Synthesis of highly fluorescent gold nanoclusters and their use in sensitive analysis of metal ions

The Analyst ◽  
2017 ◽  
Vol 142 (23) ◽  
pp. 4486-4493 ◽  
Author(s):  
Yayu Yang ◽  
Ailing Han ◽  
Ruixue Li ◽  
Guozhen Fang ◽  
Jifeng Liu ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Metal Ions ◽  
Gold Nanoclusters ◽  
Emission Peak ◽  
Fluorescence Properties ◽  
Sensitive Analysis ◽  
The Core ◽  
Au Clusters

The fluorescence properties, including emission peak and quantum yield, of Au clusters are dependent upon the ligands capping the core.

scholarly journals Fluorescence properties of Neurospora tyrosinase

1982 ◽  
Vol 205 (1) ◽  
pp. 173-180 ◽  
Author(s):  
M Beltramini ◽  
K Lerch
Keyword(s):  
Quantum Yield ◽  
Fluorescence Spectroscopy ◽  
Metal Ions ◽  
Fluorescent Probe ◽  
Active Site ◽  
Emission Intensity ◽  
Marked Decrease ◽  
Emission Spectra ◽  
Fluorescence Properties ◽  
Tryptophan Residues

Some structural properties of Neurospora tyrosinase have been studied by fluorescence spectroscopy. The emission spectra observed for oxy-, deoxy-, met- and apo-tyrosinase and the Co2+-substituted form are indicative of a protein containing buried tryptophan residues. By using acrylamide and iodide, part of the emission is quenched, indicating heterogeneity in the tryptophan environment. Upon binding of Cu2+ or Co2+ to apo-tyrosinase, a marked decrease of the tryptophan quantum yield is observed. A further decrease in emission intensity results from the binding of molecular O2 to the deoxy form. The fluorescent probe 8-anilinonaphthalene-1-sulphonate binds to tyrosinase only when the metal ions are removed. Reconstitution of apo-tyrosinase with Cu2+ completely displaces the probe, suggesting that 8-anilinonaphthalene-1-sulphonate binds to apo-tyrosinase at the active site. The fluorescence properties of Neurospora tyrosinase are compared with those of haemocyanin.

Selective adsorption of uranyl and potentially toxic metal ions at the core-shell MFe2O4-TiO2 (M=Mn, Fe, Zn, Co, or Ni) nanoparticles

2019 ◽  
Vol 365 ◽  
pp. 835-845 ◽  
Author(s):  
Liang Bian ◽  
Jianan Nie ◽  
Xiaoqiang Jiang ◽  
Mianxin Song ◽  
Faqin Dong ◽  
...  
Keyword(s):  
Metal Ions ◽  
Selective Adsorption ◽  
Toxic Metal ◽  
Core Shell ◽  
Ni Nanoparticles ◽  
Toxic Metal Ions ◽  
The Core

scholarly journals P4.08 - Detection of metal ions using fluorescent gold nanoclusters

2017 ◽  
Author(s):  
M. Vogel ◽  
S. Matys ◽  
K. Pollmann ◽  
J. Raff
Keyword(s):  
Metal Ions ◽  
Gold Nanoclusters

Identification of proteins and bacteria based on a metal ion–gold nanocluster sensor array

2018 ◽  
Vol 10 (32) ◽  
pp. 3939-3944 ◽  
Author(s):  
Yayan Wu ◽  
Bing Wang ◽  
Kai Wang ◽  
Peng Yan
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Sensor Array ◽  
Gold Nanoclusters ◽  
Fluorescence Sensor ◽  
Gold Nanocluster

We report a simple fluorescence sensor array based on metal ions–gold nanoclusters (AuNCs) for the identification of proteins. The proposed method can also be used for bacteria sensing.

Visualized ratiometric fluorescence sensing system for copper ions based on gold nanoclusters/perovskite quantum dot @SiO2 nanocomposites

The Analyst ◽  
2021 ◽  
Author(s):  
Wanying Xue ◽  
Jiangyan Zhong ◽  
Haishan Wu ◽  
Jianhua Zhang ◽  
Yuwu Chi
Keyword(s):  
Quantum Dot ◽  
Metal Ions ◽  
Environmental Pollution ◽  
Copper Ions ◽  
Gold Nanoclusters ◽  
Ratiometric Fluorescence ◽  
Fluorescence Sensing ◽  
Sensing System ◽  
Sio2 Nanocomposites ◽  
Ratiometric Fluorescence Sensing

Excessive copper ions (Cu2+)cause serious environmental pollution and even endanger the health of organisms. Fluorescence chemosensing materials are widely used in the detection of metal ions due to their simple...

