Cyanines as New Fluorescent Probes for DNA Detection and Two-Photon Excited Bioimaging
作者:Xin Jiang Feng、Po Lam Wu、Frédéric Bolze、Heidi W. C. Leung、King Fai Li、Nai Ki Mak、Daniel W. J. Kwong、Jean-François Nicoud、Kok Wai Cheah、Man Shing Wong
DOI:10.1021/ol100474b
日期:2010.5.21
A series of cyanine fluorophores based on fused aromatics as an electron donor for DNA sensing and two-photon bioimaging were synthesized, among which the carbazole-based biscyanine exhibits high sensitivity and efficiency as a fluorescent light-up probe for dsDNA, which shows selective binding toward the AT-rich regions. The synergetic effect of the bischromophoric skeleton gives a several-fold enhancement in a two-photon absorption cross-section as well as a 25- to 100-fold enhancement in two-photon excited fluorescence upon dsDNA binding.