A target-induced and equipment-free biosensor for amplified visual detection of pesticide acetamiprid with high sensitivity and selectivity

2019 ◽  
Vol 11 (9) ◽  
pp. 1168-1173 ◽  
Author(s):  
Lingwen Zeng ◽  
Danhua Zhou ◽  
Jinghua Wu ◽  
Chengshuai Liu ◽  
Junhua Chen
Keyword(s):  
Visual Detection ◽  
High Sensitivity ◽  
Naked Eye ◽  
G Quadruplex ◽  
Sensitivity And Selectivity

An equipment-free and naked-eye biosensor was developed for amplified detection of pesticide acetamiprid using G-quadruplex as the signal reporter.

scholarly journals Portable smartphone-integrated paper sensors for fluorescence detection of As(III) in groundwater

2020 ◽  
Vol 7 (12) ◽  
pp. 201500
Author(s):  
Sha Liu ◽  
Yong Li ◽  
Chao Yang ◽  
Liqiang Lu ◽  
Yulun Nie ◽  
...  
Keyword(s):  
Environmental Problem ◽  
Visual Detection ◽  
High Sensitivity ◽  
Integration System ◽  
Detection Range ◽  
Sensitivity And Selectivity ◽  
Toxic Metalloid ◽  
Interfering Ions ◽  
Cu Nanoclusters

Arsenic contamination in groundwater is a supreme environmental problem, and levels of this toxic metalloid must be strictly monitored by a portable, sensitive and selective analytical device. Herein, a new system of smartphone-integrated paper sensors with Cu nanoclusters was established for the effective detection of As(III) in groundwater. For the integration system, the fluorescence emissive peak of Cu nanoclusters at 600 nm decreased gradually with increasing As(III) addition. Meanwhile, the fluorescence colour also changed from orange to colourless, and the detection limit was determined as 2.93 nM (0.22 ppb) in a wide detection range. The interfering ions also cannot influence the detection selectivity of As(III). Furthermore, the portable paper sensors based on Cu nanoclusters were fabricated for visual detection of As(III) in groundwater. The quantitative determination of As(III) in natural groundwater has also been accomplished with the aid of a common smartphone. Our work has provided a portable and on-site detection technique toward As(III) in groundwater with high sensitivity and selectivity.

A new on-fluorescent sensor for Ag+ based on benzimidazole bearing bis(ethoxycarbonylmethyl)amino groups

2015 ◽  
Vol 21 (4) ◽  
pp. 211-214 ◽  
Author(s):  
Bing Zhao ◽  
Yue Fang ◽  
Ming-jie Ma ◽  
Qi-Gang Deng ◽  
Yu Xu ◽  
...  
Keyword(s):  
Metal Ions ◽  
Visual Detection ◽  
Fluorescent Sensor ◽  
Amino Groups ◽  
Fluorescent Intensity ◽  
Naked Eye ◽  
Wide Range ◽  
Fluorescent Response ◽  
Sensitivity And Selectivity

AbstractA new fluorescent sensor based on a benzimidazole unit bearing bis(ethoxycarbonylmethyl)amino groups was designed and synthesized. The ligand exhibits strong sensitivity and selectivity for Ag+ by enhanced fluorescent intensity in the presence of a wide range of other tested metal ions in methanol. The colorimetric and fluorescent response to Ag+ can be conveniently detected even by the naked eye, which offers a facile method for visual detection of Ag+.

scholarly journals Hydrogen-Bonded Colorimetric and Fluorescence Chemosensor for Fluoride Anion With High Selectivity and Sensitivity: A Review

2021 ◽  
Vol 9 ◽  
Author(s):  
Zhifeng Deng ◽  
Cheng Wang ◽  
Haichang Zhang ◽  
Taotao Ai ◽  
Kaichang Kou
Keyword(s):  
High Sensitivity ◽  
Fluoride Anion ◽  
Potential Hazard ◽  
Eye Detection ◽  
Extraction Ability ◽  
Hydrogen Bond Interaction ◽  
Naked Eye ◽  
Surrounding Environment ◽  
Sensitivity And Selectivity ◽  
Naked Eye Detection

In recent years, the wide application of fluoride materials has grown rapidly, therefore excessive discharge in the surrounding environment, especially in drinking water and organic effluent, has become a potential hazard to humans, and has even resulted in fluorosis disease. The development of a highly effective and convenient method to recognize fluoride anions in surrounding environments seems necessary and urgent. Among which, the development of a colorimetric and fluorescence fluoride chemosensor with obvious color changing allowing for naked-eye detection with high sensitivity and selectivity is more interesting and challenging. In this minireview, current novel colorimetric and fluorescence chemosensors for fluoride anions by hydrogen-bond interaction are introduced, including obvious color changing by naked-eye detection, high sensitivity and selectivity, non-pollution and fluoride extraction ability, aqueous detection, and other additional functions. Finally, the perspective of the fluoride chemosensor design concept and potential evolution trends are pointed out.

