451
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Liu SJ, Nie HG, Jiang JH, Shen GL, Yu RQ. Electrochemical sensor for mercury(II) based on conformational switch mediated by interstrand cooperative coordination. Anal Chem 2009; 81:5724-30. [PMID: 19522530 DOI: 10.1021/ac900527f] [Citation(s) in RCA: 180] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel electrochemical sensor was developed for sensitive and selective detection of mercury(II), based on thymine-Hg2+-thymine (T-Hg2+-T) coordination chemistry. This strategy exploited the cooperativity of proximate poly-T oligonucleotides in coordination with Hg2+. Ferrocene (Fc)-tagged poly-T oligonucleotides were immobilized on the electrode surface via self-assembly of the terminal thiol moiety. In the presence of Hg2+, a pair of poly-T oligonucleotides could cooperatively coordinate with Hg2+, which triggered a conformational reorganization of the poly-T oligonucleotides from flexible single strands to relatively rigid duplexlike complexes, thus drawing the Fc tags away from the electrode with a substantially decreased redox current. The response characteristics of the sensor were thoroughly investigated using capillary electrophoresis and electrochemical measurements. The results revealed that the sensor showed a sensitive response to Hg2+ in a concentration range from 1.0 nM to 2.0 microM, with a detection limit of 0.5 nM. Also, this strategy afforded exquisite selectivity for Hg2+ against a reservoir of other environmentally related metal ions, compared to existing anodic stripping voltammetry (ASV) techniques. In addition, this sensor could be implemented using minimal reagents and working steps with excellent reusability through mild regeneration procedure. It was expected that this cost-effective electrochemical sensor might hold considerable potential in on-site applications of Hg2+ detection.
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Affiliation(s)
- Si-Jia Liu
- State Key Laboratory for Chemo/biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
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452
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Chiang CK, Lin YW, Hu CC, Chang HT. Using electrospray ionization mass spectrometry to explore the interactions among polythymine oligonucleotides, ethidium bromide, and mercury ions. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2009; 20:1834-1840. [PMID: 19640731 DOI: 10.1016/j.jasms.2009.06.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2009] [Revised: 06/10/2009] [Accepted: 06/10/2009] [Indexed: 05/28/2023]
Abstract
We have used electrospray ionization mass spectrometry (ESI-MS) and fluorescence and circular dichroism (CD) spectroscopy to explore the binding of ethidium bromide (EthBr) to non-self-complementary polythymine (polyT) strands in the absence and presence of Hg2+ ions. In the gas phase, ESI-MS revealed that Hg2+ ions have greater affinity, through T-Hg2+-T coordination, toward polyT strands than do other metal ions. These findings are consistent with our fluorescence and CD results obtained in solution; they revealed that more T33-EthBr-Hg2+ complexes existed upon increasing the concentrations of Hg2+ ions (from 0 to 50 microM). Surprisingly, the ESI-MS data indicated that the Hg2+ concentration dependence of the interaction between T33 and EthBr is biphasic. Our ESI-MS data revealed that the T33-EthBr-Hg2+ complexes formed with various stoichiometries depending on their relative concentrations of the components and the length of the DNA strand. When the concentrations of T33/EthBr/Hg2+ were 5/5/2.5 microM and 5/10/7.5 microM, 1:1:1 and 1:1:2 T33-EthBr-Hg2+ complexes were predominantly formed, respectively. Thus, Hg2+-induced DNA conformational changes clearly affect the interactions between DNA and EthBr.
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453
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Jiang Z, Fan Y, Chen M, Liang A, Liao X, Wen G, Shen X, He X, Pan H, Jiang H. Resonance scattering spectral detection of trace Hg2+ using aptamer-modified nanogold as probe and nanocatalyst. Anal Chem 2009; 81:5439-45. [PMID: 19507871 DOI: 10.1021/ac900590g] [Citation(s) in RCA: 122] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Single-strand DNA (ssDNA) was used to modify 10 nm nanogold to obtain an aptamer-modified nanogold resonance scattering (RS) probe (AussDNA) for detection of Hg(2+). In the presence of NaCl, Hg(2+) interacts with AussDNA to form very stable double-strand T-Hg(2+)-T mismatches and release nanogold particles that aggregate to large nanogold clusters causing the RS intensity at 540 nm to be enhanced linearly. On those grounds, 1.3-1667 nM Hg(2+) can be detected rapidly by the aptamer-modified nanogold RS assay, with a detection limit of 0.7 nM Hg(2+). If the large nanogold clusters were removed by membrane filtration, the excess AussDNA in the filtrate solution exhibits a catalytic effect on the new Cu(2)O particle reaction between NH(2)OH and Cu(2+)-EDTA complex at 60 degrees C. The excess AussDNA decreased with the addition of Hg(2+), which led the Cu(2)O particle RS intensity at 602 nm to decrease. The decreased RS intensity (DeltaI(602nm)) had a linear response to Hg(2+) concentration in the range of 0.1-400 nM, with a detection limit of 0.03 nM Hg(2+). This aptamer-modified nanogold catalytic RS method was applied for the detection of Hg(2+) in water samples, with sensitivity, selectivity, and simplicity.
