Journal
RSC ADVANCES
Volume 4, Issue 29, Pages 14833-14839Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra46457a
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Funding
- Alexander von Humboldt Foundation, Bonn, Germany
- Fundamental Research Funds for the Central Universities [ZZ1307]
- Beijing New-Star Program of Science and Technology [2009B10]
- Deutsche Forschungsgemeinschaft (DFG) [INST 275/241-1 FUGG]
- Thuringer Ministerium fur Bildung, Wissenschaft und Kultur (TMBWK) [62-4264 925/1/10/1/01]
- China Scholarship Council (CSC)
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We report here a facile strategy to fabricate three-dimensional (3D) hydroxyapatite (HA) architectures with well-defined long continuous interconnected pores by using electrospinning and biomimetic mineralization. To this end, a polymeric nanofiber (NF) scaffold with well-defined architecture was fabricated by electrospinning, and bone morphogenetic protein 2 (BMP2) was then adsorbed onto the chemically modified NFs through bio-conjugation. The 3D nanoporous HA architecture was finally fabricated by biomimetic mineralization of the NF-BMP2 hybrid in simulated body fluids and subsequent dissolution of NFs in hexafluoroisopropanol. The formation of NF-BMP2 hybrid was identified by confocal laser scanning microscopy analysis. The crystal structure of HA crystals formed on NFs was examined by X-ray diffraction. The chemical composition and interconnected porous structure of the created 3D HA architectures were measured by X-ray photoelectron spectroscopy, focused ion beam scanning electron microscopy, and transmission electron microscopy, respectively. This bottom-up strategy based on electrospinning and biomimetic mineralization opens up a new way to prepare diverse porous HA-based hybrid materials and shows great potential in drug delivery, gene transfer and tissue engineering.
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