scholarly journals An Acridine-Based Fluorescent Sensor for Monitoring ClO− in Water Samples and Zebrafish

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4764
Author(s):  
Su Chan Lee ◽  
Soyoung Park ◽  
Haeri So ◽  
Gyudong Lee ◽  
Ki-Tae Kim ◽  
...  
Keyword(s):  
Detection Limit ◽  
Fluorescence Quenching ◽  
Water Samples ◽  
Fluorescent Sensor ◽  
Aldehyde Group ◽  
Fluorescent Chemosensor ◽  
Synthetic Route

A novel acridine-based fluorescent chemosensor, BK ((E)-2-((acridine-9-ylimino)methyl)-N-benzhydrylhydrazine-1-carbothioamide), for monitoring ClO− was prepared. The sensor BK was synthesized by introducing a new synthetic route of making aldehyde group using formic hydrazide. Probe BK displayed notable fluorescence quenching in the presence of ClO− and showed a great selectivity over other guest analytes. The detection limit was calculated to be 7.65 μM. Additionally, BK was satisfactorily applied for sensing ClO− in water samples and zebrafish.

A highly selective fluorescent chemosensor based on a quinoline derivative for zinc ions in pure water

RSC Advances ◽  
2015 ◽  
Vol 5 (75) ◽  
pp. 60796-60803 ◽  
Author(s):  
Ye Won Choi ◽  
Jae Jun Lee ◽  
Cheal Kim
Keyword(s):  
Detection Limit ◽  
Water Samples ◽  
Fluorescent Sensor ◽  
Pure Water ◽  
Quinoline Derivative ◽  
Water Soluble ◽  
Fluorescent Chemosensor ◽  
Zinc Ions ◽  
Low Detection Limit

A water-soluble fluorescent sensor with a low detection limit could be used to detect and quantify Zn2+in water samples.

Label-Free Aptamer Fluorescence Determination of Trace Pb2+ Using AuPd Nanoalloy Probe as Catalyst

2013 ◽  
Vol 631-632 ◽  
pp. 18-21 ◽  
Author(s):  
Zhi Liang Jiang ◽  
Mei Ling Tang ◽  
Qing Ye Liu ◽  
Ai Hui Liang
Keyword(s):  
Detection Limit ◽  
Fluorescence Quenching ◽  
Fluorescence Intensity ◽  
Water Samples ◽  
Catalytic Effect ◽  
Rhodamine 6G ◽  
Label Free ◽  
Double Stranded Dna ◽  
Fluorescence Determination

In the condition of 1.24 mmol/L EDTANa2, 16.7 mmol/L NaCl and 0.17 mmol/L Tris, the substrate chain of double-stranded DNA (dsDNA) could be cracked by Pb2+ to release single-stranded DNA (ssDNA) that adsorb onto AuPd nanoparticle (AuPdNP) and form stable AuPdNP-ssDNA, but the dsDNA can not protect AuPdNP that were aggregated to big AuPdNP aggregations (AuPdNPA) under the action of NaCl. The AuPdNP-ssDNA and AuPdNPA could be separated by centrifugation. With the concentration of Pb2+ increased, the released ssDNA increased, the AuPdNP-ssDNA in centrifugation solution increased and the catalytic effect enhanced on the fluorescence quenching reaction of Rhodamine 6G (Rh6G) and NaH2PO2, which led the fluorescence intensity at 552nm to decrease. The decreased fluorescence intensity (ΔF552nm) was linear to the concentration of Pb2+ in the range of 0.33-8.00 nmol/L, a detection limit of 0.21 nmol/L. The proposed method was applied to detect Pb2+ in water samples, with satisfactory results.

scholarly journals Fluorescence quenching detection of UO2 2+ in aqueous solution based on an organic molecule probe of 6-chloro-2H-1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide

2021 ◽  
Vol 40 (1) ◽  
pp. 136-143
Author(s):  
Amira A. Elabd ◽  
Olivea A. Elhefnawy
Keyword(s):  
Detection Limit ◽  
Fluorescence Quenching ◽  
Fluorescence Intensity ◽  
Organic Molecule ◽  
Dynamic Range ◽  
Fluorescent Sensor ◽  
Transfer Processes ◽  
Electron Transfer Processes ◽  
Sulfonamide Group ◽  
Positively Charged