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Affiliation(s)
- Zhiliang Jiang
- Guangxi Key Laboratory of Environmental Engineering, Protection and Assessment, Guangxi Normal University, Guilin 541004, China.
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454
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Lin YW, Liu CW, Chang HT. DNA functionalized gold nanoparticles for bioanalysis. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2009; 1:14-24. [PMID: 32938137 DOI: 10.1039/b9ay00036d] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Gold nanoparticles (Au NPs) have become one of the most interesting sensing materials because of their unique size- and shape-dependent optical properties, high extinction coefficients, and super-quenching capability. Au NPs that are bioconjugated with DNA (DNA-Au NPs) have been demonstrated for selective and sensitive detection of analytes such as mercury(ii) ions, platelet-derived growth factor (PDGF), and adenosine triphosphate (ATP). This review focuses on approaches using DNA-Au NPs for colorimetric, fluorescent, and scattering detection of biopolymers and small solutes. We highlight the important roles that the size and concentration of Au NPs, the length and sequence of DNA, the nature of the capping agents, and the ionic strength and pH of solution play in determining the specificity and sensitivity of the nanosensors for the analytes. The advantages and disadvantages of different detection methods for sensing of interesting analytes using DNA-Au NPs will be discussed.
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Affiliation(s)
- Yang-Wei Lin
- Department of Chemistry, National Taiwan University, 1, Section 4, Roosevelt Road, Taipei, Taiwan.
| | - Chi-Wei Liu
- Department of Chemistry, National Taiwan University, 1, Section 4, Roosevelt Road, Taipei, Taiwan.
| | - Huan-Tsung Chang
- Department of Chemistry, National Taiwan University, 1, Section 4, Roosevelt Road, Taipei, Taiwan.
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455
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Zhang D, Deng M, Xu L, Zhou Y, Yuwen J, Zhou X. The sensitive and selective optical detection of mercury(II) ions by using a phosphorothioate DNAzyme strategy. Chemistry 2009; 15:8117-20. [PMID: 19637166 DOI: 10.1002/chem.200901268] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Dan Zhang
- College of Chemistry and Molecular Sciences, Wuhan University, Hubei, Wuhan 430072, China
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456
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Yigit MV, Mishra A, Tong R, Cheng J, Wong GC, Lu Y. Inorganic Mercury Detection and Controlled Release of Chelating Agents from Ion-Responsive Liposomes. ACTA ACUST UNITED AC 2009; 16:937-42. [DOI: 10.1016/j.chembiol.2009.08.011] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2009] [Revised: 08/16/2009] [Accepted: 08/31/2009] [Indexed: 11/26/2022]
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457
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Xu W, Xue X, Li T, Zeng H, Liu X. Ultrasensitive and Selective Colorimetric DNA Detection by Nicking Endonuclease Assisted Nanoparticle Amplification. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200901772] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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458
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Cao RG, Zhu B, Li J, Xu D. Oligonucleotides-based biosensors with high sensitivity and selectivity for mercury using electrochemical impedance spectroscopy. Electrochem commun 2009. [DOI: 10.1016/j.elecom.2009.07.029] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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459
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Xu W, Xue X, Li T, Zeng H, Liu X. Ultrasensitive and Selective Colorimetric DNA Detection by Nicking Endonuclease Assisted Nanoparticle Amplification. Angew Chem Int Ed Engl 2009; 48:6849-52. [DOI: 10.1002/anie.200901772] [Citation(s) in RCA: 351] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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460
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Wen G, Liang A, Jiang Z, Liao X, Li J, Jiang H. Resonance scattering spectral detection of ultratrace Hg(II) using herring sperm DNA modified nanogold probe as catalyst. LUMINESCENCE 2009; 25:373-7. [DOI: 10.1002/bio.1161] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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461
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Zhu Z, Su Y, Li J, Li D, Zhang J, Song S, Zhao Y, Li G, Fan C. Highly Sensitive Electrochemical Sensor for Mercury(II) Ions by Using a Mercury-Specific Oligonucleotide Probe and Gold Nanoparticle-Based Amplification. Anal Chem 2009; 81:7660-6. [DOI: 10.1021/ac9010809] [Citation(s) in RCA: 393] [Impact Index Per Article: 26.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Zhiqiang Zhu
- Department of Biochemistry and National Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing 210093, China, Laboratory of Physical Biology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China, and School of Life Sciences, Sichuan University, Chengdu 610064, China
| | - Yuanyuan Su
- Department of Biochemistry and National Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing 210093, China, Laboratory of Physical Biology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China, and School of Life Sciences, Sichuan University, Chengdu 610064, China
| | - Jiang Li
- Department of Biochemistry and National Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing 210093, China, Laboratory of Physical Biology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China, and School of Life Sciences, Sichuan University, Chengdu 610064, China
| | - Di Li
- Department of Biochemistry and National Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing 210093, China, Laboratory of Physical Biology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China, and School of Life Sciences, Sichuan University, Chengdu 610064, China
| | - Jiong Zhang
