Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 33, Issue 4, Pages 326-331Publisher
WILEY-BLACKWELL
DOI: 10.1002/marc.201100685
Keywords
microcapsules; chitosan; desolvation; CaCO3 particles
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Funding
- Natural Science Foundation of China [50903069, 20804036, 51120135001]
- Zhejiang Provincial Natural Science Foundation of China [Z4090177, Y4110064]
- Ministry of Science and Technology of China for the Indo-China Cooperation [2010DFA51510]
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Incubation of CaCO3 microparticles in chitosan (CS) solution at pH 5.2 and following with ethylenediaminetetraacetic acid disodium salt (EDTA) treatment resulted in CS single-component microcapsules with an ultra-thick wall structure. Repeating the incubation caused stepwise increase of wall thickness and finally resulted in CS microcapsules with a layered structure. This unique method is mediated by precipitation of CS on the CaCO3 particles as a result of pH increase caused by the partial dissolution of CaCO3. The obtained CS capsules are stable at neutral pH.
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