Autocatalytic DNA circuit for Hg2+ detection with high sensitivity and selectivity based on exonuclease III and G-quadruplex DNAzyme

Talanta ◽  
2020 ◽  
Vol 207 ◽  
pp. 120258 ◽  
Author(s):  
Danhua Zhou ◽  
Lingwen Zeng ◽  
Jiafeng Pan ◽  
Qiong Li ◽  
Junhua Chen
Keyword(s):  
High Sensitivity ◽  
Exonuclease Iii ◽  
G Quadruplex ◽  
Sensitivity And Selectivity

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.

Coupling a novel spiro-rhodamine B lactam derivative to Fe3O4 nanoparticles for visual detection of free copper ions with high sensitivity and specificity

RSC Advances ◽  
2015 ◽  
Vol 5 (57) ◽  
pp. 45847-45852 ◽  
Author(s):  
Hongyan Zhang ◽  
Xiaoxue Zeng ◽  
Danlong Chen ◽  
Ying Guo ◽  
Wenjing Jiang ◽  
...  
Keyword(s):  
Sensitivity And Specificity ◽  
Rhodamine B ◽  
Fe3o4 Nanoparticles ◽  
Visual Detection ◽  
Copper Ions ◽  
Tap Water ◽  
High Sensitivity ◽  
Visual Sensor ◽  
Naked Eye

A novel spiro-rhodamine B lactam derivative, which can be coupled to Fe3O4 NPs and act as a Cu2+-selective visual sensor is reported. It can be used to directly detect as little as 50 nM of Cu2+ in river or tap water by only naked-eye observation.

Chemiluminescence detection of lead (II) using ‘8–17’ DNAzyme and hemin/G-quadruplex with high sensitivity and selectivity

2014 ◽  
Vol 201 ◽  
pp. 496-502 ◽  
Author(s):  
Zi-Ming Zhou ◽  
Yong Yu ◽  
Ming-Zhen Zhang ◽  
Jun Chen ◽  
Qiong-Qiong Ren ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Chemiluminescence Detection ◽  
G Quadruplex ◽  
Sensitivity And Selectivity

A T-shaped triazatruxene probe for the naked-eye detection of HCl gas with high sensitivity and selectivity

2016 ◽  
Vol 52 (13) ◽  
pp. 2748-2751 ◽  
Author(s):  
Xiang-Chun Li ◽  
Chun-Yu Wang ◽  
Yi Wan ◽  
Wen-Yong Lai ◽  
Li Zhao ◽  
...  
Keyword(s):  
Schiff Base ◽  
High Sensitivity ◽  
Eye Detection ◽  
Naked Eye ◽  
Sensitivity And Selectivity ◽  
Hcl Gas ◽  
Naked Eye Detection

A T-shaped Schiff-base triazatruxene derivative (TATNFF) was designed, synthesized, and explored as a sensitive probe to detect HCl gas by the naked eye.

scholarly journals Recent Advances in Sensing Applications of Molecularly Imprinted Photonic Crystals

2021 ◽  
Vol 9 ◽  
Author(s):  
Jing Fan ◽  
Lili Qiu ◽  
Yu Qiao ◽  
Min Xue ◽  
Xiao Dong ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
High Sensitivity ◽  
Molecularly Imprinted ◽  
Naked Eye ◽  
Sensing Applications ◽  
Recent Advances ◽  
Molecular Imprinting Technology ◽  
Sensitivity And Selectivity ◽  
Target Molecules ◽  
Naked Eye Detection

Photonic crystals (PhCs) with a brightly colored structure are novel materials and are widely used in chemical and biological sensing. Combining PhCs with molecular imprinting technology (MIT), the molecularly imprinted PhC (MIPC) sensors are fabricated, which can specifically recognize the target molecules. Aside from high sensitivity and selectivity, the MIPC sensors could recognize the naked eye detection because of its optical properties. In this review, an overview of recent advances in sensing applications of MIPC sensors including the responsive mechanisms, application in environmental monitoring, and the application to human health were illustrated. The MIPC sensors all responded to the analytes specifically and also showed high sensitivity in real samples, which provided a method to realize the rapid, convenient, naked eye, and real-time detection. Furthermore, the current limitations and potential future directions of MIPC sensors were also discussed.

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