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    Genipin Cross-linked Boron Doped Hydrogels: Evaluation of Biological Activities
    (Prints Publications Pvt Ltd, 2021) Bursali, Elif Ant; Abaci, Diler; Kizil, Murat; Yurdakoc, Muruvvet
    Genipin cross-linked/boron doped starch/polyvinily alcohol (PVA) based hydrogel (SH-GNP-B) was synthesized as a new material having antimicrobial and antioxidant activity. The prepared hydrogel was characterized by X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Thermal Gravimetric Analysis (TGA) and Scanning Electron Microscope (SEM) methods and evaluated for in vitro antimicrobial activities against selected organisms by disc diffusion tests.The antioxidant activity of the prepared hydrogels was evaluated using 2,2-diphenyl-1-picrylhydrazyl radical scavenging assays. Swelling behavior of the hydrogel was also investigated. The synthesized hydrogel was thermally stable and showed pH independent swelling tendency. SH-GNP-B hydrogel was found to have antimicrobial activities against Staphylococcus aureus, Streptecocus pyogenes, Pseudomonas aeruginosa and Bacillus subtilis microorganisms and antioxidant activities. The antimicrobial activity was improved more effectively by doping boric acid (B) to hydrogel. The hydrogel exhibited weak antioxidant activity when compared to butylated hydroxytoluene (BHT).
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    Öğe
    Synthesis, characterization and in vitro antimicrobial activities of boron/starch/polyvinyl alcohol hydrogels
    (Elsevier Sci Ltd, 2011) Bursali, Elif Ant; Coskun, Senem; Kizil, Murat; Yurdakoc, Muruvvet
    Starch/polyvinyl alcohol (PVA) hydrogel films (SF) and boron complexes of these hydrogels were synthesized with or without using glutaraldehyde as a cross-linking agent (SF-BA, SF-GA, SF-GA-BA) and characterized by using Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscope (SEM) and X-ray diffraction analysis (XRD) methods. In the preparation of the hydrogels: glutaraldehyde (GA) was used as cross-linking agent. Degree of swelling and tensile strength tests were performed for the synthesized hydrogel films. The antimicrobial activities of the films were assayed with in vitro conditions by the disc diffusion susceptibility tests for five different bacterial cultures and one fungus. Standard discs of amoxycillin/clavulanic acid (AMC), ofloxacin (OFX), netilmycin (NET), erythromycin (E) and amphotericin B (AFB) were individually used as positive controls during antimicrobial activity testes. As a result SF-GA-BA and SF-GA showed moderate antibacterial activity and anti fungal activity against tested microorganisms. However, SF-BA had no antimicrobial activity against these microorganisms. (C) 2010 Elsevier Ltd. All rights reserved.