Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7233561 | Biosensors and Bioelectronics | 2014 | 4 Pages |
Abstract
We have developed a new dual-color fluorescent biosensor for protein detection based on terminal protection of small-molecule-linked DNA and the enzymolysis of exonuclease III (Exo III). The determination of streptavidin (SA) was realized via fluorescence signals of the green color from quantum dots (QDs) and the red from [Ru(phen)2(dppx)]2+. In the absence of SA, biotin-DNA was degradated by the Exo III, thus making the [Ru(phen)2(dppx)]2+ employed as a fluorescence quencher to the QDs. With the addition of SA, dual-color response appeared because of the specific binding between SA and biotin so that the biotin-dsDNA was protected and combined with [Ru(phen)2(dppx)]2+, leading to the QDs recovery and the generating of [Ru(phen)2(dppx)]2+ fluorescence. This sensor exhibited high sensitivity with a low detection limit (2.11Â ng/mL) and firstly introduced dual-color QDs-ruthenium complex dyads to protein assay.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Chaohui Chen, Xia Xiang, Yufei Liu, Guohua Zhou, Xinghu Ji, Zhike He,