Abstract
In this study, the fluorescence of Hoechst dyes is significantly lit up by addition of our designed MB probe, forming a complex of "molecular beacon"-hosted Hoechst dyes (HMB). Combined with this property, a novel graphene oxide (GO)-based fluorescent "on/off" switch was developed to visually follow bioassay utilizing HMB as signal indicators and GO as an excellent energy acceptor to efficiently quench the fluorescence of HMB in a label-easy format. We have demonstrated its application for label-easy fluorescence "turn on" detection of sequence-specific DNA and "turn off" detection of exonuclease with sensitivity and selectivity in a single step in homogeneous solution. Compared to traditional molecular beacons, the proposed design is cost-effective and simple to prepare without fluorescence labeling or chemical modification.
| Original language | English |
|---|---|
| Pages (from-to) | 8278-8282 |
| Number of pages | 5 |
| Journal | ACS Applied Materials and Interfaces |
| Volume | 5 |
| Issue number | 17 |
| DOIs | |
| State | Published - 11 Sep 2013 |
| Externally published | Yes |
Keywords
- Hoechst
- biosensing
- exonuclease
- graphene
- molecular beacon