Optical Detection of Mercury(II) in Aqueous Solutions by Using Conjugated Polymers and Label‐Free Oligonucleotides

Liu, Xingfen; Tang, Yanli; Wang, Lihua; Zhang, Juan; Song, Shiping; Fan, Chunhai; Wang, Shu

doi:10.1002/adma.200602578

Cited by 322 publications

(144 citation statements)

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“…In spite of being very sensitive and precise for Hg determination, these methods often require a time-consuming sample preparation step as well as expensive instrumentation. Various colorimetric assays (based on the use of sensitive chromophores or fluorophores [8][9][10][11], polymers [12,13], oligonucleotides [14,15], DNA [16,17], and metal nanoparticles [18][19][20]) have been developed and reported in the literature as convenient and simple alternative methods for the detection of target analytes without the requirement of sophisticated apparatus.…”

Section: Introductionmentioning

confidence: 99%

Application of Starch-Stabilized Silver Nanoparticles as a Colorimetric Sensor for Mercury(II) in 0.005 mol/L Nitric Acid

Vasileva

Alexandrova

Karadjova

2017

Journal of Chemistry

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, and Ni 2+ ) do not interfere under the same conditions, due to the absence of oxidative activity of these ions, which guarantees the high selectivity of the proposed optical sensor towards Hg 2+ . The limits of detection and quantification were found to be 0.9 g L −1 and 2.7 g L −1 , respectively, and relative standard deviations varied in the range 9-12% for Hg content from 0.9 to 12.5 g L −1 and 5-9% for Hg levels from 25 to 500 g L −1 . The method was validated by analysis of CRM Estuarine Water BCR505. A possible mechanism of interaction between AgNPs and Hg 2+ for both concentration ranges was proposed on the basis of UV-Vis, TEM, and SAED analyses.

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Section: Introductionmentioning

confidence: 99%

Application of Starch-Stabilized Silver Nanoparticles as a Colorimetric Sensor for Mercury(II) in 0.005 mol/L Nitric Acid

Vasileva

Alexandrova

Karadjova

2017

Journal of Chemistry

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“…Moreover, they offer advantages of simplicity, rapidity, cost effectiveness and no requirement of any sophisticated instrumentation. Procedures using small molecules, 10À12 DNAzymes, 13À15 oligonucleotides, 16 polymers, 17 and functional nanoparticles 18 have all been developed for the selective detection of Hg 2þ and Ag þ in aqueous solutions. However, most of these methods suffer from low water solubility, complex synthesis procedure, or time-consuming DNA probe preparation.…”

Section: ' Introductionmentioning

confidence: 99%

Blue-to-Red Colorimetric Sensing Strategy for Hg²⁺ and Ag⁺ via Redox-Regulated Surface Chemistry of Gold Nanoparticles

Lou

Chen

Wang

et al. 2011

ACS Appl. Mater. Interfaces

290

168

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Here we report a “blue-to-red” colorimetric method for determination of mercury ions (Hg2+) and silver ions (Ag+) based on stabilization of gold nanoparticles (AuNPs) by redox formed metal coating in the presence of ascorbic acid (AA). AuNPs were first stabilized by Tween 20 in phosphate buffer solution with high ionic strength. In a target ion-free system, the addition of N-acetyl-l-cysteine resulted in the aggregation of Tween 20 stabilized AuNPs for mercapto ligand self-assembled on the surface of AuNPs, which induced the AuNPs to be unstable. This would lead to a color change from red to blue. By contrast, in an aqueous solution with Hg2+ or Ag+, the ions could be reduced with the aid of AA to form Hg–Au alloy or Ag coating on the surface of AuNPs. This metal coating blocked mercapto ligand assembly and AuNPs kept monodispersed after addition of N-acetyl-l-cysteine, exhibiting a red color. Therefore, taking advantage of this mechanism, a “blue-to-red” colorimetric sensing strategy could be established for Hg2+ and Ag+ detection. Compare with the commonly reported aggregation-based method (‘red-to-blue’), the color change from blue to red seems more eye-sensitive, especial in low concentration of target. Moreover, selective analysis of Hg2+ and Ag+ was simply achieved by the redox nature of target ions and the application of classic ion masking agents, avoiding the design and selection of ion chelating moieties and complicated gold surface modification procedure. This method could selectively detect Hg2+ and Ag+ as low as 5 nM and 10 nM in pure water with a linear range of 5 × 10–7 to 1 × 10–5 M for Hg2+ and 1 × 10–6 to 8 × 10–6 M for Ag+, respectively. It was successfully applied to determination of Hg2+ and Ag+ in tap water and drinking water.

