Abstract
The rapid and convenient method for identification of all kinds of G-quadruplex is highly desirable. In the present study, a novel colorimetric indicator for a vast variety of G-quadruplex was designed and synthesized on the basis of thiazole orange and isaindigotone skeleton. Its distinct color change enables label-free visual detection of G-quadruplexes, which is due to the disassembly of dye H-aggregates to monomers. This specific detection of G-quadruplex arises from its end-stacking interaction with G-quartet. On the basis of this universal indicator, a facile approach for large-scale identification of G-quadruplex was developed.
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