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17 May 2010 Optimisation of fluorescent DNA labels for two-photon microscopy
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We have investigated a series of mono-, bis- and trisvinyl-pyridinium TP derivatives (TP-Py) which exhibit interesting properties : good water solubility, reduced size, high photostability, large two-photon absorption cross-sections (δ up to 700 GM), red emission (λem=660-680nm). Most importantly, TP-Py happen to be poorly fluorescent in water whereas their fluorescence is strongly enhanced when binding to various forms of DNA. We showed that this property originates in the spontaneous immobilisation of the dye inside the double-stranded DNA helix. Due to moderate fluorescence quantum yield efficiencies (η), the brightness of TP-Py appears however to be improvable (ηδ=19). For this purpose, a new generation of specifically engineered TP derivatives have been designed and extensively characterized. We showed that switching from a classical TP core to a more electron-rich trinaphtyl (TN) core enables to increase the molecular brightness although reducing drastically the dye-DNA specific interactions.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
G. Metgé, C. Fiorini-Debuisschert, F. Charra, G. Bordeau, E. Faurel, and M. P. Teulade-Fichou "Optimisation of fluorescent DNA labels for two-photon microscopy", Proc. SPIE 7715, Biophotonics: Photonic Solutions for Better Health Care II, 77150Q (17 May 2010);

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