- Department of Biochemistry and National Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing 210093, China, Laboratory of Physical Biology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China, and School of Life Sciences, Sichuan University, Chengdu 610064, China
| | - Shiping Song
- Department of Biochemistry and National Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing 210093, China, Laboratory of Physical Biology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China, and School of Life Sciences, Sichuan University, Chengdu 610064, China
| | - Yun Zhao
- Department of Biochemistry and National Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing 210093, China, Laboratory of Physical Biology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China, and School of Life Sciences, Sichuan University, Chengdu 610064, China
| | - Genxi Li
- Department of Biochemistry and National Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing 210093, China, Laboratory of Physical Biology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China, and School of Life Sciences, Sichuan University, Chengdu 610064, China
| | - Chunhai Fan
- Department of Biochemistry and National Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing 210093, China, Laboratory of Physical Biology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China, and School of Life Sciences, Sichuan University, Chengdu 610064, China
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462
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WU H, LIU X, JIANG J, SHEN G, YU R. An Oligonucleotide-based Fluorescence Sensor for Mercury(II) in Aqueous Solutions. CHINESE J CHEM 2009. [DOI: 10.1002/cjoc.200990260] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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463
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Kim S, Ohulchanskyy TY, Bharali D, Chen Y, Pandey RK, Prasad PN. Organically Modified Silica Nanoparticles with Intraparticle Heavy-Atom Effect on the Encapsulated Photosensitizer for Enhanced Efficacy of Photodynamic Therapy. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2009; 113:12641-12644. [PMID: 23795227 DOI: 10.1021/jp908902k] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We report a novel nanoassembly formulation for photodynamic therapy, which is composed of covalently iodine-concentrated organically modified silica (ORMOSIL) nanoparticles (diameter <30 nm) and a hydrophobic photosensitizer embedded therein. Comparative studies with iodinated and non-iodinated nanoparticles have demonstrated that the intraparticle external heavy-atom effect on the encapsulated photosensitizer molecules significantly enhances the efficiency of 1O2 generation, and thereby, the in vitro PDT efficacy.
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Affiliation(s)
- Sehoon Kim
- The Institute for Lasers, Photonics and Biophotonics, Department of Chemistry, State University of New York, Buffalo, New York 14260-3000, USA ; Biomedical Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-791, Korea
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464
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Fan Y, Liu Z, Wang L, Zhan J. Synthesis of Starch-Stabilized Ag Nanoparticles and Hg Recognition in Aqueous Media. NANOSCALE RESEARCH LETTERS 2009; 4:1230-1235. [PMID: 20596276 PMCID: PMC2894331 DOI: 10.1007/s11671-009-9387-6] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2009] [Accepted: 07/01/2009] [Indexed: 05/11/2023]
Abstract
The starch-stabilized Ag nanoparticles were successfully synthesized via a reduction approach and characterized with SPR UV/Vis spectroscopy, TEM, and HRTEM. By utilizing the redox reaction between Ag nanoparticles and Hg(2+), and the resulted decrease in UV/Vis signal, we develop a colorimetric method for detection of Hg(2+) ion. A linear relationship stands between the absorbance intensity of the Ag nanoparticles and the concentration of Hg(2+) ion over the range from 10 ppb to 1 ppm at the absorption of 390 nm. The detection limit for Hg(2+) ions in homogeneous aqueous solutions is estimated to be ~5 ppb. This system shows excellent selectivity for Hg(2+) over other metal ions including Na(+), K(+), Ba(2+), Mg(2+), Ca(2+), Fe(3+), and Cd(2+). The results shown herein have potential implications in the development of new colorimetric sensors for easy and selective detection and monitoring of mercuric ions in aqueous solutions. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s11671-009-9387-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yingju Fan
- School of Chemistry and Chemical Engineering, Shandong University, 250100, Jinan, People’s Republic of China
- School of Chemistry and Chemical Engineering, University of Jinan, 250022, Jinan, People’s Republic of China
| | - Zhen Liu
- School of Chemistry and Chemical Engineering, Shandong University, 250100, Jinan, People’s Republic of China
| | - Le Wang
- School of Chemistry and Chemical Engineering, Shandong University, 250100, Jinan, People’s Republic of China
| | - Jinhua Zhan
- School of Chemistry and Chemical Engineering, Shandong University, 250100, Jinan, People’s Republic of China
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465
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Lu N, Shao C, Deng Z. Colorimetric Hg2+ detection with a label-free and fully DNA-structured sensor assembly incorporating G-quadruplex halves. Analyst 2009; 134:1822-5. [PMID: 19684905 DOI: 10.1039/b908018j] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A sensitive and fully DNA-structured ion sensor was built by integrating polyT sequences for highly selective Hg2+ recognitions and two flanking G-quadruplex halves for allosteric signal transductions. The construction of this sensor was very easy that allowed a cost-effective detection of Hg2+ with a limit of detection of 4.5 nM, which was lower than the 10 nM toxic level for drinkable water as regulated by the US's EPA. The strategy employed for the construction of this sensor may be further extended to other sensors through a rational structural fusion between re-engineered aptameric and enzymic DNA sequences.
