scholarly journals A Fluorescent Detection for Paraquat Based on β-CDs-Enhanced Fluorescent Gold Nanoclusters

Foods ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1178
Author(s):  
Hong-Xin Ren ◽  
Min-Xin Mao ◽  
Min Li ◽  
Cun-Zheng Zhang ◽  
Chi-Fang Peng ◽  
...  
Keyword(s):  
Fluorescence Intensity ◽  
Linear Response ◽  
High Selectivity ◽  
Gold Nanoclusters ◽  
Fluorescent Sensors ◽  
Fluorescent Detection ◽  
Tetraacetic Acid ◽  
Host Molecule ◽  
Fluorescent Sensing ◽  
Fluorescent Method

In this report, a fluorescent sensing method for paraquat based on gold nanoclusters (AuNCs) is proposed. It was found that paraquat could quench both glutathione-capped AuNCs (GSH-AuNCs) and β-cyclodextrin-modified GSH-AuNCs (GSH/β-CDs-AuNCs). The modification of β-CDs on the surface of GSH-AuNCs obviously enhanced the fluorescence intensity of GSH-AuNCs and improved the sensitivity of paraquat sensing more than 4-fold. This sensibilization was ascribed to the obvious fluorescence intensity enhancement of GSH-AuNCs by β-CDs and the “host–guest” interaction between paraquat and β-CDs. The fluorescence quenching was mainly due to the photoinduced energy transfer (PET) between GSH/β-CDs-AuNCs and paraquat. With the optimized β-CDs modification of the GSH-AuNC surfaces and under buffer conditions, the fluorescent detection for paraquat demonstrated a linear response in the range of 5.0–350 ng/mL with a detection limit of 1.2 ng/mL. The fluorescent method also showed high selectivity toward common pesticides. The interference from metal ions could be easily masked by ethylene diamine tetraacetic acid (EDTA). This method was applied to the measurement of paraquat-spiked water samples and good recoveries (93.6–103.8%) were obtained. The above results indicate that host molecule modification of fluorescent metal NC surfaces has high potential in the development of robust fluorescent sensors.

Through space charge-transfer emission in lambda (Λ)-shaped triarylboranes and the use in fluorescent sensing for fluoride and cyanide ions

RSC Advances ◽  
2015 ◽  
Vol 5 (57) ◽  
pp. 45668-45678 ◽  
Author(s):  
He Xi ◽  
Yang Liu ◽  
Chun-Xue Yuan ◽  
Ye-Xin Li ◽  
Lei Wang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Space Charge ◽  
Fluorescent Sensors ◽  
Organoboron Compounds ◽  
Fluorescent Sensing ◽  
Efficient Strategy ◽  
New Class

By introducing a twisted and non-conjugated Λ-shaped TB scaffold to triarylboranes, we provide an efficient strategy to develop a new class of organoboron compounds applied as colorimetric and ratiometric fluorescent sensors for fluoride and cyanide.

Two Schiff base ligands for distinguishing ZnII/CdII sensing—effect of substituent on fluorescent sensing

RSC Advances ◽  
2015 ◽  
Vol 5 (35) ◽  
pp. 27682-27689 ◽  
Author(s):  
Zhi-Peng Zheng ◽  
Qin Wei ◽  
Wen-Xia Yin ◽  
Lin-Tao Wan ◽  
Xia Huang ◽  
...  
Keyword(s):  
Schiff Base ◽  
Fluorescent Sensors ◽  
Schiff Base Ligands ◽  
Fluorescent Sensing ◽  
Ethoxyl Group

Two Schiff base ligands (HL1, HL2) were synthesized as fluorescent sensors for Zn2+ or Cd2+. With an ethoxyl group, HL1 can distinguishingly sense Zn2+ and Cd2+, while HL2 exclusively responds to Zn2+.

