Enhancing biocompatibility and corrosion resistance of biodegradable Mg-Zn-Y-Nd alloy by preparing PDA/HA coating for potential application of cardiovascular biomaterials

https://doi.org/10.1016/j.msec.2019.110607Get rights and content

Highlights

  • The PDA/HA coating is successfully prepared onto biodegradable magnesium alloy surface.

  • The corrosion resistance of the Mg-Zn-Y-Nd alloy has been greatly improved after coated with PDA/HA.

  • Covered with PDA/HA coating also improves the blood compatibility of the Mg-Zn-Y-Nd substrate.

  • The PDA/HA coating significantly improve surface endothelialization of the Mg-Zn-Y-Nd alloy.

Abstract

In this paper the poly-dopamine (PDA)/hyaluronic acid (HA) coatings with different HA molecular weight (MW, 4 × 103, 1 × 105, 5 × 105 and 1 × 106 Da) were prepared onto the NaOH passivated Mg-Zn-Y-Nd alloy aiming at potential application of cardiovascular implants. The characterization of weight loss, polarization curves and surface morphology indicated that the coatings with HA MW of 1 × 105 (PDA/HA-2) and 1 × 106 Da (PDA/HA-4) significantly enhanced the corrosion resistance of Mg-Zn-Y-Nd. In vitro biological test also suggested better hemocompatibility, pro-endothelialization, anti-hyperplasia and anti-inflammation functions of the PDA/HA-2- and PDA/HA-4-coated Mg-Zn-Y-Nd alloy. Nevertheless, the in vivo implantation of SD rats' celiac artery demonstrated that the PDA/HA-2 had preferable corrosion resistance and biocompatibility.

Keywords

Cardiovascular biomaterial
Mg-Zn-Y-Nd alloy
Multi-functions
Surface modification
Hyaluronic acid
Poly-dopamine

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