Colorimetric sensing of copper ions based on the anti-aggregation of unmodified silver nanoparticles in the presence of 1,4-dithiothreitol

2015 ◽  
Vol 7 (2) ◽  
pp. 566-572 ◽  
Author(s):  
Yingjie Ye ◽  
Yi Guo ◽  
Yuan Yue ◽  
Hanjing Huang ◽  
Longtao Zhao ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Oxidation Reaction ◽  
Copper Ions ◽  
Colorimetric Method ◽  
Selective Detection ◽  
Colorimetric Sensing ◽  
Catalyzed Oxidation

A colorimetric method for the fast, sensitive and selective detection of Cu2+ions with silver nanoparticles is proposed based on a specific Cu2+-catalyzed oxidation reaction.

scholarly journals Silver Nanoparticles: Green Synthesis, Characterization, and Their Usage in Determination of Mercury Contamination in Seafoods

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Muhammad Ahad Ahmed ◽  
Najmul Hasan ◽  
Shaikh Mohiuddin
Keyword(s):  
Silver Nanoparticles ◽  
Aqueous Solutions ◽  
Ag Nanoparticles ◽  
Colorimetric Method ◽  
Mercury Contamination ◽  
Selective Detection ◽  
Vis Spectroscopy ◽  
Mercuric Ions ◽  
Proportional Relationship

We demonstrate that silver nanoparticles undergo an interaction with Hg2+ found in traces. The PEG-PVP-stabilized Ag nanoparticles were successfully synthesized via a reduction approach and characterized with surface plasmon resonance UV/Vis spectroscopy. By utilizing the redox reaction between Ag nanoparticles and Hg2+, and the resulted decrease in UV/Vis signal, we develop a colorimetric method for detection of Hg2+ ion. A linear and inversely proportional relationship was found between the absorbance intensity of the Ag nanoparticles and the concentration of Hg2+ ion over the range from 10 ppm to 1 ppm at absorption on 411 nm. The detection limit for Hg2+ ions in homogeneous aqueous solutions is estimated to be 1 ppm. This system shows excellent selectivity for Hg2+. The results found have potential implications in the development of new colorimetric sensors for easy and selective detection and monitoring of mercuric ions in aqueous solutions. The proposed method was successfully applied to quantify the amount of mercury in seafood.

Label-free selective detection of ampicillin drug in human urine samples using silver nanoparticles as a colorimetric sensing probe

2017 ◽  
Vol 41 (14) ◽  
pp. 6685-6692 ◽  
Author(s):  
Kamlesh Shrivas ◽  
Jharna Sahu ◽  
Pathik Maji ◽  
Deepak Sinha
Keyword(s):  
Silver Nanoparticles ◽  
Human Urine ◽  
Urine Samples ◽  
Selective Detection ◽  
Label Free ◽  
Colorimetric Sensing ◽  
Human Urine Samples

Stable citrate-capped silver nanoparticles (AgNPs) were developed as a colorimetric sensing probe for selective detection of ampicillin in urine samples.

A Bright Nitrogen-doped-Carbon-Dots based Fluorescent Biosensor for Selective Detection of Copper Ions

2021 ◽  
Vol 5 (1) ◽  
pp. 84-92
Author(s):  
Shuting Chen ◽  
Chaoqun Chen ◽  
Jian Wang ◽  
Fang Luo ◽  
Longhua Guo ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Copper Ions ◽  
Selective Detection ◽  
Nitrogen Doped ◽  
Fluorescent Biosensor ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

Colorimetric sensing of dopamine based on the aggregation of gold nanoparticles induced by copper ions

2012 ◽  
Vol 4 (12) ◽  
pp. 3981 ◽  
Author(s):  
Haichao Su ◽  
Bing Sun ◽  
Lijian Chen ◽  
Zhenning Xu ◽  
Shiyun Ai
Keyword(s):  
Gold Nanoparticles ◽  
Copper Ions ◽  
Colorimetric Sensing

Selective detection of cysteine/cystine using silver nanoparticles

2013 ◽  
Vol 54 (5) ◽  
pp. 427-430 ◽  
Author(s):  
Jeyaraman Athilakshmi ◽  
Manikkavalli Mohan ◽  
Dillip Kumar Chand
Keyword(s):  
Silver Nanoparticles ◽  
Selective Detection

Biomimetic synthesis of needle-like fluorescent calcium phosphate/carbon dot hybrid composites for cell labeling and copper ion detection

2016 ◽  
Vol 45 (18) ◽  
pp. 7665-7671 ◽  
Author(s):  
Shanshan Guo ◽  
Shousi Lu ◽  
Pingxiang Xu ◽  
Yi Ma ◽  
Liang Zhao ◽  
...  
Keyword(s):  
Drinking Water ◽  
Calcium Phosphate ◽  
Copper Ions ◽  
Hybrid Composites ◽  
Copper Ion ◽  
Cell Labeling ◽  
Biomimetic Synthesis ◽  
Selective Detection ◽  
Sodium Carboxymethylcellulose ◽  
Biomimetic Method

We report a biomimetic method to synthesize needle-like calcium phosphate (CaP) using carbon dots (CDs) and sodium carboxymethylcellulose as dual templates. The CaP/CDs were capable of cell labeling and selective detection of copper ions in drinking water.

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