Fluoride detection based on fluorescence enhancement of thioureido naphthalene derivative

2007 ◽  
Vol 85 (2) ◽  
pp. 153-156 ◽  
Author(s):  
Sourav Chakraborty ◽  
Matthew A Tarr
Keyword(s):  
Quantum Efficiency ◽  
Fluorescence Intensity ◽  
Fluorescence Enhancement ◽  
Enhanced Fluorescence ◽  
Naphthalene Derivative ◽  
Fluoride Sensor ◽  
Fluoride Detection ◽  
Fluoride Sensing

A novel thioureido naphthalene derivative was synthesized and characterized. The compound proved itself as an effective fluoride sensor with respect to selectivity and sensitivity. In acetonitrile, the fluorescence intensity increased by 40-fold with the addition of 5 equiv. of fluoride. Fluorescence intensity did not substantially change with other halides, suggesting that the thioureido protons interact strongly with fluoride but not with other halides. The enhanced fluorescence is due to increased quantum efficiency of the fluoride complex.Key words: fluoride sensing, thioureido compound, fluorescence.

scholarly journals Enhanced fluorescence properties of terbium complex/poly-l-lactic acid superfine fibers sensitized by the LSPR effect of silver nanoparticles

RSC Advances ◽  
2017 ◽  
Vol 7 (32) ◽  
pp. 19808-19814 ◽  
Author(s):  
Shipeng Wen ◽  
Guiming Zhang ◽  
Rong Zhang ◽  
Liqun Zhang ◽  
Li Liu
Keyword(s):  
Silver Nanoparticles ◽  
Lactic Acid ◽  
Quantum Efficiency ◽  
Fluorescence Intensity ◽  
Fluorescence Properties ◽  
Composite Fibers ◽  
Enhanced Fluorescence ◽  
Terbium Complex ◽  
Ag Nps ◽  
Lspr Effect

Due to the LSPR effect of Ag-NPs, the fluorescence intensity, quantum efficiency of Tb-complex in the composite fibers were improved.

Fluorescence enhancement of fisetin by silver nanoparticles with cetyltrimethyl ammonium bromide micelles

RSC Advances ◽  
2015 ◽  
Vol 5 (10) ◽  
pp. 7433-7439 ◽  
Author(s):  
Xiaodan Liu ◽  
Xia Wu
Keyword(s):  
Silver Nanoparticles ◽  
Fluorescence Intensity ◽  
Fluorescence Enhancement ◽  
Synergistic Action ◽  
Ammonium Bromide ◽  
Enhanced Fluorescence ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Metal Enhanced Fluorescence ◽  
Cetyltrimethyl Ammonium

The synergistic action of solubilization and sensitization of CTAB micelles and metal-enhanced fluorescence of AgNPs enhance fluorescence intensity of fisetin.

Fluorescence Enhancement of the Doxycycline– Europium Ion–Sodium Dodecyl Sulfonate System and Doxycycline Determination

2012 ◽  
Vol 554-556 ◽  
pp. 1905-1908 ◽  
Author(s):  
Hai Yan Wang ◽  
Bao Xiu Jia ◽  
Yu Qin Li ◽  
Renliang Wang ◽  
Caihong Liu ◽  
...  
Keyword(s):  
Detection Limit ◽  
Fluorescence Intensity ◽  
Fluorescence Enhancement ◽  
Sodium Dodecyl ◽  
Linear Range ◽  
Optimum Conditions ◽  
Sodium Dodecyl Sulfonate ◽  
Europium Ion ◽  
Tablet Formulations

A new sepctrofluorimetric method for the determination of doxycycline (DC) was developed based on its enhancement of the fluorescence intensity of europium ion in the presence of sodium dodecyl sulfonate(SDS). The mechanism of fluorescence enhancement was studied. Optimum conditions for the determination of DC were also investigated. The linear range was 0.10- 3.00μg/mL. The detection limit was 1.3ng/mL. There was no interference from the excipients normally used in tablet formulations and the serum compositions. The proposed method was successfully applied to the determination of DC in tablets.

scholarly journals Фотоиндуцированное усиление флуоресценции красителя эванса синего в водном растворе альбумина-=SUP=-*-=/SUP=-

2019 ◽  
Vol 126 (5) ◽  
pp. 636
Author(s):  
А.А. Намыкин ◽  
А.П. Хороводов ◽  
О.В. Семячкина-Глушковская ◽  
В.В. Тучин ◽  
И.В. Федосов
Keyword(s):  
Blood Plasma ◽  
Evans Blue ◽  
Fluorescence Spectra ◽  
Fluorescence Enhancement ◽  
Albumin Solution ◽  
Enhanced Fluorescence ◽  
Rat Blood ◽  
Dye Fluorescence ◽  
First Time ◽  
In Blood Plasma

AbstractThe effect of photoinduced enhancement of Evans blue (EB) dye fluorescence in blood plasma and albumin solution has been considered. Manifestations of the dye fluorescence enhancement in the albumin solution and rat blood plasma have been compared. Saturation of photoinduced fluorescence, the effect of enhanced fluorescence delay, and divergence in fluorescence spectra of the solutions have been found for the first time. Based on the obtained results, a hypothesis about the presence of nonfluorescent complexes with the EB participation in blood plasma is proposed.

