Study of DNA adsorption on polypyrrole: interest of dielectric monitoring
作者： Bachir Saoudi , Christelle Despas , Mohamed M. Chehimi , Noraldeen Jammul , Michel Delamar
DOI: 10.1016/S0925-4005(99)00356-1
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摘要: Abstract The interest of high frequency impedance measurements performed on decanted solids was demonstrated for the in situ investigation DNA adsorption onto polypyrrole (PPy). dielectric method first applied to distinguish between polymers containing different dopant and monitor their ion-exchange occurring when PPy contacting a phosphate buffer solution. Results were compared those obtained by X-ray photoelectron spectroscopy (XPS) chromatography. Afterwards, effects investigated 0.01 M at pH 7. A significant decrease parameters observed upon adsorption, as result coverage conductive an insulating layer DNA, while maintaining, however, mobility doping anions bulk polymer. Irreversibility process assessed. Some conformational changes adsorbed have been suspected occur during deposition increasing amounts DNA.
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