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Affiliation(s)
- Na Lu
- Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China
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466
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Yu CJ, Cheng TL, Tseng WL. Effects of Mn2+ on oligonucleotide-gold nanoparticle hybrids for colorimetric sensing of Hg2+: improving colorimetric sensitivity and accelerating color change. Biosens Bioelectron 2009; 25:204-10. [PMID: 19631521 DOI: 10.1016/j.bios.2009.06.038] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2009] [Revised: 06/08/2009] [Accepted: 06/25/2009] [Indexed: 11/27/2022]
Abstract
In this paper, we present a simple and rapid colorimetric assay--using the polythymine oligonucleotide T(33), citrate-capped gold nanoparticles (AuNPs), and phosphate-buffer saline (PBS) in the presence of Mn(2+)--for the highly selective and sensitive detection of Hg(2+) in an aqueous solution. Citrate-capped AuNPs adsorbed on randomly coiled T(33) were dispersed well in PBS because of strong electrostatic repulsion between DNA molecules. In the presence of Hg(2+), the formation of Hg(2+)-T(33) complexes enabled the removal of T(33) molecules from the NP surface, resulting in salt-induced NP aggregation. However, the T(33)-capped AuNPs (T(33)-AuNPs) were dispersed in PBS solution after the addition of 1.0 microM Hg(2+), indicating that T(33)-AuNPs had poor colorimetric sensitivity toward Hg(2+). We uncovered that the addition of Mn(2+) to a solution containing 0.75 nM T(33)-AuNPs and 0.2x PBS resulted in an acceleration of the analysis time (within 5 min) and a 100-fold sensitivity improvement for the detection of Hg(2+). As a result, the present approach enables the analysis of Hg(2+) with a minimum detectable concentration that corresponds to 10 nM. This is probably attributed to that Mn(2+) binds strongly to the phosphate backbone of DNA, thereby accelerating Hg(2+)-induced aggregation of the T(33)-AuNPs. Because Mn(2+) can stabilize the folded structure of the Hg(2+)-T(33) complex, Hg(2+) facilitates the removal of T(33) from the NP surface in the presence of Mn(2+). This probe was successfully applied to the determination of Hg(2+) in pond water.
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Affiliation(s)
- Cheng-Ju Yu
- Department of Chemistry, National Sun Yat-sen University, Kaohsiung, Taiwan
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467
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Liu ZD, Li YF, Ling J, Huang CZ. A localized surface plasmon resonance light-scattering assay of mercury (II) on the basis of Hg(2+)-DNA complex induced aggregation of gold nanoparticles. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2009; 43:5022-7. [PMID: 19673301 DOI: 10.1021/es9001983] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
It is known that localized surface plasmon resonance (LSPR) is responsible for the surface-enhanced spectroscopic processes of metallic nanoparticles and thus LSPR spectroscopy has become a powerful technique for chemical and biological purposes. In this contribution, we present a simple homogeneous Hg2+ assay by measuring enhanced LSPR scattering signals resulted from Hg(2+)-DNA complex induced aggregation of gold nanoparticles (AuNPs). In a medium of pH 7.4 tris-HCl buffer containing 0.05 M NaCl, single-stranded oligonucletides with the sequence of 5'-d(T6)-3' (poly-T6 ssDNA), can be selectively adsorbed onto the surface of gold colloids, stabilizing the AuNPs against aggregation. If Hg(2+)-DNA complex via Hg(2+)-mediated thymine-Hg(2+)-thymine (T-Hg(2+)-T) is formed, however, the adsorption of poly-T6 ssDNA onto the surface of gold colloids gets reduced, and then aggregation of the AuNPs occurs owing to the decrease of the electrostatic repulsion between AuNPs. Consequently, strong LSPR scattering signals resulting from the aggregates of AuNPs could be visually observed under a dark field microscope and easily be measured with a common spectrofluorometer. The LSPR scattering intensities characterized at 556.0 nm were found to be proportional to the concentration of Hg2+ ions in the range of 4.0 x 10(-8) to 6.0 x 10(-7) M with the limit of determination (3sigma) of 1.0 nM. Compared with reported colorimetric methods, our present approaches display the advantages of higher sensitivity.
