کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1427315 | 986858 | 2006 | 5 صفحه PDF | دانلود رایگان |
The multiple biologically active trace element delivery remains a problem in regeneration medicine and tissue engineering. A novel approach to fabricate the biologically active trace elements assembly in a core–shell system for cooperative controlled-release has been proposed. Firstly, using a pH-dependent electrostatic interaction, zinc and strontium ions were incorporated into the silica gel nanospheres. Subsequently a porous octacalcium phosphate (OCP) shell was coated on the nanospheres tailored by poly(acrylate sodium) molecules. In vitro test shows that this hierarchical multilayered nanostructure can achieve a shell-/pH-dependent controlled-release of silicon, strontium and zinc ions. The wet-chemical route to selective synthesis of the core–shell Silica@OCP system may provide a general model to develop cooperative encapsulation of biologically active ions in a silica-based system by using layer-by-layer assembly technique for controlled-release in biomedical areas.
Journal: Journal of Controlled Release - Volume 116, Issue 3, 1 December 2006, Pages 360–364