scholarly journals Highly Sensitive and Selective Fluorescence “Turn-On” Detection of Pb (II) Based on Fe3O4@Au–FITC Nanocomposite

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3180
Author(s):  
Yina Cai ◽  
Binxue Ren ◽  
Chifang Peng ◽  
Cunzheng Zhang ◽  
Xinlin Wei
Keyword(s):  
Detection Limit ◽  
Lake Water ◽  
Fluorescent Detection ◽  
Fluorescence Recovery ◽  
Turn On ◽  
Fluorescent Method ◽  
Lake Water Sample ◽  
Highly Sensitive ◽  
Fluorescence Turn On ◽  
Optimized Conditions

New nanocomposites, Fe3O4@Au–FITC, were prepared and explored to develop a fluorescent detection of Pb2+. The Fe3O4@AuNPs–FITC nanocomposites could be etched by Pb2+ in the presence of Na2S2O3, leading to fluorescence recovery of FITC quenched by Fe3O4@Au nanocomposites. With the increase of Pb2+ concentration, the fluorescence recovery of Fe3O4@AuNPs–FITC increased gradually. Under optimized conditions, a detection limit of 5.2 nmol/L of Pb2+ with a linear range of 0.02–2.0 µmol/L were obtained. The assay demonstrated negligible response to common metal ions. Recoveries of 98.2–106.4% were obtained when this fluorescent method was applied in detecting Pb2+ spiked in a lake-water sample. The above results demonstrated the high potential of ion-induced nanomaterial etching in developing robust fluorescent assays.

scholarly journals A 7-Hydroxybenzoxazinone-Containing Fluorescence Turn-On Probe for Biothiols and Its Bioimaging Applications

Molecules ◽  
2019 ◽  
Vol 24 (17) ◽  
pp. 3102 ◽  
Author(s):  
Bin Li ◽  
Datong Zhang ◽  
Ruibing An ◽  
Yaling Zhu
Keyword(s):  
Amino Acids ◽  
Detection Limit ◽  
High Resistance ◽  
Hela Cells ◽  
Fluorescence Enhancement ◽  
Stokes Shift ◽  
Potential Utility ◽  
Strong Fluorescence ◽  
Turn On ◽  
Fluorescence Turn On

In this work, a novel 7-hydroxybenzoxazinone-based fluorescent probe (PBD) for the selective sensing of biothiols is reported. Upon treatment with biothiols, PBD shows a strong fluorescence enhancement (up to 70-fold) and a large Stokes shift (155 nm). Meanwhile, this probe exhibits high resistance to interference from other amino acids and competing species. PBD features good linearity ranges with a low detection limit of 14.5 nM for glutathione (GSH), 17.5 nM for cysteine (Cys), and 80.0 nM for homocysteine (Hcy), respectively. Finally, the potential utility of this probe for biothiol sensing in living HeLa cells is demonstrated.

Thieno[3,2-c]pyran: an ESIPT based fluorescence “turn-on” molecular chemosensor with AIE properties for the selective recognition of Zn2+ ion

2020 ◽  
Vol 44 (28) ◽  
pp. 12019-12026 ◽  
Author(s):  
Divya Singhal ◽  
Ismail Althagafi ◽  
Ashish Kumar ◽  
Saroj Yadav ◽  
Ashok K. Prasad ◽  
...  
Keyword(s):  
Detection Limit ◽  
Selective Recognition ◽  
Turn On ◽  
Low Detection Limit ◽  
Fluorescence Turn On

Thieno[3,2-c]pyran was synthesized as a fluorescent turn-on chemosensor for the selective recognition of Zn2+ ions with a low detection limit (0.67 μM), and it also exhibited AIE properties.