scholarly journals Dansyl-Labelled Ag@SiO2 Core-Shell Nanostructures—Synthesis, Characterization, and Metal-Enhanced Fluorescence

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5168
Author(s):  
Elżbieta Szczepańska ◽  
Anna Synak ◽  
Piotr Bojarski ◽  
Paweł Niedziałkowski ◽  
Anna Wcisło ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Fluorescence Intensity ◽  
Control Sample ◽  
Core Shell ◽  
Enhanced Fluorescence ◽  
Shell Nanostructures ◽  
Dansyl Group ◽  
Transmission Electron ◽  
Silver Mirror ◽  
Water Wettability

The present work describes synthesis, characterization, and use of a new dansyl-labelled Ag@SiO2 nanocomposite as an element of a new plasmonic platform to enhance the fluorescence intensity. Keeping in mind that typical surface plasmon resonance (SPR) characteristics of silver nanoparticles coincide well enough with the absorption of dansyl molecules, we used them to build the core of the nanocomposite. Moreover, we utilized 10 nm amino-functionalized silica shell as a separator between silver nanoparticles and the dansyl dye to prevent the dye-to-metal energy transfer. The dansyl group was incorporated into Ag@SiO2 core-shell nanostructures by the reaction of aminopropyltrimethoxysilane with dansyl chloride and we characterized the new dansyl-labelled Ag@SiO2 nanocomposite using transmission electron microscopy (TEM) and Fourier-transform infrared spectroscopy (FTIR). Additionally, water wettability measurements (WWM) were carried out to assess the hydrophobicity and hydrophilicity of the studied surface. We found that the nanocomposite deposited on a semitransparent silver mirror strongly increased the fluorescence intensity of dansyl dye (about 87-fold) compared with the control sample on the glass, proving that the system is a perfect candidate for a sensitive plasmonic platform.

Visible light excitable 3-formylBODIPYs for selective fluorescent and colorimetric sensing of cysteine

2016 ◽  
Vol 20 (01n04) ◽  
pp. 444-455 ◽  
Author(s):  
Qinghua Wu ◽  
Yangchun Wu ◽  
Min Zhang ◽  
Changjiang Yu ◽  
Erhong Hao ◽  
...  
Keyword(s):  
Amino Acids ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Visible Light ◽  
Theoretical Calculation ◽  
Fluorescence Intensity ◽  
Formyl Group ◽  
Colorimetric Sensing ◽  
Enhanced Fluorescence ◽  
Detection Mechanism

Selective fluorescent and colorimetric sensing of cysteine in methanol-HEPES buffer (45 mM, pH [Formula: see text] 7.2, v/v [Formula: see text] 1/1) solution over various common amino acids and related thiol containing compounds has been achieved based on the cyclization reaction between the formyl group on 3-formylBODIPYs and cysteine/homocystein. Upon addition of cysteine/homocystein, 3-formylBODIPYs exhibited greatly enhanced fluorescence intensity as well as an abvious red-shift of the absorption peak (20–30 nm). The detection limits for cysteine were in the range of 1.18–2.73 [Formula: see text]10[Formula: see text] M. The detection mechanism was studied by nuclear magnetic resonance and theoretical calculation.

scholarly journals Fluorescence Enhancement on Silver-Plated Plasma Micro-Nanostructured 3D Polymeric Microarray Substrates for Multiplex Mycotoxin Detection

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 392
Author(s):  
Georgios Koukouvinos ◽  
Chrysoula-Evangelia Karachaliou ◽  
Anastasia Kanioura ◽  
Katerina Tsougeni ◽  
Evangelia Livaniou ◽  
...  
Keyword(s):  
Ochratoxin A ◽  
Fluorescence Intensity ◽  
Aflatoxin B1 ◽  
Oxygen Plasma ◽  
Fluorescence Enhancement ◽  
Fumonisin B1 ◽  
Silver Deposition ◽  
Standard Glass ◽  
Glass Slides ◽  
Coefficients Of Variation

Oxygen plasma micro-nanostructured poly(methyl methacrylate) (PMMA) slides were modified through silver microparticle deposition to create microarray substrates that enhance the emitted fluorescence intensity. Silver deposition relied on a commercially available reagent and was completed in two 30-min incubation cycles of the substrate with the reagent. The fluorescence enhancement achieved using these substrates over flat PMMA slides was determined through the development of a microarray for the multiplexed detection of four mycotoxins, aflatoxin B1, ochratoxin A, fumonisin B1, and deoxynivalenol. It was shown that the implementation of silver-plated oxygen plasma micro-nanotextured PMMA substrates increased the signals obtained for aflatoxin B1 and ochratoxin A by approximately 2.8 times, 5.6 times for deoxynivalenol, and 16-times for fumonisin B1, compared to flat PMMA substrates. Most notably, this signal increase was not accompanied by a significant increase in the non-specific signal. In addition, the spot repeatability both across a single slide as well as between different slides was high, with coefficients of variation lower than 12%. The slides were also stable for at least three months, thus offering a microarray substrate with improved properties compared to standard glass slides, regarding both the absolute spot fluorescence intensity and between spots repeatability.

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