A novel colorimetric sensor for naked-eye detection of cysteine and Hg2+ based on “on-off" strategy using Co/Zn-Grafted Mesoporous Silica Nanoparticles

2021 ◽  
Author(s):  
Morvarid Aghayan ◽  
Ali Mahmoudi ◽  
Mohammad Reza Sazegar ◽  
Forogh Adhami
Keyword(s):  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Mesoporous Silica Nanoparticles ◽  
Colorimetric Sensor ◽  
Mercury Ions ◽  
Eye Detection ◽  
Naked Eye ◽  
Sensing Platform ◽  
Naked Eye Detection

In an attempt to explore the significance of inorganic mimetic enzymes as sensors, this study introduces a naked-eye analytical sensing platform for the detection of L-cysteine (cys), mercury ions (Hg2+)...

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.

A smart and sensitive sensing platform to monitor the extracellular concentration of hydrogen peroxide in rat brain microdialysates during pathological processes based on mesoporous silica nanoparticles

2018 ◽  
Vol 10 (36) ◽  
pp. 4361-4366
Author(s):  
Guoyan Xu ◽  
Qunfang Xie ◽  
Zhonghui Chen ◽  
Fang Luo ◽  
Bin Qiu ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Rat Brain ◽  
Chemical Sensing ◽  
Mesoporous Silica Nanoparticles ◽  
Stimuli Responsive ◽  
Extracellular Concentration ◽  
Sensing Platform

An effective and biocompatible H2O2 stimuli-responsive chemical sensing platform has been developed based on mesoporous silica nanoparticles (MSNPs).

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 novel colorimetric sensor based on modified mesoporous silica nanoparticles for rapid on-site detection of nitrite

2020 ◽  
Vol 187 (12) ◽  
Author(s):  
Tarawee Taweekarn ◽  
Worawit Wongniramaikul ◽  
Wadcharawadee Limsakul ◽  
Wilasinee Sriprom ◽  
Chanadda Phawachalotorn ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Mesoporous Silica Nanoparticles ◽  
Colorimetric Sensor

Portable and quantitative monitoring of mercury ions using DNA-gated mesoporous silica nanoparticles using a glucometer readout

2016 ◽  
Vol 52 (10) ◽  
pp. 2192-2194 ◽  
Author(s):  
Xiaoling Liang ◽  
Lin Wang ◽  
Dou Wang ◽  
Lingwen Zeng ◽  
Zhiyuan Fang
Keyword(s):  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Mesoporous Silica Nanoparticles ◽  
Quantitative Detection ◽  
Mercury Ions ◽  
Quantitative Monitoring

A novel glucometer biosensor was developed for the quantitative detection of mercury ions (Hg2+) based on glucose-loaded DNA-gated mesoporous silica nanoparticles (MSNs).

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