Masking agent-controlled discriminative Hg2+ and Cu2+ sensing by quinonediimine dye formation of aniline-functionalized silica nanoparticles

Kim, Da Bin; Lee, Kyung Hyun; Park, Ka Young; Ahn, Sangdoo; Chang, Suk‐Kyu

doi:10.1016/j.snb.2017.12.100

Cited by 8 publications

(7 citation statements)

References 36 publications

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“…The fluorescence was severely quenched by Hg 2+ , and showed nonmeasurable quenching by other cations at identical concentrations except for Cu 2+ and Pb 2+ . For measurement of real water samples, the interference of these species may be eliminated by strategies such as adding citrate , or ethylenediaminetetraacetate , for masking Cu 2+ and adding G-rich DNA for masking Pb 2+ . , Further improvement in the selectivity of Bio-QD probe will be needed in future studies. Furthermore, the Bio-QD-based fluorometry was reperformed with different cuvette and at different temperature from the previous one, but nearly the same fluorescence intensity–Hg 2+ concentration regression curve was obtained (Figure S4), indicating a good reproducibility and robustness of this method.…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Biogenic Quantum Dots for Sensitive, Label-Free Detection of Mercury Ions

Tian

Yuan

Wang

et al. 2019

ACS Appl. Bio Mater.

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Nanoparticle-based fluorescent probes, typically fabricated by a chemical synthesis route, have been widely used for monitoring trace heavy metals in environments. However, the high-cost and complicated, aggressive fabrication processes restrict their widespread application. In this work, we report the first use of biogenic quantum dots (Bio-QDs) as a highly sensitive, low-cost fluorescent probe for label-free detection of mercury ions (Hg2+), with comparable performance to conventional chemically synthesized counterparts. Fluorescent Bio-QDs with uniform sizes (1.6 ± 0.3 nm) and unique core–shell structure (CdS x Se1–x core and protein- and phosphate-rich capping) were assembled by Escherichia coli cells. The Bio-QDs were extracted and directly used as a Hg2+ probe, which exhibited sensitive, linear fluorescent response to Hg2+ concentration in the range of 1.5–100 nM. Interestingly, it even enable a naked-eye detection of Hg2+ in a higher concentration range of 0.1–10 μM by simply raising the Bio-QD load. The underlying detection mechanisms, involving substitution of the Cd atoms with Hg from water, were revealed by Raman spectra, X-ray absorption fine structure, and density functional theory calculations. Our work implies a high potential of green-synthesized Bio-QDs for environmental monitoring applications, which may not only broaden the application ranges of Bio-QDs, but also advance the development of environmental analytical techniques toward higher sustainability.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Biogenic Quantum Dots for Sensitive, Label-Free Detection of Mercury Ions

Tian

Yuan

Wang

et al. 2019

ACS Appl. Bio Mater.

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“…The results of the above experiment are shown in Figure a. To minimize the interference of Cd 2+ and Pb 2+ ions and other metal ions with Hg 2+ ions, citrate buffer was used as a masking agent . To perform the experiment (interference effect in the presence of a masking agent), a reaction mixture of the FeMNP-AlOx probe (2 μL, 0.20 mg), plus various metal ions (2 μL, 100 ng L –1 ) were added to citrate buffer (2 μL, 0.05 M, and pH 5.0) in the first row of a 96-microwell plate and incubated for 5 min.…”

Section: Resultsmentioning

confidence: 99%

“…To minimize the interference of Cd 2+ and Pb 2+ ions and other metal ions with Hg 2+ ions, citrate buffer was used as a masking agent. 41 To perform the experiment (interference effect in the presence of a masking agent), a reaction mixture of the FeMNP-AlOx probe (2 μL, 0.20 mg), plus various metal ions (2 μL, 100 ng L −1 ) were added to citrate buffer (2 μL, 0.05 M, and pH 5.0) in the first row of a 96-microwell plate and incubated for 5 min. Another mixture of PB (194 μL, 10 mM, and pH 7.4), methanol (4 μL, 0.02 mM) and HRP (2 μL, 0.2 IU μL −1 ) was added to the second row of the same 96microwell plate.…”

Section: Acs Earth and Space Chemistrymentioning

confidence: 99%

A Dual-Readout Magnetic Nanoparticle-Based Enzyme Assay for the Sensitive Detection of Hg(II) Ions in Drinking Water

Swain

Bhand

2018

ACS Earth Space Chem.

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Development of miniaturized sensitive techniques for the analysis of toxic mercury ions (Hg 2+ ) in water is of immense interest due to public health concerns. A miniaturized colorimetric FeMNPs-AlOx probe was developed for rapid and selective detection of Hg 2+ ions in drinking water with a significantly low limit of detection 0.1 ng L −1 . A linear working range of detection of 0.5−100 ng L −1 for Hg 2+ ions was achieved for 200 μL assay volumes with 10 min analysis times. The sensing system comprises alcohol oxidase enzymes (AlOx) coupled to iron oxide magnetic nanoparticles (FeMNPs) (average particle size 40 nm) via silane cross-linkers. The activity of the sensing probe was quantified using methanol, horseradish peroxidase (HRP) enzyme, and O-phenylenediamine (OPD) as the colorimetric substrate. The developed sensing probe was tested for analysis in drinking water samples with recoveries of 93− 100%. Selectivity toward Hg 2+ ions was achieved using citrate buffer as a masking agent. Analysis of Hg 2+ ions was also carried out in the presence of Certipur certified reference material (CRM) for a multielement solution (As, Be, Cd, Cr(VI), Hg, Ni, Pb, Se, Tl). The developed FeMNPs-AlOx sensing probe exhibited good storage stability (with 75% retention of original response) over one month when stored at 4 °C. The developed probe also provided clear visual detection of Hg 2+ ions in drinking water samples via colorimetric sensing.

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“…Meanwhile, naphthol group is a good uorophore that can interact with various metal ions [29][30][31]. Thus, the sensor containing both benzothiazole and naphthol moieties might be a suitable platform that can detect Cu 2+ with turn-on system [32][33][34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

A Benzothiazole-Based Fluorescence Turn-on Sensor for Copper(II)

2021

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A new benzothiazole-based chemosensor BTN (1-((Z)-(((E)-3-methylbenzo[d]thiazol-2(3H)ylidene)hydrazono)methyl)naphthalen-2-ol) was synthesized for the detection of Cu 2+ . BTN could detect Cu 2+ with "off-on" uorescent response from colorless to yellow irrespective of presence of other cations.Limit of detection for Cu 2+ was determined to be 3.3 µM. Binding ratio of BTN and Cu 2+ turned out to be a 1:1 with the analysis of Job plot and ESI-MS. Sensing feature of Cu 2+ by BTN was explained with theoretical calculations, which might be owing to internal charge transfer and chelation-enhanced uorescence processes.

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Masking agent-controlled discriminative Hg2+ and Cu2+ sensing by quinonediimine dye formation of aniline-functionalized silica nanoparticles

Cited by 8 publications

References 36 publications

Biogenic Quantum Dots for Sensitive, Label-Free Detection of Mercury Ions

Biogenic Quantum Dots for Sensitive, Label-Free Detection of Mercury Ions

A Dual-Readout Magnetic Nanoparticle-Based Enzyme Assay for the Sensitive Detection of Hg(II) Ions in Drinking Water

A Benzothiazole-Based Fluorescence Turn-on Sensor for Copper(II)

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