Application of DNA condensation for removal of mercury ions from aqueous solutions

Zinchenko, Anatoly; Sakai, Hiroomi; Matsuoka, Saori; Murata, Shizuaki

doi:10.1016/j.jhazmat.2009.01.121

Cited by 21 publications

(16 citation statements)

References 55 publications

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“…It can be deduced from the curve that adsorption of Hg(II) reached equilibrium within 5 min, and that the adsorption capacity of the assembled DNA was about 75 mg g −1 . The value is 1.8 times the total number of DNA base pairs on the nanoparticle surface, and is close to a previously reported value of 1.75, in which Hg(II) was removed by means of DNA condensation in the presence of cetyltrimethylammonium bromide . The PAMAM‐DNA complexation leads to DNA condensation; the condensed DNA can uptake more Hg(II) because, besides internal (cross‐linking) bonding, it can coordinate mercury ion via external bonding …”

Section: Resultssupporting

confidence: 88%

“…The residual Hg(II) and MeHg(I) in the aqueous phase was determined by dithizone extraction–UV spectrophotometry technique . Dithizone was purified before use.…”

Section: Methodsmentioning

confidence: 99%

“…Despite the fact that thymine‐rich single‐stranded DNAs have been extensively employed in sensitive detection of Hg(II) based on the strong base‐selective DNA‐mercury interaction, this family of polyanions could not be used directly as sorbents for mercury removal because they are water‐soluble. Zinchenko et al utilized cetyltrimethylammonium bromide as condensing reagent and zeolite as flocculant to precipitate out the Hg(II)‐loaded DNA fragments. The strategy offered a percentage removal of 95% under optimum conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Another advantage of utilizing DNA fragments in water treatment is that these mercury‐removing reagents are non‐toxic. Except pathogenic viruses, DNA and nucleic acids are never considered hazardous to humans or the environment . Using Fe 3 O 4 ‐SiO 2 ‐PAMAM@DNA, the water‐soluble DNA fragments can be readily collected after adsorption, circumventing the introduction of cationic surfactant to water in the condensation technique.…”

Section: Introductionmentioning

confidence: 99%

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DNA fragments assembled on polyamidoamine‐grafted core‐shell magnetic silica nanoparticles for removal of mercury(II) and methylmercury(I)

Liang

et al. 2016

J of Chemical Tech & Biotech

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BACKGROUND Hg(II) and MeHg(I) are toxic pollutants causing wide concerns. Polyamidoamine‐grafted magnetic silica nanoparticles (Fe3O4‐SiO2‐PAMAMs) were synthesized as beads, on which herring sperm DNA fragments were immobilized as reacting moieties for removal of Hg(II) and MeHg(I) from water matrices. The factors influencing the removal, such as DNA fragments, generation of the polyamidoamine spacers and pH, were studied. Further, the adsorption mechanisms were explored by means of adsorption kinetics and isotherms. RESULTS Assembling DNA fragments on the polyamidoamine‐grafted beads promoted sharply the removal of both Hg(II) and MeHg(I). Adsorptions of Hg(II) and MeHg(I) followed pseudo‐second‐order kinetics; but their adsorption isotherms obeyed Langmuir and Freundlich models, respectively. Under the optimum conditions, the adsorption equilibrium time was approximately 5 min for Hg(II) and 5 s for MeHg(I) with maximum percentage removals of ∼95% and ∼90%, respectively. The adsorbent could be regenerated easily without significant decrease in removal efficiencies. CONCLUSION The Fe3O4‐SiO2‐PAMAM beads could bind DNA steadily, and the DNA fragments interacted strongly with mercury species. The strategy enabled the water‐soluble DNAs to work as efficient removing reagents for rapid and cost‐effective removal of Hg(II) and MeHg(I). © 2016 Society of Chemical Industry

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Section: Resultssupporting

confidence: 88%

“…The residual Hg(II) and MeHg(I) in the aqueous phase was determined by dithizone extraction–UV spectrophotometry technique . Dithizone was purified before use.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

DNA fragments assembled on polyamidoamine‐grafted core‐shell magnetic silica nanoparticles for removal of mercury(II) and methylmercury(I)

