“Red-to-blue” colorimetric detection of cysteine via anti-etching of silver nanoprisms

Nanoscale ◽  
2014 ◽  
Vol 6 (18) ◽  
pp. 10631-10637 ◽  
Author(s):  
Yonglong Li ◽  
Zihou Li ◽  
Yuexia Gao ◽  
An Gong ◽  
Yujie Zhang ◽  
...  
Keyword(s):  
Colorimetric Detection ◽  
Morphology Transition ◽  
Silver Nanoprisms ◽  
Shape Frozen

A mechanistic scheme of the AgNPR system for Cys detection is presented. In the absence of Cys, I−could attach to the corners and edges of AgNPRsviathe Ag–I bond resulting in the morphology transition from nanoprism to nanodisk. Cys can prevent I−from attaching to the AgNPRs' surface and keep the shape frozen.

Colorimetric detection of catalase and catalase-positive bacteria (E. coli) using silver nanoprisms

2016 ◽  
Vol 8 (36) ◽  
pp. 6625-6630 ◽  
Author(s):  
Lili Zhao ◽  
Julia Wiebe ◽  
Rabia Zahoor ◽  
Sladjana Slavkovic ◽  
Brian Malile ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Catalase Activity ◽  
Colorimetric Detection ◽  
E Coli ◽  
Silver Nanoprisms

The sensitivity of the formation of plasmonic silver nanoprisms to hydrogen peroxide is explored for the colorimetric detection of catalase activity in bacteria.

Colorimetric detection of hypochlorite based on the morphological changes of silver nanoprisms to spherical nanoparticles

2017 ◽  
Vol 9 (21) ◽  
pp. 3151-3158 ◽  
Author(s):  
Thangarasu Sasikumar ◽  
Malaichamy Ilanchelian
Keyword(s):  
Quantitative Determination ◽  
Morphological Changes ◽  
Colorimetric Detection ◽  
Colorimetric Method ◽  
Spherical Nanoparticles ◽  
Colorimetric Probe ◽  
Silver Nanoprisms

In this work, we have developed a simple, rapid, sensitive and selective colorimetric method for the quantitative determination of hypochlorite (ClO−) ions by using triangular silver nanoprisms (AgNPRs) as a colorimetric probe.

Silver Nanoprism for Selective and Sensitive Detection of Hg+2 Ions

2021 ◽  
Vol 21 (12) ◽  
pp. 6094-6100
Author(s):  
Avneesh Mittal ◽  
Komal Gupta ◽  
Balaram Pani ◽  
Gulshan Kumar ◽  
Gopala Ram Bhadu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Surface Plasmon Resonance ◽  
Detection Limit ◽  
Surface Plasmon ◽  
Water Samples ◽  
High Performance ◽  
Colorimetric Detection ◽  
Silver Nanoprisms ◽  
Highly Sensitive ◽  
Varied Concentration

In this article, we propose high-performance colorimetric detection of Hg+2 using silver nanoprisms. The spherical and triangular AgNPs were synthesized using varied concentration of NaBH4. Pristine AgNPs without any further modification were used for the detection of various metal ions including Hg2+, Pb2+, Cl−, Cd2+, Co2+, Cu2+, Ba2+, Pb2+, Cr3+, Cr2O2−7 , Fe2+, Fe3+ etc. AgNPs were not only selective in detecting the ions of Cl− and Hg+2 ions but also highly sensitive. Minimum detection limit was observed to be as low as 10−7 ppm for both Hg+2 and Cl−. Water samples collected from various locations detected for the presence of various heavy metals. Silver nanoprisms owing to their surface plasmon resonance exhibit highly selective tendency towards detection against Hg+2.

Uricase-stimulated etching of silver nanoprisms for highly selective and sensitive colorimetric detection of uric acid in human serum

2015 ◽  
Vol 221 ◽  
pp. 1433-1440 ◽  
Author(s):  
Dong Wu ◽  
Hai-Feng Lu ◽  
He Xie ◽  
Juan Wu ◽  
Cheng-Ming Wang ◽  
...  
Keyword(s):  
Uric Acid ◽  
Human Serum ◽  
Colorimetric Detection ◽  
Silver Nanoprisms

scholarly journals Colorimetric detection of individual biothiols by tailor made reactions with silver nanoprisms

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Pei Li ◽  
Sang Mo Lee ◽  
Hyo Yong Kim ◽  
Soohyun Kim ◽  
Steve Park ◽  
...  
Keyword(s):  
Human Serum ◽  
Colorimetric Detection ◽  
Chloride Ion ◽  
High Sensitivity ◽  
Cost Effective ◽  
Colorimetric Sensing ◽  
Practical Applications ◽  
Silver Nanoprisms ◽  
Sensing Platform ◽  
Sensitivity And Selectivity

AbstractWe herein described a rapid, sensitive, and selective colorimetric sensing platform for biothiols in human serum, which relies on the dual functions of biothiols as anti-etching and aggregating agent for silver nanoprisms (AgNPRs). In principle, the target biothiols that bind to the surface of AgNPRs through Ag–S covalent interactions protect the AgNPRs from being etched by chloride ion (Cl−) in human serum, thus exhibiting the blue/purple color that is indicative of AgNPRs. On the other hand, the color of AgNPRs turned to yellow in the absence of biothiols or the presence of non-sulfur-containing amino acids, indicating the formation of small silver nanoparticles (AgNPs). Importantly, we found that individual biothiols (Hcy, Cys, and GSH) exert not only the anti-etching effect, but also the aggregating effect on AgNPRs, which can be modulated by simply tuning the pH conditions, and this consequently allows for the discriminative detection of each biothiol. Based on this simple and cost-effective strategy, we successfully determined the Hcy, Cys, and GSH in human serum with high sensitivity and selectivity within 10 min, demonstrating the diagnostic capability and potential in practical applications.

scholarly journals Colorimetric Detection of Mercury Ions in Water with Capped Silver Nanoprisms

2019 ◽  
Author(s):  
Fouzia Tanvir ◽  
Atif Yaqub ◽  
Shazia Tanvir ◽  
Ran An ◽  
William A. Anderson
Keyword(s):  
Detection Limit ◽  
Coal Combustion ◽  
Colorimetric Detection ◽  
Industrial Processes ◽  
Rapid Testing ◽  
Mercury Ions ◽  
Reagent Solution ◽  
Testing Methods ◽  
Silver Nanoprisms ◽  
Local Impact

The emission of mercury (II) from coal combustion and other industrial processes continues to be a concern and have local impact on water resources.  The detection of these ions in water with sensitive but rapid testing methods is desirable for environmental screening and fieldwork.  Nanoparticles of various chemistries have shown promise for this purpose, as they can be used in simple colorimetric analyses. Silver nanoprisms were chemically synthesized resulting in a blue reagent solution, that transitioned towards yellow and colorless solutions when exposed to Hg2+ ions at various concentrations. A rapid galvanic reduction of Hg2+ onto the nanoprism surfaces is apparently responsible for a change in shape towards spherical nanoparticles, leading to the change in color. There were no interferences by other metal ions in solution, and pH had minimal effect in the range of 6.5 to 9.8. The silver nanoprism reagent provided a detection limit of approximately 0.5 µM (100 µg/L) for mercury (II), which compares favorably with other nanoparticle-based techniques. Further optimization may reduce this detection limit.

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