A novel method of oil encapsulation in core-shell alginate microcapsules by dispersion-inverse gelation technique

Oil-core microcapsules may be produced by dispersing a calcium solution-oil emulsion into an alginate solution. The release of calcium from the emulsion leads to the gelation of alginate around the oil droplet and therefore to the formation of microcapsules. This work aims to propose a new method of...

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Bibliographic Details
Published in:Reactive & functional polymers 2017-05, Vol.114, p.49-57
Main Authors: Martins, Evandro, Poncelet, Denis, Renard, Denis
Format: Article
Language:English
Subjects:
Alginate
Calcium
Destabilization
Dispersion
Dyes
Emulsions
Encapsulation
Gelation
Inverse gelation
Life Sciences
Light emitting diodes
Microencapsulation
Oil
Oils & fats
Volatile compounds
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Summary:Oil-core microcapsules may be produced by dispersing a calcium solution-oil emulsion into an alginate solution. The release of calcium from the emulsion leads to the gelation of alginate around the oil droplet and therefore to the formation of microcapsules. This work aims to propose a new method of microcapsule production by dispersion-inverse gelation technique. Therefore, W/O emulsions were dispersed in alginate solution and led to the formation of capsules with varying diameters depending on the stirring rate of the alginate bath. The membrane thickness varied between 35 and 200μm depending on the type of emulsion destabilization treatment used. Oil was encapsulated at a yield of 100% allowing the extrapolation of this method at pilot scale. In addition, microcapsules released hydrophilic dye in few hours while hydrophobic dye was retained in the core due to interaction with the oil phase. Core-shell alginate microcapsules produced by dispersion-inverse gelation technique displayed interesting property suitable for applications where actives need to be retained during long times or for volatile compounds.
ISSN:1381-5148
1873-166X
DOI:10.1016/j.reactfunctpolym.2017.03.006