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Features of Obtaining and Properties of Fulvic Acid from the Peat of Nizhny Novgorod Region
Saudi Journal of Medical and Pharmaceutical Sciences. 2023. Vol. 9. No. 9. P. 617–628.
Коннова М. А., Волков А. А., Кострюков С. Г., Мельникова Н. Б.
Properties of fulvic acid (FA) extracted from the peat of the Nizhny Novgorod region of Russia by ultrasonic extraction with alkaline or ethanol solutions and further purification were studied in the paper. The purification of FA by the Lamar method was shown to possibly lead to the formation of FA polymorphs of the same composition but different structure (IR, solid-state 13С NMR, fluorescence, UV, energy-dispersive X-ray spectroscopy, SEM and optical microscopy, concentration of carboxyl and phenol groups). Aggregation of FA polymorphs in water led to the formation of nanoparticles with the average size of 8–10 nm and the zeta potential of –22 to –27 mV. The formation and properties of polymorphic supramolecular structures are greatly influenced by the drying mode. The solubility of the two FA polymorphs varied from freely soluble (3.3 mL of water per gram) after the FA solution freeze-drying to soluble (12 mL of water per gram) after the FA solution vacuum drying. The FA sample extracted by ethanol ultrasonic extraction from the peat, followed by convection drying, had a solubility of 666.7 mL of water per gram (Slightly soluble), a zeta potential of -6 mV, and a particle size of 15–20 nm.
Budkov Y., Kalikin N., Journal of Chemical Physics 2026 Vol. 165 Article 064506
A self-consistent statistical-mechanical theory of the Hall effect in electrolyte solutions is developed by extending the self-consistent Debye–Hückel–Onsager (SCDHO) framework to crossed electric and magnetic fields. The theory incorporates non-local ionic charge distributions via Slater-type form factors, regularizing the Coulomb interaction at short range, and accounts for dielectric friction through ion-specific coefficients, employing experimental values ...
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Tsydypova M., Современные проблемы дистанционного зондирования Земли из космоса 2026 Т. 23 № 3 С. 263–275
The article presents a methodology for mapping coniferous forest decline, based on the integration of automated remote sensing data interpretation techniques, vegetation indices, remote sensing data on above-ground biomass (Biomass CCI (Climate Change Initiative)), and materials from ground-based forest pathology surveys using forests of the Khamar-Daban ridge (Republic of Buryatia) as a case study. The ...
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Composite gel polymer electrolytes based on a perfluorinated sulfonic acid cation-exchange MF-4SC membrane
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sCeO2, and sTiO2, respectively) were prepared by casting from a dispersion in N,N-dimethylformamide and
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Manivelan S. V., Srinivasan S., Thamilmaran K. et al., Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 2026 Vol. 114 No. 1 Article 014217
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Moshkina E., Molokeev M., Zolotov A. et al., Journal of Alloys and Compounds 2026 Vol. 1077 Article 189412
A wide series of substitutions in a subsystem of small radii cations M = Al, Cr, Fe, Ga, Sc is possible in rare-earth borates ReM3(BO3)4 with the huntite structure. However, the existence of these compounds where M = Mn still raises doubts. The study presents a synthetic approach developed in the framework of the flux method allowing for the required ...
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Obijiofor O., Novikov A., New Journal of Chemistry 2026 Vol. 50 No. 23 P. 9749–9768
Rational design of gold-based nanocarriers for neurotherapeutics requires atomic-scale understanding of drug-material interactions. Density functional theory calculations were performed to investigate levodopa (L-DOPA) adsorption on small gold clusters (Au2–Au4) with cationic, neutral, and anionic charges, with additional validation on a larger Au10 cluster using multiple low-energy isomers. Binding free energies (ΔGbind), charge transfer, and electronic descriptors ...
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Das A., Saikia J., Maji N. et al., ChemNanoMat 2026 Vol. 12 No. 5 Article e202500733
Developing efficient photoactive materials from bio-derived resources is vital yet challenging for achieving effective water splitting performance. In this work, nano carbon dots (CDs) of zero-dimensional (0D) were synthesized from papaya peel through a simple and eco-friendly process and subsequently anchored onto the two-dimensional (2D) layered structure of graphitic carbon nitride (g-C3N4, GCN) at various ...
