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  • Küçük Resim
    Öğe
    Assessment of antimicrobial and antioxidant activities of nepeta trachonitica: Analysis of its phenolic compounds using HPLC-MS/MS
    (MDPI, 2017) Köksal, Ekrem; Tohma, Hatice; Kılıç, Ömer; Alan, Yusuf; Aras, Abdülmelik; Gülçin, İlhami; Bursal, Ercan
    Continuing our work on the sources of natural bioactive compounds, we evaluated the antimicrobial and antioxidant activities of Nepeta trachonitica as well as its major phenolic content using the high-performance liquid chromatography-mass spectrometry/mass spectrometry (HPLC-MS/MS) technique. For antioxidant activity, ferric reducing antioxidant power (FRAP) and cupric ion reducing antioxidant capacity (CUPRAC) methods were performed to measure the reducing power and 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay was employed to evaluate the radical scavenging activity of the sample. For antimicrobial activity, three Gram-positive and four Gram-negative microbial species as well as three fungi species were tested. N. trachonitica appeared to have reasonable antioxidant activity and decent antimicrobial activity as indicated by the inhibition of the organisms’ growth. The most susceptible species were Bacillus subtilis ATCC 6633 and Escherichia coli ATCC 11229 among the organisms tested. Ethanol extract of the plant has the highest effect on Saccharomyces cerevisiae but no effect on Yarrowia lipolytica. The HPLC-MS/MS analysis showed that at least 11 major phenolic compounds of N. trachonitica exist, the major ones being rosmarinic acid, chlorogenic acid and quinic acid. The obtained results suggest that N. trachonitica could be a promising source for food and nutraceutical industries because of its antimicrobial and antioxidant properties and phenolic compounds.
  • Küçük Resim
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    A biochemical approach for hedysarum candidissimum from Turkey: Screening phytochemicals, evaluation of biological activites, and molecular docking study
    (Wiley-V C H Verlag Gmbh, 2022) Altay, Ahmet; Yeniçeri, Esma; Taslimi, Parham; Tok, Tuğba Taşkın; Yılmaz, Mustafa Abdullah; Köksal, Ekrem; 0000-0002-3171-0633; 0000-0002-0064-8400; 0000-0002-4090-7227; 0000-0002-1026-972X; 0000-0001-8120-8900
    This study was designed to screen the phytochemical composition and investigate the biological activities of Hedysarum candidissimum extracts and also support the results with molecular docking studies. LC/MS/MS analysis revealed the presence of 22 phytochemical constituents (mainly phenolic acids, flavonoids, and flavonoid glycosides) in the plant structure. The methanol extract exhibited the strongest antioxidant activity among all the extracts with its strong DPPH radical scavenging and iron reducing capacity, as well as high phenolic and flavonoid contents. Additionally, it was found to be the most promising acetylcholinesterase (AChE: IC50: 93.26 mu g/mL) and alpha-glycosidase (AG: IC50: 28.57 mu g/mL) inhibitory activities, supported by the major phenolics of the species through in silico studies. Ethyl acetate extract had the strongest cytotoxic effect on HT-29 (IC50: 63.03 mu g/mL) and MDA-MB-453 (IC50: 95.36 mu g/mL) cancer cell lines. Both extracts exhibited considerable apoptotic and anti-migrative effects on HT-29 cells. The investigations provide phyto-analytical and bio-pharmacological results which can be extended by in vivo studies in the future.