Bright and stable Cy3-encapsulated fluorescent silica nanoparticles with a large Stokes shift

Traditional organic fluorophores, like cyanine dyes, suffer from their poor stability and weak brightness of individual molecule. In this work, a novel cyanine dye with a large Stokes shift (∼75 nm) was encapsulated inside silica nanoparticles. The obtained small fluorescent silica nanoparticle (FSN...

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Veröffentlicht in:Dyes and pigments 2012-04, Vol.93 (1), p.1532-1537
Hauptverfasser: Chen, Gengwen, Song, Fengling, Wang, Xu, Sun, Shiguo, Fan, Jiangli, Peng, Xiaojun
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container_end_page 1537
container_issue 1
container_start_page 1532
container_title Dyes and pigments
container_volume 93
creator Chen, Gengwen
Song, Fengling
Wang, Xu
Sun, Shiguo
Fan, Jiangli
Peng, Xiaojun
description Traditional organic fluorophores, like cyanine dyes, suffer from their poor stability and weak brightness of individual molecule. In this work, a novel cyanine dye with a large Stokes shift (∼75 nm) was encapsulated inside silica nanoparticles. The obtained small fluorescent silica nanoparticle (FSNP) exhibits more than ten times brightness than the free dye. The enhanced fluorescence brightness was assigned to the less homo Förster resonance energy transfer (HFRET) between multiple fluorophores, which was confirmed by the longer fluorescence lifetime of FSNP with a large Stokes shift than that with a normal Stokes shift. The FSNP’s photostability is much better than organic fluorophores and comparable with that of Quantum Dots. When used in bioimaging, the FSNP remained a stable fluorescence signal, while the control free dye faded within 12 h. [Display omitted] ► A new cyanine dye with a large Stokes shift (74 nm) was synthesized. ► The dye was encapsulated inside a silica nanoparticle in a core-shell format. ► The obtained nanoparticle exhibits brighter fluorescence than the free dye. ► The enhanced fluorescence brightness was assigned to the less homo-FRET. ► Better photostability and biostability are achieved.
doi_str_mv 10.1016/j.dyepig.2011.09.002
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source ScienceDirect Freedom Collection (Elsevier)
subjects Brightness
Cyanine dyes
Dyes
Encapsulation
Fluid flow
Fluorescence
HFRET
Nanoparticles
Photostability
Silica nanoparticles
Silicon dioxide
Stokes shift
title Bright and stable Cy3-encapsulated fluorescent silica nanoparticles with a large Stokes shift
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