A Highly Emissive Zn(II)-pyridyl-benzimidazolyl-phenolato based Chemosensor: Detection of H2PO4‒ via “Use” and “Throw” Device Fabrication

2021 ◽  
Author(s):  
Sunanda Dey ◽  
Sukanya Paul ◽  
Kingshuk Debsharma ◽  
Chittaranjan Sinha
Keyword(s):  
Limit Of Detection ◽  
Device Fabrication ◽  
Hepes Buffer ◽  
Turn On

2-Ethoxy-6-[1-(phenyl-pyridin-2-yl-methyl)-1H-benzoimidazol-2-yl]-phenol (HL) selectively serves as sensitive ‘turn on’ Zn2+ sensor in 9:1 (v/v) DMSO/H2O (HEPES Buffer, pH=7.4) medium in presence of sixteen other cations at the limit of detection (LOD)...

Chromogenic ‘naked eye’ and fluorogenic ‘turn on’ sensor for mercury metal ion using thiophene-based Schiff base

RSC Advances ◽  
2015 ◽  
Vol 5 (81) ◽  
pp. 65731-65738 ◽  
Author(s):  
Divya Singhal ◽  
Neha Gupta ◽  
Ashok Kumar Singh
Keyword(s):  
Schiff Base ◽  
Binding Affinity ◽  
Metal Ion ◽  
Limit Of Detection ◽  
Electrochemical Behaviour ◽  
Naked Eye ◽  
Turn On

2-((3-Methylthiophen-2-yl)methyleneamino)benzenethiol (Probe 1) is selective for Hg2+. The binding affinity of Hg2+ with Probe 1 was confirmed by DFT and electrochemical behaviour. The limit of detection was 20 μM with 2 : 1 stoichiometry of 1 + Hg2+ complex.

A benzothiazole-based fluorescence turn-on sensor for copper(II)

2021 ◽  
Author(s):  
Gyeongjin Kim ◽  
Donghwan Choi ◽  
Cheal Kim
Keyword(s):  
Charge Transfer ◽  
Limit Of Detection ◽  
Theoretical Calculations ◽  
Enhanced Fluorescence ◽  
Turn On ◽  
Fluorescent Response ◽  
Chelation Enhanced Fluorescence ◽  
Fluorescence Turn On ◽  
Internal Charge Transfer ◽  
Internal Charge

Abstract 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 Cu2+. BTN could detect Cu2+ with “off-on” fluorescent response from colorless to yellow irrespective of presence of other cations. Limit of detection for Cu2+ was determined to be 3.3 µM. Binding ratio of BTN and Cu2+ turned out to be a 1:1 with the analysis of Job plot and ESI-MS. Sensing feature of Cu2+ by BTN was explained with theoretical calculations, which might be owing to internal charge transfer and chelation-enhanced fluorescence processes.

A Highly Sensitive and Label-Free Microbead-Based ‘Turn-On’ Colorimetric Sensor for the Detection of Mercury(II) in Urine Using a Peroxidase-Like Split G-Quadruplex–Hemin DNAzyme

2018 ◽  
Vol 71 (12) ◽  
pp. 945
Author(s):  
Xin Fu ◽  
He Zhang ◽  
Jie Zhang ◽  
Shi-Tong Wen ◽  
Xing-Cheng Deng
Keyword(s):  
Standard Deviation ◽  
Base Pair ◽  
Limit Of Detection ◽  
Label Free ◽  
Turn On ◽  
Highly Sensitive ◽  
Relative Standard ◽  
G Quadruplex ◽  
Catalytically Active ◽  
Partial Cdna

A highly sensitive and label-free microbead-based ‘turn-on’ assay was developed for the detection of Hg2+ in urine based on the Hg2+-mediated formation of intermolecular split G-quadruplex–hemin DNAzymes. In the presence of Hg2+, T–T mismatches between the two partial cDNA strands were stabilized by a T–Hg2+–T base pair, and can cause the G-rich sequences of the two oligonucleotides to associate to form a split G-quadruplex which is able to bind hemin to form the catalytically active G-quadruplex–hemin DNAzyme. This microbead-based ‘turn-on’ process allows the detection of Hg2+ in urine samples at concentrations as low as 0.5 pM. The relative standard deviation and recovery are 1.2–3.9 and 98.7–103.2%, respectively. The remarkable sensitivity for Hg2+ is mainly attributed to the enhanced mass transport ability that is inherent in homogeneous microbead-based assays. Compared with previous developments of intermolecular split G-quardruplex–hemin DNAzymes for the homogeneous detection of Hg2+ (the limit of detection was 19nM), a signal enhancement of ~1000 times is obtained when such an assay is performed on the surface of microbeads.

