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Acta Biomater. 2017 Oct 1;61:169-179. doi: 10.1016/j.actbio.2017.08.007. Epub 2017 Aug 4.

Zwitterionic sulfobetaine polymer-immobilized surface by simple tyrosinase-mediated grafting for enhanced antifouling property.

Author information

1
Department of Molecular Science and Technology, Ajou University, Suwon 16499, South Korea.
2
Cellbiocontrol Laboratory, Department of Medical Engineering, Yonsei University College of Medicine, Seoul 03722, South Korea.
3
Department of Molecular Science and Technology, Ajou University, Suwon 16499, South Korea; Department of Applied Chemistry and Biological Engineering, Ajou University, Suwon 16499, South Korea.
4
Department of Molecular Science and Technology, Ajou University, Suwon 16499, South Korea; Department of Applied Chemistry and Biological Engineering, Ajou University, Suwon 16499, South Korea. Electronic address: kdp@ajou.ac.kr.

Abstract

Introducing antifouling property to biomaterial surfaces has been considered an effective method for preventing the failure of implanted devices. In order to achieve this, the immobilization of zwitterions on biomaterial surfaces has been proven to be an excellent way of improving anti-adhesive potency. In this study, poly(sulfobetaine-co-tyramine), a tyramine-conjugated sulfobetaine polymer, was synthesized and simply grafted onto the surface of polyurethane via a tyrosinase-mediated reaction. Surface characterization by water contact angle measurements, X-ray photoelectron spectroscopy and atomic force microscopy demonstrated that the zwitterionic polymer was successfully introduced onto the surface of polyurethane and remained stable for 7days. In vitro studies revealed that poly(sulfobetaine-co-tyramine)-coated surfaces dramatically reduced the adhesion of fibrinogen, platelets, fibroblasts, and S. aureus by over 90% in comparison with bare surfaces. These results proved that polyurethane surfaces grafted with poly(sulfobetaine-co-tyramine) via a tyrosinase-catalyzed reaction could be promising candidates for an implantable medical device with excellent bioinert abilities.

STATEMENT OF SIGNIFICANCE:

Antifouling surface modification is one of the key strategy to prevent the thrombus formation or infection which occurs on the surface of biomaterial after transplantation. Although there are many methods to modify the surface have been reported, necessity of simple modification technique still exists to apply for practical applications. The purpose of this study is to modify the biomaterial's surface by simply immobilizing antifouling zwitterion polymer via enzyme tyrosinase-mediated reaction which could modify versatile substrates in mild aqueous condition within fast time period. After modification, pSBTA grafted surface becomes resistant to various biological factors including proteins, cells, and bacterias. This approach appears to be a promising method to impart antifouling property on biomaterial surfaces.

KEYWORDS:

Antifouling; Sulfobetaine; Surface modification; Tyrosinase-mediated grafting; Zwitterion

PMID:
28782724
DOI:
10.1016/j.actbio.2017.08.007
[Indexed for MEDLINE]

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