Journal
JOURNAL OF MICROENCAPSULATION
Volume 34, Issue 1, Pages 82-90Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02652048.2017.1284278
Keywords
Alginate; inverse gelation; encapsulation; oil; surfactants
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The production of capsules by inverse gelation consists of adding dropwise oil containing calcium dispersion into an alginate bath. A dripping technique to produce capsules from oil-in-water (O/W) emulsions was proposed by Abang. However, little is known about the oil encapsulation using water-in-oil (W/O) emulsions. This work aims to develop a new method of W/O emulsions encapsulation by inverse gelation. The success of the W/O emulsion encapsulation is due to three factors: 1) use of an emulsion with moderate stability (50min); 2) production of an emulsion with at least 90g/L of CaCl2 and 3) addition of ethanol (20% v/v) into the alginate bath. Both wet and dry capsules were obtained with a spherical shape with diameters of 7 and 3.6mm, respectively. All volume of oil was encapsulated and the oil loading in the wet and dry capsules was of 23 and 68% v/v, respectively.
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