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.

scholarly journals Graphene quantum dots based fluorescence turn-on nanoprobe for highly sensitive and selective imaging of hydrogen sulfide in living cells

2018 ◽  
Vol 6 (4) ◽  
pp. 779-784 ◽  
Author(s):  
Nan Li ◽  
Aung Than ◽  
Jie Chen ◽  
Fengna Xi ◽  
Jiyang Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Hydrogen Sulfide ◽  
Real Time ◽  
Dynamic Change ◽  
Graphene Quantum Dots ◽  
Living Cells ◽  
Real Time Monitoring ◽  
Turn On ◽  
Highly Sensitive ◽  
Fluorescence Turn On

Graphene quantum dots-based fluorescent turn-on nanoprobe is developed for real-time monitoring the triggered dynamic change of intracellular H2S.

Development of a Highly Sensitive Chemiluminescence Enzyme Immunoassay for the Determination of Bisphenol A

2013 ◽  
Vol 726-731 ◽  
pp. 1283-1286
Author(s):  
Li Rui Liu ◽  
Li Qin Liu ◽  
Xue Qing Chen ◽  
Guo Qing Shi
Keyword(s):  
Detection Limit ◽  
Bisphenol A ◽  
Enzyme Immunoassay ◽  
Rapid Determination ◽  
Secondary Antibody ◽  
Average Recovery ◽  
Highly Sensitive ◽  
Optimized Conditions ◽  
Chemiluminescence Enzyme Immunoassay

A highly sensitive chemiluminescence enzyme immunoassay (CLEIA) method for the determination of bisphenol A (BPA) was developed, which used a secondary antibody labeled with horseradish peroxidase detected with a luminol-based substrate. Under the optimized conditions, the linear range was 0.01μg/mL~0.74μg/mL, and the detection limit was 0.008μg/mL. The average recovery for BPA in barreled water was 104%. This developed method could be applied for the selective, high-throughput, and rapid determination of BPA in barreled water.

Highly sensitive turn-on fluorescent detection of cartap via a nonconjugated gold nanoparticle–quantum dot pair mediated by inner filter effect

RSC Advances ◽  
2014 ◽  
Vol 4 (52) ◽  
pp. 27228-27235 ◽  
Author(s):  
Jiajia Guo ◽  
Xin Liu ◽  
Hanting Gao ◽  
Jiaxin Bie ◽  
Yan Zhang ◽  
...  
Keyword(s):  
Absorption Band ◽  
Inner Filter Effect ◽  
Fluorescent Detection ◽  
Wavelength Band ◽  
Long Wavelength ◽  
Turn On ◽  
Highly Sensitive ◽  
Band Transition ◽  
Amine Groups ◽  
Positively Charged

The well-dispersed AuNPs exhibited a tendency to aggregate when exposed to cartap with positively charged amine groups, which induced an absorption band transition from 522 nm to the long-wavelength band, and restored the IFE-decreased emission of CdTe QDs for cartap detection.

Photo-induced electron transfer in a metal–organic framework: a new approach towards a highly sensitive luminescent probe for Fe3+

2019 ◽  
Vol 55 (75) ◽  
pp. 11231-11234 ◽  
Author(s):  
Yuanjing Cui ◽  
Dan Yue ◽  
Yike Huang ◽  
Jun Zhang ◽  
Zhiyu Wang ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Detection Limit ◽  
Metal Organic Framework ◽  
Mixed Ligand ◽  
Luminescent Probe ◽  
New Approach ◽  
Turn On ◽  
Highly Sensitive ◽  
Metal Organic ◽  
Photo Induced Electron Transfer

By utilizing the d-PET process between ligands 4,4′-bimbp and H2pta in a Co-based mixed-ligand MOF, ZJU-109, a fluorescent turn-on sensor for Fe3+ with a detection limit as low as 0.053 μM has been demonstrated.

Graphene nanosensor for highly sensitive fluorescence turn-on detection of Hg2+based on target recycling amplification

RSC Advances ◽  
2014 ◽  
Vol 4 (73) ◽  
pp. 39082 ◽  
Author(s):  
Yulian Wei ◽  
Wenjiao Zhou ◽  
Yunying Xu ◽  
Yun Xiang ◽  
Ruo Yuan ◽  
...  
Keyword(s):  
Target Recycling ◽  
Turn On ◽  
Highly Sensitive ◽  
Recycling Amplification ◽  
Fluorescence Turn On
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