Ratiometric sensors with selective fluorescence enhancement effects based on photonic crystals for the determination of acetylcholinesterase and its inhibitor

2020 ◽  
Vol 8 (48) ◽  
pp. 11001-11009
Author(s):  
Rong Liu ◽  
Lijiao Bao ◽  
Sihan Zhang ◽  
Zhaoyang Wu ◽  
Jun Zhou ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Fluorescence Enhancement ◽  
Fluorescent Sensors ◽  
Quantitative Analyses ◽  
Ratiometric Sensors

Ratiometric fluorescent sensors are powerful tools for quantitative analyses.

Co-Fluorescence Enhancement System Based on Phenyl Salicylate and Lanthanum for the Determination of Terbium

1998 ◽  
Vol 31 (13) ◽  
pp. 2231-2240 ◽  
Author(s):  
Guiyun Zhu ◽  
Ruoxi Wang ◽  
Rongxiu Zhu ◽  
Shudao Xu
Keyword(s):  
Fluorescence Enhancement ◽  
Phenyl Salicylate

scholarly journals DETERMINATION OF TYPE AND MARK OF PROJECTILES BY METHOD OF X-RAY FLUORESCENCE SPECTRAL ANALYSIS IN THE STUDY OF PNEUMATICALLY SHOT INJURIOUS TO SOME CLOTHING MATERIALS

2016 ◽  
Vol 16 ◽  
pp. 391-398
Author(s):  
I. M. Kozachenko
Keyword(s):  
Spectral Analysis ◽  
Small Group ◽  
Elemental Composition ◽  
Medical Examination ◽  
X Ray ◽  
Qualitative And Quantitative ◽  
Foreign Production ◽  
Quantitative Analyses

The X-ray fluorescence spectral qualitative and quantitative analyses were performed for the elemental composition of 4 marks of bullets for pneumatic weapon of home and foreign production, and also for imitators of common clothing materials camouflage fabric and cotton knitwear. It is determined that lead bullets for pneumatic weapons are capable to introduce some elements of their composition, which are inherent in one or another mark of bullets, to the area of damage on certain clothing materials, in particular, camouflage fabric and cotton knitwear. This expands the possibilities of forensic medical examination when dealing with a problem of determining the type and mark of a bullet or of a small group of bullets similar in their elemental composition, due to which the pneumatical shot injuries of examined objects took place.

A highly selective and sensitive fluorescent chemosensor for Hg2+ based on a pyridine-appended π-conjugated ligand

RSC Advances ◽  
2014 ◽  
Vol 4 (87) ◽  
pp. 47000-47004 ◽  
Author(s):  
Yaping Yang ◽  
Xin-Long Ni ◽  
Tao Sun ◽  
Hang Cong ◽  
Gang Wei
Keyword(s):  
Aqueous Solution ◽  
Organic Synthesis ◽  
Fluorescence Enhancement ◽  
Fluorescent Chemosensor ◽  
Selective Method ◽  
Pure Aqueous Solution

A sensitive and selective method for the determination of Hg2+ cations by fluorescence enhancement in pure aqueous solution was developed and obtained by simple organic synthesis.

Development of highly selective fluorescent sensors for detection of glycolipids in vesicles and visualization of glutamate for neuronal imaging

2020 ◽  
Author(s):  
◽  
Ming Xu
Keyword(s):  
Fluorescence Enhancement ◽  
Chemical Sensor ◽  
Fluorescent Sensor ◽  
Hydrophobic Effect ◽  
Fluorescent Sensors ◽  
Nucleophilic Aromatic Substitution ◽  
Sensor System ◽  
Aromatic Substitution ◽  
Glutamate Binding ◽  
A Cell

