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    Antimicrobial activity and chemical composition of coriander & galangal essential oil
    (Association of Pharmaceutical Teachers of India, 2017) Özkınalı, Sevil; Şener, Nesrin; Gür, Mahmut; Güney, Kerim; Olgun, Çağrı
    Essential oils were obtained from Coriandrum sativum and Alpinia officinarum through steam distillation method in this study. Antimicrobial activities of the obtained essential oils were investigated by using minimum inhibitory concentration (MIC) test by against 18 different species microorganisms. It was found that the C. sativum had strong antimicrobial activities against the 14 tested microorganism and A. officinarum oils showed strong antimicrobial activity against the 7 tested microorganisms. Furthermore, the contents of the essential oils were determined with GC-MS analyses. The most abundant compounds of essential oils of A. officinarum and C. sativum were determined as 28.4% eucalyptol and 69.4% linalool. As a result, it can be easily said that the essential oils of C. sativum and A. officinarum can be used as antimicrobial protector in related fields. © 2017, Association of Pharmaceutical Teachers of India. All rights reserved.
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    Determination of antimicrobial activity and chemical composition of pimento & ginger essential oil
    (Association of Pharmaceutical Teachers of India, 2017) Şener, Nesrin; Özkınalı, Sevil; Gür, Mahmut; Güney, Kerim; Özkan, Osman Emre; Khalifa, Moustafa Milad
    The essential oil was obtained from pimento (Pimenta racemosa Mill.) and ginger (Zingiber officinale Rosc.) through hydrodistillation method. The chemical composition of pimento and ginger essential oils were analyzed by GC-MS. It was found that the most abundant components were methyleugenol (52.33%) and zingiberene (16.32%) in essential oils of pimento and ginger, respectively. The antimicrobial activities of essential oils were investigated against 18 microorganisms with minimum inhibitory concentration (MIC) method. While pimento essential oil behaved strong antimicrobial against all bacteria apart from S. epidermidis, ginger essential oil exhibited poor activity against all bacteria. As a result of this study; it can be suggested that pimento essential oil is a preservative in the medicinal application and food industry. © 2017, Association of Pharmaceutical Teachers of India. All rights reserved.
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    Synthesis and characterization of 1,3,4-thiadiazole compounds derived from 4-phenoxybutyric acid for antimicrobial activities
    (Elsevier B.V., 2018) Muğlu, Halit; Şener, Nesrin; Mohammad Emsaed, Hamza Ahmet; Özkınalı, Sevil; Özkan, Osman Emre; Gür, Mahmut
    New 1,3,4-thiadiazole compounds were synthesized through the cyclization reaction of 4-phenoxybutyric acid and N-phenylthiosemicarbazide derivatives with phosphorous oxychloride. The structures of 1,3,4-thiadiazole compounds (I–XII) were clarified using spectroscopic methods such as FT-IR, 1H NMR, and 13C NMR. Moreover, their antibacterial activities were tested against gram negative bacteria (Salmonella enteritidis, Salmonella typhimurium, Enterobacter aerogenes, Salmonella infantis, Salmonella kentucky, Escherichia coli) and gram positive bacteria (Staphylococcus aureus, Bacillus subtilis, Enterococcus durans) using a disk diffusion method. An antifungal activity experiment was further carried out against Candida albicans using the disk diffusion method. While these compounds presented antibacterial activity against S. aureus, they did not show antimicrobial activity against gram negative (E. coli, E. aerogenes, S. kentucky, S. enteritidis, S. typhimurium, S. infantis) and gram positive (B. subtilis) bacteria, and the fungi C. albicans. © 2018 Elsevier B.V.
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    Synthesis of new azo schiff bases of pyrazole derivatives and their spectroscopic and theoretical investigations
    (Elsevier B.V., 2018) Özkınalı, Sevil; Gür, Mahmut; Şener, Nesrin; Alkın, Satı; Çavuş, Muhammet Serdar
    New pyrazole Schiff bases containing azo groups, 4-((E)-phenyldiazenyl)-3-(4-nitrobenzylidene)-1-phenyl-pyrazole-5-amine and its series, were synthesized using the condensation reaction between p-nitrobenzaldehyde and (E)-1-phenyl-4-(phenyldiazenyl)-1H-pyrazole-3,5-diamine in the molar ratio of 1:1. The compounds were characterized using IR, UV–Vis, 1H-NMR and 13C-NMR spectroscopies. The UV–Vis spectral data were obtained in ethanol, chloroform, N,N-dimethylformamide (DMF), DMF (pH = 2) and DMF (pH = 12), which have different polarity and pH values. Meanwhile, the experimental spectral analyses were supported by the theoretical calculations based on the density functional theory (DFT) using the B3LYP/cc-pvtz level. Structural analyses, vibrational frequencies, UV, and NMR calculations were performed at the same level of the theory. In addition, via using HOMO-LUMO energies, the electrochemical quantities such as chemical hardness and electronegativity were calculated and analyzed. © 2018 Elsevier B.V.