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Affiliation(s)
- Zhong De Liu
- Education Ministry Key Laboratory on Luminescence and Real-Time Analysis, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China
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468
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469
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470
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471
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Highly sensitive fluorescent sensor for mercury ion based on photoinduced charge transfer between fluorophore and pi-stacked T-Hg(II)-T base pairs. Talanta 2009; 79:775-9. [PMID: 19576444 DOI: 10.1016/j.talanta.2009.05.001] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2009] [Revised: 05/04/2009] [Accepted: 05/04/2009] [Indexed: 11/21/2022]
Abstract
A novel and simple oligodeoxyribonucleotide-based sensor with single fluorophore-labeled for mercury ion sensing was reported. An oligodeoxyribonucleotide poly(dT) was labeled with fluorescein as donor. Based on the specific binding of Hg(II) to T-T mismatch base pairs, the formation of pi-stacked [T-Hg(II)-T] with "sandwich" structure on the addition of Hg(II) ions facilitates the electron transfer via photoinduced charge transfer (PCT), which creates an additional nonradiative decay channel for excited fluorophore and triggers the fluorescence to be quenched. The pi-stacked [T-Hg(II)-T] functioned not only as mercury ion recognition but also as an electron acceptor to quench the donor. A linear relationship was observed over the range of 0-1.0 microM with the detection limit of 20 nM for mercury ions. The fluorescence quenching phenomenon and quenching mechanism, reliability and selectivity of the system were investigated in detail.
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472
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Affiliation(s)
- Juewen Liu
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, USA
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473
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Wang Z, Lu Y. Functional DNA directed assembly of nanomaterials for biosensing. JOURNAL OF MATERIALS CHEMISTRY 2009; 19:10.1039/B813939C. [PMID: 24307758 PMCID: PMC3846351 DOI: 10.1039/b813939c] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review summarizes recent progress in the development of biosensors by integrating functional DNA molecules with different types of nanomaterials, including metallic nanoparticles, semiconductor nanoparticles, magnetic nanoparticles, and carbon nanotubes. On one hand, advances in nanoscale science and technology have generated nanomaterials with unique optical, electrical, magnetic and catalytic properties. On the other hand, recent progress in biology has resulted in functional DNAs, a new class of DNAs that can either bind to a target molecule (known as aptamers) or perform catalytic reactions (known as DNAzymes) with the ability to recognize a broad range of targets from metal ions to organic molecules, proteins and cells specifically. By taking advantage of the strengths in both fields, the physical and chemical properties of nanomaterials have been modulated by the target recognition and catalytic activity of functional DNAs in the presence of a target analyte, resulting in a large number of colorimetric, fluorescent, electrochemical, surface-enhanced Raman scattering and magnetic resonance imaging sensors for the detection of a broad range of analytes with high sensitivity and selectivity.
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Affiliation(s)
- Zidong Wang
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 W. Green Str., Urbana, IL 61801, USA
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, 405 N. Mathews Ave., Urbana, IL 61801, USA
| | - Yi Lu
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 W. Green Str., Urbana, IL 61801, USA
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, 405 N. Mathews Ave., Urbana, IL 61801, USA
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S. Mathews Ave., Urbana, IL 61801, USA. Fax: (+1) 217-244-3186; Tel: (+1) 217-333-2619
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474
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Wang Y, Liu B. Amplified Fluorescence Turn-On Assay for Mercury(II) Detection and Quantification based on Conjugated Polymer and Silica Nanoparticles. Macromol Rapid Commun 2009; 30:498-503. [DOI: 10.1002/marc.200800727] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2008] [Revised: 01/02/2009] [Accepted: 01/07/2009] [Indexed: 11/06/2022]
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475
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Liu X, Qi C, Bing T, Cheng X, Shangguan D. Highly Selective Phthalocyanine−Thymine Conjugate Sensor for Hg2+ Based on Target Induced Aggregation. Anal Chem 2009; 81:3699-704. [DOI: 10.1021/ac9003375] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiangjun Liu
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Cui Qi
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Tao Bing
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Xiaohong Cheng
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Dihua Shangguan
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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476
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Xu X, Wang J, Jiao K, Yang X. Colorimetric detection of mercury ion (Hg2+) based on DNA oligonucleotides and unmodified gold nanoparticles sensing system with a tunable detection range. Biosens Bioelectron 2009; 24:3153-8. [PMID: 19376695 DOI: 10.1016/j.bios.2009.03.025] [Citation(s) in RCA: 197] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2009] [Revised: 02/28/2009] [Accepted: 03/17/2009] [Indexed: 11/29/2022]
Abstract
Here, we report a simple and sensitive colorimetric detection method for Hg(2+) ions with a tunable detection range based on DNA oligonucleotides and unmodified gold nanoparticles (DNA/AuNPs) sensing system. Complementary DNA strands with T-T mismatches could effectively protect AuNPs from salt-induced aggregation. While in the presence of Hg(2+) ions T-Hg(2+)-T coordination chemistry leads to the formation of DNA duplexes, and AuNPs are less well protected thus aggregate at the same salt concentration, accompanying by color change from red to blue. By rationally varying the number of T-T mismatches in DNA oligonucleotides, the detection range could be tuned. Employing duplex oligonucleotides with 4 T-T mismatches in the sensing system, a sensitive linear range for Hg(2+) ions from 0 to 5 microM and a detection limit of 0.5 microM are obtained. Adding the number of T-T mismatches to 6 and 8, the assay region is enlarged and linear range is tuned. A low proportion of T-T mismatches makes the detection range narrow but the sensitivity high while a high proportion influences the detection limit but enlarges assay region. Besides, the sensor also shows a good selectivity for Hg(2+).
