Papers by Evgeniya Karpova
chemistry of plant raw material, 2013
China were studied by HPLC. The aglycones content in hydrolysates of the majority of the species ... more China were studied by HPLC. The aglycones content in hydrolysates of the majority of the species is about 1%, and quercetin and dihydroquercetin prevail in aglycones composition. In Rh. adamsii and Rh. parvifolium aglycones are found predominantly in the free state, and in the species of the subsection Rhodorastra-in a bound one. Values of paired affinity of the investigated species on composition of phenolic compounds of extracts and hydrolysates vary from 30 to 90%, maximums are in pairs Rh. sichotense-Rh. dauricum, Rh. adamsii-Rh. ledebourii. As a result of the analysis of affinity of flavonoids composition of the species relation with D. Chamberlain's anatomo-morphological classification is not exposed. Significant value of affinity Rh. adamsii and Rh. parvifolium is revealed. The minimum value of group affinity on flavonoids composition of extracts and hydrolysates of Rh. impeditum casts doubt on his position equally with Rh. parvifolium in the subsection Lapponica.
Chemistry of plant raw material, 2013
China were studied by HPLC. The aglycones content in hydrolysates of the majority of the species ... more China were studied by HPLC. The aglycones content in hydrolysates of the majority of the species is about 1%, and quercetin and dihydroquercetin prevail in aglycones composition. In Rh. adamsii and Rh. parvifolium aglycones are found predominantly in the free state, and in the species of the subsection Rhodorastra-in a bound one. Values of paired affinity of the investigated species on composition of phenolic compounds of extracts and hydrolysates vary from 30 to 90%, maximums are in pairs Rh. sichotense-Rh. dauricum, Rh. adamsii-Rh. ledebourii. As a result of the analysis of affinity of flavonoids composition of the species relation with D. Chamberlain's anatomo-morphological classification is not exposed. Significant value of affinity Rh. adamsii and Rh. parvifolium is revealed. The minimum value of group affinity on flavonoids composition of extracts and hydrolysates of Rh. impeditum casts doubt on his position equally with Rh. parvifolium in the subsection Lapponica.
Leaf pigments and concentrations of phenolic compound in Begonia grandis plantlets obtained from the floral explants
Rendiconti Lincei. Scienze Fisiche e Naturali
BIO Web of Conferences
For the first time, the phenolic profile of poorly studied Siberian species of the genus Myricari... more For the first time, the phenolic profile of poorly studied Siberian species of the genus Myricaria Desv. Myricaria longifolia (Willd.) Ehrenb. was investigated by HPLC and LC-MS/MS in comparison with that of wide-ranging species M. bracteata Royle. 65 quantitative parameters of the phenolic profiles were processed by ANOVA and principal component analysis (PCA). The results suggest that the distinction between the species is mainly determined by the variance in total flavonoids and free quercetin in the leaves. Free gallic and ferulic acids, hyperoside and total phenolics in aqueous ethanol extract, as well as kaempferol and rhamnazin in the hydrolyzed extract contributed to the difference between the species. The significant differences justify the positions of these species in two individual series of the genus Myricaria established before. The statistical analysis of the biochemical data allowed us to identify both the characters that determined the distinction between species, a...
chemistry of plant raw material, 2014
Botanica Pacifica, 2019
We studied the leaves of Begonia grandis Dryand. subsp. grandis, the northernmost and most cold-r... more We studied the leaves of Begonia grandis Dryand. subsp. grandis, the northernmost and most cold-resistant representative of the predominantly tropical genus Begonia, by histochemical methods. In glandular and nonglandular trichomes as well as in the epidermal cells of B. grandis Dryand. subsp. grandis leaves, phenolic compounds, including flavonoids, as well as terpenoids and carbonyl compounds were detected. The patterns of phenolic compounds in the acetone and ethanol leaf exudates and in leaves as a whole were similar and contained oxalic, citric, and gallic acids, isoquercitrin, and orientin. Concentrations of phenolic compounds in the acetone and ethanol exudates constituted 0.10 % and 2.59 % of all phenolic compounds in the leaves, respectively. Antimicrobial effects of the aqueous ethanol extract and of the ethanol exudate against reference strains of Bacillus subtilis, Staphylococcus aureus, and Candida albicans were detected at the disc con tents of 50.0 and 45.8 μg, respectively. The observed set of characteristics can be used in a targeted search for highly antimicrobial species of Begoniaceaе.
Revista Brasileira de Farmacognosia, Sep 1, 2017
Myricaria bracteata Royle, Tamaricaceae, is a species with a wide geographic range that encompass... more Myricaria bracteata Royle, Tamaricaceae, is a species with a wide geographic range that encompasses Eastern Europe, Western and Central Siberia, Central Asia, and the Himalayas. This plant is used in traditional folk medicine in Russia (Siberia) and in China typically as an analgesic and for the treatment of some infections and certain types of intoxication. The aim of this study was to identify phenolic constituents of the leaves of M. bracteata from two considerably distant populations. Chromatographic profiles of the leaves of M. bracteata were analyzed for the first time. Seventeen compounds, mainly methyl ethers of quercetin (isorhamnetin, rhamnazin), kaempferol (kaempferide, rhamnocitrin), and ellagic acid as well as quercetin, quercetin 3-glucoside, kaempferol, luteolin, chrysoeriol, citric acid, gallic acid, methyl gallate, ethyl gallate, and ferulic acid were identified in hydrolyzed aqueous ethanol extracts of the leaves. Flavonols and ellagic acid were the major compounds in both samples. Isorhamnetin was the main flavonoid constituent. Kaempferide and rhamnazin were also abundant in the flavonoid complex of the leaves of M. bracteata from the Altai. This study shows that M. bracteata leaves are a source of flavonoids with possible biological activities.
Химия Растительного Сырья, Sep 11, 2014
Динамика содержания пигментов в листьях Begonia grandis Dryander subsp. grandis при интродукции в Западной Сибири (г. Новосибирск)
Vestnik Tomskogo gosudarstvennogo universiteta. Biologiya, 2016
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Papers by Evgeniya Karpova