AuNP based selective colorimetric sensor for cysteine at a wide pH range: investigation of capping molecule structure on the colorimetric sensing and catalytic properties

RSC Advances ◽  
2014 ◽  
Vol 4 (35) ◽  
pp. 18467-18472 ◽  
Author(s):  
V. Vinod Kumar ◽  
Savarimuthu Philip Anthony
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Properties ◽  
Colorimetric Sensor ◽  
Colorimetric Sensing ◽  
Molecule Structure ◽  
Wide Ph Range ◽  
Ph Range

Gold nanoparticles (AuNPs) stabilized with different surfactants, SDS, PEG, PVA, PVP, PSS and T-80, were synthesized and explored for cysteine colorimetric sensing and catalytic properties.

Preparation of Highly Stable Oligo(ethylene glycol) Derivatives-Functionalized Gold Nanoparticles and Their Application in LSPR-Based Detection of PSA/ACT Complex

2007 ◽  
Vol 7 (11) ◽  
pp. 3754-3757 ◽  
Author(s):  
Cuong Cao ◽  
Sang Jun Sim
Keyword(s):  
Gold Nanoparticles ◽  
Colloidal Particles ◽  
Sandwich Immunoassay ◽  
Immunoassay Technique ◽  
Gold Nanoparticle Aggregation ◽  
Wide Ph Range ◽  
Complex Detection ◽  
Ethylene Glycol Derivatives ◽  
Ph Range ◽  
First Time

A sandwich immunoassay for PSA/ACT complex detection based on gold nanoparticle aggregation using two probes was developed. The functionalized colloidal gold nanoparticles (AuNPs) showed highly stable not only in the presence of high ionic strength but also in a wide pH range. The functionalized AuNPs were tagged with PSA/ACT complex monoclonal antibody and goat PSA polyclonal antibody and served as the probes to induce aggregation of the colloidal particles. As a result, PSA/ACT complex was detected at concentrations as low as 1 ng/ml. This is the first time that a new aggregation sandwich-immunoassay technique using two gold probes has been used, and the results are generally applicable to other LSPR-based immunoassays.

Green synthesized silver nanoparticles for selective colorimetric sensing of Hg2+ in aqueous solution at wide pH range

The Analyst ◽  
2013 ◽  
Vol 138 (15) ◽  
pp. 4370 ◽  
Author(s):  
Selvan Sukanya Ravi ◽  
Lawrence Rene Christena ◽  
Nagarajan SaiSubramanian ◽  
Savarimuthu Philip Anthony
Keyword(s):  
Aqueous Solution ◽  
Silver Nanoparticles ◽  
Colorimetric Sensing ◽  
Wide Ph Range ◽  
Ph Range ◽  
Green Synthesized Silver Nanoparticles

A smartphone readable colorimetric sensing platform for rapid multiple protein detection

The Analyst ◽  
2017 ◽  
Vol 142 (17) ◽  
pp. 3177-3182 ◽  
Author(s):  
Feiyang Wang ◽  
Yuexiang Lu ◽  
Jiacheng Yang ◽  
Ying Chen ◽  
Wenjie Jing ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Sensor Array ◽  
Point Of Care ◽  
Protein Detection ◽  
Colorimetric Sensor ◽  
Colorimetric Sensing ◽  
Colorimetric Sensor Array ◽  
Sensing Platform ◽  
Multiple Protein

We have developed a very simple colorimetric sensor array by using only unmodified gold nanoparticles and NaCl salt for discrimination of multiple proteins. The inexpensive and convenient sensor array and the ubiquitous smartphone are coupled to achieve an immediate point-of-care diagnosis without additional devices.

scholarly journals Mercaptosuccinic-Acid-Functionalized Gold Nanoparticles for Highly Sensitive Colorimetric Sensing of Fe(III) Ions

Chemosensors ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 290
Author(s):  
Nadezhda S. Komova ◽  
Kseniya V. Serebrennikova ◽  
Anna N. Berlina ◽  
Svetlana M. Pridvorova ◽  
Anatoly V. Zherdev ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Drinking Water ◽  
Detection Limit ◽  
Analytical Signal ◽  
Colorimetric Sensor ◽  
World Health ◽  
Colorimetric Sensing ◽  
Functionalized Gold Nanoparticles ◽  
Mercaptosuccinic Acid ◽  
Highly Sensitive