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Affiliation(s)
- Xiaowen Xu
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China
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477
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Li T, Shi L, Wang E, Dong S. Silver-Ion-Mediated DNAzyme Switch for the Ultrasensitive and Selective Colorimetric Detection of Aqueous Ag+and Cysteine. Chemistry 2009; 15:3347-50. [DOI: 10.1002/chem.200900056] [Citation(s) in RCA: 231] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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478
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Tang B, Ding B, Xu K, Tong L. Use of Selenium to Detect Mercury in Water and Cells: An Enhancement of the Sensitivity and Specificity of a Seleno Fluorescent Probe. Chemistry 2009; 15:3147-51. [DOI: 10.1002/chem.200802165] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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479
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Long Y, Jiang D, Zhu X, Wang J, Zhou F. Trace Hg2+ Analysis via Quenching of the Fluorescence of a CdS-Encapsulated DNA Nanocomposite. Anal Chem 2009; 81:2652-7. [DOI: 10.1021/ac802592r] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yunfei Long
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, People’s Republic of China 410083, and Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, California 90032
| | - Dianlu Jiang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, People’s Republic of China 410083, and Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, California 90032
| | - Xu Zhu
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, People’s Republic of China 410083, and Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, California 90032
| | - Jianxiu Wang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, People’s Republic of China 410083, and Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, California 90032
| | - Feimeng Zhou
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, People’s Republic of China 410083, and Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, California 90032
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480
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Li T, Dong S, Wang E. Label-Free Colorimetric Detection of Aqueous Mercury Ion (Hg2+) Using Hg2+-Modulated G-Quadruplex-Based DNAzymes. Anal Chem 2009; 81:2144-9. [DOI: 10.1021/ac900188y] [Citation(s) in RCA: 422] [Impact Index Per Article: 28.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Tao Li
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China, and Graduate School of the Chinese Academy of Sciences, Beijing, 100039, China
| | - Shaojun Dong
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China, and Graduate School of the Chinese Academy of Sciences, Beijing, 100039, China
| | - Erkang Wang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China, and Graduate School of the Chinese Academy of Sciences, Beijing, 100039, China
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481
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Okamoto I, Iwamoto K, Watanabe Y, Miyake Y, Ono A. Metal-Ion Selectivity of Chemically Modified Uracil Pairs in DNA Duplexes. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200804952] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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482
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Label-free aptamer-based colorimetric detection of mercury ions in aqueous media using unmodified gold nanoparticles as colorimetric probe. Anal Bioanal Chem 2009; 393:2051-7. [PMID: 19198811 DOI: 10.1007/s00216-009-2640-0] [Citation(s) in RCA: 166] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2008] [Revised: 01/18/2009] [Accepted: 01/21/2009] [Indexed: 10/21/2022]
Abstract
We report a simple and sensitive aptamer-based colorimetric detection of mercury ions (Hg(2+)) using unmodified gold nanoparticles as colorimetric probe. It is based on the fact that bare gold nanoparticles interact differently with short single-strand DNA and double-stranded DNA. The anti-Hg(2+) aptamer is rich in thymine (T) and readily forms T-Hg(2+)-T configuration in the presence of Hg(2+). By measuring color change or adsorption ratio, the bare gold nanoparticles can effectively differentiate the Hg(2+)-induced conformational change of the aptamer in the presence of a given salt with high concentration. The assay shows a linear response toward Hg(2+) concentration through a five-decade range of 1 x 10(-4) mol L(-1) to 1 x 10(-9) mol L(-1). Even with the naked eye, we could identify micromolar Hg(2+) concentrations within minutes. By using the spectrometric method, the detection limit was improved to the nanomolar range (0.6 nM). The assay shows excellent selectivity for Hg(2+) over other metal cations including K(+), Ba(2+), Ni(2+), Pb(2+), Cu(2+), Cd(2+), Mg(2+), Ca(2+), Zn(2+), Al(3+), and Fe(3+). The major advantages of this Hg(2+) assay are its water-solubility, simplicity, low cost, visual colorimetry, and high sensitivity. This method provides a potentially useful tool for the Hg(2+) detection.
