l ‐Cysteine modified silver nanoparticles‐based colorimetric sensing for the sensitive determination of Hg 2+ in aqueous solutions

Luminescence ◽  
2020 ◽  
Author(s):  
Pengfei Fan ◽  
Shunzhen He ◽  
Jianlin Cheng ◽  
Congcong Hu ◽  
Can Liu ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Aqueous Solutions ◽  
Colorimetric Sensing ◽  
Sensitive Determination

Studies on fluorescence determination of nanomolar Cr(iii) in aqueous solutions using unmodified silver nanoparticles

2012 ◽  
Vol 4 (10) ◽  
pp. 3407 ◽  
Author(s):  
M. Elavarasi ◽  
Madona L. Paul ◽  
A. Rajeshwari ◽  
N. Chandrasekaran ◽  
A. B. Mandal ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Aqueous Solutions ◽  
Fluorescence Determination

A novel colorimetric immunoassay based on enzyme-regulated instant generation of Turnbull's blue for the sensitive determination of ochratoxin A

The Analyst ◽  
2020 ◽  
Vol 145 (6) ◽  
pp. 2420-2424 ◽  
Author(s):  
Wenqiang Lai ◽  
Jiaqing Guo ◽  
Qingqing Wu ◽  
Yaomin Chen ◽  
Quanying Cai ◽  
...  
Keyword(s):  
Ochratoxin A ◽  
Colorimetric Sensing ◽  
Colorimetric Immunoassay ◽  
Sensitive Determination ◽  
Chromogenic Agent

The aim of this study was to develop a novel colorimetric sensing method based on enzyme-regulated instant generation of Turnbull's blue, serving as a chromogenic agent, for a sensitive immunoassay for the determination of ochratoxin A (OTA).

scholarly journals Colloidal solution of silver nanoparticles for label-free colorimetric sensing of ammonia in aqueous solutions

2018 ◽  
Vol 9 ◽  
pp. 499-507 ◽  
Author(s):  
Alessandro Buccolieri ◽  
Antonio Serra ◽  
Gabriele Giancane ◽  
Daniela Manno
Keyword(s):  
Silver Nanoparticles ◽  
Aqueous Solutions ◽  
Morphological Analysis ◽  
Colloidal Solution ◽  
Ammonia Concentration ◽  
Dependent Manner ◽  
Label Free ◽  
Colorimetric Sensing ◽  
Concentration Dependent Manner ◽  
High Ammonia

Silver nanoparticles were synthesized in the presence of saccharides and ammonia (NH3) in the concentration range from 10−2 to 103 ppm to develop an optical sensor for NH3 in aqueous solutions. Ammonia affects the features of the nanoparticles obtained in a concentration-dependent manner as determined by UV–vis absorption analysis and TEM observations. Structural and morphological analysis provides the basis for the production of a colorimetric label-free sensor for ammonia. Overall, surface plasmon resonance increases when ammonia concentration rises, although the functional trend is not the same over the entire investigated ammonia concentration range. Three different ranges have been identified: very low ammonia concentrations from 0.01 to 0.2 ppm, high ammonia concentrations from 20 to 350 ppm and, most importantly, the intermediate or physiological range of ammonia from 0.5 to 10 ppm.

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