[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI-COLUMBIA AT REQUEST OF AUTHOR.] Fluorescent sensors are very useful tools for exploring chemical biology and advanced medical research. Herein, we propose four different fluorescent sensor systems for the recognition of some important biological molecules. The first sensor system is a multi-component fluorescent sensor complex for the sensing of glycolipids. The glycolipid sensor system is a novel design that takes advantage of supramolecular self-assembly. Results show that it can bind with both the sugar headgroup and hydrocarbon tail of glycolipids, and turn on the fluorescence of the sensor system. The second sensor is a cell-impermeable fluorescent sensor system for the recognition and extraction of glycolipids from vesicles. To avoid the fluorescence enhancement caused by the hydrophobic effect from cell membrane, we designed a series of cell-impermeable sensor complexes. In addition, these complexes were fully explored by vesicle studies. Another fluorescent sensor is NS600 which was developed for detecting and imaging glutamate in neurons. This sensor system that utilizes a nucleophilic aromatic substitution for glutamate binding, and produces a 270-fold fluorescence enchantment upon glutamate binding. Also, it overcomes drawbacks of previous glutamate sensors including low signal response and poor sensitivity. It enables a clear and accurate visualization of glutamate in cultural neurons. The last sensor is NS570, a cell-impermeable glutamate sensor which could be loaded into synaptic vesicles by vesicle cycling. This sensor is a reversible chemical sensor that gives a 2600-fold fluorescence enhancement upon the titration with glutamate and can be used to monitor the release of neuronal glutamate in real time.

Analysis of Acetone Peroxide Premixes for Bleaching and Maturing Flour

1964 ◽  
Vol 47 (2) ◽  
pp. 363-366
Author(s):  
James T Taylor
Keyword(s):  
Hydrogen Peroxide ◽  
Qualitative Method ◽  
Collaborative Study ◽  
Organic Peroxides ◽  
Dilute Sulfuric Acid ◽  
Quantitative Analyses ◽  
Single Determination ◽  
Acetone Peroxide ◽  
Qualitative Analyses

Abstract A quantitative and a qualitative method for the determination of acetone peroxides were subjected to collaborative study. Quantitative analyses are based upon liberation and titration of hydrogen peroxide from acyclic peroxides and hydroperoxides by dilute sulfuric acid and standardized potassium permanganate, respectively. Single determination of 6 samples (varying in per cent levels of peroxide equivalent) each of baking premixes and milling premixes produced very good collaborative results. Qualitative analyses, achieved by comparing infrared spectra of acetone-extracted organic peroxides with acetone-extracted organic peroxides from a reference premix, gave peaks characteristic of the premixes. No interferences were seen from various starch blanks. Both the quantitative and the qualitative methods are recommended for adoption as official, first action.

Novel Cleanup Method for Quantitative Gas Chromatographic Determination of Trace Amounts of Di-2-Ethylhexyl Phthalate in Fish Lipid

1981 ◽  
Vol 64 (2) ◽  
pp. 282-286 ◽  
Author(s):  
B Garth Burns ◽  
Charles J Musial ◽  
John F Uthe
Keyword(s):  
Gel Permeation Chromatography ◽  
Chromatographic Determination ◽  
Confirmatory Test ◽  
Fish Lipid ◽  
Gel Permeation ◽  
Fish Lipids ◽  
Cleanup Procedure ◽  
Quantitative Analyses ◽  
Ethylhexyl Phthalate

Abstract A new, simple, and rapid cleanup procedure is described for di-2-ethylhexyl phthalate (DEHP) residues in fish lipids. Extracts are chromatographed on small alumina:sulfuric acid-impregnated alumina (layered) columns after gel permeation chromatography of the fish lipid extracts on BioBeads SX-3. Quantitative analyses were carried out by electron capture gas chromatography using 2 columns. Spiked DEHP recoveries varied from 79.3% in mackerel to 86.1% in herring. DEHP concentrations were determined in plaice, eel, redfish, herring, cod, and mackerel tissues and ranged from trace (<0.001 µ/g) to approximately 10 µ/g (wet wt basis). Ethanolic KOH saponification of the purified DEHP fraction, resulting in the disappearance of the DEHP peak, was used as a confirmatory test. Limited studies with dibutyl, di-n-heptyl, and diethyl phthalates suggest that the method can be made more versatile.

TiO2-coated 2D photonic crystals for reflectometric determination of malachite green

2019 ◽  
Vol 186 (12) ◽  
Author(s):  
Bhargav R. Patel ◽  
Kenichi Maeno ◽  
Hashwin V. S. Ganesh ◽  
Tatsuro Endo ◽  
Kagan Kerman
Keyword(s):  
Photonic Crystals ◽  
Malachite Green
Sign in / Sign up

Export Citation Format

Share Document