Deciphering the positional impact of chlorine in a new series of berberine analogues towards the superb-selective “turn-on” hydrophobic signaling of bovine serum albumin at physiological pH

2020 ◽  
Vol 44 (5) ◽  
pp. 1761-1771 ◽  
Author(s):  
Gopal Chandra Jana ◽  
Sk Nayim ◽  
Nandan Kumar Sahoo ◽  
Somnath Das ◽  
Mt Nasima Aktara ◽  
...  
Keyword(s):  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Bovine Serum ◽  
Limit Of Detection ◽  
Selective Detection ◽  
Turn On

We report a new 9-O-benzyl substituted berberine analogue for the selective detection of BSA with a limit of detection value of 3.30 nM.

para-Hydroxy Thiophenol-Coated CdSe/ZnS Quantum Dots as a Turn-On Fluorescent Probe for H2O2 Detection in Aqueous Media

2018 ◽  
Vol 71 (12) ◽  
pp. 971 ◽  
Author(s):  
Xiaomei Wang ◽  
Yong Luo ◽  
Hu Xu ◽  
Dan Li ◽  
Yuhong Wang
Keyword(s):  
Quantum Dots ◽  
Limit Of Detection ◽  
Aqueous Media ◽  
Hydroxy Ketone ◽  
Hole Transfer ◽  
Turn On ◽  
H2o2 Detection ◽  
Potential Alternative ◽  
Fluorescence Turn On ◽  
Optimized Conditions

Since hydrogen peroxide plays an important role in various fields, a facile, simple, highly selective, and stable analytic method for H2O2 is desirable. Semiconductor quantum dots (QDs) have acted as a potential alternative for organic fluorophores in fluorescence analytical fields due to their superior optical properties. Herein, we report hydrophilic p-hydroxy thiophenol (p-HTP) coated CdSe/ZnS QDs (denoted as p-HTP-QDs) acting as a selective fluorescence ‘turn-on’ probe for H2O2 in aqueous media. The obtained p-HTP-QD probe exhibits weak fluorescence, which stems from hole transfer from the QDs to p-HTP. The presence of H2O2 induces an oxidative structural transformation of p-HTP in p-HTP-QDs from a phenol structure to an α-hydroxy ketone derivative, which extremely reduces the driving force for hole transfer. Thus, the QDs photoluminescence (PL) was re-switched on. Under optimized conditions, an excellent linear relationship between fluorescence response and H2O2 concentration could be produced with a linear range from 0.309 to 4.900mM. The limit of detection of this probe was found to be 0.135mM. Moreover, the present probe exhibited a high selectivity of H2O2 over other reactive oxygen species/reactive nitrogen species (ROS/RNS) and was successfully used in the detection of H2O2 in real water samples.

Design of a coumarinyl-picolinoyl hydrazide Schiff base for the fluorescence turn-on–off sequential sensing of Al3+ and nitroaromatics, and electronic device fabrication

2019 ◽  
Vol 43 (37) ◽  
pp. 14979-14990 ◽  
Author(s):  
Rakesh Purkait ◽  
Arka Dey ◽  
Sunanda Dey ◽  
Partha Pratim Ray ◽  
Chittaranjan Sinha
Keyword(s):  
Electrical Conductivity ◽  
Schiff Base ◽  
Organic Molecule ◽  
Electronic Device ◽  
Device Fabrication ◽  
Fluorescence Sensing ◽  
Small Organic Molecule ◽  
Turn On ◽  
Fluorescence Turn On ◽  
Electronic Device Fabrication

Designing a small organic molecule for fluorescence sensing and electrical conductivity is a challenging task.

