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由于静电纺丝导致的 PVDF 纤维的结构变化及其对生物功能的影响。

Structural changes in PVDF fibers due to electrospinning and its effect on biological function.

机构信息

Department of Biomedical Engineering, New Jersey Institute of Technology, Newark, NJ 07102-1982, USA.

出版信息

Biomed Mater. 2013 Aug;8(4):045007. doi: 10.1088/1748-6041/8/4/045007. Epub 2013 Jun 17.

Abstract

Polyvinylidine fluoride (PVDF) is being investigated as a potential scaffold for bone tissue engineering because of its proven biocompatibility and piezoelectric property, wherein it can generate electrical activity when mechanically deformed. In this study, PVDF scaffolds were prepared by electrospinning using different voltages (12-30 kV), evaluated for the presence of the piezoelectric β-crystal phase and its effect on biological function. Electrospun PVDF was compared with unprocessed/raw PVDF, films and melt-spun fibers for the presence of the piezoelectric β-phase using differential scanning calorimetry, Fourier transform infrared spectroscopy and x-ray diffraction. The osteogenic differentiation of human mesenchymal stem cells (MSCs) was evaluated on scaffolds electrospun at 12 and 25 kV (PVDF-12 kV and PVDF-25 kV, respectively) and compared to tissue culture polystyrene (TCP). Electrospinning PVDF resulted in the formation of the piezoelectric β-phase with the highest β-phase fraction of 72% for electrospun PVDF at 25 kV. MSCs cultured on both the scaffolds were well attached as indicated by a spread morphology. Cells on PVDF-25 kV scaffolds had the greatest alkaline phosphatase activity and early mineralization by day 10 as compared to TCP and PVDF-12 kV. The results demonstrate the potential for the use of PVDF scaffolds for bone tissue engineering applications.

摘要

聚偏二氟乙烯(PVDF)因其良好的生物相容性和压电特性而被研究作为骨组织工程的潜在支架,其中它在机械变形时可以产生电活性。在这项研究中,使用不同的电压(12-30 kV)通过静电纺丝制备了 PVDF 支架,评估了存在压电β-晶相及其对生物功能的影响。使用差示扫描量热法、傅里叶变换红外光谱和 X 射线衍射法比较了静电纺丝的 PVDF 与未经处理/原始的 PVDF、薄膜和熔融纺丝纤维之间存在的压电β-相。通过碱性磷酸酶活性和早期矿化来评估人骨髓间充质干细胞(MSCs)在 12 和 25 kV 下静电纺丝的支架(分别为 PVDF-12 kV 和 PVDF-25 kV)上的成骨分化,并与组织培养聚苯乙烯(TCP)进行比较。静电纺丝的 PVDF 形成了压电β-相,其中 25 kV 下静电纺丝的β-相分数最高为 72%。细胞在支架上的附着情况良好,形态伸展,表明细胞在支架上很好地附着。与 TCP 和 PVDF-12 kV 相比,细胞在 PVDF-25 kV 支架上的碱性磷酸酶活性和早期矿化在第 10 天达到最大值。结果表明,PVDF 支架在骨组织工程应用中具有潜在的应用价值。

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