Amphiphilic derivatives of sodium alginate and hyaluronate: synthesis and physico-chemical properties of aqueous dilute solutions

2000 ◽  
Vol 43 (4) ◽  
pp. 343-349 ◽  
Author(s):  
S Pelletier ◽  
P Hubert ◽  
F Lapicque ◽  
E Payan ◽  
E Dellacherie
2020 ◽  
Vol 49 (20) ◽  
pp. 6566-6571 ◽  
Author(s):  
Daniela Lalli ◽  
Stefano Marchesi ◽  
Fabio Carniato ◽  
Chiara Bisio ◽  
Lorenzo Tei ◽  
...  

A combination of solid-state NMR and 1H-NMR relaxometric investigations has been employed to characterize the structure and physico-chemical properties of a novel synthetic saponite intercalated with Gd(iii) and Y(iii) chelates.


2019 ◽  
pp. 28-44
Author(s):  
V. V. Parchenko

Modern medicine and pharmacy has at its disposal highly efficient synthetic drugs. Large extent of these drugs accounted for derivatives of 1,2,4-triazole. The purpose of the work was an attempt to summarize the literature in recent years related to the methods of synthesis and study of physico-chemical properties 3-thio- and 3-thio-4-amino derivatives of 1,2,4-triazole. Studies national scientists in recent years indicates prospects of the search in this direction, since this class of organic compounds is interest not only to scientists pharmaceutical, medical and veterinary field, but also among researchers of engineering, metallurgical and agricultural areas. 1,2,4-triazole derivatives are also widely used in practice for optical materials, photosensitizers are used as coloring agents, antioxidants, additives for fuels and oils, some of which are widely used as corrosion inhibitors for controlling various pests in agriculture. In addition, 1,2,4-triazole derivatives belong to the class low toxic or essentially non-toxic substances. The presence of a growing number of publications about methods of synthesis, reactions, physico-chemical and biological properties of 1,2,4-triazole, inspires scientists around the world search for perspective molecules of substituted 1,2,4-triazole. It should be noted that in spite of a sufficient amount of information about the derivatives of 1,2,4-triazole, some issues related to the generalization of data in the literature synthesis presented insufficient.


2008 ◽  
Vol 59 (2) ◽  
pp. 216-219 ◽  
Author(s):  
Mihaela Dimitriu ◽  
Liliana-Mihaela Ivan ◽  
Dana-Ortansa Dorohoi

A series of structural and physico � chemical properties of some monosubstituted halogene � derivatives of benzene were analyzed by using HyperChem software package. The bond lengths, the angle between the covalent bonds, atomic charges, the symmetry class, the energies of the ground and excited states, the dipole moments, the polarizabilities, the wavelengths of the electronic transitions and the corresponding oscillator strengths have been obtained and correlated with experimental data published for the studied compounds. The computed molecular polarizability a is directly correlated with the measured halogene atomic electronegativity. A polynomial dependence of order two was evidenced between the valence vibration wavenumber of C-X bond, experimentally determined and the computed polarizability.


1993 ◽  
Vol 42 (2) ◽  
pp. 288-294 ◽  
Author(s):  
V. V. Davydov ◽  
V. L. Sokol ◽  
E. V. Balebanova ◽  
Yu. V. Shklyaev ◽  
S. V. Sergeev ◽  
...  

Author(s):  
Andrew Skorobogaty ◽  
Thomas D. Smith ◽  
Geoffrey Dougherty ◽  
John R. Pilbrow

2014 ◽  
Vol 61 (2) ◽  
pp. 49-54
Author(s):  
M. Stankovičová ◽  
Ž. Bezáková ◽  
P. Mokrý ◽  
P. Salát ◽  
M. Kočík ◽  
...  

Abstract The aim of this paper is the study of physico-chemical properties of the chosen compounds, derivatives of 2-hydroxy-3-[2-(4-methoxyphenyl) ethylamino]propyl-4-[(alkoxycarbonyl)amino]benzoates and 2-hydroxy-3-[2-(2-methoxyphenyl)ethylamino]propyl-4-[(alkoxycarbonyl) amino]benzoates with potential ultra-short beta-adrenolytic activity. The studied compounds are different in the position of the substituent on the benzene ring in the side chain as well as in the aromatic ring in position 4 with alkyl- (methylto butyl-) carbamate. The physico-chemical characteristics, for example, lipophilicity, surface activity, adsorbability, acidobasic properties etc., are very important for the explanation of the relationship between structure and biological activity of the drug. These parameters serve as the base of quantitative structure-activity study. The goal of this work is to establish the spectral characteristics of studied compounds in UV-area, pKa values, the parameters of lipophilicity (the values of Rf and RM from thin layer chromatography, retention time t´R and capacity factor k´ from liquid chromatography and experimental partition coefficients log P´ values), surface tension, critical micelle concentrations, the adsorbability of compounds expressed by percent of adsorbed compound on active charcoal β% as well as by Freundlich adsorption isotherms. The obtained values are correlated with the parameters characterising the size of molecule, for example, the number of carbon atoms on carbamate functional group.


1988 ◽  
Vol 25 (3) ◽  
pp. 1039-1042 ◽  
Author(s):  
Lorenzo De Napoli ◽  
Luciano Mayol ◽  
Simonetta Bartolucci ◽  
Gennaro Piccialli ◽  
Mosé Rossi ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document