Journal
ANALYTICAL CHEMISTRY
Volume 84, Issue 4, Pages 1956-1962Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac202993p
Keywords
-
Categories
Funding
- National Natural Science Foundation of China [20975034]
- National Key Scientific Program of China [2011CB911001, 2011CB911003]
- National Institutes of Health [GM066137, GM079359, CA133086]
Ask authors/readers for more resources
We have developed DNA-functionalized silica nanoparticles for the rapid, sensitive, and selective detection of mercuric ion (Hg2+) in aqueous solution. Two DNA strands were designed to cap the pore of dye-trapped silica nanoparticles. In the presence of ppb level Hg2+, the two DNA strands are dehybridized to uncap the pore, releasing the dye cargo with detectable enhancements of fluorescence signal. This method enables rapid (less than 20 min) and sensitive (limit of detection, LOD, 4 ppb) detection, and it was also able to discriminate Hg2+ from twelve other environmentally relevant metal ions. The superior properties of the as-designed DNA-functionalized silica nanoparticles can be attributed to the large loading capacity and highly ordered pore structure of mesoporous silica nanoparticles, as well as the selective binding of thymine-rich DNA with Hg2+. Our design serves as a new prototype for metal-ion sensing systems, and it also has promising potential for detection of various targets in stimulus-release systems.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available