title: Hemocompatibility of poly(vinylidene fluoride) membrane grafted with network-like and brush-like antifouling layer controlled via plasma-induced surface PEGylation.
abstract: In this work, the hemocompatibility of PEGylated poly(vinylidene fluoride) (PVDF) microporous membranes with varying grafting coverage and structures via plasma-induced surface PEGylation was studied. Network-like and brush-like PEGylated layers on PVDF membrane surfaces were achieved by low-pressure and atmospheric plasma treatment. The chemical composition, physical morphology, grafting structure, surface hydrophilicity, and hydration capability of prepared membranes were determined to illustrate the correlations between grafting qualities and hemocompatibility of PEGylated PVDF membranes in contact with human blood. Plasma protein adsorption onto different PEGylated PVDF membranes from single-protein solutions and the complex medium of 100% human plasma were measured by enzyme-linked immunosorbent assay (ELISA) with monoclonal antibodies. Hemocompatibility of the PEGylated membranes was evaluated by the antifouling property of platelet adhesion observed by scanning electron microscopy (SEM) and the anticoagulant activity of the blood coagulant determined by testing plasma-clotting time. The control of grafting structures of PEGylated layers highly regulates the PVDF membrane to resist the adsorption of plasma proteins, the adhesion of platelets, and the coagulation of human plasma. It was found that PVDF membranes grafted with brush-like PEGylated layers presented higher hydration capability with binding water molecules than with network-like PEGylated layers to improve the hemocompatible character of plasma protein and blood platelet resistance in human blood. This work suggests that the hemocompatible nature of grafted PEGylated polymers by controlling grafting structures gives them great potential in the molecular design of antithrombogenic membranes for use in human blood.
authors: R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan Christian University, Chung-Li, Taoyuan 320, Taiwan. ychang@cycu.edu.tw
authors: Yung
authors: Y
authors: Chang
authors: Yu-Ju
authors: YJ
authors: Shih
authors: Chao-Yin
authors: CY
authors: Ko
authors: Jheng-Fong
authors: JF
authors: Jhong
authors: Ying-Ling
authors: YL
authors: Liu
authors: Ta-Chin
authors: TC
authors: Wei
mesh_terms: D001272:Atmosphere; D001672:Biocompatible Materials / Q000737:chemistry*; D057219:Biofouling / Q000517:prevention & control*; D006801:Humans; D008567:Membranes, Artificial; D010949:Plasma / Q000378:metabolism*; D011145:Polyvinyls / Q000737:chemistry*; D013499:Surface Properties; D005465:Fluorocarbon Polymers
chemical_list: D001672:Biocompatible Materials; D008567:Membranes, Artificial; D011145:Polyvinyls; C024865:polyvinylidene fluoride; D005465:Fluorocarbon Polymers