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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.
Makarov D. M., Kalikin N., Fashchevsky K. A. et al., Electrochimica Acta 2026 Vol. 579 Article 150159
Machine learning (ML) has become a powerful tool for accelerating the development of carbon-based supercapacitors;
however, most published models assume that a single predictive framework can describe both conventional
porous carbons and hybrid carbon electrodes. Here, we test this assumption using a comprehensive
benchmark dataset and an extended literature-curated dataset enriched with synthesis- and electrolyte-related
descriptors. Three ML algorithms ...
Added: October 13, 2026
Shi R., Yu Y., Chibisov A., International Journal of Hydrogen Energy 2025 Vol. 107 P. 52–62
Cyanide containing wastewater can cause livestock death and reduce agricultural production and electrochemical reduction of cyanide (CNRR) is a promising way to eliminate its harm and turn waste into valuable products. However, the reaction mechanism and function of electrocatalysts for CNRR have not been fully understood yet. Herein we identify a two-dimensional (2D) conductive copper-organic ...
Added: October 11, 2026
Ekaterina D. Riumina, Klink G. V., Alekseeva E. et al., PNAS, США 2026 Vol. 123 No. 35 P. 1–20
The role of escape from the cytotoxic T cell (CTL) response in SARS-CoV-2 evolution remains controversial. Here, we study the origin and spread of SARS-CoV-2 variants whose mutations reduce presentation by the HLA class I alleles common in human populations. We find that 35% of mutations that are characteristic of the variants of concern, and ...
Added: October 2, 2026
Zhukov A., Chen F., Zeng Y. et al., Nanoscale 2026 Vol. 18 No. 36 P. 19223–19253
Colloidal semiconductor nanocrystals have emerged as promising materials for next-generation light-emitting diodes (LEDs) owing to their solution processability, tunable emission wavelengths, narrow emission linewidths, and high photoluminescence quantum yields. Among them, anisotropic nanocrystals, including one-dimensional nanorods (NRs) and two-dimensional nanoplatelets (NPLs), offer additional opportunities for controlling transition dipole moment orientation and light out-coupling efficiency. These ...
Added: October 2, 2026
Мальцева В. Е., Ananyev I., Milevskii N. et al., Molecular Systems Design and Engineering 2026 Vol. 11 No. 7 P. 691–704
The use of hydrophobic deep eutectic solvents (DESs) as extractants for metal ion separation is largely due to the ease of their preparation and the possibility of modifying them depending on the composition of the metal mixture to be separated. However, the most common approach to DES modification involves the replacement of the extractant, while ...
Added: October 2, 2026
Мальцева В. Е., Ananyev I., Golubev A. V. et al., Russian Journal of Inorganic Chemistry 2026 Vol. 71 P. 724–736
Two voluminous polymer silver(I) salts of perchlorinated dodecoborate clusters, {[(Me2CO)Ag(μ-Me2CO)2Ag(Me2CO)][μ-B12Cl12]}n (1) and {[DMFAg(μ-DMF)2AgDMF][μ-B12Cl12]}n (2) were synthesized. The 35Cl nuclear quadrupole resonance (NQR) spectroscopy supplemented with the X-ray diffraction data was applied for identifying and analyzing noncovalent interactions Cl···X in these salts. Whereas in X-ray diffraction, noncovalent interactions are associated with the presence of the shortened ...
Added: October 2, 2026
Мальцева В. Е., Rozhkov A., Ananyev I. et al., Inorganic Chemistry 2026 Vol. 65 No. 22 P. 12484–12496
Despite the well-established importance of chalcogen bonding in crystal engineering and supramolecular chemistry, experimental charge density data for TeII-centered chalcogen bonds have remained entirely absent, leaving the electronic nature of these interactions uncharacterized at the level of directly measured electron density. Here, we report the first high-resolution X-ray diffraction (HRXRD) study of TeII-centered chalcogen bonds, ...
Added: October 2, 2026
Ostovari Moghaddam A., Mehrabi-Kalajahi S., Solizoda I. A. et al., Metals and Materials International 2026 P. 1–9
Off-stoichiometric boron-doped chemically complex intermetallic alloys (CCIMAs) have recently emerged as a new avenue for overcoming the low temperature brittleness of ordered superlattices. However, their behavior at high temperatures remains unexplored. In this study, a novel (Ni39.6Co29.3Cr10Al15.8Ta3.3Nb2)98.5B1.5 CCIMA was prepared and its oxidation resistance over a wide temperature range (500 °C–950 °C) was studied. The ...
