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https://hdl.handle.net/20.500.12713/1656

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Development of mucoadhesive modified kappa-carrageenan/pectin patches for controlled delivery of drug in the buccal cavity
(Wiley, 2021) Özkahraman, Bengi; Özbaş, Zehra; Yaşayan, Gökçen; Püren Akgüner, Zeynep; Yarımcan, Filiz; Alarçin, Emine; Bal Öztürk, Ayça
In this study, modified kappa-carrageenan/pectin hydrogel patches were fabricated for treatment of buccal fungal infections. For this purpose, kappa-carrageenan-g-acrylic acid was modified with different thiolated agents (L-cysteine and 3-mercaptopropionic acid), and the thiol content of the resulting modified kappa-carrageenan was confirmed by elemental analyzer. Then, the hydrogel patches were fabricated, and characterized by Fourier-transform infrared spectroscopy, thermogravimetric analysis, ex vivo mucoadhesion test, and swelling behavior. Triamcinolone acetonide was added either directly or by encapsulating within the poly(lactic-co-glycolic acid) nanoparticles. The release amount of the drug from the directly loaded patch was 7.81 mg/g polymer, while it was 3.28 mg/g polymer for the encapsulated patch with the same content at 7 hr. The hydrogel patches had no cytotoxicity by cell culture studies. Finally, the drug loaded hydrogel patches were demonstrated antifungal activity against Aspergillus fumigatus and Aspergillus flavus. These results provide that the novel modified kappa-carrageenan and pectin based buccal delivery system has promising antifungal property, and could have advantages compared to conventional buccal delivery systems.
Layered double hydroxide-based nanocomposite scaffolds in tissue engineering applications
(Royal Society of Chemistry, 2021) İzbudak, Burçin; Çeçen, Berivan; Anaya, Ingrid; Kamal Miri, Amir; Bal Öztürk, Ayça; Karaöz, Erdal
Layered double hydroxides (LDHs), when incorporated into biomaterials, provide a tunable composition, controllable particle size, anion exchange capacity, pH-sensitive solubility, high-drug loading efficiency, efficient gene and drug delivery, controlled release and effective intracellular uptake, natural biodegradability in an acidic medium, and negligible toxicity. In this review, we study potential applications of LDH-based nanocomposite scaffolds for tissue engineering. We address how LDHs provide new solutions for nanostructure stability and enhancein vivostudies' success. © The Royal Society of Chemistry 2021.
Photo-crosslinkable chitosan and gelatin-based nanohybrid bioinks for extrusion-based 3D-bioprinting
(TAYLOR & FRANCIS AS, 2021) Yüce Erarslan, Elif; Tutar, Rümeysa; İzbudak, Burçin; Alarçin, Emine; Kocaağa, Banu; Güner, F. Seniha; Emik, Serkan; Bal Öztürk, Ayça
In the last decade, 3D-bioprinting has attracted attention due to its capability to produce complex scaffolds. The selection of suitable biomaterials for the bioink design is very important for the success of 3D-bioprinting. In this study, chitosan and gelatin were chemically modified into methacrylated chitosan (ChiMA) and methacrylated gelatin (GelMA) with the methacrylic anhydride in order to obtain crosslinking points on the polymeric backbone. The eligible bioinks were formulated with the layered double hydroxide nanoparticles (LDHs). The effect of changing the amount of LDHs on the printability of the bioinks was evaluated by using rheological analysis and printability test with the extrusion-based 3D-bioprinting. The bioinks were crosslinked under UV light. Mechanical, swelling, degradation properties, and cell-adhesion behaviors of the obtained ChiMA/GelMA nanohybrid scaffolds containing LDHs were investigated. Based on the rheology and the printing results, ChiMA/GelMA nanohybrid scaffold containing 5% LDHs (ChiMA-G5) was found to be the optimal bioink. Notably, compression strength, elongation at break, and elastic modulus of ChiMA-G5 scaffold were higher than neat and other ChiMA/GelMA scaffolds. In vitro cell culture studies showed that LDHs do not have any negative effects. These findings indicate that the developed ChiMA-G5 bioink has great potential as a bioink to utilize for tissue engineering applications.
