Chromogenic naked-eye detection of copper ion and fluoride

RSC Advances ◽  
2015 ◽  
Vol 5 (105) ◽  
pp. 86463-86472 ◽  
Author(s):  
Ye Won Choi ◽  
Jae Jun Lee ◽  
Ga Rim You ◽  
Sun Young Lee ◽  
Cheal Kim
Keyword(s):  
Color Change ◽  
Copper Ion ◽  
Eye Detection ◽  
Naked Eye ◽  
Colorimetric Chemosensor ◽  
Naked Eye Detection

Colorimetric chemosensor was reported for detection of Cu2+ and F−via the color change from colorless to yellow and to orange.

Naked-Eye Detection of Mercury Ions from Morphological Transition of Silver Nanocubes: Tuning Sensitivity Using Co-Staining Agent

2021 ◽  
Vol 21 (4) ◽  
pp. 2123-2131
Author(s):  
Alagan Jeevika ◽  
Dhesingh Ravi Shankaran
Keyword(s):  
Color Change ◽  
Limit Of Detection ◽  
Low Cost ◽  
Toxic Metal ◽  
Face Centered Cubic ◽  
Mercury Ions ◽  
Eye Detection ◽  
Naked Eye ◽  
Silver Nanocubes ◽  
Naked Eye Detection

A simple, low-cost and highly selective nanosensor was developed for naked-eye detection of mercury ions (Hg2+) based on Eosin/silver nanocubes (Eosin/AgNCbs). Silver nanocubes (AgNCbs) were synthesized by polyol assisted chemical method. HR-TEM result shows the formed AgNCbs have a mean diameter of 84±0.005 nM (diagonally measured) and edge length of 55±0.01 nM. XRD result confirms that the AgNCbs are single crystalline in nature with a phase structure of face centered cubic (FCC) of silver. On interaction of Hg2+, AgNCbs exhibits a color change from gray to black up to 16.67 μM of Hg2+ owed to the formation of solid like bimetallic complex of Ag/Hg amalgam. The selectivity of AgNCbs was evaluated with several other toxic metal ions including, Mg2+, Ba2+, Ca4+, Pb2+, Cd4+, Zn2+, Co2+, Cu2+, K+ and Ni2+ and found good selectivity towards Hg2+. The sensitivity of the AgNCbs sensor system was tuned by using Eosin as a co-staining agent. The Eosin/AgNCbs showed a limit of detection of 60±0.050 nM with the color change from orange to purple. The results suggests that the Eosin/AgNCbs nanosensor exhibits good selectivity, sensitivity, repeatability and rapid response, which could be explored for real-time detection of Hg2+ in environmental and biological samples.

Colorimetric chemosensor based on coumarin skeleton for selective naked eye detection of cobalt (II) ion in near aqueous medium

2019 ◽  
Vol 280 ◽  
pp. 219-226 ◽  
Author(s):  
Devika Vashisht ◽  
Kamaljot Kaur ◽  
Rashmi Jukaria ◽  
Aseem Vashisht ◽  
Shweta Sharma ◽  
...  
Keyword(s):  
Aqueous Medium ◽  
Eye Detection ◽  
Naked Eye ◽  
Colorimetric Chemosensor ◽  
Naked Eye Detection

A new hydrazone-based colorimetric chemosensor for naked-eye detection of copper ion in aqueous medium

2019 ◽  
Vol 43 (9-10) ◽  
pp. 426-430
Author(s):  
Shao-Min Shi ◽  
Qiao Li ◽  
Sheng-Li Hu
Keyword(s):  
Metal Ions ◽  
Copper Ion ◽  
Colour Change ◽  
Selective Recognition ◽  
X Ray Diffraction ◽  
Binding Properties ◽  
X Ray ◽  
Naked Eye ◽  
Colorimetric Chemosensor ◽  
Naked Eye Detection

A new hydrazone-based colorimetric Cu2+ chemosensor is synthesized. Its structure was confirmed by single-crystal X-ray diffraction. Its binding properties towards various metal ions are examined through absorption spectroscopy. In aqueous THF solution, the chemosensor exhibits selective recognition towards Cu2+ over other metal ions with a colour change from colourless to pink. The complex formed between the chemosensor and Cu2+ ions forms a 2:1 stoichiometry with an association constant of 2.46 × 108M−2. The analytical detection limit for Cu2+ by the naked eye is as low as 10.0 μM.