Liang

et al. 2016

J of Chemical Tech & Biotech

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show abstract

“…For example, glass-bead-immobilized DNA has been reported to be effective for the removal of dioxin and polychlorinated biphenyl derivatives [4][5][6][7]. Other studies have demonstrated the DNAassisted removal of heavy metal ions by precipitation of DNA complexes [8,9], removal of toxic aromatic organic compounds from wastewater through ultra-filtration and adsorption [10,11] as well as from contaminated soil through washing with DNA solutions [12].…”

Section: Introductionmentioning

confidence: 99%

Uptake of aromatic compounds by DNA: Toward the environmental application of DNA for cleaning water

Fernández-Solis

Kuroda

Zinchenko

et al. 2015

Colloids and Surfaces B: Biointerfaces

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Extraction of Noble and Rare‐Earth Metals from Aqueous Solutions by DNA Cross‐Linked Hydrogels

Maeda¹,

Zinchenko²,

Lopatina³

et al. 2013

ChemPlusChem

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Technologies for the accumulation of noble and rare-earth elements have attracted significant attention in the past decade owing to their increasing industrial demand. Chitosan, as well as other compounds with relatively high amine functional group content, have already been shown to be efficient, inexpensive, and environmentally friendly adsorbents of these valuable metals. [1] Complexation of DNA with many metal ions is also well known [2] and the high affinity of DNA phosphates for various rare-metal ions was demonstrated in recent reports by Takahashi et al. [3] Although originally only the biological aspect of DNA was intensively investigated, many studies focused on the application of DNA as a functional material. [4] For example, we [5] and others [6] have successfully demonstrated the application of DNA for the extraction of hazardous metal ions and organic contaminants from aqueous solutions. Similarly, the application of DNA for the extraction of noble and rare-metal ions can be considered. However, owing to the high colloidal stability of DNA in aqueous solution, either deposition of DNA on a suitable solid substrate (e.g., inorganic micro-beads used in columns [6b] ) or post-treatment of DNA complexes with condensation chemicals to induce DNA phase separation from the aqueous phase, [5a] are required.Herein, we propose a single-step extraction of noble-metal (Au, Pd) and rare-earth (Yb) ions from aqueous solutions by using a DNA hydrogel, which possesses intrinsic DNA affinity to the metal ions. The DNA hydrogel was prepared according to a modified procedure reported by Tanaka and Amiya, [7] who studied DNA hydrogels in relation to phase transition in lowpolar solvents. DNA is a suitable natural polymer for the collection of metal ions because the amine and phosphate groups of DNA can act as chelating sites for metal ions.Typically, the sodium salt of DNA from salmon milt (0.1 g) was mixed with MilliQ water (400 mL) and a 1 m aqueous solution of NaOH (320 mL, final solution pH 13-14), and crosslinked by the addition of ethylene glycol diglycidyl ether (EGDE; 50 mL) at room temperature during 2 hours of incubation. Cross-linking occurs through the reaction between amino groups of the DNA nitrous bases and epoxy groups of EDGE, as shown in Scheme 1. [8] The resulting hydrogel was transferred into MilliQ water (200 mL) and incubated for 24 hours to remove unreacted EGDE, NaOH, and non-cross-linked DNA. The hydrogel was then equilibrated against MilliQ water (300 mL) twice in 24 hours. The resulting hydrogel contained 1.5 mm DNA (DNA phosphates per hydrogel volume), as determined by UV spectroscopy measurements of the DNA hydrogel after ultrasonic homogenization for 5 minutes.In all extraction experiments, the same amount of DNA was used, that is, 2.5 g of DNA hydrogel with a DNA concentration Scheme 1. Cross-linking reaction between two DNA nucleotides and EDGE.

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Application of DNA condensation for removal of mercury ions from aqueous solutions

Cited by 21 publications

References 55 publications

DNA fragments assembled on polyamidoamine‐grafted core‐shell magnetic silica nanoparticles for removal of mercury(II) and methylmercury(I)

DNA fragments assembled on polyamidoamine‐grafted core‐shell magnetic silica nanoparticles for removal of mercury(II) and methylmercury(I)

Uptake of aromatic compounds by DNA: Toward the environmental application of DNA for cleaning water

Extraction of Noble and Rare‐Earth Metals from Aqueous Solutions by DNA Cross‐Linked Hydrogels

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