Boric acid-impregnated silk fibroin/gelatin/hyaluronic acid-based films for improving the wound healing process
(Journal of Applied Polymer Science, 2021) Özen, Nurten; Özbaş, Zehra; İzbudak, Burçin; Emik, Serkan; Özkahraman, Bengi; Bal Öztürk, Ayça
Recently, with the progression in wound dressings, the importance of the biocompatible material with enhanced features for potential applications in the biomedical field has been more developed. Current strategies focus on the acceleration of the wound healing by systematically designed dressing materials. In this study, biocompatible hydrogel films with the combination of silk fibroin, hyaluronic acid and gelatin biopolymers were fabricated. To gain the enhanced wound healing behavior of wound dressings, boric acid (BA) was formulated in various ratios. The prepared hydrogel films were characterized in terms of FTIR, TGA, DSC, and SEM analysis. Following to the swelling and mechanical tests, in vitro biocompatibility and wound healing tests were performed against L929 fibroblast cell line. Results suggest that the presence of 1% (wt/vol) BA in the formulation of silk fibroin/gelatin/hyaluronic acid based hydrogel films is the key in providing such an enhanced mechanical and wound healing feature and may offer an alternative approach for wound healing treatment. © 2021 Wiley Periodicals LLC.
Aloe vera-based antibacterial porous sponges for wound dressing applications
(SPRINGER, 2021) Tamahkar, Emel; Özkahraman, Bengi; Özbaş, Zehra; İzbudak, Burçin; Yarımcan, Filiz; Boran, Filiz; Bal Öztürk, Ayça
The antibacterial sponges with high macroporosity, high interconnectivity and high biocompatibility is a significant concern for wound healing applications. In this work, novel Aloe vera (AV) based sponges were developed via subsequent lyophilization with further chemical crosslinking throughout the double network sponges. Single network was composed of gelatin-sodium alginate (G-SA) while the double network using gelatin-sodium alginate- sodium hyaluronate (G-SA-HA) was produced with the addition of hyaluronic acid solution into the gelatin-sodium alginate matrix. Lastly, Aloe vera as the bioactive agent was fabricated throughout the gelatin-sodium alginate-sodium hyaluronate matrix. The AV-based sponges demonstrated large pores with high interconnectivity. The swelling degree of the AV-based sponges were higher than that of G-SA and G-SA-HA sponges. The release of AV from the sponges reached an equilibrium value after 24 h showing a more controlled release at pH 5.5 than at pH 7.4. AV-based sponges showed antibacterial activity against Staphylococcus aureus, Enterococcus faecalis, Streptococcus pneumoniae and Bacillus cereus and displayed any cytotoxicity against Mesenchymal stem cells.
In-vitro bioactivity investigation of sol-gel derived alumina-bovine hydroxyapatite (Bha) composite powders
(Gazi Universitesi, 2020) Yelten, Azade; Karal Yılmaz, Okşan; Püren Akgüner, Zeynep; Bal Öztürk, Ayça; Yılmaz, Suat
Alumina (?-Al2O3) and hydroxyapatite (HA, Ca10(PO4)6(OH)2) are well-known for being clinically successful bioceramic materials. In this work, in-vitro biological characterization of the sol-gel alumina-bovine hydroxyapatite composite powders was realized. Alumina powders were synthesized through the sol-gel process. First, boehmite (AlOOH) sol was prepared utilizing aluminium isopropoxide (Al(OC3H7)3, AIP) as the starting precursor. Bovine hydroxyapatite (BHA) powders, which can be defined as naturally derived calcium phosphate powders were added as 10, 20, 30, and 50% wt. of AIP to each AlOOH sol. Homogeneous dispersion of the BHA powders in the AlOOH sol was managed due to employing Na-alginate as a kind of thickener. Gelation of the AlOOH-BHA mixtures was carried out at 110 ºC for 3h. After drying, AlOOH-BHA mixtures were heat-treated at 1300 ºC for 2h. Chemical, microstructural, thermal, and physical properties of the precursors/process products were characterized with X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), X-Ray Fluorescence Spectroscopy (XRF), Differential Thermal Analysis (DTA), and Scanning Electron Microscopy-Energy Dispersive Spectroscopy (SEM-EDS) analyses. Indirect MTT assay was done to evaluate the biocompatibility of the Al2O3-BHA based biocomposite extracts using the L929 cell line. It is found that all Al2O3-BHA composite extracts with varying doses of 25% and 50% had no negative effect on the cell viability. In addition, % cell viability decreased with the increasing of the extract concentration. It can be concluded that the prepared Al2O3-BHA composites can be a good candidate for biomedical applications.
