Single Molecular Functionalized Gold Nanoparticles for Hydrogen-Bonding Recognition and Colorimetric Detection of Dopamine with High Sensitivity and Selectivity

2013 ◽  
Vol 5 (4) ◽  
pp. 1226-1231 ◽  
Author(s):  
Jiu-Ju Feng ◽  
Han Guo ◽  
Yong-Fang Li ◽  
Yun-Hua Wang ◽  
Wan-Yi Chen ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Hydrogen Bonding ◽  
Colorimetric Detection ◽  
High Sensitivity ◽  
Functionalized Gold Nanoparticles ◽  
Sensitivity And Selectivity

scholarly journals Smartphone-Based Colorimetric Detection of Chromium (VI) by Maleic Acid-Functionalized Gold Nanoparticles

2021 ◽  
Vol 11 (22) ◽  
pp. 10894
Author(s):  
Ahmed Mohamed ◽  
Xuemeng Li ◽  
Chengfei Li ◽  
Xuegang Li ◽  
Chao Yuan ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Maleic Acid ◽  
Colorimetric Detection ◽  
High Sensitivity ◽  
Quantitative Detection ◽  
Resource Constrained ◽  
Functionalized Gold Nanoparticles ◽  
Chromium Vi ◽  
Red Color ◽  
Sensitivity And Selectivity

Because of the significant environmental pollution produced by human activities, there is an ongoing need to develop transportable, simple, and reliable techniques for determining trace contaminants on the spot. This work reported a colorimetric detection method for aqueous Cr(VI) sensing by maleic acid-functionalized gold nanoparticles with high sensitivity and selectivity. The wine-red color of the probe solution can change to gray even in the presence of 1.0 µg L−1 of aqueous Cr(VI). Moreover, with the assistance of a smartphone installed with a commercially available color scan application software, its concentration of could be readily quantified on the spot without the help of UV-Vis spectrometer. The detection limit could reach as low as 0.1 µg L−1 with linear range from 0.2 to 2.0 µg L−1. Most importantly, the coefficient variation of the proposed smartphone-based method was equivalent to that of colorimetry, demonstrating the high accuracy of the proposed method for accurate detection of Cr(VI) in resource-constrained countries. Conclusively, with the help of the smartphone, this nanomaterials-based probe demonstrated the potential in the field of environment monitoring for on-site quantitative detection of any pollutants in resource-constrained countries.

Stable gold nanoparticles as a novel peroxidase mimic for colorimetric detection of cysteine

2016 ◽  
Vol 8 (11) ◽  
pp. 2494-2501 ◽  
Author(s):  
Rong Sheng Li ◽  
Hai Liu ◽  
Bin Bin Chen ◽  
Hong Zhi Zhang ◽  
Cheng Zhi Huang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Colorimetric Detection ◽  
High Sensitivity ◽  
Peroxidase Mimic ◽  
Sensitivity And Selectivity ◽  
Blue Solution

In this work, stable gold nanoparticles (AuNPs) were prepared with good compatibility and favorable catalytic activity. They were developed as a peroxidase mimic for colorimetric detection of cysteine with a weakened blue solution, which supplied high sensitivity and selectivity.

Non-enzymatic colorimetric sensor strip based on melamine-functionalized gold nanoparticles assembled on polyamide nanofiber membranes for the detection of metronidazole

2019 ◽  
Vol 11 (29) ◽  
pp. 3706-3713 ◽  
Author(s):  
Mohammed Awad Abedalwafa ◽  
Yan Li ◽  
Chunfang Ni ◽  
Gang Yang ◽  
Lu Wang
Keyword(s):  
Gold Nanoparticles ◽  
Color Change ◽  
High Sensitivity ◽  
Colorimetric Sensor ◽  
Eye Detection ◽  
Naked Eye ◽  
Functionalized Gold Nanoparticles ◽  
Sensitivity And Selectivity ◽  
Nanofiber Membranes ◽  
Naked Eye Detection