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483
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Bio-inspired colorimetric detection of Hg2+ and Pb2+ heavy metal ions using Au nanoparticles. Anal Bioanal Chem 2009; 394:33-46. [DOI: 10.1007/s00216-008-2594-7] [Citation(s) in RCA: 183] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2008] [Revised: 12/18/2008] [Accepted: 12/19/2008] [Indexed: 12/26/2022]
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484
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Okamoto I, Iwamoto K, Watanabe Y, Miyake Y, Ono A. Metal-Ion Selectivity of Chemically Modified Uracil Pairs in DNA Duplexes. Angew Chem Int Ed Engl 2009; 48:1648-51. [DOI: 10.1002/anie.200804952] [Citation(s) in RCA: 101] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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485
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Ren X, Xu QH. Highly sensitive and selective detection of mercury ions by using oligonucleotides, DNA intercalators, and conjugated polymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:29-31. [PMID: 19035822 DOI: 10.1021/la803191v] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
In this letter, we demonstrated a practical scheme for the detection of mercury ions in aqueous media at room temperature with high sensitivity and selectivity by using a combination of oligonucleotides, DNA intercalators, and conjugated polymers. This scheme combines the advantages of specific binding interactions between Hg2+ and thymine and optical amplification properties of conjugated polymers. This method is label-free, low cost, and simple to use, and all of the materials are commercially available. It works in a "mix-and-detect" manner. The limit of detection could be improved to 0.27 nM, which is much lower than the maximum level of mercury permitted by the EPA in drinking water. This scheme could also be potentially used as a two-photon sensor for detecting mercury ions in a biological environment where deep penetration is required. A detection limit of as low as approximately 6 nM could be achieved under two-photon excitation.
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Affiliation(s)
- Xinsheng Ren
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
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486
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Zhou P, Meng Q, He G, Wu H, Duan C, Quan X. Highly sensitive fluorescence probe based on functional SBA-15 for selective detection of Hg2+in aqueous media. ACTA ACUST UNITED AC 2009; 11:648-53. [DOI: 10.1039/b815287j] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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487
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Jiang T, Liu R, Huang X, Feng H, Teo W, Xing B. Colorimetric screening of bacterial enzyme activity and inhibition based on the aggregation of gold nanoparticles. Chem Commun (Camb) 2009:1972-4. [DOI: 10.1039/b818853j] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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488
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Tan ZQ, Liu JF, Liu R, Yin YG, Jiang GB. Visual and colorimetric detection of Hg2+ by cloud point extraction with functionalized gold nanoparticles as a probe. Chem Commun (Camb) 2009:7030-2. [DOI: 10.1039/b915237g] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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489
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Li T, Li B, Wang E, Dong S. G-quadruplex-based DNAzyme for sensitive mercury detection with the naked eye. Chem Commun (Camb) 2009:3551-3. [DOI: 10.1039/b903993g] [Citation(s) in RCA: 175] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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490
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Yang R, Jin J, Long L, Wang Y, Wang H, Tan W. Reversible molecular switching of molecular beacon: controlling DNA hybridization kinetics and thermodynamics using mercury(ii) ions. Chem Commun (Camb) 2009:322-4. [DOI: 10.1039/b816638b] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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491
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Li J, Yao J, Zhong W. Membrane blotting for rapid detection of mercury(ii) in water. Chem Commun (Camb) 2009:4962-4. [DOI: 10.1039/b910251e] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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492
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Jiang W, Wang W. A selective and sensitive “turn-on” fluorescent chemodosimeter for Hg2+ in aqueous media via Hg2+ promoted facile desulfurization–lactonization reaction. Chem Commun (Camb) 2009:3913-5. [PMID: 19662250 DOI: 10.1039/b903606g] [Citation(s) in RCA: 108] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Wei Jiang
- Department of Chemistry & Chemical Biology, University of New Mexico, Albuquerque, NM 87131, USA
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493
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Kong RM, Zhang XB, Zhang LL, Jin XY, Huan SY, Shen GL, Yu RQ. An ultrasensitive electrochemical “turn-on” label-free biosensor for Hg2+with AuNP-functionalized reporter DNA as a signal amplifier. Chem Commun (Camb) 2009:5633-5. [DOI: 10.1039/b911163h] [Citation(s) in RCA: 112] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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494
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Ye BC, Yin BC. Highly sensitive detection of mercury(II) ions by fluorescence polarization enhanced by gold nanoparticles. Angew Chem Int Ed Engl 2008; 47:8386-9. [PMID: 18833550 DOI: 10.1002/anie.200803069] [Citation(s) in RCA: 341] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Bang-Ce Ye
- Laboratory of Biosystems and Microanalysis, State Key Laboratory of Bioreactor Engineering, East China University of Science & Technology, Meilong RD 130, Shanghai, 200237, PR China.
