scholarly journals A sensitive fluorescent sensor for highly sensitive detection of trace water in organic solvents based on substituted imidazole

2021 ◽  
Author(s):  
Huiqian Li ◽  
Weijian Xue ◽  
Jinping Wang ◽  
Jie Ma ◽  
Bing Zhao ◽  
...  
Keyword(s):  
Fluorescence Spectra ◽  
Fluorescent Sensor ◽  
Important Change ◽  
Red Shift ◽  
Imidazole Derivative ◽  
Absorption And Fluorescence Spectra ◽  
Highly Sensitive ◽  
Initial Discovery ◽  
Highly Sensitive Detection ◽  
Trace Water

Abstract A novel substituted imidazole derivative 1a with carboxyl and quinoline structure has been designed and synthesized. And our initial discovery is that this compound can effectively detect trace amounts of water in ethanol. And the metal in solution couldn’t affect the absorption and fluorescence Spectra of 1a. With the addition of water, the energy band appears a red-shift from 330nm to 355nm in the absorption spectra. And the emission spectrum undergoes an important change in its fluorescent effect in the presence of water. Furthermore, absorption peak of 1a displays a red-shift with increasing pH from 2.31 to 10.72. All available data (absorption and emission) strongly support the possible mechanism. Due to the pronounced fluorescence changing property, the substituted imidazole derivative 1a could be utilized as fluorescent probes for quantifying trace amount of water in ethanol. Graphic abstract

A phthalocyanine-based fluorescent sensor for Zn2+ ion

2013 ◽  
Vol 17 (01n02) ◽  
pp. 99-103 ◽  
Author(s):  
Hui He ◽  
Jian-Yong Liu ◽  
Dennis K.P. Ng
Keyword(s):  
Metal Ions ◽  
Spectral Properties ◽  
Fluorescence Spectra ◽  
Near Infrared ◽  
Fluorescent Sensor ◽  
High Sensitivity ◽  
Absorption And Fluorescence Spectra

This paper describes the preparation and spectral properties of a near-infrared fluorophore in which two bis(2-picolyl)amino moieties are axially linked to a silicon(IV) phthalocyanine core. The effects of various metal ions on its absorption and fluorescence spectra have been examined. The results indicate that this compound shows a high sensitivity and moderate selectivity toward Zn2+ ion.

scholarly journals Impact of Solvents, Magnesium Oxide and Aluminium Oxide Nanoparticles on the Photophysical Properties of Acridine Orange Dye

2021 ◽  
pp. 1-7
Author(s):  
Fairooz Kareem ◽  
Mahasin Al-Kadhemy ◽  
Asrar Saeed
Keyword(s):  
Acridine Orange ◽  
Magnesium Oxide ◽  
Fluorescence Spectra ◽  
Aluminium Oxide ◽  
Blue Shift ◽  
Red Shift ◽  
Oxide Nanoparticles ◽  
Absorption And Fluorescence Spectra ◽  
Aluminium Oxide Nanoparticles ◽  
Al2o3 Nps

Absorption and fluorescence spectroscopy techniques were applied to investigate the photophysical characteristics of acridine orange (AO) dye in solvents that included distilled water, dimethyl sulfoxide (DMSO), acetone and ethanol in various concentrations (1×10-4–1×10-6) M. All of the samples were served at room temperature. The relationships between various parameters describing the strength of optical transitions in atoms and molecules were reviewed. This study expresses various viewpoints by describing how concentration and solvent affect the dye's absorption and fluorescence spectra. The absorption spectra of AO exhibit a band at (490 nm), except for DMSO, which shifts more towards red by 5 nm. The fluorescence spectra show a blue shift in AO aqueous solution around 6 nm until (0.5×10-4) M, followed by a red shift at around 7 nm at (1×10-6) M. There is a blue shift in (1×10-5) M for DMSO at around 4 nm, then a 10 nm red shift in higher concentrations as well as a 9 nm red shift in acetone and 6 nm in ethanol. Adding magnesium oxide nanoparticles (MgO NPs) quenched AO in both absorption and fluorescence spectra, whereas maximum fluorescence and intensity increased when aluminium oxide nanoparticles (Al2O3 NPs) were added to the solution. KEYWORDS Laser dye, absorption spectrum, fluorescence spectrum, MgO NPs, Al2O3 NPs

A fluorescent sensor based on aggregation-induced emission: highly sensitive detection of hydrazine and its application in living cell imaging

The Analyst ◽  
2018 ◽  
Vol 143 (18) ◽  
pp. 4298-4305 ◽  
Author(s):  
Jiabin Qiu ◽  
Yunxiang Chen ◽  
Shengjie Jiang ◽  
Hongyu Guo ◽  
Fafu Yang
Keyword(s):  
Living Cell ◽  
Cell Imaging ◽  
Fluorescent Sensor ◽  
Sensitive Detection ◽  
Aggregation Induced Emission ◽  
Highly Sensitive ◽  
Highly Sensitive Detection ◽  
Living Cell Imaging

A fluorescent sensor based on aggregation-induced emission for amines was prepared and its highly sensitive detection of hydrazine and application in living cell imaging were investigated in detail.