Non-enzymatic colorimetric sensor strip based on melamine-functionalized gold nanoparticles assembled on polyamide nanofiber membranes for the detection of metronidazole

2019 ◽  
Vol 11 (29) ◽  
pp. 3706-3713 ◽  
Author(s):  
Mohammed Awad Abedalwafa ◽  
Yan Li ◽  
Chunfang Ni ◽  
Gang Yang ◽  
Lu Wang
Keyword(s):  
Gold Nanoparticles ◽  
Color Change ◽  
High Sensitivity ◽  
Colorimetric Sensor ◽  
Eye Detection ◽  
Naked Eye ◽  
Functionalized Gold Nanoparticles ◽  
Sensitivity And Selectivity ◽  
Nanofiber Membranes ◽  
Naked Eye Detection

Non-enzymatic colorimetric sensor strip for detection of metronidazole (MTZ) was designed and constructed, with high sensitivity and selectivity. Which can be used for naked-eye detection of MTZ with a visible color change from pink to purple.

A Simple Colorimetric Chemosensor for Naked Eye Detection of Cyanide Ion

2016 ◽  
Vol 26 (5) ◽  
pp. 1857-1864 ◽  
Author(s):  
Parisa Gholamzadeh ◽  
Ghodsi Mohammadi Ziarani ◽  
Negar Lashgari ◽  
Alireza Badiei ◽  
Alireza Shayesteh ◽  
...  
Keyword(s):  
Eye Detection ◽  
Cyanide Ion ◽  
Naked Eye ◽  
Colorimetric Chemosensor ◽  
Naked Eye Detection

Water-soluble pyridine-based colorimetric chemosensor for naked eye detection of silver ions: design, synthesis, spectral and theoretical investigation

2014 ◽  
Vol 6 (24) ◽  
pp. 9610-9615 ◽  
Author(s):  
B. Annaraj ◽  
M. A. Neelakantan
Keyword(s):  
Water Samples ◽  
Silver Ions ◽  
Cost Effective ◽  
Water Soluble ◽  
Eye Detection ◽  
Design Synthesis ◽  
Naked Eye ◽  
Colorimetric Chemosensor ◽  
Test Kit ◽  
Naked Eye Detection

A selective and sensitive colorimetric chemosensor (L) for silver ions is reported. Various spectroscopic results show the sensing properties of (L). A simple and cost effective test kit has been prepared for the detection of silver ion in water samples.

scholarly journals A Gold Growth-Based Plasmonic ELISA for the Sensitive Detection of Fumonisin B1 in Maize

Toxins ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 323 ◽  
Author(s):  
Shengnan Zhan ◽  
Lingyan Zheng ◽  
Yaofeng Zhou ◽  
Kesheng Wu ◽  
Hong Duan ◽  
...  
Keyword(s):  
Horseradish Peroxidase ◽  
Color Change ◽  
Fumonisin B1 ◽  
High Sensitivity ◽  
Enzyme Linked Immunosorbent Assay ◽  
Eye Detection ◽  
Naked Eye ◽  
Accuracy And Precision ◽  
Conventional Elisa ◽  
Naked Eye Detection

In this paper, a highly sensitive plasmonic enzyme-linked immunosorbent assay (pELISA) was developed for the naked-eye detection of fumonisin B1 (FB1). Glucose oxidase (GOx) was used as an alternative to horseradish peroxidase as the carrier of the competing antigen. GOx catalyzed the oxidation of glucose to produce hydrogen peroxide, which acted as a reducing agent to reduce Au3+ to Au on the surface of gold seeds (5 nm), This reaction led to a color change in the solution from colorless to purple, which was observable to the naked eye. Various parameters that could influence the detection performance of pELISA were investigated. The developed method exhibited a considerably high sensitivity for FB1 qualitative naked-eye detection, with a visible cut-off limit of 1.25 ng/mL. Moreover, the proposed pELISA showed a good linear range of 0.31–10 ng/mL with a half maximal inhibitory concentration (IC50) of 1.86 ng/mL, which was approximately 13-fold lower than that of a horseradish peroxidase- (HRP)-based conventional ELISA. Meanwhile, the proposed method was highly specific and accurate. In summary, the new pELISA exhibited acceptable accuracy and precision for sensitive naked-eye detection of FB1 in maize samples and can be applied for the detection of other chemical contaminants.

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