Highly Hg2+-sensitive and selective fluorescent sensors in aqueous solution and sensors-encapsulated polymeric membrane

RSC Advances ◽  
2016 ◽  
Vol 6 (13) ◽  
pp. 10401-10411 ◽  
Author(s):  
Sasiwimon Kraithong ◽  
Pattareeya Damrongsak ◽  
Kullatat Suwatpipat ◽  
Jitnapa Sirirak ◽  
Pattanawit Swanglap ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Detection Limits ◽  
High Sensitivity ◽  
Fluorescent Sensors ◽  
Polymeric Membranes ◽  
Polymeric Membrane ◽  
Sensitivity And Selectivity

The sensors in solutions and sensors encapsulated polymeric membranes exhibited high sensitivity and selectivity for Hg2+ detection, with detection limits of 0.2–49 ppb.

scholarly journals Highly sensitive detection of nitrobenzene by a series of fluorescent 2D zinc(ii) metal–organic frameworks with a flexible triangular ligand

RSC Advances ◽  
2021 ◽  
Vol 11 (39) ◽  
pp. 23975-23984
Author(s):  
Xue Yang ◽  
Yixia Ren ◽  
Hongmei Chai ◽  
Xiufang Hou ◽  
Zhixiang Wang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Metal Organic Frameworks ◽  
High Sensitivity ◽  
Fluorescent Sensors ◽  
Sensitive Detection ◽  
Donor Ligands ◽  
Highly Sensitive ◽  
Metal Organic ◽  
Highly Sensitive Detection

Four fluorescent 2D Zn-MOFs based on a flexible triangular ligand and linear N-donor ligands are hydrothermally prepared and used to detect nitrobenzene in aqueous solution with high sensitivity, demonstrating their potential as fluorescent sensors.

scholarly journals A Review on 2,6-Diformyl-4-methylphenol Derived Schiff Bases as Fluorescent Sensors

2020 ◽  
Vol 32 (8) ◽  
pp. 1837-1848
Author(s):  
Mrinal sarkar
Keyword(s):  
Schiff Base ◽  
Metal Ions ◽  
High Sensitivity ◽  
Electronic Configuration ◽  
Fluorescent Sensors ◽  
Intermolecular Hydrogen Bonding ◽  
Fluorescent Chemosensors ◽  
Emission Mechanism ◽  
Sensitivity And Selectivity ◽  
Transfer Mechanisms

2,6-Diformyl-4-methylphenol fluorophore derived Schiff base sensors detect metal ions such as Zn2+, Al3+, Hg2+, Cd2+, Sn2+ and Cu2+ with high sensitivity and selectivity through changes in fluorescence intensity based on CHEF, ICT, FRET, ESIPT, C=N isomerization and PET mechanism. Several anions viz. HPO4 2–, H2PO4 –, PO4 3–, AsO3 3–, H2AsO4 –, AsO2 –, PPi (pyrophosphate), I–, F– and N3 – were also detected through intermolecular hydrogen bonding (between sensor and anion) based on TICT, PET, CHEF, ESIPT and aggregation induced emission mechanism. Selectivity and sensitivity for these metal ions and anions were achieved by introducing various amines to core fluorophore 2,6-diformyl-4-methylphenol. Majority of these fluorescent sensors were Zn2+ ion selective. Due to the filled d10 electronic configuration of Zn2+ ion usually does not show deactivation of excited state via any electron or energy transfer mechanisms. Both solvent dependent and independent ten multi-ion selective sensors are found. This review will consolidate on 2,6-diformyl-4-methylphenol derived Schiff base fluorescent chemosensors.

Triphenylamine-based fluorescent sensors for CO2 response and detection of F− with high sensitivity and selectivity

2017 ◽  
Vol 140 ◽  
pp. 131-140 ◽  
Author(s):  
H.C. Ma ◽  
Z.M. Yang ◽  
H.Y. Cao ◽  
L. Lei ◽  
Z.Q. Lei
Keyword(s):  
High Sensitivity ◽  
Fluorescent Sensors ◽  
Co2 Response ◽  
Sensitivity And Selectivity

scholarly journals Potentiometric Signal Transduction for Selective Determination of 1-(3-Chlorophenyl)piperazine “Legal Ecstasy” Through Biomimetic Interaction Mechanism

