Albumin and fibrinogen adsorption on PU-PHEMA surfaces

• Type: Article in International Scientific Journal
• Date: 2003

Authors

M. C. L. Martins (Author) Other; D. Wang (Author) Other; J. Ji (Author) Other; L. Feng (Author) Other; Mário Adolfo Barbosa (Author) FEUP

Journal

Title: Biomaterials

Vol. 24 No. 12

Pages: 2067-2076

ISSN: 0142-9612

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 65 Citations

Scopus - 62 Citations

Other information

Authenticus ID: P-000-GRG

DOI: 10.1016/s0142-9612(03)00002-4

Abstract (EN): Materials that adsorb specific proteins may find a variety of applications in the biomedical field. The aim of this study was the preparation of a hydrophilic surface, with low protein adsorption, to be used in tile future as a support for the immobilisation of several species, e.g. Cibacron Blue F3G-A, which has been described to induce specific albumin adsorption. Poly(hydroxyethylmethacrylate) (PHEMA) and poly(hydroxyethylacrylate) (PHEA) were chosen as tile hydrophilic surface because they can be easily polymerised and possess hydroxyl groups that can be used for the immobilisation of different compounds. Thin films of PHEMA and PHEA were successfully graft polymerised onto the surface of a commercial poly(etherurethane) (PU) using ceric ion as initiator. Grafting polymerisations were followed by mass gain and attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). Since stability tests demonstrated that only PU-PHEMA was stable in alkaline solutions, a necessary condition to future immobilisations, the investigation was focused on the coating of PU with PHEMA. PU-PHEMA films were characterised in detail using several techniques as mass gain, ATR-FTIR, contact angle measurements, X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). Protein adsorption was evaluated using radiolabelled albumin and fibrinogen from pure solutions and from mixtures of both proteins. PU Surfaces modified with PHEMA have demonstrated low protein adsorption, showing their potential use as substrates. This opens the possibly of exploring the advantages of selective adsorption by appropriate immobilisation of specific molecules.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10