Non-enzymatic colorimetric sensor strip for detection of metronidazole (MTZ) was designed and constructed, with high sensitivity and selectivity. Which can be used for naked-eye detection of MTZ with a visible color change from pink to purple.

scholarly journals Effective reduction of nitrophenols and colorimetric detection of Pb(ii) ions by Siraitia grosvenorii fruit extract capped gold nanoparticles

RSC Advances ◽  
2021 ◽  
Vol 11 (25) ◽  
pp. 15438-15448
Author(s):  
Van Thuan Le ◽  
Truong Giang Duong ◽  
Van Tan Le ◽  
Thanh Long Phan ◽  
Thi Lan Huong Nguyen ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Colorimetric Detection ◽  
High Sensitivity ◽  
Fruit Extract ◽  
Siraitia Grosvenorii ◽  
Effective Reduction ◽  
Sensitivity And Selectivity

Siraitia grosvenorii fruit extract capped AuNPs exhibited excellent catalytic activity in the reduction of nitrophenols and high sensitivity and selectivity for detection of Pb(ii) ions.

scholarly journals X-ray Fluorescence Uptake Measurement of Functionalized Gold Nanoparticles in Tumor Cell Microsamples

2021 ◽  
Vol 22 (7) ◽  
pp. 3691
Author(s):  
Oliver Schmutzler ◽  
Sebastian Graf ◽  
Nils Behm ◽  
Wael Y. Mansour ◽  
Florian Blumendorf ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Irradiation Time ◽  
High Sensitivity ◽  
Nanoparticle Uptake ◽  
X Ray ◽  
Functionalized Gold Nanoparticles ◽  
Uptake Measurement ◽  
Prostate Tumor Cells ◽  
Non Destructive

Quantitative cellular in vitro nanoparticle uptake measurements are possible with a large number of different techniques, however, all have their respective restrictions. Here, we demonstrate the application of synchrotron-based X-ray fluorescence imaging (XFI) on prostate tumor cells, which have internalized differently functionalized gold nanoparticles. Total nanoparticle uptake on the order of a few hundred picograms could be conveniently observed with microsamples consisting of only a few hundreds of cells. A comparison with mass spectroscopy quantification is provided, experimental results are both supported and sensitivity limits of this XFI approach extrapolated by Monte-Carlo simulations, yielding a minimum detectable nanoparticle mass of just 5 pg. This study demonstrates the high sensitivity level of XFI, allowing non-destructive uptake measurements with very small microsamples within just seconds of irradiation time.

scholarly journals A simple and sensitive sensor for silver ions based on unmodified gold nanoparticles by using dynamic light scattering techniques

2017 ◽  
Vol 95 (12) ◽  
pp. 1267-1272 ◽  
Author(s):  
Zhiyou Xiao ◽  
Anjiang Tang ◽  
Hongsheng Huang ◽  
Ze Wang
Keyword(s):  
Gold Nanoparticles ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
High Sensitivity ◽  
Silver Ions ◽  
Hydrodynamic Diameter ◽  
Optimum Conditions ◽  
Sensitivity And Selectivity ◽  
Sensitive Sensor ◽  
Average Hydrodynamic Diameter

A simple and sensitive assay for Ag+ was developed with unmodified gold nanoparticles (AuNPs) by using dynamic light scattering techniques. Ag+ could induce the oligonucleotide (5′-ATC ACT ATA TCA TAT ACT CAT-3′) to change from a single-stranded structure to a double-stranded structure and desorb from the surface of AuNPs, which triggered the aggregation of AuNPs in the salt solution. The average hydrodynamic diameter of aggregated AuNPs could be detected by using dynamic light scattering techniques. Under the optimum conditions, the average hydrodynamic diameter of AuNPs is proportional to the concentration of Ag+ within the range of 13.3–100.0 nmol/L, with a detection limit of 3.2 nmol/L. The method is easy to operate and has low sample consumption, high sensitivity and selectivity.

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