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Metal ion-mediated assembly of DNA nanostructures for cascade fluorescence resonance energy transfer-based fingerprint analysis.
- Source :
-
Analytical chemistry [Anal Chem] 2014 Jul 15; Vol. 86 (14), pp. 7084-7. Date of Electronic Publication: 2014 Jun 25. - Publication Year :
- 2014
-
Abstract
- Contamination of heavy metal ions in an aquatic environment poses a serious threat to human health. More seriously, heavy metal ions are usually present in the environment in a mixture, and the synergetic toxicity of multiple heavy metal ions is revealed (Aragay et al. Chem. Rev. 2011, 111, 3433; Chu et al. Aquat. Toxicol. 2002, 61, 53). Unfortunately, most of the existing methods based on DNA sequences are focusing on the detection of one type of metal ions. Simple and multiplexed detection of multiple metal ions has been poorly investigated and remains challenging. Here, we re-engineered the DNA sequences for Pb(2+), Hg(2+), and Ag(+), through which the binding of multiple metal ions initiated the self-assembly of these DNA sequences. On the basis of our rationally designed multicolor fluorescent labeling of the DNA sequences, cascade fluorescence resonance energy transfer (FRET) occurred. As a result, a fingerprint fluorescent spectrum was produced to indicate the presence of a single type of metal ions or multiple metal ions. The major advantages of our cascade FRET fingerprint technology include the following: (1) the "mix and read" detection mode in homogeneous solution is simple without the need of complicated instruments; (2) only single excitation is required to provide the cascade FRET fingerprint spectrum; (3) multiplexed detection capability can be realized intuitively and sensitively.
- Subjects :
- Carbocyanines chemistry
DNA metabolism
Fluorescence Resonance Energy Transfer instrumentation
Fluorescent Dyes chemistry
Lead analysis
Mercury analysis
Metals chemistry
Metals metabolism
Nucleic Acid Conformation
Silver analysis
DNA chemistry
Fluorescence Resonance Energy Transfer methods
Metals analysis
Nanostructures chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 1520-6882
- Volume :
- 86
- Issue :
- 14
- Database :
- MEDLINE
- Journal :
- Analytical chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 24931422
- Full Text :
- https://doi.org/10.1021/ac5015436