Facile Preparation of High-Quantum-Yield Gold Nanoclusters: Application to Probing Mercuric Ions and Biothiols

2014 ◽  
Vol 6 (21) ◽  
pp. 18824-18831 ◽  
Author(s):  
Heng-Chia Chang ◽  
Ying-Feng Chang ◽  
Nien-Chu Fan ◽  
Ja-an Annie Ho
Keyword(s):  
Quantum Yield ◽  
Gold Nanoclusters ◽  
High Quantum Yield ◽  
High Quantum ◽  
Mercuric Ions ◽  
Facile Preparation

Chilling Injury in Mature Leaves of Rice. II. Varietal Differences in the Response to Interactions Between Low Temperature and Light Measured by Chlorophyll Fluorescence at 77k and the Quantum Yield of Photosynthesis

1989 ◽  
Vol 16 (4) ◽  
pp. 339 ◽  
Author(s):  
LK Huang ◽  
CB Osmond ◽  
I Terashima
Keyword(s):  
Chlorophyll Fluorescence ◽  
Quantum Yield ◽  
Low Temperature ◽  
Chilling Injury ◽  
Bright Light ◽  
Co2 Exchange ◽  
Fluorescence Properties ◽  
Screening Programs ◽  
Detached Leaves

Characteristics of photosynthetic CO2 exchange and 77K chlorophyll fluorescence in attached and detached leaves of rice were used to examine differences between five varieties exposed to a combination of bright light and low temperature. Preliminary studies established that attached leaves of varieties did not differ in the light dependence of photosynthesis at CO2 saturation or fluorescence properties when grown in full sunlight and measured under comparable conditions. All varieties showed a depression in maximum photosynthetic rate, but not in quantum yield or chlorophyll fluorescence when examined in the late afternoon after a period of active photosynthesis in air at 25°C. Attached leaves of all varieties showed depression of the maximum rate of photosynthesis and of quantum yield as well as an increase in Fo and a decrease in Fv/Fm of chlorophyll fluorescence at 77K following horizontal exposure to bright light in air at 25°. Similar results were obtained with detached leaves exposed to bright light while floating on water at 25°C. The rate of photosynthetic CO2 fixation in air as a function of temperature was examined in attached leaves of two representative varieties, Japonica-like cv. Hungarian- 1, and Indica-derived cv. IR-8. The former was capable to rates of photosynthesis at 10°C which were twice those of the latter, although the rates at 25°C were similar in both varieties. When detached leaves of five varieties of rice were floated on water at 10°C while exposed to 700 �mol photons m-2 s-1 of white light, consistent differences in the response of quantum yield, light and CO2 saturated O2 evolion and 77K fluorescence properties were found. Exposure to bright light at low temperature exaggerated the effects of bright light on these parameters, and larger effects were found in the Indica-derived varieties than in Japonica-like cv. Hungarian-1. These treatments at 10°C did not influence the extent of increase in Fo, but led to a greater decline in Fv/Fm of 77K chlorophyll fluorescence compared with treatments at 25°C. Varieties in which there was a larger decline in Fv/Fm showed slower recovery of variable fluorescence in the dark at 25°C, and especially at 10°C. These responses to in vitro treatments seem capable of distinguishing varieties such as cvv. Hungarian-1 and Er Bai Ai, which are believed to be more chilling tolerant by other criteria, from chilling sensitive varieties such as Gui Chao-2 and IR-8. Even though there is potential for application of these methods in screening programs, there is little evidence that the lesions in primary photosynthetic processes indicated by these methods are significant determinants of photosynthesis under field conditions.

scholarly journals The Effect of Fatty Acids and BSA Purity on Synthesis and Properties of Fluorescent Gold Nanoclusters

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 343
Author(s):  
Pavlína Andrýsková ◽  
Karolína Machalová Šišková ◽  
Šárka Michetschlägerová ◽  
Klára Jiráková ◽  
Martin Kubala ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Quantum Yield ◽  
Bovine Serum Albumin ◽  
Fluorescence Lifetime ◽  
Bovine Serum ◽  
Gold Nanoclusters ◽  
Alamar Blue ◽  
Hep G2 ◽  
Other Substances ◽  
Protein Bovine Serum Albumin

Fluorescent gold nanoclusters (AuNCs) are envisaged as a novel type of fluorophores. This work reports on the first comparative study investigating the effect of presence/absence/abundance of fatty acids (namely palmitic acid, PA) or other substances (like glycoproteins and globulins) in the protein (bovine serum albumin, BSA) on synthesis and properties of the final AuNCs. The most popular template (BSA) and microwave (MW)-assisted synthesis of AuNCs have been intentionally chosen. Our results clearly demonstrate that the fluorescent characteristics (i.e., fluorescence lifetime and quantum yield) are affected by the fatty acids and/or other substances. Importantly, the as-prepared AuNCs are biocompatible, as determined by Alamar Blue assay performed on Hep G2 cell line.

scholarly journals Ligand-free gold nanoclusters confined in mesoporous silica nanoparticles for styrene epoxidation

2020 ◽  
Vol 2 (4) ◽  
pp. 1437-1442
Author(s):  
Buthainah Al-Shankiti ◽  
Walid Al-Maksoud ◽  
Madathumpady Abubaker Habeeb Muhammed ◽  
Dalaver H. Anjum ◽  
Basem Moosa ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Metal Ions ◽  
Silica Nanoparticles ◽  
Mesoporous Silica Nanoparticles ◽  
Gold Nanoclusters ◽  
Reducing Agents ◽  
Styrene Epoxidation ◽  
Novel Approach ◽  
Free Gold ◽  
Ligand Free

We present a novel approach to produce gold nanoclusters (Au NCs) in the pores of mesoporous silica nanoparticles (MSNs) by sequential and controlled addition of metal ions and reducing agents.

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