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Your search keyword '"Zakharova, Lucia Ya"' showing total 7 results
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6. New piperidinium surfactants with carbamate fragments as effective adjuvants in insecticide compositions based on imidacloprid.

Author

Kushnazarova, Rushana A., Mirgorodskaya, Alla B., Vasilieva, Elmira A., Lenina, Oksana A., Petrov, Konstantin A., and Zakharova, Lucia Ya.

Subjects
CATIONIC surfactants, GREENHOUSE whitefly, ORNAMENTAL plants, INSECT pests, DISPERSING agents, IMIDACLOPRID
Abstract

BACKGROUND: Surfactants, particularly non‐ionic ones, are widely used as adjuvants in pesticide formulations due to their ability to maintain pesticide effectiveness without changing solution properties, such as pH. While non‐ionic surfactants are generally low‐toxic, stable, and excellent dispersants with high solubilization capabilities, they may be less effective than cationic surfactants, which offer superior surface activity, transport properties, and antimicrobial action. This study investigates the efficacy of new piperidinium surfactants with carbamate fragments as adjuvants in insecticide formulations containing imidacloprid. The efficacy of these formulations is being assessed against greenhouse whitefly, a pest known to harm cultivated and ornamental flowering plants. RESULTS: The aggregation behavior of piperidinium surfactants containing carbamate fragments was investigated, and their wetting effect was evaluated. Synthesized surfactants have lower CMC values compared to their methylpiperidinium analogue. The effect of piperidinium surfactants on the insecticide concentration on the surface and inside tomato leaves was assessed using spectrophotometric methods. It was found that the introduction of piperidinium surfactants with carbamate fragment at a concentration of 0.1% wt. allows for decrease in lethal concentration of imidacloprid up to 10 times, thereby testifying the marked increase in the effectiveness of imidacloprid against the greenhouse whitefly insect pest (Trialeurodes vaporariorum). It was shown that the main factors responsible for the enhanced efficacy of the insecticide were the ability of the surfactant to increase the concentration of imidacloprid on the leaf surfaces and improve their penetration into the plant. CONCLUSION: The presented work employed a comprehensive approach, which significantly increases the generalizability of the results obtained and provides the ability to predict the effect and target selection of adjuvants. © 2024 Society of Chemical Industry. [ABSTRACT FROM AUTHOR]

Published
2024
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7. A Supramolecular Amphiphile Based on Calix[4]resorcinarene and Cationic Surfactant for Controlled Self-Assembly

Author

Kharlamov, Sergey V., Kashapov, Ruslan R., Pashirova, Tatiana N., Zhiltsova, Elena P., Lukashenko, Svetlana S., Ziganshina, Albina Yu., Gubaidullin, Aidar T., Zakharova, Lucia Ya., Gruner, Margit, Habicher, Wolf D., and Konovalov, Alexander I.

Abstract

A novel supramolecular system based on calix[4]resorcinarene sulfonatoalkylated at the lower rim and piperidine-methylated at the upper rim and the cationic surfactant hexadecyl-1-azonia-4-azobicyclo[2.2.2]octane bromide was investigated by methods of NMR, tensiometry, conductometry, potentiometry, dynamic light scattering, X-ray powder diffraction, and spectral probe techniques. Both types of molecules were found to self-associate in aqueous solution, with aggregates of different morphology formed. Importantly, a supramolecular amphiphilic binary system with controlled structure and binding behavior could be fabricated. At high surfactant concentration, the formation of its own aggregates takes place. In the systems with the excess of cyclophane the supramolecular amphiphiles are formed, which, in turn, self-assemble in particles with a large hydrophobic core. Thereby the structure of supramolecular species is determined by relative fractions of components and, hence, could be selectively controlled. The found properties can be used for the design of nanocontainers with the controlled cavity size.

Published
2024
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