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Ostovari Moghaddam A., Mehrabi-Kalajahi S., Hossein Vasigh S. A. et al., The Journal of Physical Chemistry Letters 2026 Vol. 17 No. 13 P. 3978–3985
Water electrolysis is a key technology for sustainable energy conversion and hydrogen generation. Recently, high-entropy oxides (HEOs) have emerged as promising materials because they allow tuning of structural, electronic, and catalytic properties in multifunctional systems. Here, we report the synthesis of a multicomponent La(FeCoCuTiNiMnMgSnZn)O3 perovskite, and its hybridization with reduced graphene oxide (rGO) to form a ...
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Chowdhury U., Mondal S., Dey S. et al., Journal of the american chemical society 2026 Vol. 148 No. 23 P. 24538–24550
Covalent functionalization offers a versatile platform to engineer carbon nanotube properties for optoelectronics applications. We demonstrate by atomistic quantum dynamics simulation that covalent functionalization can renormalize the CNT band gap, split the degenerate CNT band edge states, and strongly influence charge carrier separation and recombination dynamics. Open-ring CNT functionalization (O-CNT) largely retains the π-conjugation, whereas ...
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Uskov F., Korobkov S., Birin K. P. et al., Journal of Photochemistry and Photobiology A: Chemistry 2026 Vol. 474 Article 116936
Oxidation of sulfides by singlet oxygen has been extensively studied, yet the structure-photoactivity relationship of these photosensitizers remains underinvestigated. In the present work the photocatalytic performance of a set of functionalized palladium(II) porphyrinates was comprehensively investigated in the photocatalytic oxidation of sulfides to reveal mutual influence of structural peculiarities onto the photosensitizing properties. The photophysical ...
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Mezentsev I., Dudarova N., Druzina A. et al., Journal of Photochemistry and Photobiology A: Chemistry 2026 Vol. 479 Article 117316
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Landscapes of Сentral European Russia were sculpted by the last Middle Pleistocene glaciation that constrained most of the following sedimentation in successive interglacial and periglacial settings to various depressions of the glacial paleolandscape. However, corresponding continuous postglacial sequences are extremely rare in the region due to the dramatic fluctuations of the regional base level and ...
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Коннова М. А., Волков А. А., Мельникова Н. Б., Медико-фармацевтический журнал «Пульс» 2024 Т. 26 № 7 С. 138–143
Fulvic acids (FA) are natural organic compounds obtained from the peat in the Nizhny Novgorod region
and used in the pharmacy, and require comprehensive studies not only to determine the authenticity, assay of the
main substance and impurities, but also to standardize the product. This is due, first of all, to the fact that
depending on the FA ...
Added: September 8, 2025
Коннова М. А., Волков А. А., Мельникова Н. Б., Journal of Drug Delivery and Therapeutics 2024 Vol. 14 No. 4
There is a high demand for the design of fulvic acids (FA) transdermal patches being natural biologically active substances with a wide action. The difficulties in FA transdermal patches creating are due to the peculiarities of FA obtaining with high purity and solubility, the existence of many several polymorphic forms, as well as the problems ...
Added: September 8, 2025
Коннова М. А., Волков А. А., Соловьева А. Г. et al., Scientia Pharmaceutica 2023 Vol. 91 No. 45
The formulation of the transdermal patch with fulvic acid (FA) on an emulsion basis using pluronic Kolliphor® p237 as a permeability enhancer was developed and studied for anti-inflammatory properties. FA was isolated from the peat in the Nizhny Novgorod region of Russia and characterized as a potential active pharmaceutical ingredient. In vitro studies of the release ...
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Bobkov V. I., Dli M. I., Orekhov V. A. et al., CIS Iron and Steel Review 2024 Vol. 27 P. 4–8
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Kulikova M. V., Krysanova K. O., Krylova A. Y. et al., Solid Fuel Chemistry 2022 Vol. 56 No. 4 P. 271–275
The inf luence of the thermophysical characteristics of biochars obtained by hydrothermal carbonization of peat on the yield and composition of producer gas in the course of its steam–air gasification was
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