Rapid and sensitive colorimetric sensing of the insecticide pymetrozine using melamine-modified gold nanoparticles

2018 ◽  
Vol 10 (4) ◽  
pp. 417-421 ◽  
Author(s):  
Jing-yan Kang ◽  
Yu-jie Zhang ◽  
Xing Li ◽  
Chen Dong ◽  
Hong-yu Liu ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Natural Water ◽  
Visual Detection ◽  
Detection Limits ◽  
High Sensitivity ◽  
Food Samples ◽  
Colorimetric Sensing ◽  
Au Nps

A rapid, selective, visual detection sensor with high sensitivity and low detection limits for the pesticide pymetrozine (PYM) was prepared from melamine-modified gold nanoparticles (M-Au NPs), and shown to be effective in both natural water and food samples.

Simple and Cost Effective Polymer Modified Gold Nanoparticles Based on Colorimetric Determination of L-Cysteine in Food Samples

2021 ◽  
Vol 34 (1) ◽  
pp. 41-57
Author(s):  
Beeta Rani Khalkho ◽  
Anushree Saha ◽  
Bhuneshwari Sahu ◽  
Manas Kanti Deb
Keyword(s):  
Gold Nanoparticles ◽  
High Sensitivity ◽  
Cost Effective ◽  
Food Samples ◽  
Colorimetric Determination ◽  
Plasmon Resonance Band ◽  
Transmission Electron ◽  
Resonance Band ◽  
Absorbance Band

Abstract. The purpose of the present research was to design a method for the colorimetric determination of L-cysteine. We have employed PVA capped gold nanoparticles (GNPs) as a probe. The as-synthesized GNPs were further characterized by UV-vis absorption spectroscopy, transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS) and Zeta potential analyser. The results show that the presence of L-cysteine caused the quenching of the surface plasmon resonance band of the GNPs at 524 nm. It was accompanied by the appearance of a new absorbance of a new absorbance band at 670 nm. The color of the colloidal GNPs changed from wine red to blue. The change in color of the GNPs was due to their aggregation induced by the presence of L-cysteine. Based on these observations, the as-synthesized GNPs were utilized to develop a novel colorimetric sensor for L-cysteine detection in food samples. Significantly, other biomolecules such as alanine, proline, phenylalanine, tryptophane, valine, arginine, glutamic acid, lysine and histidine did not cause any change in the color of the GNPs solutions. This colorimetric probe showed excellent selectivity and high sensitivity for L-cysteine with a detection limit of 2.0 μg mL-1.

Sensitive and selective colorimetric sensing of Fe3+ion by using p-amino salicylic acid dithiocarbamate functionalized gold nanoparticles

2014 ◽  
Vol 38 (4) ◽  
pp. 1503-1511 ◽  
Author(s):  
Vaibhavkumar N. Mehta ◽  
Suresh Kumar Kailasa ◽  
Hui-Fen Wu
Keyword(s):  
Gold Nanoparticles ◽  
Salicylic Acid ◽  
Biological Samples ◽  
Colorimetric Sensing ◽  
Au Nps ◽  
Functionalized Gold Nanoparticles ◽  
Amino Salicylic Acid

DTC-PAS-Au NPs successfully acted as probes for the selective and sensitive colorimetric sensing of Fe3+ions in biological samples.

Dicoumarol assisted synthesis of water dispersible gold nanoparticles for colorimetric sensing of cysteine and lysozyme in biofluids

RSC Advances ◽  
2015 ◽  
Vol 5 (49) ◽  
pp. 39182-39191 ◽  
Author(s):  
Betha Saineelima B. Kasibabu ◽  
Jigna R. Bhamore ◽  
Stephanie L. D'souza ◽  
Suresh Kumar Kailasa
Keyword(s):  
Gold Nanoparticles ◽  
Colorimetric Sensing ◽  
Schematic Representation ◽  
Au Nps ◽  
Water Dispersible

A schematic representation of the mechanism for the colorimetric sensing of Cys and Lys using DIC–Au NPs as a probe.

