Four orders-of-magnitude enhancement in the two-photon excited photoluminescence of homoleptic gold thiolate nanoclusters following zinc ion-induced aggregation

Nanoscale ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 4439-4443
Author(s):  
Srestha Basu ◽  
Hussein Fakhouri ◽  
Christophe Moulin ◽  
Santanu Dolai ◽  
Isabelle Russier-Antoine ◽  
...  
Keyword(s):  
Gold Nanoclusters ◽  
Zinc Ion ◽  
Zinc Ions ◽  
Two Photon ◽  
Gold Thiolate ◽  
Induced Aggregation

Four orders-of-magnitude enhancement in two-photon excited photoluminescence of gold nanoclusters has been observed following complexation with zinc ions.

scholarly journals Zinc Induced Aβ16 Aggregation Modeled by Molecular Dynamics

2021 ◽  
Vol 22 (22) ◽  
pp. 12161
Author(s):  
Anna P. Tolstova ◽  
Alexander A. Makarov ◽  
Alexei A. Adzhubei
Keyword(s):  
Molecular Dynamics ◽  
Metal Binding ◽  
Amyloid Fibrils ◽  
Beta Amyloid ◽  
Zinc Ion ◽  
Amyloid Peptide ◽  
Zinc Ions ◽  
Amyloid Peptides ◽  
Induced Aggregation ◽  
Favorable Structure

It is widely accepted that the addition of zinc leads to the formation of neurotoxic nonfibrillar aggregates of beta-amyloid peptides Aβ40 and Aβ42 and at the same time destabilizes amyloid fibrils. However, the mechanism of the effect of zinc on beta-amyloid is not fully understood. In this study, a fast zinc-induced aggregation of Aβ16 (as compared to a system without zinc) via the formation of Aβ16 dimers with one zinc ion coordinated in the metal-binding site 11EVHH14, followed by their polymerization, has been studied by molecular dynamics. The best aggregation was shown by the system composed of Aβ16 dimers bound by one zinc ion, with no additional zinc in solution. The presence of Aβ16 dimers was a major condition, sufficient for fast aggregation into larger complexes. It has been shown that the addition of zinc to a system with already formed dimers does not substantially affect the characteristics and rate of aggregation. At the same time, an excessive concentration of zinc at the early stages of the formation of conglomerates can negatively affect aggregation, since in systems where zinc ions occupied the 11EVHH14 coordination center and the His6 residue of every Aβ16 monomer, the aggregation proceeded more slowly and the resulting complexes were not as large as in the zinc-free Aβ system. Thus, this study has shown that the formation of Aβ16 dimers bound through zinc ions at the 11EVHH14 sites of the peptides plays an important role in the formation of neurotoxic non-fibrillar aggregates of beta-amyloid peptide Aβ16. The best energetically favorable structure has been obtained for the complex of two Aβ16 dimers with two zinc ions.

Microbial-Induced Mineralization of Zinc Ions Based on the Degradation of Toluene and Its Characterization

2021 ◽  
Vol 13 (4) ◽  
pp. 656-661
Author(s):  
Yiyan Lv ◽  
Qiwei Zhan ◽  
Xiaoniu Yu
Keyword(s):  
Particle Size ◽  
Phase Composition ◽  
Surface Morphology ◽  
Organic Compounds ◽  
Low Cost ◽  
Zinc Ion ◽  
Zinc Ions ◽  
Quick Response ◽  
Zinc Carbonate ◽  
Carbonate Ions

Microbial-induced degradation of aromatic organic compounds and mineralization of zinc ions have attracted much attention because of its low cost, simple operation and quick response. This research, toluene was decomposed and made the concentration of carbonate ions increased accordingly by the enzymatic pressing of microorganisms, meanwhile carbonate ions mineralized zinc ions into carbonate precipitations. The composition and microstructure were analyzed systematically. The analysis results indicated that carbonate precipitations, basic zinc carbonate, could be successfully prepared by microbial method. The particle size of basic zinc carbonate was nanometer, and its shape was near-spherical. Furthermore, the phase composition, functional groups and surface morphology of the precipitations prepared by different methods were basically the same. This work provided a new method for remediation of zinc ion pollution based on the degradation of toluene.

scholarly journals Two-Photon Time-Gated In Vivo Imaging of Dihydrolipoic-Acid-Decorated Gold Nanoclusters

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7744
Author(s):  
Ye Tian ◽  
Ming Wei ◽  
Lijun Wang ◽  
Yuankai Hong ◽  
Dan Luo ◽  
...  
Keyword(s):  
In Vivo Imaging ◽  
Gold Nanoclusters ◽  
Photon Absorption ◽  
Gold Nanocluster ◽  
Time Resolved ◽  
Dihydrolipoic Acid ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Time Resolved Imaging

Due to the unique advantages of two-photon technology and time-resolved imaging technology in the biomedical field, attention has been paid to them. Gold clusters possess excellent physicochemical properties and low biotoxicity, which make them greatly advantageous in biological imaging, especially for in vivo animal imaging. A gold nanocluster was coupled with dihydrolipoic acid to obtain a functionalized nanoprobe; the material displayed significant features, including a large two-photon absorption cross-section (up to 1.59 × 105 GM) and prolonged fluorescence lifetime (>300 ns). The two-photon and time-resolution techniques were used to perform cell imaging and in vivo imaging.

