Introduction. Medicinal plants are a rich, almost inexhaustible source of medicinal substances, and due to their large chemical diversity of metabolites available for isolation their research is always an important task. One of the promising medicinal plants for research is marsh cinquefoil (Comarum palustre L.), widely used in folk medicine for the treatment of diseases of the musculoskeletal system.Aim. Isolation of individual secondary metabolites from the aerial part of C. palustre and their subsequent structural elucidation by NMR experiments.Materials and methods. The aerial parts of the marsh cinquefoil, were collected next to the Saint Petersburg State Chemical-Pharmaceutical University Nursery Garden of Medicinal Plants (Leningrad region, Vsevolozhsky district, Priozerskoe highway, 38 km) in July 2021. Fraction analysis was performed through analytical high-performance liquid chromatography (HPLC) using a LC-20 Prominence (Shimadzu corp., Japan) equipped with a SPD-M20A diode-array detector. The isolation of compounds was carried out by open column chromatography using sorbents with different selectivity, as well as by preparative HPLC using a Smartline system (Knauer, Germany) equipped with a spectrophotometric detector. The structures of the isolated compounds were established by 1D NMR experiments (Bruker Avance III 400 MHz, Germany).Results and discussion. Seven individual compounds (1–7) were isolated and their structures elucidated. Two compounds (1 and 2) are derivatives of ellagic acid, namely 4-O-α-L-arabinofuranoside ellagic acid (1) and 4-O-β-D-glucopyranoside ellagic acid (2), while the other five compounds are derivatives of flavonoids: kaempferol-3-O-β-D-glucuronide (3), quercetin-3-O-β-D-glucuronide (4), quercetin-3-O-β-D-(6’’-β-D-glucopyranosyl)-glucopyranoside (5), quercetin-3-O-β-D-(2’’-galloyl)-glucopyranoside (6) and (+)-catechin (7).Conclusion. As a result of the current research, seven individual compounds were isolated from the aerial part of the marsh cinquefoil and their structure were elucidated. Compounds 1, 2, 4, 5 and 6 were found and isolated from the aerial part of C. palustre L. for the first time.

In December 2022, a team of authors prepared and published in the English version the monograph Nomenclature and rank correlation of higher taxa of eukaryotes, dedicated to a review of higher taxa of eukaryotes and solving the problem of their rank correlation. The introductory part of the work shows significant milestones in the history of eukaryotic megasystematics, whereas the methodological part discusses the principles and approaches to the nomenclature of the higher taxa of this domain. The authors carried out a revision of the system of eukaryotic organisms with references to the original descriptions of the corresponding taxa, considered the trends in the transformation of the system, and discussed issues of its practical application. The book contains descriptions of the subdomain Obimoda, the kingdom Crumalia, and the phyla Mantamonadea, Rigifilidea, and Collodictyonidea. The monograph crowned with a retrospective summary of the main eukaryotic systems published in the period 19252022 and an extensive list of papers on megasystematics and microbiology of eukaryotes. The present review is devoted to the evaluation of this theoretically and practically important work.

Marsh cinquefoil (Comarum palustre L.) is a perennial herb from the Rosaceae family. It has been used for long in folk medicine in form of infusions, tinctures and decoctions of the underground and aboveground parts of this plant. Nonetheless it is not a pharmacopoeial plant and requires additional research. The goal of this study was to review the existing literature data on the chemical composition of the aerial and underground organs of the marsh cinquefoil (Comarum palustre L.) and their pharmacological activity. Over the period from 1963 to the present, more than 130 components have been identified in the aboveground and underground parts of the marsh cinquefoil, mainly belonging to the group of phenolic compounds, tannins, fatty acids, polysaccharides and amino acids. Several aspects of pharmacological activity of the total extracts and individual secondary metabolites of the marsh cinquefoil have been studied; anti-inflammatory, hypoglycemic, nephroprotective, antiviral, antioxidant and other types of biological activity have been experimentally confirmed. Literature data analysis showed that the marsh cinquefoil represents a rich source of biologically active substances and is promising for the creation of new drugs, therefore, further study of its metabolites and their biological activity is of great interest.

Introduction. Understanding the mechanisms of accumulation of individual groups of biologically active substances in promising types of plant raw materials and the possibility of predicting them is important for solving fundamental and applied problems of pharmaceuticals. To date, differences have been revealed in the qualitative and quantitative composition of secondary metabolites in the aboveground and underground of Comarum palustre L., however, the issue remains unstudied.Aim. Comparative metabolomic study of the composition of the primary metabolites of the aboveground and underground parts of Comarum palustre L.Materials and methods. The object of the study was the aboveground and underground parts of Comarum palustre L., harvested in the vicinity of the nursery of medicinal plants of the St. Petersburg State Chemical and Pharmaceutical University (Leningrad Region, Vsevolozhsky District, Priozerskoe Highway, 38 km) in 2019 and dried. Metabolomic studies based on GC-MS method was perfomed. A statistical analysis based on the MetaboAnalyst 5.0 platform was used.Results and discussion. Analysis of the chromatograms obtained using the GC-MS method revealed the content of 933 primary metabolites in the aboveground and underground parts of Comarum palustre L., 120 of which were identified. Using a number of statistical methods, 10 metabolites from monosaccharides, acids and alcohols, making the greatest contribution to the manifestation of differences between the studied samples, were identified.Conclusion. The study revealed the relationship between the composition of primary and secondary metabolites in medicinal plant raw materials.