scholarly journals Water soluble metal-polymeric complexes of gallium and triple co-polymer of N-vinylpyrrolidone with N-vinylformamide and N-vinylminodiacetic acid

2019 ◽  
Vol 485 (3) ◽  
pp. 306-310
Author(s):  
N. I. Gorshkov ◽  
A. Yu. Murko ◽  
I. I. Gavrilova ◽  
I. I. Malakhova ◽  
V. D. Krasikov ◽  
...  
Keyword(s):  
Molecular Weight ◽  
1H Nmr ◽  
Metal Ion ◽  
Water Soluble ◽  
Polymer Complex ◽  
Nmr Data ◽  
Exclusion Chromatography ◽  
Polymeric Complexes ◽  
Metal Polymer

A terpolymer with a molecular weight of 45 kDa containing 7 mol.% of vinylamine units, 80 mol.% of vinylpyrrolidone, and 3 mol.% of vinyliminodiacetic acid units has been synthesized. Its complexation with Ga3+ ion has been studied by HPLC. The resulting metal–polymer complex has been characterized by exclusion chromatography and spectral (IR, 1H NMR) data. The complex has a monomolecular structure where the metal ion acts as an anchor fragment between vinyliminodiacetic acid units and is stable in the reaction of interligand exchange with histidine.

scholarly journals Mixed-ligand gallium complexes with N-vinylpyrrolidone- N-vinylformamide-N-vinyliminodiacetic acid terpolymers containing dithiocarbamates as a coligand

2019 ◽  
Vol 485 (4) ◽  
pp. 442-446
Author(s):  
N. I. Gorshkov ◽  
A. Yu. Murko ◽  
I. I. Gavrilova ◽  
I. I. Malakhova ◽  
V. D. Krasikov ◽  
...  
Keyword(s):  
Molecular Weight ◽  
1H Nmr ◽  
Mixed Ligand ◽  
Polymer Complexes ◽  
Nmr Data ◽  
Composition And Structure ◽  
Exclusion Chromatography ◽  
Metal Polymer ◽  
Gallium Complexes

Terpolymers with a molecular weight of 65 and 13 kDa containing 90 mol.% of N-vinylpyrrolidone, 7 mol.% of N-vinylformamide, and 3 mol.% of N-vinyliminodiacetic acid units have been synthesized. Diethyldithiocarbamate and benzyldithiocarbamate have been used as coligands. The mixed-ligand complexation with Ga3+ ion has been studied by HPLC. The composition and structure of the resulting metal-polymer complexes have been determined by exclusion chromatography and spectral (IR, 1H NMR) data.

scholarly journals Metal-Polymer Complexes of Gallium/Gallium-68 with Copolymers of N-Vinylpyrrolidonewith N-Vinylformamideand N-Vinyliminodiacetic Acid: A Hint for Radiolabeling of Water-Soluble Synthetic Flexible Chain Macromolecules

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2889
Author(s):  
Nikolay I. Gorshkov ◽  
Аndrey Yu. Murko ◽  
Iirina I. Gavrilova ◽  
Мarina А. Bezrukova ◽  
Аlbert I. Kipper ◽  
...  
Keyword(s):  
Water Soluble ◽  
Size Exclusion ◽  
Optical Methods ◽  
Polymer Complex ◽  
Polymer Complexes ◽  
Wide Range ◽  
Exclusion Chromatography ◽  
Gallium 68 ◽  
Metal Polymer

Copolymer of N-vinylpyrrolidone (VP) with vinylformamide (VFA) and N-vinyliminodiacetic acid (VIDA) was synthesized; its metal-polymer complexes (MPCs) with gallium were obtained. The complexes were characterized by size exclusion chromatography, hydrodynamic and optical methods, scanning electron microscopy, and spectral methods (UV, IR, 1Н NMR spectroscopy). It was demonstrated that in going from polymer to complex, hydrodynamic parameters of macromolecules change only slightly, although the polymer contains intramolecular Ga(VIDA)2 fragments in its structure. A new method for preparation of MPCs with gallium and gallium-68 radionuclide was suggested. The obtained metal-polymer complex is stable over a wide range of pH values as well as in the histidine challenge reaction. In vivo distribution experiments in intact animals showed high primary accumulation of thegallium-68 MPC in blood with subsequent excretion via urinary tract.