Abstract A new organic molecule probe has been introduced as a “turn-off” fluorescent sensor to detect trace quantities of UO2 2+ in the presence of several transition metals with promising results. The procedure is based on quenching the fluorescence intensity of 6-chloro-2H-1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide (L) in the presence of various UO2 2+ concentrations in methanol. The UO2 2+ and L species interact through electrostatic interaction between negatively charged nitrogen atom of the sulfonamide group of L and positively charged UO2 2+, thus facilitating the non-radiative recombination of UO2 2+ and L through the charge transfer or electron transfer processes and leading to the fluorescence quenching of L. The mechanism of quenching was addressed and proved to be static quenching. The impressive quenching of the fluorescence intensity of L by different concentrations of UO2 2+ has been successfully used as a new sensor to measure UO2 2+ in methanol at λ ex = 340 nm, λ em = 380 nm with a linear dynamic range of 0.08–5.0 µM and detection limit and quantification limit of 0.0276 and 0.0837 µM, respectively. The L sensor shows interesting advantages compared to other developed sensors with adequate performance, such as broader linear range and lower detection limit, selectivity, and simplicity, which illustrate its useful practical use.

Nitrogen-doped carbon dots from Hutai-8 grape skin and their application in Hg2+ detection

2020 ◽  
Vol 16 ◽  
Author(s):  
Pan Zhang ◽  
Shun-Sheng Zhao ◽  
JiaJia Wang ◽  
Xiang Rong Liu
Keyword(s):  
Heavy Metal ◽  
Carbon Source ◽  
Fluorescence Quenching ◽  
Hydrothermal Method ◽  
Water Samples ◽  
Carbon Dots ◽  
Mercury Ions ◽  
Grape Skin ◽  
Fluorescent Carbon Dots ◽  
Fluorescent Carbon

Background: In recent years, environmental pollution and heavy metal pollution caused by rapid urbanization and industrialization have become increasingly serious. Among them, mercury (II) ion (Hg2+) is one of the highly toxic heavy metal ions, and its pollution comes from various natural resources and human activities. Therefore, people attach great importance to the development of analytical methods for effective analysis and sensitive detection of Hg2+ . Objective: Using grape skin as a green and environmental friendly carbon source, to synthesize fluorescent carbon dots, and try to apply them to the detect the concentration of Hg2+ in water. Method: Using "Hutai No. 8" grape skin as carbon source, fluorescent carbon dots were synthesized by one-step hydrothermal method. Structure and fluorescent properties of the carbon dots were tested using TEM, XPS, XRD and other characterization instruments, and their utilization on detection of mercury ions in the actual water samples was explored. Results: The CDs had a particle size of about 4.8 nm and a spherical shape. There are N-H, C-N, C=O and other functional groups on the surface. It was found that Hg2+ has obvious fluorescence quenching effect on CDs, and thus CDs fluorescence quenching method to detect the concentration Hg2+ was established, and the detection limit is 3.7 μM, which could be applied to test the concentration of Hg2+ in water samples. Conclusion: Using grape skin as carbon source, fluorescent carbon dots were successfully synthesized by hydrothermal method. Carbon dots were used to detect mercury ions in water, and a method for detecting mercury ions in actual water samples was established.

scholarly journals A Novel Thiosemicarbazide-Based Fluorescent Chemosensor for Hypochlorite in Near-Perfect Aqueous Solution and Zebrafish

Chemosensors ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 65
Author(s):  
Minji Lee ◽  
Donghwan Choe ◽  
Soyoung Park ◽  
Hyeongjin Kim ◽  
Soomin Jeong ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Reactive Oxygen Species ◽  
Aqueous Solution ◽  
Fluorescence Quenching ◽  
Limit Of Detection ◽  
Fluorescent Sensor ◽  
Ionization Mass ◽  
Oxygen Species ◽  
Marked Selectivity ◽  
Uv Visible

A novel thiosemicarbazide-based fluorescent sensor (AFC) was developed. It was successfully applied to detect hypochlorite (ClO−) with fluorescence quenching in bis-tris buffer. The limit of detection of AFC for ClO− was analyzed to be 58.7 μM. Importantly, AFC could be employed as an efficient and practical fluorescent sensor for ClO− in water sample and zebrafish. Moreover, AFC showed a marked selectivity to ClO− over varied competitive analytes with reactive oxygen species. The detection process of AFC to ClO− was illustrated by UV–visible and fluorescent spectroscopy and electrospray ionization–mass spectrometry (ESI–MS).

