Abstract
The contents of the major groups of biologically active compounds (catechins, flavonoids, tannins, saponins, pectin, and carotenoids) and total antioxidants (TA) in the leaves and the flowers of Agastahe rugosa_(Fisch. & C.A. Mey.) Kuntze, Betonica officinalis L., Dracocephalum nutans L., Mentha caucasica Gand., Nepeta grandiflora M. Bieb., Origanum vulgare L., Scutellaria baicalensis Georgi (Lamiaceae), collected during the flowering period of 2019 in “Collections of living plants indoors and outdoors” USU 440534 of Central Siberian Botanical Garden SB RAS, Novosibirsk, were studied. The concentrations of constituent majority were higher in leaves compared to flowers. In the leaves, maximums of catechins (15.60 mg-g-1, B. officinalis), flavonoids (61.5 mg-g-1, S. baicalensis), saponins (178.5 mg-g-1, D. nutans), and protopectin (106.0 mg g-1, B. officinalis) were revealed. In the flowers, maximums of tannins (247.4 mg g-1, O. vulgare) and pectin (16.31 mg g-1, S. baicalensis) were found. Maximum of total antioxidant contents (TAC) (6.21 mgg-1) was detected in the leaves of O. vulgare. Positive correlations between TAC and the content of tannins and flavonoids were revealed. The results confirm health benefits of the studied species and contribute to the knowledge of the distribution of saponins and pectins in the Lamiaceae.
Highlights
Lamiaceae Lindl. is a large plant family of mostly shrubs and herbs, which are popular due to various biological effects on human health, including antioxidant and antimicrobial properties closely associated with a variety of secondary metabolites [1]
Bieb., Origanum vulgare L., Scutellaria baicalensis Georgi were collected during the flowering period of 2019 from “Collections of living plants indoors and outdoors” USU 440534 of CSBG SB RAS in the garden plot located in a forest-steppe region with gray forest soil and the mean yearly temperature/precipitation of 1.8 °C/448 mm
The absorption of the solution was measured at wavelengths corresponding to absorption maxima of chlorophyll a (Ca) (662 nm), chlorophyll b (Cb) (644 nm), and carotenoids (440.5 nm) [15]
Summary
Lamiaceae Lindl. is a large plant family of mostly shrubs and herbs, which are popular due to various biological effects on human health, including antioxidant and antimicrobial properties closely associated with a variety of secondary metabolites [1]. Is a large plant family of mostly shrubs and herbs, which are popular due to various biological effects on human health, including antioxidant and antimicrobial properties closely associated with a variety of secondary metabolites [1]. Chemical composition of Lamiaceae members combines a variety of terpenoids with iridoid glycosides, flavonoids and other phenolic compounds [4]. Carotenoids and flavonoids were reported to be crucial determinants of antioxidant properties of plants [5]. Pectin was proved to have diverse biological activities including lipid and cholesterol level lowering effects, serum glucose content lowering effects, and anti-cancer activities [7]. Variation of health promoting compounds through locations and plant body parts are in focus of current investigations with particular emphasis on the constituents with high antioxidant activity [9]
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