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Poly(l-lactic acid)/vaterite composite coatings on metallic magnesium

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Abstract

Poly(l-lactic acid)/vaterite composite materials were coated onto metallic magnesium substrates to control rapid degradation and to improve biocompatibility. Two types of composites were prepared by adding 30 and 60 wt% of vaterite to poly(l-lactic acid) (PLLA). The composite coating layer that contained 30 wt% vaterite in the PLLA matrix had almost no pores on the surface and suppressed the initial rapid degradation of the Mg substrate. After immersion in a culture medium for 7 days, pores of 0.5–1.0 μm in diameter formed on the surface. The composite coating layer that contained 60 wt% vaterite with pores of 1.0–2.0 μm in diameter on the surface did not suppress the degradation of the Mg substrate. During immersion, the pH of the media near the composite coating surfaces was maintained at 7.4–7.5 because of the degradation of PLLA and because the vaterite particles dissolved in the solution. Proliferation of murine osteoblast-like cells (MC3T3-E1) on the substrates was improved using composite coatings. Cells on the coating that contained 60 wt% vaterite had significantly higher proliferation than those on a bare Mg substrate. Our coating provides the optimum combination to suppress the initial Mg degradation and to promote cell growth on the coating surface by adjusting the vaterite content in the composite.

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Acknowledgments

The authors thank Dr. Hirotaka Maeda for helpful discussions. This work was supported in part by the Institute of Ceramics Research and Education (ICRE), Nagoya Institute of Technology.

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Authors and Affiliations

  1. Department of Frontier Materials, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi, 466-8555, Japan

    Shinya Yamada & Toshihiro Kasuga

  2. Biometals Group, Biomaterials Unit, Nano-Life Field, International Center for Materials Nanoarchitechtonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan

    Akiko Yamamoto

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  1. Shinya Yamada
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Correspondence to Toshihiro Kasuga.

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Yamada, S., Yamamoto, A. & Kasuga, T. Poly(l-lactic acid)/vaterite composite coatings on metallic magnesium. J Mater Sci: Mater Med 25, 2639–2647 (2014). https://doi.org/10.1007/s10856-014-5302-5

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  • DOI: https://doi.org/10.1007/s10856-014-5302-5

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