New derivatives of pyrimidine nucleosides: Synthesis, physico-chemical properties and biological activity

1988 ◽  
Vol 25 (3) ◽  
pp. 1039-1042 ◽  
Author(s):  
Lorenzo De Napoli ◽  
Luciano Mayol ◽  
Simonetta Bartolucci ◽  
Gennaro Piccialli ◽  
Mosé Rossi ◽  
...  
Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1883
Author(s):  
Martin Pisárčik ◽  
Miloš Lukáč ◽  
Josef Jampílek ◽  
František Bilka ◽  
Andrea Bilková ◽  
...  

Phosphorus-containing heterocyclic cationic surfactants alkyldimethylphenylphospholium bromides with the alkyl chain length 14 to 18 carbon atoms were used for the stabilization of silver nanodispersions. Zeta potential of silver nanodispersions ranges from +35 to +70 mV, which indicates the formation of stable silver nanoparticles (AgNPs). Long-chain heptadecyl and octadecyl homologs of the surfactants series provided the most intensive stabilizing effect to AgNPs, resulting in high positive zeta potential values and smaller diameter of AgNPs in the range 50–60 nm. A comparison with non-heterocyclic alkyltrimethylphosphonium surfactants of the same alkyl chain length showed better stability and more positive zeta potential values for silver nanodispersions stabilized with heterocyclic phospholium surfactants. Investigations of biological activity of phospholium-capped AgNPs are represented by the studies of antimicrobial activity and cytotoxicity. While cytotoxicity results revealed an increased level of HepG2 cell growth inhibition as compared with the cytotoxicity level of silver-free surfactant solutions, no enhanced antimicrobial action of phospholium-capped AgNPs against microbial pathogens was observed. The comparison of cytotoxicity of AgNPs stabilized with various non-heterocyclic ammonium and phosphonium surfactants shows that AgNPs capped with heterocyclic alkyldimethylphenylphospholium and non-heterocyclic triphenyl-substituted phosphonium surfactants have the highest cytotoxicity among silver nanodispersions stabilized by the series of ammonium and phosphonium surfactants.


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.


1997 ◽  
Vol 50 (12) ◽  
pp. 983-991 ◽  
Author(s):  
VINOD R. HEGDE ◽  
PING DAI ◽  
MIN CHU ◽  
MAHESH PATEL ◽  
ROBERT BRYANT ◽  
...  

1990 ◽  
Vol 43 (5) ◽  
pp. 449-455 ◽  
Author(s):  
AKIHIKO FUJIE ◽  
TOSHIRO IWAMOTO ◽  
NOBUHARU SHIGEMATSU ◽  
MASAMI EZAKI ◽  
MOTOHIRO HINO ◽  
...  

2001 ◽  
Vol 54 (1) ◽  
pp. 74-83 ◽  
Author(s):  
VINOD R. HEGDE ◽  
JACK SILVER ◽  
MAHESH PATEL ◽  
VINCENT P. GULLO ◽  
RAYMOND YARBOROUGH ◽  
...  

1992 ◽  
Vol 45 (9) ◽  
pp. 1467-1471 ◽  
Author(s):  
MLTSUAKI TSUNAKAWA ◽  
NOBUJIRO KOMIYAMA ◽  
OSAMU TENMYO ◽  
KOJI TOMITA ◽  
KIMIO KAWANO ◽  
...  

2020 ◽  
Vol 71 (2) ◽  
pp. 121-127
Author(s):  
Antonina Gritco-Todirascu ◽  
Dorina Emilia Creanga ◽  
Liliana Mihaela Ivan ◽  
Dana Ortansa Dorohoi ◽  
Anamaria Ciubara

The present paper is focused on determination of the main parameters of Chlortetracycline. Chlortetracycline belongs to one of the most used family of antibiotics worldwide, Tetracyclines. Because of the large spectrum of infections which can be treated with this category of antibiotics there are attempts to find new derivatives from this class. The compounds derived from the same basic structure exhibit same chemical properties, that is why knowing in detail the main physico-chemical properties of Chlortetracycline could be a real help in synthesize new efficient derivatives. In order to evaluate the reactivity and biological activity HyperChem was used to establish the optimized structure, the electro-optical, the energetic and QSAR parameters. The solvatochromic methods allowed determining the intermolecular interactions types and their contribution to the spectral shifts of measured electronic absorption bands. Based on computational and solvatochromic results, the excited state dipole moment of Chlortetracycline was established by variation method.


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.


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