsive polymer • The internal structure of the microcapsules is determined by the type of oil.