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“…Both compounds possess protons that are amenable for direct observation of inter-molecular NOE crosspeaks (Figure 5d) to nucleic acid protons in a radius smaller than 6 Å. In the most common case 52 Fe, 107 Ag, 109 Ag, 111 Cd, 113 Cd, 195 Pt, 199 Hg, 203 Tl, 205 Tl, and 207 Pb. Many have wide chemical shift ranges and can give useful information about coordination geometry and ligand atom identity, as has been shown in proteins [235,236].…”

Section: Paramagnetic Effectsmentioning

confidence: 99%

“…The addition of metal ions can switch nucleic acids between two conformations (e.g., from single-to double-strand, or from hairpin to duplex), which has been taken advantage of for designing biosensors for metal ions (e.g., [104][105][106][107] and Chapter 8) and recently even logical AND and OR gates [108]. Furthermore, metal ions can modify the physico-chemical properties of nucleic acids and thereby extend their natural functional repertoire.…”

Section: Metallated Nucleic Acids For Nanotechnologymentioning

confidence: 99%

Characterization of Metal Ion-Nucleic Acid Interactions in Solution

Pechlaner

Sigel

2011

Metal Ions in Life Sciences

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Metal ions are inextricably involved with nucleic acids due to their polyanionic nature. In order to understand the structure and function of RNAs and DNAs, one needs to have detailed pictures on the structural, thermodynamic, and kinetic properties of metal ion interactions with these biomacromolecules. In this review we first compile the physicochemical properties of metal ions found and used in combination with nucleic acids in solution. The main part then describes the various methods developed over the past decades to investigate metal ion binding by nucleic acids in solution. This includes for example hydrolytic and radical cleavage experiments, mutational approaches, as well as kinetic isotope effects. In addition, spectroscopic techniques like EPR, lanthanide(III) luminescence, IR and Raman as well as various NMR methods are summarized. Aside from gaining knowledge about the thermodynamic properties on the metal ion-nucleic acid interactions, especially NMR can be used to extract information on the kinetics of ligand exchange rates of the metal ions applied. The final section deals with the influence of anions, buffers, and the solvent permittivity on the binding equilibria between metal ions and nucleic acids. Little is known on some of these aspects, but it is clear that these three factors have a large influence on the interaction between metal ions and nucleic acids.

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Optical Detection of Mercury(II) in Aqueous Solutions by Using Conjugated Polymers and Label‐Free Oligonucleotides

Cited by 322 publications

References 36 publications

Application of Starch-Stabilized Silver Nanoparticles as a Colorimetric Sensor for Mercury(II) in 0.005 mol/L Nitric Acid

Application of Starch-Stabilized Silver Nanoparticles as a Colorimetric Sensor for Mercury(II) in 0.005 mol/L Nitric Acid

Blue-to-Red Colorimetric Sensing Strategy for Hg²⁺ and Ag⁺ via Redox-Regulated Surface Chemistry of Gold Nanoparticles

Characterization of Metal Ion-Nucleic Acid Interactions in Solution

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Optical Detection of Mercury(II) in Aqueous Solutions by Using Conjugated Polymers and Label‐Free Oligonucleotides

Cited by 322 publications

References 36 publications

Application of Starch-Stabilized Silver Nanoparticles as a Colorimetric Sensor for Mercury(II) in 0.005 mol/L Nitric Acid

Application of Starch-Stabilized Silver Nanoparticles as a Colorimetric Sensor for Mercury(II) in 0.005 mol/L Nitric Acid

Blue-to-Red Colorimetric Sensing Strategy for Hg2+ and Ag+ via Redox-Regulated Surface Chemistry of Gold Nanoparticles

Characterization of Metal Ion-Nucleic Acid Interactions in Solution

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Blue-to-Red Colorimetric Sensing Strategy for Hg²⁺ and Ag⁺ via Redox-Regulated Surface Chemistry of Gold Nanoparticles