İpek fibroin/polivinil alkol esaslı ilaç taşıyıcı yara örtüleri
(2020) Bal Öztürk, Ayça; Püren Akgüner, Zeynep
Bu çalışmanın amacı, potansiyel yara örtüsü olarak ilaç taşıyıcı-yeni bir karboksil modifiyeli poli(vinil alkol)-çapraz bağlı ipek fibroin esaslı hidrojel filmi (İF/PVA) geliştirmektir. Çapraz bağlı hidrojellerin hazırlanması için poli(vinil alkol) (PVA),karboksil modifiye poli(vinil alkol) (PVA-COOH) verecek şekilde süksinik anhidrit (SA) ile modifiye edilmiş, FTIR ve 1H NMR analizleri ile karakterize edilmiştir. Takiben çözücü döküm yöntemi ile 1-etil-3-(3-dimetilaminopropil) karbodiimid (EDC) ve n-hidroksisüksinimid (NHS) varlığında farklı konsantrasyonlarda PVA-COOH ve ipek fibroin (İF) esaslı bir seri hidrojel filmler hazırlanmıştır. Elde edilen filmlerin yapıları FTIR ve XRD analizleri ile karakterize edilmiş, yüzey morfolojileri optik mikroskop altında incelenmiş, şişme davranışları ve mekaniksel dayanım özellikleri belirlenmiştir. Gerçekleştirilen sitotoksisitetestleri ile sentezlenen İF/PVA membran yara örtülerinin toksik olmadığı bulunmuştur. Optimum özelliklere sahip İF/PVA hidrojel filmine model ilaç olarak kuersetin yüklenmiş, etken madde yüklü filmlerin fosfat tamponu ortamında (pH:7,4) salım davranış profili incelenmiştir. Gerçekleştirilen in vitroyara modeli (çizik testi) sonuçları, 10 güne kadarkontrollü kuersetin salım profili gösteren İF/PVA filminin potansiyel ilaç taşıyıcı bir yara örtüsü olarak kullanılabileceğini göstermiştir.
Sponge-like chitosan-based nanostructured antibacterial material as a topical hemostat
(Wiley, 2019) Bal Öztürk, Ayça; Karal Yılmaz, Okşan; Püren Akgüner, Zeynep; Aksu, Soner; Taş, Arzu; Ölmez, Hülya
In this study, chitosan/alginic acid/zinc oxide (CHI/AA/ZnO) nanostructured hydrogel sponges were fabricated by incorporating ZnO nanoparticles (<100 nm) into polymer matrix to develop a new potential biomaterial for hemorrhage control. For this purpose, the crosslinked CHI/AA/ZnO nanostructured sponges were synthesized by freeze-drying technique. Genipin was used as a crosslinker. The prepared chitosan-based sponges were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy-energy-dispersive spectroscopy analysis. The effects of ZnO content on the physicochemical characteristics of sponge-like nanostructured hydrogels were evaluated by swelling ratio in two different pH values. Physical immobilization of dexamethasone as a model drug in hydrogel matrix resulted sustained release of drug more than 3 days. Antibacterial activity of hydrogel sponges was assessed against Staphylococcus aureus. The cytotoxicity and hemostatic efficacy of crosslinked CHI/AA/ZnO sponge like-nanostructured hydrogels was evaluated in vitro and in vivo, respectively. The results of this study demonstrated that the prepared CHI/AA/ZnO nanostructured sponge had the potential to be an antibacterial topical hemostat. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47522.
Chitosan/collagen composite films as wound dressings encapsulating allantoin and lidocaine hydrochloride
(Taylor & Francis As, 2020) Yaşayan, Gökçen; Karaca, Gizem; Püren Akgüner, Zeynep; Bal Öztürk, Ayça
Chitosan/collagen composite scaffolds encapsulating allantoin and lidocaine hydrochloride were formulated in various ratios and characterized in vitro for their applications in wound healing. After fabrication, scaffolds were characterized in terms of topographical properties, surface roughness, and swelling behavior, and then their stabilities were monitored by hydrolytic and enzymatic degradation studies. Following compatibility studies among the active ingredients, drugs were encapsulated within scaffolds, and encapsulation efficiency and drug release studies were carried. Finally, in vitro cell viability and scratch wound healing assays were carried to assess scaffolds as wound dressings. Results suggest that blending of polymers with drugs changed topographical properties and surface roughness prominently. It is found that the formulation with chitosan/collagen ratio of 70/30 is more resistant to both hydrolytic and enzymatic degradation routes due to having favored properties of both collagen and chitosan. In vitro drug release studies indicated rapid release of drugs, hence the scaffolds could be advantageous for patients that need an immediate anesthetic effect in wound healing therapy. The cell culture studies demonstrated that the chitosan/collagen composite scaffolds showed no toxicity, and cell migrations were increased depending on the collagen ratio in scaffolds. These results suggest that chitosan/collagen scaffolds combined with allantoin and lidocaine hydrochloride could be a promising candidate for wound healing applications.

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