Chemosensors ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 46
Author(s):  
Eman El-Naby
Keyword(s):  
Dynamic Range ◽  
Limit Of Detection ◽  
Interaction Mechanism ◽  
High Sensitivity ◽  
Fast Response ◽  
Polymeric Membrane ◽  
Selective Determination ◽  
Sensitivity And Selectivity ◽  
Pharmacologically Active

1-(3-chlorophenyl)piperazine (mCPP) is a wide spread new psychoactive substance produces stimulant and hallucinogenic effects similar to those sought from ecstasy. Hence, in the recent years, mCPP has been introduced by the organized crime through the darknet as a part of the illicit ecstasy market with a variable complex profile of pharmacologically active substances that pose problematic risk patterns among people who take these seized products. Accordingly, the design of selective sensors for the determination of mCPP is a very important demand. In this respect, a supramolecular architecture; [Na(15-crown-5)][BPh4] from the assembly of 15-crown-5 and sodium tetraphenylboron has been utilized as an ionophore, for the first time in the selective recognition of mCPP in conjunction with potassium tetrakis(p-chlorophenyl)borate and dioctylphthalate through polymeric membrane ion sensors. The ionophore exhibited a strong binding affinity that resulted in a high sensitivity with a slope closed to the ideal Nernstian value; 58.9 ± 0.43 mV/decade, a larger dynamic range from 10−6 to 10−2 M, a lower limit of detection down to 5.0 × 10−7 M and a fast response time of 5 s. Very important also is it was afforded excellent selectivity towards mCPP over psychoactive substances of major concern, providing a potentially useful system for the determination of mCPP in the illicit market. On comparison with the natural β-cyclodextrin as an ionophore, it exhibited more sensitivity and selectivity estimated to be the superior.

Cacodylate sensor and its application for the determination of amino acid levels in biological samples

2020 ◽  
Author(s):  
Hisham S M Abd-Rabboh ◽  
Ayman H Kamel ◽  
Fuziah H A Alshehri
Keyword(s):  
Biological Samples ◽  
Electrochemical Sensors ◽  
Response Times ◽  
Reference Electrode ◽  
High Sensitivity ◽  
Life Time ◽  
Polymeric Membrane ◽  
Time Signal ◽  
Sensitivity And Selectivity ◽  
Environmental And Biological Samples

Abstract Background The importance of recognizing and quantifying chemical anions/cations found in various types of samples, including environmental and biological samples, is extensively studied. Recent findings suggest the possibility of health risk caused by organic dimethylarsininc acid (DMAs) compound itself, not its arsenic inorganic metabolite. Objective This article aims to fabricate polymeric-membrane electrochemical sensors with high sensitivity and selectivity for dimethylarsinate (cacodylic acid sodium salt, DMAs) based on silver diethyldithiocarbamate (AgDDTC) and CuIIphthalocyanine (CuPC) as novel neutral carriers and their applications. Methods DMAs calibration relations and titrations were carried out using a potentiometric workstation equipped with a double-junction reference electrode, in conjunction with the fabricated working electrodes. Results Sensors revealed fast and stable anionic response with near-Nernstian slopes (-38.6 ± 0.9 and -31.5 ± 0.6 mV/decade), within concentration ranges (1.7x10−5 - 1.0x10−2 and 3.0x10−5 - 1.0x10−2 M) and detection limits (1.0x10−5 and 1.6x10−5 M) for AgDDTC- and CuPC-based sensors, respectively. Sensors are characterized with their extended life-time, signal stability, high precision and short response times. Selectivity for cacodylate anion over most common anions is tested for proposed electrodes. Sensors were satisfactorily applied for DMAs quantification in biological matrices with recoveries ranging between 96.2 and 99.0%. Membrane sensors were interfaced with a flow-through system for continuous monitoring of DMAs. The sensors were tested for the assay of different amino acids based on their reaction with cacodylate, where reaction end-points were monitored with the proposed electrodes using direct potentiometric determination and flow injection analysis (FIA).

Lateral flow nucleic acid biosensor for Cu2+ detection in aqueous solution with high sensitivity and selectivity

2010 ◽  
Vol 46 (47) ◽  
pp. 9043 ◽  
Author(s):  
Zhiyuan Fang ◽  
Jing Huang ◽  
Puchang Lie ◽  
Zhuo Xiao ◽  
Chuanyan Ouyang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Nucleic Acid ◽  
High Sensitivity ◽  
Lateral Flow ◽  
Sensitivity And Selectivity
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