Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 9, Issue 4, Pages 1814-1825Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c08009
Keywords
metal-organic framework; polydopamine; slow/controlled release; PLLA scaffold; laser sintering
Categories
Funding
- National Natural Science Foundation of China [51935014, 82072084, 81871498]
- JiangXi Provincial Natural Science Foundation of China [20192ACB20005, 2020ACB214004]
- Provincial Key R&D Projects of Jiangxi [20201BBE51012]
- Guangdong Province Higher Vocational Colleges & Schools Pearl River Scholar Funded Scheme (2018)
- Project of Hunan Provincial Science and Technology Plan [2017RS3008]
- Shenzhen Science and Technology Plan Project [JCYJ20170817112445033]
- Innovation Team Project on University of Guangdong Province [2018GKCXTD001]
- Technology Innovation Platform Project of Shenzhen Institute of Information Technology 2020 [PT2020E002]
- China Postdoctoral Science Foundation [2020M682114]
- Open Research Fund of Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology
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By constructing ZIF-8@PDA-HA core-shell-structured nanoparticles, the release of zinc ions in the PLLA scaffold was effectively reduced, while the bioactivity and capabilities of cell adhesion, proliferation, and differentiation were enhanced.
Zeolitic imidazolate framework-8 (ZIF-8) nano-particles are able to act as effective reinforcements to enhance the overall performance of a poly-L-lactic acid (PLLA) scaffold due to its interface compatibility and natural degradability. Nevertheless, the fast degradation of ZIF-8 would release excessive zinc ions, which produces adverse effects on natural cell growth. In this study, a core-shell-structured nanoparticle, in which ZIF served as a core and hydroxyapatite (HA) served as a shell, was constructed by polydopamine (PDA)-induced in situ growth of HA on ZIF-8 nanoparticles, aiming to control the zinc ion release. Then, the core-shell-structured nanoparticle (ZIF-8@PDA-HA) was introduced into the PLLA scaffold using selective laser sintering. Results showed that the zinc ion concentration for the PLLA/ZIF-8@ PDA-HA scaffold decreased by 65.3% after 28 days of immersion, as compared with the PLLA/ZIF-8 scaffold. Moreover, the in situ synthesized HA possessed superior bioactivity, which effectively enhanced the mineralization ability of scaffolds and promoted cell adhesion, proliferation, and differentiation.
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