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BIOFUNCTIONALIZATION OF PET/SiO_2 SURFACES FOR SINGLE MOLECULE EXPERIMENTS AND MEDICAL APPLICATIONS
ALEXANDROS KATRANIDIS,ALEXANDROS MELACHROINOS,PANAGIOTIS G. KARAGIANNIDIS,SYLVIE LOUSINIAN,GEORGIOS PAPADOPOULOS,STERGIOS LOGOTHETIDIS,THEODORA CHOLI-PAPADOPOULOU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2011 NANO Vol.6 No.3
PET/SiO2 layers were chemically modified to maintain immobilization of functional single molecules. GFP molecules provide an ideal system due to their stability and intrinsic fluorescence. GFP in vivo biotinylated within its NH2-terminal region and attached on the substrate via the biotin–streptavidin bond was further investigated with confocal microscopy, atomic force microscopy (AFM) and spectroscopic ellipsometry (SE). AFM revealed monolayered donut-like structures representing assemblies of biotin–streptavidin–biotin–GFP immobilized onto PET/SiO_2 surfaces via mPEG. In particular, regions with an approximate height of 12 nm, which approaches the molecular dimensions of the above complex given by molecular modeling, could be detected. The dimensions of the donut-like structures suggest a close-to-each-other positioning of the GFP molecules — which, however, retain their functionality, as evidenced by confocal microscopy.