期刊
COLLOIDS AND SURFACES B-BIOINTERFACES
卷 81, 期 1, 页码 206-211出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfb.2010.07.008
关键词
Alginate; Chitosan; Insulin; Controlled release; Magnetic nanoparticles
资金
- CAPES
The challenge of this work was to investigate the potential of alginate/chitosan beads containing magnetite nanoparticles as a drug delivery system. The insulin beads were prepared by dripping a solution of sodium alginate containing insulin into a CaCl(2) solution. Magnetite nanoparticles of 5 nm mean size were synthesized inside the alginate egg-box structure by co-precipitation of Fe(III) and Fe(II) in the presence of NH(4)OH. Quantitative analysis revealed that insulin encapsulation depends on the initial protein content and 35% of insulin was entrapped by alginate beads for a protein concentration of 10 wt%. It was verified that approximately 50% of the insulin was released to Milli-Q water in 800 h release experiments. The application of oscillating magnetic field increased three fold the insulin release. The results suggest that the alginate/chitosan system containing magnetite nanoparticles is a promising system for clinical applications of controlled release of insulin in the presence of an oscillating magnetic field in a subcutaneous implant approach. (C) 2010 Elsevier B.V. All rights reserved.
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