The aim of this study was to determine the chemical profile of three herbal teas in Anatolia, Melissa officinalis, Sideritis libanotica subsp. linearis and Stachys thirkei by LC-MS/MS, HPLC-FLD and GC-MS. Additionally, the total phenolic-flavonoid contents, antimicrobial, antioxidant and anticholinesterase activities of three herbal teas extracts and their individual main compounds were determined. The major component of the fatty acids and essential oils were identified as linolenic acid (27.4%) and valencene (23.2%) for M. officinalis, palmitic acid (25.0%) and arachidic acid (17.9%) for S. libanotica subsp. linearis and linoleic acid (50.1%) and germacrene-D (15.6%) for S. thirkei, respectively. Especially, the methanol extracts of three herbal teas with low cytotoxic and toxic effects, showed strong antioxidant activities in all tested methods. To determine the active principles responsible for the antioxidant activities, phenolic components such as chlorogenic, rosmarinic, caffeic acids, rutin, quercetin, luteolin, naringenin were quantified by LC-MS/MS in the methanol extracts. Extracts with various polarities of M. officinallis, S. libanotica subsp. linearis and S. thirkei, which are consumed as tea in the world and Turkey, were prepared and these extracts were scanned in detail for chemical content and biological activity. The results of the present study showed that three herbal teas can also be used as a food source due to its high phenolic acid content and strong antioxidant properties.
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Ertaş et al. (2020) studied this question.
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