Химия

The use of near-infrared spectroscopy for quality control of nonsteroidal anti-infl ammatory drugs (NSAIDs) in blister packs is demonstrated. NSAIDs with the active ingredients ibuprofen, diclofenac, naproxen, etoricoxib, acetylsalicylic acid and meloxicam have been studied. IR spectra have been recorded using a Frontier FTIR spectrometer with a NIRA attachment, used to collect diff use refl ectance spectra of solids.

The problem of acid corrosion of steel is of signifi cant importance, particularly in the context of the oil extraction industry, where acid treatment of wells and surrounding spaces is widely employed. This research article focuses on the synthesis and investigation of previously unstudied derivatives of the class of 2-alkyl-5-phenyl-4,5,6,7-tetrahydro-[1,2,4]triazolo[1,5-a]pyrimidin-7-ols – organic compounds potentially highly eff ective as inhibitors of acid corrosion of steel.

Analysis of periodicals has showed that there is no information on the behavior of hybrid heterocyclic systems containing several pharmacophore fragments based on oxazol-5(4H)-ones and chromen-4(4H)-ones in reactions with thionizing reagents under various conditions.

Lipopolysaccharides are compounds of bacterial origin that have biological activity against plants, animals and humans. This work provides information on the preparation and characterization of the properties of modifi ed lipopolysaccharide derivatives of the rhizosphere bacterium Ochrobactrum cytisi IPA7.2. Deacylation has been carried out using alkaline hydrolysis, followed by chromatographic separation of the fractions. O-deacetylation of O-polysaccharide led to a 2-fold increase in the extinction of the products of the phenol-sulfuric acid reaction.

Tritium is the only one of the radioactive isotopes that a filtering system is unable to neutralize. It is produced by collateral fi ssion processes in nuclear reactors and displays itself in radioactive wastes and effl uents in diff erent forms of tritium oxides. Thus the development and application of nuclear energy entails a challenging problem of treating tritium-containing radioactive wastewater.The paper deals with tritium water isotopologues, namely, with prototritium water and deuterotritium water.

A critical review of the literature on the methods of concentration and extraction of biobutyric acid from fermentation solutions has been carried out. The best results of these processes are achieved by combining extraction with salting. It is proposed to use polyethylene glycols with diff erent molecular weights as non-fl ammable and environmentally friendly extractants.

Currently, the search for new types of carriers for low-molecular weight substances, as well as the development of optimal methods for the eff ective encapsulation of these substances are important tasks of modern chemistry and pharmacology. However, there are still limitations in this area, among which one of the most signifi cant is the lack of the optimal carrier capable of stably retaining a low-molecular weight substance. The work presents hybrid polymer structures obtained by in situ hydrothermal synthesis as an eff ective candidate for these purposes.

The constant increase in contamination of agricultural products with mycotoxins makes it urgent to develop new methods for their sorption, isolation, and determination. Molecular imprinting is a promising method for recognizing and isolating target molecules based on specifi c sorption mechanism. The work considers the possibility of obtaining and practical use of mycotoxin–specifi c selective sorbents based on imprinted polyaniline structures using a structural analogue of the mycotoxin zearalenone – 4-hydroxycoumarin.