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    Alizarin Red Boyar Maddesinin Dietilaminodekstran/Epiklorohidrin (DEAE-D/ECH) Kriyojeli ile Sulu Çözeltiden Gideriminin Araştırılması
    (2021) Bucak, Celile Demirbilek; Dinç, Cemile Özdemir
    Bu çalışmada, polimerik adsorban dietilamino etil dekstran/epiklorohidrinin (DEAE-D/ECH) kriyojelinin sudan boyar madde adsorplama yeteneği araştırılmıştır.Dietilamino etil dekstran/epiklorohidrinin kriyojeli ile suda çözünen Alizarin Red boyar maddesinin etkileşim mekanizması açıklanmıştır. Adsorpsiyondan önce ve sonra yapılan FTIR analizleri ve yüzey morfolojik analizler ile adsorpsiyonun mekanizması belirlenmiştir. Dietilamino etil dekstran/epiklorohidrinin kriyojelinin saf suda (% 2630) ve Alizarin Red boyası çözeltisinde (%1678) yüksek şişme oranına sahip olduğu görülmüştür. Adsorpsiyona başlangıç boya derişiminin etkisi ve Langmuir ve Freundlich izotermlerine uygunluğu araştırılmıştır. Sonuç olarak Alizarin Red boyasının dietilamino etil dekstran/epiklorohidrinin kriyojeline adsorpsiyonunun Langmuir izotermine göre uygun olduğu belirlenmiştir.
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    Carrying system formula for eugenol encapsulation: glycodendritic polyamine dextran-G2.5, synthesis and in vitro antibacterial activity
    (Springer, 2021) Bucak, Celile Demirbilek; Kurekci, Cemil; Dinc, Cemile Ozdemir
    A novel 2.5th-generation glycodendritic polyamine dextran with 96 arms (DPADx) was synthesized by the divergent method. 2.5th-generation dendrimer was obtained from the successive triplicate Michael addition with two amidation reactions using 0.5th-generation tris(2-aminoethyl)amine (TAEA-G0.5) as the initiator core. 2.5th-generation polyamine hydrazide (PAH) was obtained from hydrazine monohydrate. Finally, dextran was conjugated with PAH and so DPADx was obtained. FTIR, H-1- and C-13-NMR, elemental analysis, GPC, XRD, SEM, TGA, DSC and dynamic viscosity were used for structural analysis of products. Loading efficiency, capacity and yield (%) of eugenol-encapsulated glycodendrimer were calculated as 70%, 84% and 35%, respectively; by using UV-Vis analysis results, antimicrobial activity against Gram-positive (Staphylococcus aureus, Listeria monocytogenes and Enterococcus cesseliflour) and Gram-negative (Escherichia coli and Salmonella Typhimurium) bacteria was proven. The current study demonstrated the usability of the novel dendritic glycopolymer as an innovative and environmentally friendly way to encapsulate and shuttle of EOs without altering sensory characteristics and the functionality of these molecules. Therefore, its commercial application is possible in a variety of fields, such as pharmaceutic and cosmetic industries.
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    Porous alginate hydrogel beads cross-linked with citric acid containing tannic acid: structural analysis, antimicrobial properties and release behavior
    (Springer, 2023) Bucak, Celile Demirbilek
    In this study, in order to combine more than one feature in a single material structure, a natural polymer sodium alginate (Na-Alg) and phenolic compound Tannic acid (TA) were combined and cross-linked with a natural compound citric acid (CA). The basis of this study is to rapidly prepare hydrogel beads from Na-Alg/TA by dropping a small organic molecule into citric acid as a crosslinking agent instead of traditional divalent metal salts such as CaCl2. Primarily, an alginate complex containing various ratios of TA was prepared. Then, alginate/TA/CA (ATC) spheres were synthesized using an ionotropic method by dripping this mixture into the CA solution. Hydrogel spheres prepared by CA crosslinking the TA/alginate complex are based on strong hydrogen bond interaction. The synthesized hydrogel beads were characterized by various methods (ATR-FTIR, XRD, SEM, TGA, and DSC) and the importance of TA incorporation into the structure was explained. The release of phenolic compound from the spheres in SIF and SGF medium was investigated. Encapsulation of TA in suitable polymeric material and studying its release are an important work for curative medicine and tissue engineering. This new material will provide a new insight for the preparation of multifunctional biocomposite spheres with antimicrobial properties, and good swelling behavior.
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    Super-flexible, moldable, injectable, self-healing PVA/B/CMC hydrogels synthesis and characterization, as potential water-retaining agent in agriculture
    (Springer, 2023) Bucak, Celile Demirbilek; Sahin, Merve Olukman
    In this study, a moldable, the injectable and self-healing poly(vinyl alcohol)/carboxymethyl cellulose (PVA/CMC) hydrogel was synthesized, cross-linked with borax (B), to produce a new type of water-retaining material in soil. This material was characterized by Fourier transform infrared spectroscopy, thermogravimetric analyses, X-ray diffraction, nanoindenter and scanning electron microscopy, and its structure was elucidated. According to the gravimetrically determined swelling results, while the PVA/B hydrogel swells by 271%, the swelling ratio increases as the CMC percentage increases in PVA/B/CMC hydrogels. The water absorption capacity of loamy soil was investigated by mixing it with hydrogel soil and PVA/B/CMC was evaluated as a water retention agent. Addition of 1.0% by weight hydrogel increased the water holding capacity of loamy soil from 48.8 to 58.8%. It was observed that the soil containing the PVA/B/CMC-2.5 hydrogel showed very good water retention. At the end of 7 days, it was observed that it lost only 51% of its water. This environmentally friendly and easily synthesized hydrogel is thought to have great application potential in agriculture for soil water conservation.
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    Tannik Asit ile Güçlendirilmiş Poli(Vinil Alkol) Hidrojel Filmlerin Sentezi ve Karakterizasyonu
    (2022) Bucak, Celile Demirbilek; Şahin, Merve Olukman
    Hidrojeller, kullanım alanlarının çeşitli olması nedeniyle fazlaca ilgi görmektedir. Bununla birlikte, mevcut hidrojellerin çoğu, mekanik enerjiyi dağıtmada ya da deformasyon altında yüksek gerilebilirliği korumada sınırlamaya sahip olması gibi nedenlerden dolayı yüksek mekanik etkilere sahip değildir. Bu çalışmada, yüksek mekanik özelliğe sahip poli(vinil alkol) (PVA)?tannik asit (TA) hidrojel fimleri, adım adım fiziksel çapraz bağlama ve doygun NaCl çözeltisinde 6 saat bekletilerek hazırlanmıştır. TA' nın birçok fonksiyonel gruba sahip olması PVA ile kolayca hidrojen bağı oluşturmasına sebep olmuştur. Bu hidrojen bağları sentezlenen PVA/TA hidrojel filmlerinin mekanik özelliklerinin daha iyi olması anlamına gelmektedir. Çeşitli oranlarda TA eklenmesi ile sentezlenen PVA bazlı hidrojel filmler FTIR analizi ile karakterize edilerek, şişme davranışları, denge su içerikleri, termal özellikleri ve mekanik özellikleri incelenmiştir. TA oranı arttıkça şişme oranının ve denge su içeriğinin düştüğü, termal özelliklerinin iyileştiği, sertlik özelliklerinin azaldığı gözlenmiştir