2,3,4-Trihydroxy benzophenone as a novel reducing agent for one-step synthesis of size-optimized gold nanoparticles and their application in colorimetric sensing of adenine at nanomolar concentration

RSC Advances ◽  
2016 ◽  
Vol 6 (14) ◽  
pp. 11099-11108 ◽  
Author(s):  
Karuna A. Rawat ◽  
Suresh Kumar Kailasa
Keyword(s):  
Gold Nanoparticles ◽  
Reducing Agent ◽  
Colorimetric Sensing ◽  
Au Nps ◽  
Stabilizing Agent ◽  
Nanomolar Concentration ◽  
One Step

2,3,4-trihydroxy benzophenone acts as a novel reducing and stabilizing agent for one-step synthesis of size-optimized Au NPs and used as a probe for colorimetric sensing of adenine.

scholarly journals Colorimetric Sensing with Gold Nanoparticles on Electrowetting-Based Digital Microfluidics

Micromachines ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1423
Author(s):  
Zhen Gu ◽  
Jing-Jing Luo ◽  
Le-Wei Ding ◽  
Bing-Yong Yan ◽  
Jia-Le Zhou ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Low Cost ◽  
Digital Microfluidics ◽  
High Sensitivity ◽  
Bulk Solution ◽  
Label Free ◽  
Colorimetric Sensing ◽  
Wide Range ◽  
The Stability ◽  
Digital Microfluidic

Digital microfluidic (DMF) has been a unique tool for manipulating micro-droplets with high flexibility and accuracy. To extend the application of DMF for automatic and in-site detection, it is promising to introduce colorimetric sensing based on gold nanoparticles (AuNPs), which have advantages including high sensitivity, label-free, biocompatibility, and easy surface modification. However, there is still a lack of studies for investigating the movement and stability of AuNPs for in-site detection on the electrowetting-based digital microfluidics. Herein, to demonstrate the ability of DMF for colorimetric sensing with AuNPs, we investigated the electrowetting property of the AuNPs droplets on the hydrophobic interface of the DMF chip and examined the stability of the AuNPs on DMF as well as the influence of evaporation to the colorimetric sensing. As a result, we found that the electrowetting of AuNPs fits to a modified Young–Lippmann equation, which suggests that a higher voltage is required to actuate AuNPs droplets compared with actuating water droplets. Moreover, the stability of AuNPs was maintained during the processing of electrowetting. We also proved that the evaporation of droplets has a limited influence on the detections that last several minutes. Finally, a model experiment for the detection of Hg2+ was carried out with similar results to the detections in bulk solution. The proposed method can be further extended to a wide range of AuNPs-based detection for label-free, automatic, and low-cost detection of small molecules, biomarkers, and metal ions.

Malonamide dithiocarbamate functionalized gold nanoparticles for colorimetric sensing of Cu2+ and Hg2+ ions

RSC Advances ◽  
2015 ◽  
Vol 5 (6) ◽  
pp. 4245-4255 ◽  
Author(s):  
Vaibhavkumar N. Mehta ◽  
Suresh Kumar Kailasa
Keyword(s):  
Gold Nanoparticles ◽  
Colorimetric Detection ◽  
Colorimetric Sensing ◽  
Au Nps ◽  
Colorimetric Probe ◽  
Functionalized Gold Nanoparticles

In this study, a colorimetric probe was developed based on malonamide dithiocarbamate functionalized gold nanoparticles (MA–DTC–Au NPs) for the simultaneous colorimetric detection of Cu2+ and Hg2+ ions.

