Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 89, Issue -, Pages 61-66Publisher
ELSEVIER
DOI: 10.1016/j.colsurfb.2011.08.023
Keywords
Microcapsule; Coacervation; Cross-linking; Release; Kinetics
Funding
- National Natural Science Foundation of China [20936002, 20876078]
- National Key Technology Support Program of China [2011BAD23B03]
- National Basic Research Program of China [2007CB707805, 2009CB724700]
- Ministry of Education of China [NCET-09-0442]
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Microalgal oil was encapsulated in gelatin-gum Arabic complex coacervated matrices using transglutaminase (TG) as cross-linking agent. The effects of various cross-linking parameters including hardening time, temperature, pH and TG concentration on the oil release rate of the complex coacervation microcapsules (CCMs) were investigated, with sodium dodecyl sulfate (SDS) as release medium. The optimum parameters were as follows: hardening for Oh at 15 degrees C and pH 6.0 with TG concentration of 15 U/g gelatin. The microcapsules obtained under optimum conditions had the lowest oil release rate. By analyzing the oil release curves, it was found that the oil release rate did not exactly fit the modified first-order kinetic model but exhibited early time and late time approximations for unsteady state diffusion. A greater initial release of oil was clearly observed whatever cross-linking parameters were, while the release profile became constant indicating some sustained release after the first hour. (C) 2011 Elsevier B.V. All rights reserved.
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