Difunctional biogenic Au nanoparticles for colorimetric detection and removal of Hg2+

RSC Advances ◽  
2015 ◽  
Vol 5 (53) ◽  
pp. 42931-42934 ◽  
Author(s):  
Hao Zhou ◽  
Yuanyuan Qu ◽  
Duanxing Li ◽  
Xuwang Zhang ◽  
Qiao Ma ◽  
...  
Keyword(s):  
Au Nanoparticles ◽  
Colorimetric Detection ◽  
Colorimetric Sensor ◽  
Biological Reduction ◽  
Cupriavidus Metallidurans

Biogenic Au nanoparticles (AuNPs) produced by Cupriavidus metallidurans SHE could act as a colorimetric sensor and scavenger of Hg2+ based on biological reduction mediated formation of an amalgam.

An anthracene–quinoline based dual-mode fluorometric–colorimetric sensor for the detection of Fe3+ and its application in live cell imaging

2021 ◽  
Author(s):  
Tahereh Tehrani ◽  
Soraia Meghdadi ◽  
Zohreh Salarvand ◽  
Behnam Tavakoli ◽  
Kiamars Eskandari ◽  
...  
Keyword(s):  
Live Cell Imaging ◽  
Cell Imaging ◽  
Colorimetric Detection ◽  
Colorimetric Sensor ◽  
Live Cell ◽  
Dual Mode ◽  
Highly Sensitive

A highly sensitive anthracene–quinoline based dual-mode sensor has been synthesized and used for the fluorometric and colorimetric detection of Fe3+ and in live cell imaging.

scholarly journals A rapid and ultrasensitive colorimetric biosensor based on aptamer functionalized Au nanoparticles for detection of saxitoxin

RSC Advances ◽  
2020 ◽  
Vol 10 (26) ◽  
pp. 15293-15298
Author(s):  
Le Qiang ◽  
Yu Zhang ◽  
Xin Guo ◽  
Yakun Gao ◽  
Yingkuan Han ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Au Nanoparticles ◽  
Colorimetric Sensor ◽  
Quantitative Detection ◽  
Au Nps

We demonstrate a facile and ultrasensitive colorimetric sensor based on gold nanoparticles (Au NPs) and aptamer (Au NPs-aptamer biosensor) for specific and quantitative detection of STX.

Colorimetric detection of heparin with high sensitivity based on the aggregation of gold nanoparticles induced by polymer nanoparticles

2017 ◽  
Vol 41 (19) ◽  
pp. 10592-10597 ◽  
Author(s):  
Fei Qu ◽  
Yanqun Liu ◽  
Haili Lao ◽  
Yaping Wang ◽  
Jinmao You
Keyword(s):  
Gold Nanoparticles ◽  
Au Nanoparticles ◽  
Colorimetric Detection ◽  
High Sensitivity ◽  
Cationic Polymer ◽  
Polymer Nanoparticles

The negatively charged heparin hinders the aggregation of Au nanoparticles induced by the cationic polymer nanodots.

scholarly journals Simple and Sensitive Colorimetric Detection of Dopamine Based on Assembly of Cyclodextrin-Modified Au Nanoparticles

Small ◽  
2016 ◽  
Vol 12 (18) ◽  
pp. 2439-2442 ◽  
Author(s):  
Dan Wen ◽  
Wei Liu ◽  
Anne-Kristin Herrmann ◽  
Danny Haubold ◽  
Matthias Holzschuh ◽  
...  
Keyword(s):  
Au Nanoparticles ◽  
Colorimetric Detection

A colorimetric sensor of H2O2 based on Co3O4–montmorillonite nanocomposites with peroxidase activity

2018 ◽  
Vol 42 (2) ◽  
pp. 1501-1509 ◽  
Author(s):  
Xixi Zhu ◽  
Wei Chen ◽  
Kaili Wu ◽  
Hongyu Li ◽  
Min Fu ◽  
...  
Keyword(s):  
Peroxidase Activity ◽  
Colorimetric Detection ◽  
Colorimetric Sensor ◽  
Montmorillonite Nanocomposites

Schematic of the colorimetric detection of H2O2 catalyzed using Co3O4–MMT NPs.

scholarly journals Au Nanoparticles Based Colorimetric Detection of Conformational Changes in Cytochrome c

