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표면개질 된 폴리테트라플르오르에틸렌 필름표면의 세포부착에 관한 연구
노인섭 서울産業大學校 2000 논문집 Vol.51 No.2
Biological interactions were measured on variously treated PTFE films by seeding and culture of human foreskin fibroblasts. Both cell adhesion and spreading were measured by counting the cell numbers and measuring the cell coverage area. The unmodified substrates supported very small amounts of cell adhesion and spreading but the thermo-chemically reduced substrates supported extensive cell adhesion and spreading, presumably via protein adsorption. While the protein adsorption on the unmodified ones were assumed to be hydrophobic interaction, that on the modified ones ionic interaction. While the unmodified PTFE film has only nonionic fluorocarbons, thus inducing interactions of non-ionic portions of the proteins with the hydrophobic film surface, the modified film has various ionic charges, leading to ionic interactions of the ionic portions of the proteins with the hydrophilic surfaces. Surface chemical compositions of both the modified and unmodified PTFE films were verified by electron spectroscopy for chemical analysis. The unique chemical peaks of PTFE films were 292.5eV and the surface modification generated new peaks located around approximately 284.5eV. The new peaks contained unsaturations and other oxygen-containing broad peaks. Dynamic contact angle measurement and low voltage scanning electron microscopy pictures supported the surface modification with its surface tension energy increase showing ionic charges and morphological changes, respectively. These cellular adhesion results may lead to better designs of expanded poly(tetrafluoroethylene) vascular grafts and improve their long-term graft patency.