Mean centering of ratio spectra for colorimetric determination of morphine and codeine in pharmaceuticals and biological samples using melamine modified gold nanoparticles

2016 ◽  
Vol 8 (37) ◽  
pp. 6739-6747 ◽  
Author(s):  
Naimeh Mohseni ◽  
Morteza Bahram
Keyword(s):  
Gold Nanoparticles ◽  
Biological Samples ◽  
Colorimetric Determination ◽  
Mean Centering

Ratiometric colorimetric determination of coenzyme A using gold nanoparticles and a binuclear uranyl complex as optical probes

2015 ◽  
Vol 183 (2) ◽  
pp. 715-721 ◽  
Author(s):  
Rurong Wu ◽  
Lifu Liao ◽  
Shijun Li ◽  
Yanyan Yang ◽  
Xilin Xiao ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Coenzyme A ◽  
Uranyl Complex ◽  
Colorimetric Determination ◽  
Optical Probes

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.

Colorimetric determination of cysteine by a paper-based assay system using aspartic acid modified gold nanoparticles

2020 ◽  
Vol 187 (6) ◽  
Author(s):  
Chunye Liu ◽  
Yanqing Miao ◽  
Xuejiao Zhang ◽  
Shuli Zhang ◽  
Xiaojun Zhao
Keyword(s):  
Gold Nanoparticles ◽  
Aspartic Acid ◽  
Assay System ◽  
Colorimetric Determination

Sub-10-nm multicolored gold nanoparticles for colorimetric determination of antibiotics via formation of interlocking rings

2019 ◽  
Vol 186 (12) ◽  
Author(s):  
Yumin Leng ◽  
Yu Fu ◽  
Zhiwen Lu ◽  
Zhipei Sang ◽  
Kecheng Liu ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Colorimetric Determination
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