2010 ◽  
Vol 26 (09) ◽  
pp. 2468-2472
Author(s):  
LI Na ◽  
◽  
ZHOU Jian-Zhang ◽  
LIN Ling-Ling ◽  
HAN Nan-Nan ◽  
...  
Keyword(s):  
Cytochrome C ◽  
Conformational Changes ◽  
Au Nanoparticles ◽  
Colorimetric Detection

scholarly journals Robust colorimetric detection based on the anti-aggregation of gold nanoparticles for bromide in rice samples

RSC Advances ◽  
2018 ◽  
Vol 8 (38) ◽  
pp. 21566-21576 ◽  
Author(s):  
Siwat Plaisen ◽  
Wilairat Cheewasedtham ◽  
Thitima Rujiralai
Keyword(s):  
Gold Nanoparticles ◽  
Colorimetric Detection ◽  
Colorimetric Sensor ◽  
Selective Detection ◽  
Bromide Ions ◽  
Rice Samples

In this work, we developed a AuNP colorimetric sensor for the facile, sensitive and selective detection of bromide ions in rice samples.

scholarly journals Synergistic Toxicity of Copper and Gold Compounds in Cupriavidus metallidurans

2017 ◽  
Vol 83 (23) ◽  
Author(s):  
Nicole Wiesemann ◽  
Lucy Bütof ◽  
Martin Herzberg ◽  
Gerd Hause ◽  
Lutz Berthold ◽  
...  
Keyword(s):  
Molecular Mechanisms ◽  
Au Nanoparticles ◽  
Copper Ions ◽  
Mineral Exploration ◽  
Copper Resistance ◽  
Content Type ◽  
Cu Content ◽  
Cupriavidus Metallidurans ◽  
Cu Ions ◽  
Synergistic Toxicity

ABSTRACTThe bacteriumCupriavidus metalliduranscan reduce toxic gold(I/III) complexes and biomineralize them into metallic gold (Au) nanoparticles, thereby mediating the (trans)formation of Au nuggets. In Au-rich soils, most transition metals do not interfere with the resistance of this bacterium to toxic mobile Au complexes and can be removed from the cell by plasmid-encoded metal efflux systems. Copper is a noticeable exception: the presence of Au complexes and Cu ions results in synergistic toxicity, which is accompanied by an increased cytoplasmic Cu content and formation of Au nanoparticles in the periplasm. The periplasmic Cu-oxidase CopA was not essential for formation of the periplasmic Au nanoparticles. As shown with the purified and reconstituted Cu efflux system CupA, Au complexes block Cu-dependent release of phosphate from ATP by CupA, indicating inhibition of Cu transport. Moreover, Cu resistance of Au-inhibited cells was similar to that of mutants carrying deletions in the genes for the Cu-exporting PIB1-type ATPases. Consequently, Au complexes inhibit export of cytoplasmic Cu ions, leading to an increased cellular Cu content and decreased Cu and Au resistance. Uncovering the biochemical mechanisms of synergistic Au and Cu toxicity inC. metalliduransexplains the issues this bacterium has to face in auriferous environments, where it is an important contributor to the environmental Au cycle.IMPORTANCEC. metalliduranslives in metal-rich environments, including auriferous soils that contain a mixture of toxic transition metal cations. We demonstrate here that copper ions and gold complexes exert synergistic toxicity because gold ions inhibit the copper-exporting P-type ATPase CupA, which is central to copper resistance in this bacterium. Such a situation should occur in soils overlying Au deposits, in which Cu/Au ratios usually are ≫1. Appreciating howC. metalliduranssolves the problem of living in environments that contain both Au and Cu is a prerequisite to understand the molecular mechanisms underlying gold cycling in the environment, and the significance and opportunities of microbiota for specific targeting to Au in mineral exploration and ore processing.

Synthesis of dual-functional Ag/Au nanoparticles based on the decreased cavitating rate under alkaline conditions and the colorimetric detection of mercury(ii) and lead(ii)

2018 ◽  
Vol 6 (28) ◽  
pp. 7557-7567 ◽  
Author(s):  
Ting-Yang Xing ◽  
Jing Zhao ◽  
Guo-Jun Weng ◽  
Jian-Jun Li ◽  
Jian Zhu ◽  
...  
Keyword(s):  
Au Nanoparticles ◽  
Colorimetric Detection ◽  
Core Shell ◽  
Specific Detection ◽  
Shell Nanoparticles ◽  
Dual Functional ◽  
Alkaline Conditions ◽  
Core Shell Nanoparticles

Synthesis of Ag/Au core–shell nanoparticles with two LSPR modes and the specific detection of Hg2+and Pb2+.

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