Novel Enzymatically Synthesized Substituted Polyaniline with High Conjugation and Conductivity

MRS Advances ◽  
2018 ◽  
Vol 3 (27) ◽  
pp. 1519-1524
Author(s):  
Ferdinando F. Bruno ◽  
Ramaswamy Nagarajan ◽  
Weeradech Kiratitanavit ◽  
Nicole Favreau-Farhadi ◽  
Bora Yoon ◽  
...  
Keyword(s):  
Thin Film ◽  
Molecular Weight ◽  
Water Soluble ◽  
Enzymatic Polymerization ◽  
Polymer Complex ◽  
Unique Combination ◽  
Modeling Studies ◽  
Acidic Conditions ◽  
Enzymatic Route ◽  
Film Conductivity

ABSTRACTAn efficient enzymatic route for the synthesis of conducting oligomer of substituted aniline complexed with poly(sodium 4-styrenesulfonate) is presented. This polyelectrolyte assisted horseradish peroxidase catalyzed oligomerization of ortho-toluidine provides a route to synthesize water-soluble, highly conductive oligomers under acidic conditions. The UV-Vis, FTIR, thin film conductivity, molecular weight assessment and modeling studies of the oligomer/polymer complex indicate the presence of a thermally stable and electroactive oligomer with extended conjugation that was not present in similar conductive polymers (e.g. PANI). Moreover, the use of water-soluble templates provide a unique combination of properties such as high conductivity and processability. The same procedure was also implemented for the polymerization of 2,6-xylidine: however, the reaction did not occur suggesting a much more complex stereo-specificity of the enzymatic polymerization. Modeling studies were used to explain this behavior. The conductive poly(ortho-toluidine) can be used in chemiresistive sensors for the detection of humidity.

1H-NMR-based water-soluble low molecular weight compound characterization and free fatty acid composition of five kinds of Yunnan dry-cured hams

LWT ◽  
2019 ◽  
Vol 108 ◽  
pp. 174-182 ◽  
Author(s):  
Shuyun Liu ◽  
Guiying Wang ◽  
Zhichao Xiao ◽  
Yuehong Pu ◽  
Changrong Ge ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Free Fatty Acid ◽  
Acid Composition ◽  
1H Nmr ◽  
Water Soluble ◽  
Low Molecular Weight

scholarly journals Characterization of high molecular weight compounds in urban atmospheric particles

2005 ◽  
Vol 5 (8) ◽  
pp. 2163-2170 ◽  
Author(s):  
V. Samburova ◽  
R. Zenobi ◽  
M. Kalberer
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Atmospheric Aerosols ◽  
Uv Spectroscopy ◽  
Organic Aerosol ◽  
Large Mass ◽  
Water Soluble ◽  
Size Exclusion ◽  
Ionization Mass ◽  
Exclusion Chromatography

Abstract. The chemical nature of a large mass fraction of ambient organic aerosol particles is not known. High molecular weight compounds (often named humic-like substances) have recently been detected by several authors and these compounds seem to account for a significant fraction of the total organic aerosol mass. Due to the unknown chemical structure of these compounds quantification as well as a determination of their molecular weight is difficult. In this paper we investigate water soluble humic-like substances in ambient urban aerosol using size exclusion chromatography-UV spectroscopy and laser desorption/ionization mass spectrometry (LDI-MS). LDI-MS was used for the first time to investigate HULIS from atmospheric aerosols. A careful evaluation of the two method shows that both methods complement each other and that both are needed to learn more about the molecular weight distribution and the concentration of humic-like substances. An upper molecular weight limit of humic-like substances of about 700 Da and a concentration of 0.3-1.6 µg/m3 air can be estimated, corresponding to 9-30% of the total organic carbon for an urban background site.

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