The development of reliable and highly sensitive methods for heavy metal detection is a critical task for protecting the environment and human health. In this study, a qualitative colorimetric sensor that used mercaptosuccinic-acid-functionalized gold nanoparticles (MSA-AuNPs) to detect trace amounts of Fe(III) ions was developed. MSA-AuNPs were prepared using a one-step reaction, where mercaptosuccinic acid (MSA) was used for both stabilization, which was provided by the presence of two carboxyl groups, and functionalization of the gold nanoparticle (AuNP) surface. The chelating properties of MSA in the presence of Fe(III) ions and the concentration-dependent aggregation of AuNPs showed the effectiveness of MSA-AuNPs as a sensing probe with the use of an absorbance ratio of A530/A650 as an analytical signal in the developed qualitative assay. Furthermore, the obvious Fe(III)-dependent change in the color of the MSA-AuNP solution from red to gray-blue made it possible to visually assess the metal content in a concentration above the detection limit with an assay time of less than 1 min. The detection limit that was achieved (23 ng/mL) using the proposed colorimetric sensor is more than 10 times lower than the maximum allowable concentration for drinking water defined by the World Health Organization (WHO). The MSA-AuNPs were successfully applied for Fe(III) determination in tap, spring, and drinking water, with a recovery range from 89.6 to 126%. Thus, the practicality of the MSA-AuNP-based sensor and its potential for detecting Fe(III) in real water samples were confirmed by the rapidity of testing and its high sensitivity and selectivity in the presence of competing metal ions.

scholarly journals Colorimetric sensing strategy for heparin assay based on PDDA-induced aggregation of gold nanoparticles

2019 ◽  
Vol 1 (2) ◽  
pp. 486-489 ◽  
Author(s):  
Xiaoyi Ma ◽  
Xinyue Kou ◽  
Yuanyuan Xu ◽  
Dawei Yang ◽  
Peng Miao
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Colorimetric Sensor ◽  
Colloidal System ◽  
Colorimetric Sensing ◽  
Aggregation Effect ◽  
System P ◽  
Highly Sensitive ◽  
Induced Aggregation

We have developed a highly sensitive colorimetric sensor for the detection of heparin based on its anti-aggregation effect of the PDDA–gold nanoparticle colloidal system.

Peroxidase-like activity of gold nanoparticles stabilized by hyperbranched polyglycidol derivatives over a wide pH range

2015 ◽  
Vol 26 (49) ◽  
pp. 495101 ◽  
Author(s):  
Marcin Drozd ◽  
Mariusz Pietrzak ◽  
Paweł Parzuchowski ◽  
Marta Mazurkiewicz-Pawlicka ◽  
Elżbieta Malinowska
Keyword(s):  
Gold Nanoparticles ◽  
Wide Ph Range ◽  
Ph Range

Preparation of Highly Stable Oligo(ethylene glycol) Derivatives-Functionalized Gold Nanoparticles and Their Application in LSPR-Based Detection of PSA/ACT Complex

2007 ◽  
Vol 7 (11) ◽  
pp. 3754-3757 ◽  
Author(s):  
Cuong Cao ◽  
Sang Jun Sim
Keyword(s):  
Gold Nanoparticles ◽  
Colloidal Particles ◽  
Sandwich Immunoassay ◽  
Immunoassay Technique ◽  
Gold Nanoparticle Aggregation ◽  
Wide Ph Range ◽  
Complex Detection ◽  
Ethylene Glycol Derivatives ◽  
Ph Range ◽  
First Time

A sandwich immunoassay for PSA/ACT complex detection based on gold nanoparticle aggregation using two probes was developed. The functionalized colloidal gold nanoparticles (AuNPs) showed highly stable not only in the presence of high ionic strength but also in a wide pH range. The functionalized AuNPs were tagged with PSA/ACT complex monoclonal antibody and goat PSA polyclonal antibody and served as the probes to induce aggregation of the colloidal particles. As a result, PSA/ACT complex was detected at concentrations as low as 1 ng/ml. This is the first time that a new aggregation sandwich-immunoassay technique using two gold probes has been used, and the results are generally applicable to other LSPR-based immunoassays.

Polarographic and spectrophotometric behaviour of some N-p-phenyl substituted benzamidines

1991 ◽  
Vol 56 (12) ◽  
pp. 2791-2799 ◽  
Author(s):  
Juan A. Squella ◽  
Luis J. Nuñez-Vergara ◽  
Hernan Rodríguez ◽  
Amelia Márquez ◽  
Jose M. Rodríguez-Mellado ◽  
...  
Keyword(s):  
Spectrophotometric Study ◽  
Absorption Bands ◽  
Electrochemical Parameters ◽  
Wide Ph Range ◽  
Group A ◽  
Substituent Constants ◽  
Ph Range ◽  
The Waves

Five N-p-phenyl substituted benzamidines were studied by DC and DP polarography in a wide pH range. Coulometric results show that the overall processes are four-electron reductions. Logarithmic analysis of the waves indicate that the process are irreversible. The influence of the pH on the polarographic parameters was also studied. A UV spectrophotometric study was performed in the pH range 2-13. In basic media some variations in the absorption bands were observed due to the dissociation of the amidine group. A determination of the pK values was made by deconvolution of the spectra. Correlations of both the electrochemical parameters and spectrophotometric pK values with the Hammett substituent constants were obtained.

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