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495
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Wang H, Wang Y, Jin J, Yang R. Gold Nanoparticle-Based Colorimetric and “Turn-On” Fluorescent Probe for Mercury(II) Ions in Aqueous Solution. Anal Chem 2008; 80:9021-8. [DOI: 10.1021/ac801382k] [Citation(s) in RCA: 435] [Impact Index Per Article: 27.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Hao Wang
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Yongxiang Wang
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Jianyu Jin
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Ronghua Yang
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
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496
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Ye BC, Yin BC. Highly Sensitive Detection of Mercury(II) Ions by Fluorescence Polarization Enhanced by Gold Nanoparticles. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200803069] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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497
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Wang Z, Heon Lee J, Lu Y. Highly sensitive "turn-on" fluorescent sensor for Hg2+ in aqueous solution based on structure-switching DNA. Chem Commun (Camb) 2008:6005-7. [PMID: 19030567 DOI: 10.1039/b812755g] [Citation(s) in RCA: 244] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A simple design of "turn-on" fluorescent sensor for mercury was demonstrated based on structure-switching DNA with a low detection limit of 3.2 nM and high selectivity.
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Affiliation(s)
- Zidong Wang
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 W. Green Str., Urbana, IL-61801, USA
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498
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Zhao W, Brook MA, Li Y. Design of Gold Nanoparticle-Based Colorimetric Biosensing Assays. Chembiochem 2008; 9:2363-71. [DOI: 10.1002/cbic.200800282] [Citation(s) in RCA: 621] [Impact Index Per Article: 38.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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499
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Yang R, Tang Z, Yan J, Kang H, Kim Y, Zhu Z, Tan W. Noncovalent assembly of carbon nanotubes and single-stranded DNA: an effective sensing platform for probing biomolecular interactions. Anal Chem 2008; 80:7408-13. [PMID: 18771233 DOI: 10.1021/ac801118p] [Citation(s) in RCA: 276] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this paper, we report the assembly of single-walled carbon nanotubes (SWNTs) and single-stranded DNA to develop a new class of fluorescent biosensors which are able to probe and recognize biomolecular interactions in a homogeneous format. This novel sensing platform consists of a structure formed by the interaction of SWNTs and dye-labeled DNA oligonucleotides such that the proximity of the nanotube to the dye effectively quenches the fluorescence in the absence of a target. Conversely, and very importantly, the competitive binding of a target DNA or protein with SWNTs for the oligonucleotide results in the restoration of fluorescence signal in increments relative to the fluorescence without a target. This signaling mechanism makes it possible to detect the target by fluorescence spectroscopy. In the present study, the schemes for such fluorescence changes were examined by fluorescence anisotropy and fluorescence intensity measurements for DNA hybridization and aptamer-protein interaction studies.
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Affiliation(s)
- Ronghua Yang
- Department of Chemistry, Shands Cancer Center and University of Florida Genetics Institute, University of Florida, Gainesville, Florida 32611-7200, USA
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500
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Lin YW, Ho HT, Huang CC, Chang HT. Fluorescence detection of single nucleotide polymorphisms using a universal molecular beacon. Nucleic Acids Res 2008; 36:e123. [PMID: 18753149 PMCID: PMC2577337 DOI: 10.1093/nar/gkn537] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
We present a simple and novel assay—employing a universal molecular beacon (MB) in the presence of Hg2+—for the detection of single nucleotide polymorphisms (SNPs) based on Hg2+–DNA complexes inducing a conformational change in the MB. The MB (T7-MB) contains a 19-mer loop and a stem of a pair of seven thymidine (T) bases, a carboxyfluorescein (FAM) unit at the 5′-end, and a 4-([4-(dimethylamino)phenyl]azo)benzoic acid (DABCYL) unit at the 3′-end. Upon formation of Hg2+–T7-MB complexes through T–Hg2+–T bonding, the conformation of T7-MB changes from a random coil to a folded structure, leading to a decreased distance between the FAM and DABCYL units and, hence, increased efficiency of fluorescence resonance energy transfer (FRET) between the FAM and DABCYL units, resulting in decreased fluorescence intensity of the MB. In the presence of complementary DNA, double-stranded DNA complexes form (instead of the Hg2+–T7-MB complexes), with FRET between the FAM and DABCYL units occurring to a lesser extent than in the folded structure. Under the optimal conditions (20 nM T7-MB, 20 mM NaCl, 1.0 μM Hg2+, 5.0 mM phosphate buffer solution, pH 7.4), the linear plot of the fluorescence intensity against the concentration of perfectly matched DNA was linear over the range 2–30 nM (R2 = 0.991), with a limit of detection of 0.5 nM at a signal-to-noise ratio of 3. This new probe provides higher selectivity toward DNA than that exhibited by conventional MBs.
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Affiliation(s)
- Yang-Wei Lin
- Department of Chemistry, National Taiwan University 1, Taipei, Taiwan
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