Optical activity of D-glyceraldehyde in aqueous solutions

1984 ◽  
Vol 49 (5) ◽  
pp. 1167-1172 ◽  
Author(s):  
Michal Fedoroňko
Keyword(s):  
Nmr Spectroscopy ◽  
Aqueous Solutions ◽  
Optical Activity ◽  
Equilibrium Mixture ◽  
Specific Rotation ◽  
Temperature Range ◽  
H Nmr ◽  
Dilute Aqueous Solutions

In dilute aqueous solutions, D-glyceraldehyde exists both in the free and hydrated monomeric forms; the equilibrium between them depends on the temperature. The specific rotation of the equilibrium mixture was measured polarimetrically in the temperature range from 20 to 80 °C, the concentrations of both forms being determined by 1H NMR spectroscopy. From these data, the specific rotations of both forms of D-glyceraldehyde in the indicated temperature range were calculated.

Molecular Motions and Interactions in Aqueous Solutions of Thymosin‐β 4 , Stabilin CTD and Their 1 : 1 Complex, Studied by 1 H‐NMR Spectroscopy

ChemPhysChem ◽  
2020 ◽  
Vol 21 (13) ◽  
pp. 1420-1428
Author(s):  
M. Bokor ◽  
Á. Tantos ◽  
A. Mészáros ◽  
B. Jenei ◽  
R. Haminda ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Aqueous Solutions ◽  
Molecular Motions ◽  
H Nmr

Retracted: Molecular Motions and Interactions in Aqueous Solutions of Thymosin‐β 4 , Stabilin C‐Terminal Domain (CTD) and Their 1:1 Complex Studied by 1 H NMR Spectroscopy

ChemPhysChem ◽  
2018 ◽  
Vol 19 (7) ◽  
pp. 848-856 ◽  
Author(s):  
Mónika Bokor ◽  
Ágnes Tantos ◽  
Attila Mészáros ◽  
Bence Jenei ◽  
Réka Haminda ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Aqueous Solutions ◽  
Molecular Motions ◽  
H Nmr ◽  
Terminal Domain

scholarly journals Retraction: Molecular Motions and Interactions in Aqueous Solutions of Thymosin‐β 4 , Stabilin C‐Terminal Domain (CTD) and Their 1:1 Complex Studied by 1 H NMR Spectroscopy

ChemPhysChem ◽  
2020 ◽  
Vol 21 (9) ◽  
pp. 958-958
Author(s):  
Mónika Bokor ◽  
Ágnes Tantos ◽  
Attila Mészáros ◽  
Bence Jenei ◽  
Réka Haminda ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Aqueous Solutions ◽  
Molecular Motions ◽  
H Nmr ◽  
Terminal Domain

scholarly journals Nanosilica A-300 influence on water structures formed on the bioactive agent Enoxil

2016 ◽  
Vol 94 (1) ◽  
pp. 88-94 ◽  
Author(s):  
Vladimir V. Turov ◽  
Tudor Lupascu ◽  
Tatyana V. Krupska ◽  
Igor Povar
Keyword(s):  
Nmr Spectroscopy ◽  
Low Temperature ◽  
Aqueous Solutions ◽  
Composite System ◽  
H Nmr ◽  
Concentrated Solution ◽  
Bioactive Agent

The interactions of water and aqueous solutions of HCl with the Enoxil preparation and its composite system Enoxil–SiO2 (1:1) have been studied by low-temperature 1H NMR spectroscopy. The antacid properties in the preparation, manifested in the transformation of a concentrated solution of HCl in a weakly concentrated one, have been established. In the composite system, adsorbed HCl in a hydrophobic environment of CDCl3 may generate a system of clusters with different acid concentrations, while the equilibrium is shifted toward less concentrated forms.

Hydrolysis of ethylenediphosphinetetraacetate anions

1983 ◽  
Vol 48 (6) ◽  
pp. 1552-1557
Author(s):  
Jana Podlahová ◽  
Jaroslav Podlaha
Keyword(s):  
Nmr Spectroscopy ◽  
Aqueous Solutions ◽  
Stability Of Solutions ◽  
Laboratory Temperature ◽  
H Nmr ◽  
Isolation And Characterization ◽  
Acid And Base ◽  
The Stability ◽  
Hydrolysis Of

The anions of ethylenediphosphinetetraacetic acid are hydrolyzed in aqueous solutions at 80 °C in the two following reactions: ((OOCCH2)2PCH2CH2P(CH2COO)2)4- → (OOCCH2(O)HPCH2CH2PH(O)CH2COO)2- → (O(O)HPCH2CH2PH(O)O)2-. Both reactions are acid and base catalyzed so that, at pH < 12, the first reaction is much faster than the second. The reaction course was studied by 1H NMR spectroscopy and by isolation and characterization of the products. The effect of both reactions on the stability of solutions of ethylenediphosphinetetraacetic acid and their salts is negligible at laboratory temperature.

Conformational study on ribonucleoside O-phosphonylmethyl derivatives by 1H NMR spectroscopy

1985 ◽  
Vol 50 (8) ◽  
pp. 1899-1905 ◽  
Author(s):  
Milena Masojídková ◽  
Jaroslav Zajíček ◽  
Miloš Buděšínský ◽  
Ivan Rosenberg ◽  
Antonín Holý
Keyword(s):  
Nmr Spectroscopy ◽  
1H Nmr ◽  
1H Nmr Spectroscopy ◽  
Conformational Study ◽  
H Nmr ◽  
Conformational Properties

Conformational properties of ribonucleoside 5'-O-phosphonylmethyl derivatives have been determined by 1H NMR spectroscopy and compared with those of natural nucleosides and 5'-nucleotides.

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