scholarly journals Removal of Zinc ions from industrial wastewater with wool fibers

2010 ◽  
Vol 7 (3) ◽  
pp. 1193-1201
Author(s):  
Baghdad Science Journal
Keyword(s):  
Acid Concentration ◽  
Contact Time ◽  
Industrial Wastewater ◽  
Metal Ion ◽  
Low Cost ◽  
Zinc Ion ◽  
Ion Concentration ◽  
Natural Material ◽  
Zinc Ions ◽  
Wool Fibers

In this research, the efficiency of low-cost unmodified wool fibers were used to remove zinc ion from industrial wastewater. Removal of zinc ion was achieved at 99.52% by using simple wool column. The experiment was carried out under varying conditions of (2h) contact time, metal ion concentration (50mg/l), wool fibers quantity to treated water (70g/l), pH(7) & acid concentration (0.05M). The aim of this method is to use a high sensitive, available & cheep natural material which applied successfully for industrial wastewater& synthetic water, where zinc ion concentration was reduced from (14.6mg/l) to (0.07mg/l) & consequently the hazardous effect of contamination was minimized.

Combination of chemical etching of gold nanoclusters with aggregation-induced emission for preparation of new phosphors for the development of UV-driven phosphor-converted white light-emitting diodes

2016 ◽  
Vol 4 (48) ◽  
pp. 11482-11487 ◽  
Author(s):  
Xin Lu ◽  
Tao Wang ◽  
Tong Shu ◽  
Xuanhui Qu ◽  
Xueji Zhang ◽  
...  
Keyword(s):  
White Light ◽  
Chemical Etching ◽  
Light Emitting Diodes ◽  
Gold Nanoclusters ◽  
Light Emitting ◽  
Aggregation Induced Emission ◽  
White Light Emitting Diodes ◽  
Induced Aggregation

The preparation of white light-emitting phosphors via TECP-induced etching of GNCs@BSA and Cd2+-induced aggregation, followed by grinding with GNCs@BSA.

Unconventional application of gold nanoclusters/Zn-MOF composite for fluorescence turn-on sensitive detection of zinc ion

2018 ◽  
Vol 1024 ◽  
pp. 145-152 ◽  
Author(s):  
Yuanyuan Li ◽  
Xue Hu ◽  
Xiaodan Zhang ◽  
Haiyan Cao ◽  
Yuming Huang
Keyword(s):  
Gold Nanoclusters ◽  
Zinc Ion ◽  
Sensitive Detection ◽  
Turn On ◽  
Fluorescence Turn On

scholarly journals Ligand shell size effects on one- and two-photon excitation fluorescence of zwitterion functionalized gold nanoclusters

2019 ◽  
Vol 21 (43) ◽  
pp. 23916-23921 ◽  
Author(s):  
Martina Perić ◽  
Željka Sanader Maršić ◽  
Isabelle Russier-Antoine ◽  
Hussein Fakhouri ◽  
Franck Bertorelle ◽  
...  
Keyword(s):  
Optical Properties ◽  
Size Effects ◽  
Gold Nanoclusters ◽  
Shell Size ◽  
Two Photon ◽  
Photon Excitation ◽  
Ligand Shell ◽  
Aqueous Solvent ◽  
The One ◽  
Two Photon Excitation

The effects of explicit ligands and of aqueous solvent on optical properties and in particular on the one- and two-photon excitation fluorescence of zwitterion functionalized gold nanoclusters have been studied.

scholarly journals A mitochondria-targeted ratiometric two-photon fluorescent probe for biological zinc ions detection

2016 ◽  
Vol 77 ◽  
pp. 921-927 ◽  
Author(s):  
Peng Ning ◽  
Jiacheng Jiang ◽  
Longchun Li ◽  
Shuxin Wang ◽  
Haizhu Yu ◽  
...  
Keyword(s):  
Fluorescent Probe ◽  
Zinc Ions ◽  
Two Photon

Development of flow injection analysis-solid phase extraction based on ion imprinted polymeric nanoparticles as an efficient and selective technique for preconcentration of zinc ions from aqueous solution

2017 ◽  
Vol 41 (17) ◽  
pp. 8828-8836 ◽  
Author(s):  
Fereshteh Fereidoonipour ◽  
Hamid Reza Rajabi
Keyword(s):  
Solid Phase Extraction ◽  
Flow Injection ◽  
Flow Injection Analysis ◽  
Solid Phase ◽  
Polymeric Nanoparticles ◽  
Zinc Ion ◽  
Phase Extraction ◽  
Zinc Ions ◽  
Ion Imprinted ◽  
Separation And Preconcentration

Here, a new flow injection analysis-solid phase extraction (FIA-SPE) technique was developed by using zinc ion imprinted polymeric nanoparticles (Zn-IIP NPs) for the separation and preconcentration of Zn2+ions from aqueous solutions.

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