scholarly journals Development of an Optical Sensing Strategy Based on Gold Nanoparticles Formation Driven by Polyphenols. Application to Food Samples

2015 ◽  
pp. 39-46
Author(s):  
Flavio Della Pelle ◽  
Dario Compagnone ◽  
Michele Del Carlo ◽  
Diana Vilela ◽  
María Cristina González ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Optical Sensing ◽  
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.

Novel synthesis of polycationic gold nanoparticles and their potential for microbial optical sensing

Gold Bulletin ◽  
2020 ◽  
Vol 53 (3-4) ◽  
pp. 135-140
Author(s):  
Ravichandran Manisekaran ◽  
Edgar Jiménez-Cervantes Amieva ◽  
Carlos M. Valdemar-Aguilar ◽  
Luz M. López-Marín
Keyword(s):  
Gold Nanoparticles ◽  
Optical Sensing ◽  
Novel Synthesis

Gold nanoparticles-based colorimetric assay for rapid detection of Salmonella species in food samples

2011 ◽  
Vol 27 (9) ◽  
pp. 2227-2230 ◽  
Author(s):  
Dinesh Prasad ◽  
Shankaracharya ◽  
Ambarish Sharan Vidyarthi
Keyword(s):  
Gold Nanoparticles ◽  
Rapid Detection ◽  
Colorimetric Assay ◽  
Food Samples

Gold nanoparticles-functionalized microorganisms assisted construction of immunobiosensor for sensitive detection of ochratoxin A in food samples

2019 ◽  
Vol 299 ◽  
pp. 126969 ◽  
Author(s):  
Tong Bu ◽  
Meng Zhang ◽  
Xinyu Sun ◽  
Yongming Tian ◽  
Feier Bai ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Ochratoxin A ◽  
Food Samples ◽  
Sensitive Detection

scholarly journals Detection of xanthine in food samples with an electrochemical biosensor based on PEDOT:PSS and functionalized gold nanoparticles

RSC Advances ◽  
2020 ◽  
Vol 10 (59) ◽  
pp. 36147-36154
Author(s):  
M. Z. H. Khan ◽  
M. S. Ahommed ◽  
M. Daizy
Keyword(s):  
Gold Nanoparticles ◽  
Glassy Carbon ◽  
Electrochemical Biosensor ◽  
Food Samples ◽  
Sensitive Detection ◽  
Carbon Electrodes ◽  
Polystyrene Sulfonate ◽  
Host Matrix ◽  
Glassy Carbon Electrodes ◽  
Functionalized Gold Nanoparticles

An innovative biosensor with glassy carbon electrodes modified with poly(3,4-ethylenedioxythiophene) polystyrene sulfonate nanocomposites as a host matrix with functionalized gold nanoparticles for the selective and sensitive detection of xanthine.

scholarly journals Gold nanoparticles as sensitive optical probes

The Analyst ◽  
2016 ◽  
Vol 141 (5) ◽  
pp. 1611-1626 ◽  
Author(s):  
Zhiqin Yuan ◽  
Cho-Chun Hu ◽  
Huan-Tsung Chang ◽  
Chao Lu
Keyword(s):  
Gold Nanoparticles ◽  
Optical Sensing ◽  
Optical Probes ◽  
Sensing Systems ◽  
Recent Advances

Recent advances in Au NP based optical sensing systems for various analytes based on absorption, fluorescence and SERS are summarized.

pH-independent optical sensing of heparin based on ionic liquid-capped gold nanoparticles

The Analyst ◽  
2013 ◽  
Vol 138 (17) ◽  
pp. 4830 ◽  
Author(s):  
Bahram Hemmateenejad ◽  
Samira Dorostkar ◽  
Fatemeh Shakerizadeh-Shirazi ◽  
Mojtaba Shamsipur
Keyword(s):  
Gold Nanoparticles ◽  
Ionic Liquid ◽  
Optical Sensing
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