Gold nanoclusters and fluorescence-based sensing

2017 ◽  
Author(s):  
◽  
Xi Chen
Keyword(s):  
Fluorescence Intensity ◽  
Cholesterol Oxidase ◽  
Gold Nanoclusters ◽  
Green Emission ◽  
Mapping Method ◽  
Metal Nanoclusters ◽  
Molecular Rotor ◽  
Great Resistance ◽  
University Of Missouri ◽  
Thermal Reversibility

[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] The main topic of this dissertation focuses on development of analytical methods, mainly modification and application of metal nanoclusters in fluorescence-based sensing. Based on bovine serum albumin passivated gold nanoclusters (AuNCs@BSA) we firstly developed a fluorescent biosensor platform, combining cholesterol oxidase with assistance of surfactant, for selective detection of water insoluble analyte, cholesterol in aqueous condition. Moreover, we designed a series of modification strategy to enhence thermal reversibility of AuNCs@BSA, aiming at reducing hysteresis remained during thermal cycles. Taking advantage of optimized thermal reversibility in terms of fully recoverable fluorescence intensity, analytical performance of modified AuNCs@BSA was investigated and an aqueous-phase temperature sensor was achieved. In addition to AuNCs, we developed novel glutathione stabilized copper NCs with green-emission in assistance of ascorbic acid reduction, which showed great resistance to nitro compounds. Further, analytical application of as-prepared Cu NCs to ratiometric sensing on explosive molecules, cooperating with AuNCs@BSA, was investigated. In the last, a novel and facile temperature mapping method using ionic liquid and organic fluorescent molecular rotor were described. Making use of viscosity-sensitive fluorescent dye, temperature was converted to ratio value of fluorescence intensity and recorded, enabling visualized thermal map.

Acid-Triggered Self-Assembled Egg White Protein-Coated Gold Nanoclusters for Selective Fluorescent Detection of Fe3+, NO2–, and Cysteine

2020 ◽  
Vol 3 (12) ◽  
pp. 11838-11849
Author(s):  
Wenyan Li ◽  
Xiangping Wen ◽  
Hemiao Zhao ◽  
Wenjun Yan ◽  
John F. Trant ◽  
...  
Keyword(s):  
Gold Nanoclusters ◽  
Egg White ◽  
Fluorescent Detection ◽  
Egg White Protein ◽  
Self Assembled

What has fluorescent sensing told us about copper and brain malfunction?

Metallomics ◽  
2015 ◽  
Vol 7 (1) ◽  
pp. 56-65 ◽  
Author(s):  
Clara Shen ◽  
Elizabeth J. New
Keyword(s):  
Fluorescent Sensors ◽  
Fluorescent Sensing ◽  
The Brain

Here we review the development and application of fluorescent sensors for studying copper in the brain.

Gold nanoclusters-based dual-channel assay for colorimetric and turn-on fluorescent sensing of alkaline phosphatase

2019 ◽  
Vol 301 ◽  
pp. 127080 ◽  
Author(s):  
Pengjuan Ni ◽  
Chuanxia Chen ◽  
Yuanyuan Jiang ◽  
Chenghui Zhang ◽  
Bo Wang ◽  
...  
Keyword(s):  
Alkaline Phosphatase ◽  
Gold Nanoclusters ◽  
Fluorescent Sensing ◽  
Turn On ◽  
Dual Channel

scholarly journals A bifunctional sensor based on diarylethene for the colorimetric recognition of Cu2+ and fluorescence detection of Cd2+

RSC Advances ◽  
2019 ◽  
Vol 9 (50) ◽  
pp. 29141-29148 ◽  
Author(s):  
Shouyu Qiu ◽  
Mengmeng Lu ◽  
Shiqiang Cui ◽  
Zhen Wang ◽  
Shouzhi Pu
Keyword(s):  
Fluorescence Detection ◽  
Water Samples ◽  
High Selectivity ◽  
High Accuracy ◽  
Fluorescent Detection

A bifunctional sensor for colorimetric recognition of Cu2+ and fluorescent detection of Cd2+ was synthesized. It not only showed high selectivity and sensitivity to Cu2+ and Cd2+, but also could be used in practical water samples with high accuracy.

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