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    Geraniol and cinnamaldehyde as natural antibacterial additives for poly(lactic acid) and their plasticizing effects
    (Walter De Gruyter Gmbh, 2020) Akgun, Mert; Basaran, Ihsan; Suner, Salih C.; Oral, Ayhan
    The main goal of this study is to prepare antibacterial poly(lactic acid) (PLA) containing cinnamaldehyde and geraniol and to evaluate the antibacterial activity and assess the changes of physical properties of the PLA films. Cinnamaldehyde- and geraniol-incorporated (10%, 20%, 30%, and 50% v/w) PLA films were prepared via solution-casting. While preparing these films, plasticizers were not added to the matrix. Antibacterial activities of these films against Escherichia coli and Staphylococcus aureus were investigated by the disk diffusion method. Thermal degradation characteristics were analyzed via thermogravimetric analysis (TGA), glass transition, crystallization, and melting temperatures, and enthalpies of the films were determined from differential scanning calorimetry (DSC) scans. Tensile strength and elongationat-break values of neat PLA and antibacterial-compound-containing films were evaluated and compared after the mechanical tests. Moreover, the changes in the polymer morphology were observed by SEM analysis, and opacity of the films was determined by UV-vis spectroscopy. Our results showed that both compounds provided antibacterial effect to the PLA, with cinnamaldehyde being more effective than geraniol. Moreover, plasticization effects of the compounds were confirmed by DSC analysis.
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    Grafting of poly(?-caprolactone) on electrospun gelatin nanofiber through surface-initiated ring-opening polymerization
    (Taylor & Francis As, 2018) Basaran, Ihsan; Oral, Ayhan
    Gelatin-polycaprolactone hybrid materials are being used in medicinal applications such as drug delivery, tissue engineering applications nowadays. In this study, gelatin-polycaprolactone graft copolymer was synthesized through ring-opening polymerization process instead of conventional grafting methods using potentially cytotoxic crosslinkers, or applying plasma, aminolysis reactions. Gelatin nanofiber (GNF) was produced by electrospinning process before immobilization of poly(epsilon-caprolactone). Ring-opening polymerization of epsilon-caprolactone was successfully initiated on the surface of GNF using tin(IV) isopropoxide and gelatin (primary amine functional groups) as an initiator and a coinitiator, respectively. The growing of polymer chains on GNF was indicated by both scanning electron microscope and energy-dispersive X-ray spectroscopy. Chemical structure was characterized through infrared spectrum, thermal behaviors and the material composition was analyzed with thermogravimetric analysis, wettability and hydrophilicity were determined by water contact angle measurements. [GRAPHICS] .
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    Preparation of Poly(lactic acid) Nanocomposite via Catalyst-Modified Montmorillonite
    (Taylor & Francis Inc, 2015) Basaran, Ihsan; Oral, Ayhan
    Biopolymer nanocomposite of polylactic acid was synthesized from lactic acid using tin ions exchanged Cloisite Ca++. The tin molecules between the Cloisite Ca++ layers catalyzed the lactic acid polymerization and also this clay played a role as a nanofiller. Presence of tin molecules increased the molecular weight of the polymer compared with the polymer that was synthesized with the presence of just Cloisite Ca++. Both exfoliated and intercalated nanocomposite structures were observed as the results of X-ray diffraction analysis and transmission electron microscopy images. Also, changes of polymer's thermal degradation and other thermal properties such as glass transition temperature, melting temperatures were investigated via thermogravimetric analysis and differential scanning calorimetry.
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    SULFATED POLYSACCHARIDES FROM GREEN SEAWEED Codium Tomentosum FROM CANAKKALE STRAIT (TURKEY)
    (Parlar Scientific Publications (P S P), 2022) Turker, Gulen; Ak, Ilknur; Basaran, Ihsan; Keklik, Seren
    The polysaccharide extraction and structural characterization of Codium tomentosum from green algae were investigated in this project. After extraction using acetone and dichloromethane, it was purified with a phosphate buffer to obtain a highly purified Codium tomentosum polysaccharide (CTPS). The structure of CTPS was characterized by high-performance liquid chromatography (HPLC), ultraviolet-visible (UV), Fourier transforms infrared (FTIR), and nuclear magnetic resonance ((HNMR)-H-1) spectrum. Additionally, the DPPH free scavenging activity of CTPS was also examined. Our results determined that purified extract includes L-Arabinose, L-Rammnose, L-Fructose, L-Mannose, L-Galactose, and L-Fucose. Furthermore, it was found that CTPS has free radical scavenging activity. The results showed that the polysaccharide obtained from Codium tomentosum could be applied as a potential natural source.
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    Synthesis and Characterization of Poly(L-Lactic acid)/Clay Nanocomposite via Metal-Free Process
    (Taylor & Francis Inc, 2013) Basaran, Ihsan; Oral, Ayhan
    Biopolymer nanocomposite was synthesized using metal-free catalyst which is Montmorillonite-K10 as organic filler and acid catalyst for polymerization of L-Lactic acid. To evaluate the effect of Montmorillonite onto polymer properties, 1, 3 and 5% clay were used. Products were characterized using X-ray diffraction and transmission electron microscopy. Thermal parameters of products were investigated via differential scanning calorimeter and thermo-gravimetric analyzer. Thermal stability, degree of crystallinity, temperatures for glass transition, crystallization and melting of the nanocomposites were studied. Effect of clay onto molecular weight was investigated via gel permeation chromatography. It was found that properties of polymer were influenced by addition of clay.