Colorimetric Sensing of Methyl Parathion Using Nanozymatic Activity of Gold Nanoparticles

2020 ◽  
Vol 12 (2) ◽  
pp. 232-241
Author(s):  
Anjana Pandey ◽  
Saumya Srivastava ◽  
Gayatri ◽  
Priya Rai ◽  
Ashutosh Pandey
Keyword(s):  
Gold Nanoparticles ◽  
Methyl Parathion ◽  
Limit Of Detection ◽  
Colorimetric Assay ◽  
Cost Effective ◽  
Colorimetric Sensing ◽  
Electron Transfer Mechanism ◽  
Au Nps ◽  
New Approach ◽  
Cost Effective Technique

In this study, we have used new approach for detection of the methyl parathion residues i.e., by inhibiting half of the peroxidase-like activity of gold nanoparticles. We have investigated the peroxidase like activity of gold nanoparticles by colorimetric assay and optimized the pH, temperature, incubation time and different concentrations of H2O2 by using TMB as substrate as well as organophosphates effect on their enzyme mimetic activity. Kinetic study of gold nanoparticles has shown better catalytic activity than horseradish peroxidase at pH 3.5. The peroxidase substrate TMB (3,3,5,5-tetramethylbenzidine) can be oxidized by H2O2 by the enzymatic action of the gold nanoparticles resulting in a blue-coloured product, oxidized TMB. The principle involved behind the inhibition of enzymatic activity of nanozyme is due to hindrance of electron transfer mechanism TMB-H2O2-Au NPs system by the methyl parathion. The peroxidase activity is selectively reduced with increasing methyl parathion concentration. This sensing method has lowest limit of detection of 78.95 nM. This study can be used for development of sensitive and cost effective technique for sensing of harmful pesticides.

A molecular assembly of piperidine carboxylic acid dithiocarbamate on gold nanoparticles for the selective and sensitive detection of Al3+ion in water samples

RSC Advances ◽  
2015 ◽  
Vol 5 (42) ◽  
pp. 33468-33477 ◽  
Author(s):  
Vaibhavkumar N. Mehta ◽  
Rakesh Kumar Singhal ◽  
Suresh Kumar Kailasa
Keyword(s):  
Gold Nanoparticles ◽  
Carboxylic Acid ◽  
Water Samples ◽  
Molecular Assembly ◽  
Sensitive Detection ◽  
Colorimetric Sensing ◽  
Schematic Representation ◽  
Au Nps

Schematic representation for the colorimetric sensing of Al3+ion using PCA-DTC-Au NPs as a probe.

An unusual red-to-brown colorimetric sensing method for ultrasensitive silver(i) ion detection based on a non-aggregation of hyperbranched polyethylenimine derivative stabilized gold nanoparticles

The Analyst ◽  
2015 ◽  
Vol 140 (15) ◽  
pp. 5335-5343 ◽  
Author(s):  
Yi Liu ◽  
Yang Liu ◽  
Zhongfa Li ◽  
Junshen Liu ◽  
Li Xu ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Colorimetric Assay ◽  
High Sensitivity ◽  
Ion Detection ◽  
Colorimetric Sensing ◽  
Sensitivity And Selectivity

An unusual red-to-brown colorimetric assay for Ag+based on the anti-aggregation of AuNPs showed high sensitivity and selectivity.

scholarly journals Visual detection of glucose using triangular silver nanoplates and gold nanoparticles

RSC Advances ◽  
2017 ◽  
Vol 7 (46) ◽  
pp. 29122-29128 ◽  
Author(s):  
Tuanjie Cai ◽  
Yan Gao ◽  
Jilin Yan ◽  
Ying Wu ◽  
Junwei Di
Keyword(s):  
Gold Nanoparticles ◽  
Visual Detection ◽  
Spectrophotometric Detection ◽  
Au Nps ◽  
Silver Nanoplates ◽  
Triangular Silver Nanoplates

A sensitive spectrophotometric detection of glucose based on triangular silver nanoplates (Ag TNPs) coupled with gold nanoparticles (Au NPs) was carried out.

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