Potentiometric sensors arrays based on perfluorinated membranes and silica nanoparticles with surface modified by proton-acceptor groups, for the determination of aspartic and glutamic amino acids anions and potassium cations

2018 ◽  
Vol 816 ◽  
pp. 21-29 ◽  
Author(s):  
Ekaterina Safronova ◽  
Anna Parshina ◽  
Tatyana Kоlganova ◽  
Olga Bobreshova ◽  
Gerald Pourcelly ◽  
...  
Keyword(s):  
Amino Acids ◽  
Silica Nanoparticles ◽  
Potentiometric Sensors ◽  
Proton Acceptor ◽  
Perfluorinated Membranes ◽  
Surface Modified

Application of Silica Nanoparticles in the Determination of Herbicides in Environmental Water Samples Using Liquid Chromatography-Mass Spectroscopy

2020 ◽  
Vol 16 (5) ◽  
pp. 748-756
Author(s):  
Mir Waqas Alam ◽  
Tentu Nageswara Rao ◽  
Yarasani Prashanthi ◽  
Vourse Sridhar ◽  
Adil Alshoaibi ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Liquid Chromatography ◽  
Silica Nanoparticles ◽  
Solid Phase ◽  
Silica Nanoparticle ◽  
Environmental Water ◽  
Phase Extraction ◽  
Functionalized Nanoparticles ◽  
Supporting Material

Background: Herbicides are very beneficial in the crop yield with the aid of controlling weeds within the agriculture, but several herbicides are chronic in soil. Objective: In this study, nanoparticles and the packages of synthesized novel silica nanoparticles were studied for the preconcentration of herbicides. Methods: These nanoparticles prepared by the Stöber mechanism were purified and functionalized. Nanoparticles thus prepared successfully were used as supporting material for the preconcentration of residues of herbicides in the water. Results: Preconcentration was achieved by preparing the silica-based solid-phase-extraction cartridges. Nanoparticles used for this purpose were within the range of 50-250 nm. An SPE cartridge was prepared by packing 200 mg of silica nanoparticle in the empty cartridge of diameter 5.5 cm and length 0.6 cm in between PTFE frits. Aqueous solutions of 0.1 μg/ml of herbicides were prepared separately, and 10 ml of the solution was passed through the cartridge at the rate of 0.2 ml/min. After passing 10 ml volume of the aqueous solution, residues adsorbed on the cartridge were eluted using 2 ml of acetonitrile. The eluate was injected to determine the herbicide residue adsorbed on the SPE cartridge. Conclusion: In the study, it was found that greater than 90% of the herbicide residues were trapped on silica nanoparticle-based SPE cartridge. An analytical method was developed for the simultaneous determination of these herbicides. The residues were quantified by LC-MS/MS with ESI mode.

scholarly journals Rapid Organocatalytic Chirality Analysis of Amines, Amino Acids, Alcohols, Amino Alcohols and Diols with Achiral Iso(thio)cyanate Probes

2021 ◽  
Author(s):  
Eryn Nelson ◽  
Jeffrey S. S. K. Formen ◽  
Christian Wolf
Keyword(s):  
Amino Acids ◽  
Absolute Configuration ◽  
Rapid Determination ◽  
Amino Alcohols ◽  
Enantioselective Synthesis ◽  
Widespread Occurrence ◽  
Chiral Compounds ◽  
New Methods ◽  
The Absolute

The widespread occurrence and significance of chiral compounds does not only require new methods for their enantioselective synthesis but also efficient tools that allow rapid determination of the absolute configuration,...

scholarly journals THE DETERMINATION OF ARGININE IN THE PRESENCE OF OTHER AMINO ACIDS BY MEANS OF THE SAKAGUCHI REACTION

1939 ◽  
Vol 129 (1) ◽  
pp. 263-271
Author(s):  
Lloyd E. Thomas ◽  
Janet K. Ingalls ◽  
James Murray Luck
Keyword(s):  
Amino Acids

scholarly journals DETERMINATION OF AMMONIA EVOLVED FROM α-AMINO ACIDS BY peri-NAPHTHINDAN-2,3,4-TRIONE HYDRATE AND ITS m-NITRO DERIVATIVE

1950 ◽  
Vol 184 (2) ◽  
pp. 693-696
Author(s):  
Radwan Moubasher ◽  
Aly Sina ◽  
William Ibrahim Awad ◽  
Abd-El Mogid Othman
Keyword(s):  
Amino Acids ◽  
Nitro Derivative
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