A green synthetic route for the surface-passivation of carbon dots as an effective multifunctional fluorescent sensor for the recognition and detection of toxic metal ions from aqueous solution

2019 ◽  
Vol 11 (4) ◽  
pp. 490-506 ◽  
Author(s):  
K. Radhakrishnan ◽  
P. Panneerselvam ◽  
M. Marieeswaran
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Carbon Dots ◽  
Surface Passivation ◽  
Fluorescent Sensor ◽  
Toxic Metal ◽  
Carbon Quantum Dots ◽  
Synthetic Route ◽  
One Pot ◽  
Hydrothermal Methods

In this work, a green synthetic route was used to create a number of surface passivated fluorescent carbon quantum dots, which are explored as promising sensing probes, via facile one-pot hydrothermal methods.

A fluorogenic and chromogenic dual sensor for the detection of cyanide and copper(ii) in water samples and living cells

2016 ◽  
Vol 8 (38) ◽  
pp. 6909-6915 ◽  
Author(s):  
T. M. Ebaston ◽  
G. Balamurugan ◽  
S. Velmathi
Keyword(s):  
Charge Transfer ◽  
Detection Limit ◽  
Fluorescent Sensor ◽  
Aqueous Media ◽  
Living Cells ◽  
Dual Sensor ◽  
Molecular Charge ◽  
Intra Molecular Charge Transfer ◽  
Good Detection Limit ◽  
Good Detection

Here we describe a simple fluorescent sensor based on intra molecular charge transfer to detect cyanide in aqueous media selectively with a very good detection limit and cascade recognition of aq. copper(ii) ions.

A novel 3D Zn-coordination polymer based on a multiresponsive fluorescent sensor demonstrating outstanding sensitivities and selectivities for the efficient detection of multiple analytes

2021 ◽  
Author(s):  
Yu Liu ◽  
Yan Wang ◽  
Xiao-Sa Zhang ◽  
Yu-Shu Sheng ◽  
Wen-Ze Li ◽  
...  
Keyword(s):  
Detection Limit ◽  
Coordination Polymer ◽  
Fluorescent Sensor ◽  
Lower Detection Limit ◽  
Ph Values ◽  
Efficient Detection ◽  
Wide Range ◽  
Lower Detection ◽  
Multiple Analytes

A Zn-CP exhibits remarkable fluorescence behaviours and stability in a wide range of pH values. It can become an outstanding candidate in the selective sensing of Fe3+, Mg2+, Cr2O72−, MnO4−, NB and NM at a lower detection limit.

Pyrene pyridine-conjugate as Ag selective fluorescent chemosensor

RSC Advances ◽  
2014 ◽  
Vol 4 (67) ◽  
pp. 35284-35289 ◽  
Author(s):  
K. Velmurugan ◽  
A. Raman ◽  
S. Easwaramoorthi ◽  
R. Nandhakumar
Keyword(s):  
Fluorescent Sensor ◽  
Fluorescent Chemosensor

A new pyrene pyridine conjugate (PPC) has been developed as a selective fluorescent sensor for Ag+ion.

A novel histidine-functionalized 1,8-naphthalimide-based fluorescent chemosensor for the selective and sensitive detection of Hg2+ in water

2017 ◽  
Vol 41 (9) ◽  
pp. 3303-3307 ◽  
Author(s):  
You-Ming Zhang ◽  
Kai-Peng Zhong ◽  
Jun-Xia Su ◽  
Xiao-Peng Chen ◽  
Hong Yao ◽  
...  
Keyword(s):  
Binding Site ◽  
Fluorescent Sensor ◽  
Water Soluble ◽  
Sensitive Detection ◽  
Fluorescent Chemosensor ◽  
Hydrophilic Group

A novel water soluble fluorescent sensor was synthesized by employing the carboxyl and imidazolyl moiety as the hydrophilic group site and Hg2+ binding site, whereas a naphthalimide moiety was used as the signal group.

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