Highly fluorescent sensing of nitroaromatic explosives in aqueous media using pyrene-linked PBEMA microspheres

Turhan, Hamza; Tükenmez, Ece; Karagöz, Bünyamin; Bıçak, Niyazi

doi:10.1016/j.talanta.2017.10.061

Cited by 41 publications

(19 citation statements)

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“…Consequently, the ability to detect their presence has become an urgent public need. ,,− Current methods employed for the detection of NACs include ion mobility spectroscopy, mass spectroscopy, or canine units. ,, Although these methods offer high sensitivity, typically on the order of ppb and ppt, they suffer from at least one or more of the following drawbacks: high cost, nonportability, and complex instrumentation. ,,− Within the realm of sensor-based techniques, the use of fluorescence has gained much popularity due to its lower requirements in terms of relatively simple instrumentation, portability, low cost, and high sensitivity. ,− In these experiments, electron-rich dyes are exposed to electron-poor NACs, resulting in efficient quenching of the dyes. The luminophores that have been employed so far in fluorescence sensors include conjugated polymers, − nanodots, metal complexes, ,, luminophores that undergo aggregation-induced emission (AIEgens), − and pyrene. − Contrary to AIEgens whose fluorescence is dramatically enhanced upon aggregation in water, aggregation of pyrene induces pyrene excimer formation which shifts the strong purplish-blue fluorescence of the pyrene monomer (370–400 nm) to the strong green fluorescence of the excimer (450–600 nm) . Beside the luminophore, the nature of the substrate used in a fluorescence sensor must be carefully considered as it must ensure that the luminophores be readily accessible upon exposure to NACs.…”

Section: Introductionmentioning

confidence: 99%

Detection of Nitroaromatics by Pyrene-Labeled Starch Nanoparticles

Patel

Seet

et al. 2019

Langmuir

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Starch nanoparticles (SNPs) were hydrophobically modified by using 1-pyrenebutyric acid (PyBA) with degrees of substitution (DS) between 0.0006 and 0.11. Fluorescence quenching studies were conducted on the pyrene-labeled starch nanoparticles (Py-SNPs) in dimethyl sulfoxide (DMSO) and water with nitromethane (NM), 4-mononitrotoluene (MNT), 2,6-dinitrotoluene (DNT), and 2,4,6-trinitrotoluene (TNT) to assess the mode of quenching of the pyrene labels in the two solvents. In DMSO where pyrene, starch, and the quenchers were soluble, a decrease in fluorescence signal was the result of dynamic encounters between the excited pyrene labels and the nitrated quenchers. In water where starch could be dispersed but pyrene and the nitroaromatic compounds (NACs) were sparingly soluble, quenching took place through the binding of NACs to pyrene aggregates. Py(11)-SNPs (Py-SNPs with a DS of 0.11)-coated filter papers (Py-CFPs) were prepared as fluorescence sensors. The fluorescence emitted by Py-CFPs was quenched to 25% of its original value within 10 ± 2, 72 ± 20, and 23 ± 4 s upon exposure to vapors of MNT, DNT, and TNT, respectively. When known amounts of NACs were deposited onto Py-CFPs, their limit of detection (LOD) when the fluorescence decreased by more than 3 standard deviations (3σ) from its original value equaled 9.2 ± 0.8, 3.3 ± 0.5, and 0.20 ± 0.02 ng/mm2 for MNT, DNT, and TNT, respectively. These response times and LODs were among the best values reported to date in the scientific literature for fluorescence sensors. The selectivity of the Py-CFPs toward NACs was also investigated by comparing their response to the presence of non-nitrated aromatics, amines, and aromatic ketones. Quenching was only observed with the latter family of chemicals tested, but with much lower efficiency compared to TNT, thus reflecting some level of selectivity toward this specific NAC.

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Section: Introductionmentioning

confidence: 99%

Detection of Nitroaromatics by Pyrene-Labeled Starch Nanoparticles

Patel

Seet

et al. 2019

Langmuir

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“…6, the rhod-beads show good reversibility properties at least 5 cycles. The only drawback of the process was the intensity loss of each cycle due to the mechanical loss of the chemosensor during the regeneration process [22]. The mechanical loss means that some microbeads were lost during regeneration that was not recovered, so, unfortunately, the amount of the chemosensor was slightly decreased with each cycle.…”

Section: Regeneration Studies Of Rhod-beadsmentioning

confidence: 99%

“…In these systems, most of the recycling step relies on the ligand exchange process in which an added strong ligand binds the analyte from the chemosensor resulting in free ionophore segments. However, over-added strong ligand causes many other problems such as loss of sensitivity against targeted analyte [22]. Among the others, solid-supported chemosensors with a uniform small particle size distribution have many advantages such as simple processability, usability in any solvent system and multiple applications with a simple filtration and purification steps.…”

Section: Introductionmentioning

confidence: 99%

Selective detection of Fe (III) via fluorescence turn-on mechanism with Rhodamine tethered poly(vinyl amine) microbeads

2021

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New reusable rhodamine tethered microbeads-based chemosensor was prepared and its fluorescent behaviors toward various transition-metal ions were investigated. Firstly, almost monodisperse (~ 2-5 µm in size) poly(vinyl formamide-co-ethylene glycol dimethacrylate) microbeads (Poly(VFA-co-EGDMA)) were prepared via precipitation polymerization. After hydrolysis of the microbeads in basic medium, terephthalaldehyde was tethered onto the microbeads via imine linkages. Subsequently, rhodamine hydrazide was linked to the resulting aldehyde functional microbeads in the same manner. The structural transformation of each step and the morphology of the microbeads were evaluated by FTIR and SEM, respectively. Rhodamine-decorated microbeads exhibited selective detection abilities on Fe (III) ions with high precision through the fluorescence turn-on mechanism. The limit of detection was found to be 1.5 µM. The job's plot indicated a complexation ability as 1:1 stoichiometry between the chemosensor and Fe 3+ ion. The Benesi-Hildebrand plot revealed a binding constant (Ka) of 7 × 10 4 mol/L and the average fluorescence lifetime was measured as 48.9 ± 3.0 ns. From the material point of view, either the small particle size with a high surface area or crosslinked nature provided excellent sensing ability and stability of the microbeads in a heterogeneous medium. Besides, due to its densely crosslinked structure, rod beads can be easily reused after the ligand exchange process by simple filtration, which is a very important advantage for chemosensor recycling. These features offer a potential application as a chemosensor of Fe 3+ ion in aqueous solution.

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“…30 Excimer emission of PAH-based uorophores is a convenient tool for the analysis of water or food samples, 35 for DNA studies, 36 as well as for the "turn-off' detection of various analytes/pollutants, 37 including (nitro)explosives. 38,39 In the last case the uorescence quenching of PAH uorophores via either charge or energy transfer is easily registered by a uorimeter. Although the intensity of the charge/energy transfer, as well as the absorption and emission maxima in PAH uorophores are easily tunable, their excimer stabilization is still subjected to extensive studies.…”

Section: Introductionmentioning

confidence: 99%