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    New Antimicrobial Polymeric Microspheres Containing Azomethine
    (Springer, 2022) Ülke, Eyüp; Özkan, Elvan Hasanoğlu; Nartop, Dilek; Ogutcu, Hatice
    Herein, new polymeric microspheres containing azomethine (PS-OPA, PS-OPA-Pt, PS-OPA-Ni, PS-OPA-Mn and PS- OPA-Cu) were synthesized and investigated by elemental analysis, FT-IR, SEM-EDX, TGA-DTA, UV-Vis, GPC and magnetic susceptibility. Antibacterial and antifungal activities of the synthesized polymeric microspheres were evaluated against pathogenic bacteria (Staphylococcus epidermidis ATCC12228, Bacillus cereus RSKK863, Staphylococcus aureus ATCC25923, Enterobacter aerogenes, Pseudomonas aeroginosa sp., Klebsiella pneumonia ATCC27853, Salmonella type H NCTC9018394, Proteus vulgaris RSKK96026, Escherichia coli ATCC1280) and yeast (Candida albicans Y-1200-NIH) by the well-diffusion method for potential biomedical applications. It was determined that polymeric microspheres exhibited higher inhibition effect against B. cereus, E. aerogenes, P. aeruginosa, P. vulgaris and showed higher antifungal activity than standard nystatin. [GRAPHICS] .
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    Novel α-N-heterocyclic thiosemicarbazone complexes: synthesis, characterization, and antimicrobial of properties investigation
    (Royal Soc Chemistry, 2024) Nartop, Dilek; Ozkan, Elvan Hasanoglu; Ogutcu, Hatice; Yetim, Nurdan Kurnaz; Ozdemir, Inci
    In this paper, eight novel alpha-N-heterocyclic thiosemicarbazone complexes were synthesized in search of new biologically active compounds, and characterized via organic elemental analysis, nuclear magnetic resonance spectroscopy, infrared spectra, thermogravimetric analysis, ultraviolet-visible spectroscopy, molar conductance and magnetic susceptibility measurements. The in vitro antimicrobial activity of these complexes was examined against ten disease-causing pathogens: Gram-positive bacteria (Micrococcus luteus ATCC9341, Staphylococcus epidermidis ATCC12228, Bacillus cereus RSKK863) and Gram-negative bacteria (Pseudomonas aeroginosa ATCC27853, Klebsiella pneumonia ATCC27853, Enterobacter aerogenes ATCC51342, Salmonella typhi H NCTC9018394, Shigella dysenteria NCTC2966, Proteus vulgaris RSKK96026) and yeast (Candida albicans Y-1200-NIH). The results revealed that the alpha-N-heterocyclic thiosemicarbazone compounds showed potent activity. It was observed that all thiosemicarbazone complexes were more susceptible to Gram-negative strains based on the presence of an electron-withdrawing substituent (-Br/-Cl/-F). It was determined that thiosemicarbazone Cu2+complexes showed stronger antifungal effects. In this paper, eight novel alpha-N-heterocyclic thiosemicarbazone complexes were synthesized in search of new biologically active compounds, and characterized via1H-NMR, IR, TGA, UV-Vis, molar conductance and magnetic susceptibility measurements.
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    Synthesis and antimicrobial evaluation of novel heterocyclic compounds containing thiosemicarbazone
    (Sage Publications Inc, 2025) Macit, Ahsen Zeynep; Nartop, Dilek; Ogutcu, Hatice
    Herein, six novel heterocyclic compounds containing thiosemicarbazone were obtained by the condensation reaction of thiazole with thiosemicarbazide and benzaldehyde derivatives. The structures of newly obtained thiosemicarbazone-based heterocyclic compounds were investigated by spectroscopic methods (element analysis, infrared spectra (IR), proton nuclear magnetic resonance (1H-NMR), high resolution mass spectrometry (HRMS), scanning electron microscopy and energy dispersive X-ray (SEM-EDX). The antimicrobial efficiency of the obtained thiosemicarbazone-based heterocyclic compounds was screened in vitro against some pathogenic bacteria and yeast as potential medicinal agents. New heterocyclic compounds containing thiosemicarbazone were determined to be effective in varying degrees at inhibiting the activity of the tested disease-causing pathogenic strains. The heterocyclic compounds were found to show high or moderate antimicrobial activity. It was found that the synthesized heterocyclic compounds showed high or moderate antimicrobial activity.
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    Synthesis and in Vitro Antimicrobial Evaluation of Novel Potent Bioactive Heterocyclic Compounds
    (Taylor & Francis Ltd, 2023) Macit, Ahsen Zeynep; Hasanoglu Ozkan, Elvan; Ogutcu, Hatice; Nartop, Dilek
    In the present work, the antibacterial and antifungal properties of six new heterocyclic Schiff bases (HSb1, HSb2, HSb3, HSb4, HSb5, HSb6) were evaluated as potential bioactive compounds against the disease-causing pathogenic microorganisms (S.epidermidis, S.aureus, B.cereus RSKK863, E.aerogenes, P.aeroginosa sp., K. pneumonia, S. type H, P.vulgaris, E. coli and (C.albicans Y-1200-NIH). The well-diffusion-method was used to determine the antimicrobial activity. For this purpose, heterocyclic Schiff bases were synthesized by condensation reaction of aldehyde derivatives and thiosemicarbazide derivatives. Spectral analysis techniques (organic elemental analysis, FT-IR,H-1-NMR, HRMS, SEM-EDX) were used to characterize the synthesized compounds. It was determined that all the newly synthesized heterocyclic Schiff bases exhibited sound, high or moderate inhibitory effects on the growth of selected different standard antibiotics. [Graphical Abstract]