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Para-amino benzoic acid doped micro-grooved carbon fibers to improve strength and biocompatibility of PLA-PEG

对氨基苯甲酸掺杂的微槽结构碳纤维用于改善PLA-PEG的强度及生物相容性

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Abstract

Para-amino benzoic acid (PABA), a folic acid related metabolite, was first introduced to fabricate micro-grooves and improve hydrophilicity over surfaces of carbon fibers (CFs). Then, engineered CFs/poly(lactic acid)-poly(ethylene glycol) (PLA-PEG) biocomposites were fabricated by a solvent casting/particulate leaching method. We found that introducing small hydrophobic PABA molecules and fabricating patterned structures would lead to benign integrated interfaces between CFs and the PLA-PEG matrix. Specifically, the compressive strength of CFs/PLA-PEG was improved from 3.98 to 5.48 MPa. In addition, the CFs/PLA-PEG biocomposites significantly accelerated the adhesion and proliferation of pre-osteoblasts with minimized cytotoxicity. By comparing the cyto-compatibility of L929 and MC3T3 cells cultured on different modified PLA-PEG composites, it could be concluded that PABA-CFs not only overcame the limitation of poor strength of PLA-PEG, but also improved the cell growth. These results indicate that the PABA-CFs reinforced PLA-PEG biocomposites could be a potential alternative for tissue engineering scaffolds.

摘要

本文利用一种叶酸代谢产物, 对氨基苯甲酸(PABA), 来改性碳纤维(CFs), 通过在其表面形成微槽结构以达到改善其亲水性的目的. 采用溶液浇注/粒子沥滤法制备了CFs/PLA-PEG复合生物支架. 研究发现, 引入小的PABA疏水分子可以在CFs和聚乳酸-聚乙二醇(PLA-PEG)基 体之间形成良性结合界面. CFs/PLA-PEG生物支架的抗压强度从3.98 MPa提高到5.48 MPa. 由于PABA的改性, 低毒性的CFs/PLA-PEG复合材 料显著加速了预成骨细胞的粘附, 对细胞增殖没有明显影响. 通过比较支架上的L929细胞和MC3T3细胞的生物相容性, 可以认为PABA-CFs 不仅克服了PLA-PEG强度差的缺陷, 而且可以促进细胞的生长, 证明了PABA-CFs增强PLA-PEG生物复合材料可作为一种潜在的组织工程 支架材料.

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Acknowledgments

This work was supported by the National Key Research and Development Project (2016YFB0303201), the Research and Innovation Project of Shanghai Municipal Education Commission (14zz069), and Donghua University Graduates’ Innovation Funding Projects (EG2015006).

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Authors and Affiliations

  1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Shanghai, 201620, China

    Yanni Shi  (史燕妮) & Qilin Wu  (吴琪琳)

  2. College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China

    Yanni Shi  (史燕妮), Min Li  (李敏), Ning Wang  (王宁) & Qilin Wu  (吴琪琳)

  3. Department of Mechanical Engineering, Faculty of Engineering and Department of Biochemistry & Genetics, Faculty of Medicine P.I. @ Manitoba Institute of Child Health, the University of Manitoba, Winnipeg, R3T 2N2, Canada

    Malcolm Xing

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  1. Yanni Shi  (史燕妮)
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  2. Min Li  (李敏)
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  5. Qilin Wu  (吴琪琳)
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Corresponding author

Correspondence to Qilin Wu  (吴琪琳).

Additional information

These authors contributed equally to this study.

Yanni Shi received her BSc and MSc degrees from Donghua University in 2013 and 2016, respectively. Her research interest mainly focuses on the modification and characterization of carbon-based materials and their applications in biological fields.

Min Li was born in 1992. She received her BSc degree in material science and engineering from Huaqiao University in 2014. She is currently a graduate student at Donghua University and her research interest focuses on the modification and characterization of carbon quantum dots and their applications in chemical sensors.

Qilin Wu received her PhD degree from Donghua University in 2002. As a visiting scholar, she worked at the University of California, Davis for one year from 2006 to 2007. Now she is a full professor of Donghua University. Her research focuses on carbon materials.

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Shi, Y., Li, M., Wang, N. et al. Para-amino benzoic acid doped micro-grooved carbon fibers to improve strength and biocompatibility of PLA-PEG. Sci. China Mater. 59, 911–920 (2016). https://doi.org/10.1007/s40843-016-5065-0

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  • DOI: https://doi.org/10.1007/s40843-016-5065-0

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