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    Chemical composition and biological activities of essential oils from the flowers and leaves of Celtis planchoniana KIChr.
    (Taylor & Francis Ltd, 2023) Oz, Mehmet; Ucuncu, Osman; Baltaci, Cemalettin; Fidan, M. Said; Karatas, Seyda Merve
    Most plant parts are used in traditional food and medicine. Plants are significant resources of potential phytochemicals. This study investigated the properties of essential oil, antioxidant, and antimicrobial activities of the flowers and leaves of the Celtis planchoniana plant. Based on the GC/MS-FID analysis of essential oils extracted from the flowers and leaves of C. planchoniana, 101 and 91 compounds were identified from their structures, respectively. Chemical classes with the highest percentage of compounds found in essential oils of plants were oil acids, with 31.51% in flowers, and aldehydes, with 32.89% in leaves. Hexadecanoic acid (29.94%) and (E)-2-hexenal (16.11%) compounds were determined as the main components in the plant's flowers and leaves. Among the flower and leaf samples, the highest antioxidant levels were 132.77-80.10 mg AA eq./100 mL in TAC, 17.63-118.23 mg AA eq./100 mL in ABTS, 71.41-85.15 mg GA eq./100 mL in TPC, and 15.08-15.71 mg AA eq./100 mL in DPPH capacity. According to the TFC, TPC, ABTS, DPPH, and FRAP tests conducted to determine the antioxidant properties of C. planchoniana, the essential oil obtained from its leaves demonstrated more significant antioxidant properties than the essential oil obtained from its flowers. According to the antimicrobial activity analysis, the leaf and flower essential oil samples exhibited no antimicrobial activity against the microorganisms tested.
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    COMPOSITION OF ANTIMICROBIAL AND ANTIOXIDANT ACTIVITIES AND CHEMICAL COMPONENTS OF ESSENTIAL OIL FROM FLOWERS AND LEAVES OF Pyrus elaeagnifolia Pallas IN TURKEY
    (Parlar Scientific Publications (P S P), 2022) Fidan, Muhammed Said; Oz, Mehmet; Ucuncu, Osman; Baltaci, Cemalettin; Karatas, Seyda Merve
    Gumushane region in Turkey is rich in plant diversity. The flowers and leaves of Pyrus elaeagnifolia Pall. plants that will form the basis of this research were collected from the places determined. In this study; the essential oils of flowers and leaves of P. elaeagnifolia plants were obtained by hydrodistillation method in a Clevenger type device. The chemical composition of volatile oils diluted with hexane were determined by analyzing with a GC-MS/FID instrument. The quantity of antioxidant activity of the obtained essential oils was determined by total phenolic content, free radical scavenging amounts, total flavonoid content, total antioxidant content, free radical scavenging capacity and ferric reducing antioxidant power capacity according to methods. Antimicrobial activity of essential oils was determined against 23 different microorganisms by disc diffusion method. As a result; essential oil yields in percentage are 0.44% and 0.72% in the flowers and leaves of the P. elaeagnifolia. Chemical classes with the highest percentage of compounds in essential oils of plant parts: Hydrocarbons (79.77%) and aldehydes (33.31%) were detected in the flowers and leaves of the P. elaeagnifolia. In addition, the main components found in essential oils are tricosane (36.98%-15.89%) in the flowers and leaves of the P. elaeagnifolia. The determination of antioxidant activity obtained from samples collected from plant parts was determined total phenolic substance amounts in the range of 48.57-68.32 mg GAE/100 mL, free radical scavenging amounts between 9.52-40.95 mg AA/100 mL, flavonoid substance amounts in the range of 1.34-3.95 mg QE/100 mL, total antioxidant amounts in the range of 66.93-185.10 mg AA/100 mL, free radical scavenging capacity between 23.40-81.02 mg AA/100 mL and FRAP capacity in the range of 4.20-10.50 mg FeSO4/100 mL. According to the results obtained with total phenolic content, free radical scavenging amounts, total flavonoid content, total antioxidant content, free radical scavenging capacity and ferric reducing antioxidant power capacity was determined the highest antioxidant properties in leaves of P. elaeagnifolia. According to the results of the antimicrobial activities analysis obtained from the collected samples of plant parts, it was determined that only the flowers of P. elaeagnifolia show antimicrobial activity against the microorganisms used.