Added: October 1, 2026
Kashpurovich I., Oleynichenko A., Stegailov V., Supercomputing Frontiers and Innovations 2026 Vol. 13 No. 1 P. 52–73
We report a high-performance implementation of the resolution-of-the-identity Hartree–Fock method that fully exploits the permutational symmetry of three-center electron repulsion integrals (ERI). The present implementation adopts a hybrid MPI+OpenMP parallelization strategy. Two different algorithmic approaches (with and without the pre-transformation of ERIs) are compared. A custom data layout introduced previously is employed. Designed to efficiently ...
Added: September 28, 2026
E.V. Garankina, Посаженникова В. С., Шоркунов И. Г., News of Russian Science Academy. Geographic serie 2025 Vol. 89 No. 4 P. 578–603
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 ...
Added: March 21, 2026
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 ...
Added: September 8, 2025
Bobkov V. I., Dli M. I., Orekhov V. A. et al., CIS Iron and Steel Review 2024 Vol. 27 P. 4–8
The paper presents the experimental thermogravimetric unit for determination of the efficient heat transfer coefficient during drying and roasting of sintering charge from iron ore lump and pelletized raw material within the temperature ranges and aerodynamic conditions of the operating roasting conveyor machines, during complicated and power-intensive chemical-metallurgical process of iron ore raw material roasting ...
Added: September 26, 2024
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
studied. It was established that an increase in the temperature of hydrothermal treatment of peat facilitated
not only an increase in the yield of gas but ...
Added: June 25, 2024
Biochar characteristics produced via hydrothermal carbonization and torrefaction of peat and sawdust
Krysanova K. O., Krylova A. Y., Kulikova M. V. et al., Fuel 2022 Vol. 328 Article 125220
Biochars made by hydrothermal carbonization and torrefaction of sawdust and peat in a wide temperature
range have been studied. A comparative evaluation of the properties of the resulting materials was carried
out by the following methods: elemental analysis, FTIR, Raman Spectroscopy, TG/TGA, SEM, Fluorescence
analysis, BET. It has been established that hydrothermal carbonization has a greater effect on ...
Added: June 25, 2024
Novenko Elena, Tsyganov A., Nizovtsev V., Quaternary International 2019 Vol. 516 P. 58–69
Climate change and human activity considerably influenced the temperate European deciduous forests through the Holocene, with the anthropogenic impacts being detected even in currently protected areas. This paper is focused on the area of the Kaluzhskiye Zaseki Nature Reserve, which contains remnants of primary broadleaved forests in central European Russia. Here, we present a new ...
Added: October 11, 2021
Tsyganov A., Kupriyanov D., Babeshko K. et al., The Holocene 2019 Vol. 29 P. 120–129
Lateral expansion of floating vegetation mats over the surface of aquatic ecosystems (terrestrialization) is one of the ways of peatland development. This process was commonly studied in kettle-hole lakes, whereas karst ponds have received less attention. We used a suite of palaeoecological analyses at Karstovoe mire (Mordovia, Russia) to reconstruct the formation of a floating ...
Added: October 11, 2021
Khasanov B., Савинецкий А. Б., Quaternary Research 2019 Vol. 91 No. 3 P. 934–952
We present the results of multiproxy study of a peat deposit from Carlisle Island (the Islands of Four Mountains,
Aleutians). Vegetation on the initial stage of the peat is characterized by heath vegetation dominated by Ericales
indicating cold conditions at 7300–6100 cal yr BP. The appearance of Betula and Alnus is the result of long-distance
transportation attributable to ...
Added: October 31, 2020
Zaichenko V. M., Knyazeva M. I., Krylova A. Y. et al., Solid Fuel Chemistry 2019 Vol. 53 No. 3 P. 159–165
The effect of mild pyrolysis methods (hydrothermal carbonization and torrefaction) on the physi-cochemical properties of biocoal was studied. It was established that biocoal obtained by hydrothermal car-bonization has a large specific surface area and exerts an exothermic effect upon decomposition; as comparedwith the samples obtained by torrefaction, it has a more dispersed structure and lower ...
Added: November 19, 2019
Medvedeva E., Urvatsev I., Yu. N. Zhenikhov et al., Thermal Engineering (English translation of Teploenergetika) 2017 No. 6 P. 408–414
This article presents a detailed analysis of the economic efficiency of peat utilization for generating electricity and heat in Russian rural areas and decentralized power consumption areas on the basis of the comparison of power tariffs (prices) and full costs of peat-based electricity and heat production. The research was performed using the model-information complex detailed ...
Added: October 9, 2017
Особенности применения инфракрасных термогравиметрических установок для определения влажности кормов
Секанов Ю. П., Андреева Н. В., Техника и оборудование для села 2012 № 7 С. 24–29
The results of studies of grass fodders drying in infrared thermogravimetric units are presented. The basic factors affecting measurement accuracy of moisture are determined. ...
Added: November 29, 2012