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    Quantification of flavonoids isolated from Mentha spicata in selected clones of Turkish mint landraces
    (TÜBİTAK, 2018) Erenler, Ramazan; Telci, İsa; Elmastaş, Mahfuz; Akşit, Hüseyin; Gül, Fatih; Tüfekçi, Ali Rıza; Demirtaş, İbrahim; Kayır, Ömer
    Mint has been used extensively in traditional medicines, spices, and herbal teas throughout the world. Isolation of flavonoids from Mentha spicata and quantification of these compounds in selected clones of Turkish mints landraces were achieved. M. spicata was dried in shade and then boiled in water. After filtration, the aqueous extract was partitioned with ethyl acetate. The solvent was removed under reduced pressure to yield the extract, subjected to silica gel column chromatography to isolate 5-demethyl sinensetin (1), hesperidin (2), didymin (3), and linarin (4), the structures of which were elucidated by 1D NMR, 2D NMR, and LC-TOF/MS. The isolated compounds were employed as standard flavonoids to determine the quantitative variations in cultivated Turkish mint landraces belonging to Mentha × piperita L., M. spicata L., and M. × villosonervata Opiz by HPLC. The quantities of hesperidin (2), didymin (3), and linarin (4) in M. spicata were found as 11.83, 3.85, and 42.21 mg/g dried plant weight (DW), respectively, while that of 5-demethyl sinensetin (1) in M. villosonervata was 2.9 mg/g DW. Consisting of pharmaceutically valuable compounds, M. spicata and cultivated Turkish mint landraces could be a source of 5-demethyl sinensetin (1), hesperidin (2), didymin (3), and linarin (4). © TÜBİTAK.
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    Synthesis of Silver Nanoparticles From Camellia sinensis Waste and Evaluation of Their Cytotoxic Effect
    (Gh. Asachi Technical University of Iasi, 2023) Erenler, Ramazan; Tunay, Karan; Moran Bozer, Büşra
    Silver nanoparticle synthesis was achieved using waste tea produced from tea factories and investigated their anticancer activity. The waste material was heated with deionized water at 45°C and then the solution was filtrated. The filtrate was reacted with silver nitrate to yield the silver nanoparticles (AgNPs). The structure of AgNPs was determined by spectroscopic analysis. The cytotoxic effect of extract and AgNPs were performed using the human lung carcinoma cell lines (A549), colon adenocarcinoma cell lines (DLD-1), and mouse fibroblasts (L929) cell lines by MTT assay. In UV-Vis measurement, the maximum absorption was observed at 445 nm. The nanoparticles morphology was established by Transmission electron microscopy (TEM) and particle size was determined as 17.6 nm. The structure of AgNPs was presented as a face-centered cubic structure by X-ray Diffraction (XRD) analysis. The high negative value of zeta potential (-31.3 mV) displayed the stability of the nanostructure. The yield of AgNPs was calculated by elemental analysis as 72.35%. AgNPs exhibited an outstanding effect on A549 and DLD-1 cell lines at 1.0 mg/mL with the lethal effect of 89.3% and 83% respectively. AgNPs synthesized from waste tea may be promising agents for cancer treatment. Since silver nanoparticles synthesized from waste tea revealed excellent cytotoxic effects against various cancer cells. © 2023 Gheorghe Asachi Technical University of Iasi, Romania. All rights reserved.