Carbazole-driven ratiometric fluorescence turn on for dual ion recognition of Zn2+ and Hg2+ by thiophene-pyridyl conjugate in HEPES buffer medium: spectroscopy, computational, microscopy and cellular studies

2016 ◽  
Vol 29 (3) ◽  
pp. 215-228 ◽  
Author(s):  
Ajit Kumar Mahapatra ◽  
Rajkishor Maji ◽  
Kalipada Maiti ◽  
Sanchita Mondal ◽  
Syed Samim Ali ◽  
...  
Keyword(s):  
Ratiometric Fluorescence ◽  
Ion Recognition ◽  
Hepes Buffer ◽  
Turn On ◽  
Buffer Medium ◽  
Fluorescence Turn On

A supramolecular nanobiological hybrid as a PET sensor for bacterial DNA isolated from Streptomyces sanglieri

The Analyst ◽  
2014 ◽  
Vol 139 (24) ◽  
pp. 6502-6510 ◽  
Author(s):  
Sudesna Chakravarty ◽  
Dilip Saikia ◽  
Priyanka Sharma ◽  
Nirab Chandra Adhikary ◽  
Debajit Thakur ◽  
...  
Keyword(s):  
Limit Of Detection ◽  
Sensitive Detection ◽  
Bacterial Dna ◽  
Turn On ◽  
Highly Sensitive ◽  
Highly Sensitive Detection

A ‘turn on–off–on’ sensor for highly sensitive detection of ds DNA with an excellent ‘limit of detection’ is reported.

Fluorescence sensing and intracellular imaging of Pd2+ ions by a novel coumarinyl-rhodamine Schiff base

2019 ◽  
Vol 43 (9) ◽  
pp. 3899-3906 ◽  
Author(s):  
Arup Kumar Adak ◽  
Rakesh Purkait ◽  
Saikat Kumar Manna ◽  
Bankim Chandra Ghosh ◽  
Sudipta Pathak ◽  
...  
Keyword(s):  
Schiff Base ◽  
Limit Of Detection ◽  
Fluorescence Sensing ◽  
Intracellular Imaging ◽  
Hepes Buffer ◽  
Selective Sensor

Coumarinyl-rhodamine, HCR, served as an extremely selective sensor for Pd2+ ions in ethanol/H2O (8 : 2, v/v, HEPES buffer, pH 7.2) solution and the limit of detection (LOD) was 18.8 nM (3σ method).

scholarly journals A Fluorescence Inner-Filter Effect Based Sensing Platform for Turn-On Detection of Glutathione in Human Serum

Sensors ◽  
2019 ◽  
Vol 19 (2) ◽  
pp. 228 ◽  
Author(s):  
Shurong Tang ◽  
Xiuhua You ◽  
Quanhui Fang ◽  
Xin Li ◽  
Guangwen Li ◽  
...  
Keyword(s):  
Human Serum ◽  
Limit Of Detection ◽  
Cost Effective ◽  
Inner Filter Effect ◽  
Disease Diagnosis ◽  
Fluorescent Properties ◽  
Serum Samples ◽  
Turn On ◽  
Filter Effect ◽  
Sensing Platform

A novel turn-on fluorescence assay was developed for the rapid detection of glutathione (GSH) based on the inner-filter effect (IFE) and redox reaction. Molybdenum disulfide quantum dots (MoS2 QDs), which have stable fluorescent properties, were synthesized with hydrothermal method. Manganese dioxide nanosheets (MnO2 NSs) were prepared by exfoliating the bulk δ-MnO2 material in bovine serum albumin (BSA) aqueous solution. The morphology structures of the prepared nanoparticles were characterized by transmission electron microscope (TEM). Studies have shown that the fluorescence of MoS2 QDs could be quenched in the presence of MnO2 NSs as a result of the IFE, and is recovered after the addition of GSH to dissolve the MnO2 NSs. The fluorescence intensity showed a good linear relationship with the GSH concentration in the range 20–2500 μM, the limit of detection was 1.0 μM. The detection method was applied to the analysis of GSH in human serum samples. This simple, rapid, and cost-effective method has great potential in analyzing GSH and in disease diagnosis.

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