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Type of publication: Tezės kituose recenzuojamuose leidiniuose / Theses in other peer-reviewed publications (T1e)
Field of Science: Biochemija / Biochemistry (N004)
Author(s): Juškaitė, Liudvika;Kaškonienė, Vilma;Ragažinskienė, Ona
Title: Investigation of antioxidant activity in medicinal plants and their mixtures, identical to commercial teas, by spectrophotometric and chromatographic methods
Is part of: The vital nature sign [elektroninis išteklius] : 9th international scientific conference : abstract book. Kaunas : Vytautas Magnus university, 2015, [no. 9]
Extent: p. 118-118
Date: 2015
Keywords: Antioxidant activity;Phenolic compounds;Flavonoids
Abstract: There is a quite large number of science publications about various medicinal plants, their antioxidant properties and biological activities, describing plants’ use for human health. These articles characterize one or a few plants separately, but none of them try to evaluate how these popular in daily life widely used plants act together. The purpose of this research was to evaluate the total amounts of secondary metabolites in separate medicinal plants and their mixtures by spectrophotometric methods and to carry out qualitative analysis by HPLC. Seven medicinal plants were analysed: leaves of peppermint (Mentha piperita L.), lemon balm (Melissa officinalis L.) and raspberry (Rubus idaeus L.), thyme (Thymus vulgaris L.) herb, blossoms of chamomile (Matricaria recutita L.), seeds of caraway (Carum carvi L.) and rose hips (Rosa L.). All these plants were grown in the Kaunas Botanical Garden of Vytautas Magnus University. The three mixtures of plants were made parallel to the three Lithuanian commercial ETNO teas (JSC Švenčionių Vaistažolės). Spectrophotometric assays (evaluating total phenolic compounds content, total flavonoid content and antiradical activity) with separate medicinal plants showed that the highest total amount of phenolic compounds was found in peppermint leaves (217.91 mg rutin equivalents (RE)/g), the lowest – in the seeds of caraway (21.02 mg RE/g). The highest and lowest total flavonoid contents were detected in peppermint and in rose hips, i.e., 87.65 and 0.77 mg RE/g, respectively. The highest radical scavenging activity was in the leaves of lemon balm and peppermint (265.32 and 261.91 mg RE/g, respectively), while caraway seeds showed the lowest activity (17.06 mg RE/g). All of the herbal mixtures showed the synergistic effect of phenolic compounds, whereas the interaction of flavonoids was rather more antagonistic. [...]
Affiliation(s): Biochemijos katedra
Gamtos mokslų fakultetas
Vytauto Didžiojo universitetas
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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