Driving force to detect Alzheimer's disease biomarkers: application of a thioflavine T@Er-MOF ratiometric fluorescent sensor for smart detection of presenilin 1, amyloid β-protein and acetylcholine

The Analyst ◽  
2020 ◽  
Vol 145 (13) ◽  
pp. 4646-4663
Author(s):  
Xing Ze Wang ◽  
Jing Du ◽  
Nan Nan Xiao ◽  
Yan Zhang ◽  
Ling Fei ◽  
...  
Keyword(s):  
Driving Force ◽  
Fluorescent Sensor ◽  
Low Cost ◽  
Amyloid Β ◽  
Amyloid Β Protein ◽  
Disease Biomarkers ◽  
Β Protein ◽  
Highly Sensitive ◽  
Highly Sensitive Detection ◽  
Detection Strategies

ThT@Er-MOF has been successfully applied in highly sensitive detection of three main Alzheimer Disease biomarkers through three different low cost and facile detection strategies.

Highly sensitive detection of CB[7] based on fluorescence resonance energy transfer between RhB and gold nanoparticles

2019 ◽  
Vol 16 ◽  
Author(s):  
Yan Zeng ◽  
Qikun Shi ◽  
Xiran Yang ◽  
Sobhan Chatterjee ◽  
Zaosheng Lv ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Rhodamine B ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Macrocyclic Compounds ◽  
Highly Sensitive ◽  
Visible Spectra ◽  
Highly Sensitive Detection

Background: Cucurbit[n]uril (CB[n], n=5, 6, 7, 8 and 10）is a type of macrocyclic compounds formed by n glycerol units and 2n methylene. The different size of the cavity led the different chemical characteristics of CB[n]. Therefore, it was very important to distinguish and detect CB[n]. Methods: At room temperature, Rhodamine B was added with gold nanoparticles solution. The above mixture was respectively mixed with different concentrations of Cucurbituril [n] or β-cyclodextrin solutions. The fluorescence spectra and ultraviolet-visible spectra of samples were determined. Results: It was found that 1.2nM gold nanoparticles could quench the fluorescence of 1μM Rhodamine B completely. After adding a certain amount of Cucurbituril[7], the fluorescence intensity of Rhodamine B was restored. Compared with other macrocyclic compounds, such as Cucurbituril[5], Cucurbituril[6] and β-cyclodextrin, we found that this method had unique selectivity for Cucurbituril[7]. Under the optimal conditions, the fluorescence recovery efficiency was linearly proportional to the concentration of Cucurbituril[7] in the range of 0.8-8 μg·mL-1. The detection limit was 0.21 μg·mL-1. Conclusion: We have established an effective and practical FRET-based detection method for CB[7] with RhB as donor and the gold nanoparticles as the acceptor. The system has unique and extensively selectivity for CB[7].

Magnetic Separation Fluorescent Sensor for Highly Sensitive Detection of Aflatoxin B1

2018 ◽  
Vol 47 (11) ◽  
pp. 1128001
Author(s):  
曾云龙 ZENG Yun-long ◽  
张敏 ZHANG Min ◽  
易守军 YI Shou-jun ◽  
何盼 HE Pan ◽  
赵敏 ZHAO Min ◽  
...  
Keyword(s):  
Magnetic Separation ◽  
Aflatoxin B1 ◽  
Fluorescent Sensor ◽  
Sensitive Detection ◽  
Highly Sensitive ◽  
Highly Sensitive Detection

Highly Sensitive Detection of Tb3+ and ATP Based on A Novel Asymmetric Anthracene Derivatives

2022 ◽  
Author(s):  
Song Zhao ◽  
Hongbo Jiang ◽  
Chengbin Gong ◽  
Wenjing Qi ◽  
Lianzhe Hu ◽  
...  
Keyword(s):  
Fluorescent Sensor ◽  
Sensitive Detection ◽  
Sensitive Assay ◽  
Highly Sensitive ◽  
Anthracene Derivatives ◽  
Highly Sensitive Detection

A novel fluorescent sensor based on an asymmetric anthracene derivatives (SSAPA) was designed and synthesized. By using this molecule, a rapid and sensitive assay for detecting Tb3+ and ATP in...

Sign in / Sign up

Export Citation Format

Share Document