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    Dual use of poly(3-sulfopropyl acrylate)/pectin hydrogels functionalized with silver and quantum dots for antibacterial wound care and sustained doxorubicin delivery
    (Taylor & Francis Inc, 2025) Atli, Ilknur; Ozay, Ozgur
    In this study, poly(3-sulfopropyl acrylate)/pectin hydrogels were synthesized by redox polymerization and their usability was demonstrated for two different applications. Silver nanoparticles used for the modification of the hydrogels were obtained by in-situ green synthesis in a hydrogel matrix using avocado pit extract and their antibacterial properties were investigated. In addition, hydrogels modified with quantum dots were used for the release of doxorubicin, a cancer drug. The synthesized hydrogels and composites were characterized by TEM, SEM, XRD, FT-IR, TGA and swelling tests. The p(SPA)/pectin@Ag hydrogel modified with silver nanoparticles showed strong antibacterial activity after cefazolin loading and achieved 91.6% cumulative drug release in approximately 300 h, conforming to Weibull kinetics. The p(SPA)/pectin@QD hydrogel composites modified with cadmium sulfide quantum dots exhibited high doxorubicin loading capacity and a pH-sensitive stable release profile, reaching 81.2% cumulative drug release in approximately 300 h. This behavior, which fits the Korsmeyer-Peppas model, demonstrates the suitability of the hydrogel composites for controlled chemotherapeutic drug delivery. In addition, cytotoxicity assay was performed on MCF-7 human breast cancer cells, and the cytotoxic effects of 10 and 5 mu g/mL doses were found to be 23.0 +/- 2.6% and 42.3 +/- 2.37%.
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    Enhanced antimicrobial and anticancer activities of zein protein-agarose@Au composite hydrogel for controlled release of silibinin in colon cancer therapy
    (Elsevier, 2025) Atli, Ilknur; Ilgin, Pinar; Karabayir, Elif Sultan; Ozay, Hava; Ozay, Ozgur
    In this study, biodegradable hydrogel films based on natural proteins and polysaccharides were synthesized in order to improve controlled drug release, cytocompatibility and antibacterial properties. Biosynthesized gold nanoparticles were incorporated in situ cancer drug-loaded hydrogels to enhance their antibacterial, biocompatible, and cytotoxic characteristics. Then, in order to investigate the association of silibinin drug used in cancer treatment with AuNPs, drug release profile was evaluated under different environmental conditions and release kinetics were analyzed. In addition, antibacterial effects were determined by testing on Gram-negative and Gram-positive bacteria by Disk Diffusion method. As a result, cytocompatibility of silibinin drug and AuNPs in hydrogel networks and their effects on cancer cells were determined by MTT assay using human dermal fibroblasts (CCD1079KSk) and colon cancer (HT-29) cell lines. Thus, AuNPs created a synergistic effect in cancer treatment and strengthened the effect of Silibinin on tumor cells. In addition, it was determined that it exhibited a biocompatible structure by showing minimal toxicity to healthy human skin cells. This innovative drug delivery system has the potential to offer a biomaterial-based alternative in both cancer treatment and wound dressing material with its controlled release feature.
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    Gold and silver nanoparticle decorated biocompatible and antibacterial xanthan gum/poly (HEMA-co-APTMACl) hydrogels for wound healing
    (Springernature, 2025) Kulabas, Seda Savranoglu; Atli, Ilknur; Atalay, Hazal Nazlican; Tumer, Tugba Boyunegmez; Ozay, Hava; Ozay, Ozgur
    A delayed skin wound healing process increases the risk of infection and necessitates implementing effective treatment strategies. From this perspective, biocompatible and antibacterial hydrogels stand out as innovative biomaterials that support wound healing. In this research, a semi-interpenetrating polymer network (s-IPN) strategy was used to improve the mechanical strength, cytocompatibility, and antibacterial properties of natural polysaccharide-based hydrogels. In this context, natural polymer-based XG/poly (HEMA-co-APTMACl) hydrogels were synthesized by redox polymerization reaction. The stability of metal nanoparticles was ensured by utilizing the rich polyphenol and flavonoid components of C. Orientalis. The synthesized hydrogels were in situ functionalized with biosynthesized silver (55 nm) and gold (56 nm) nanoparticles to enhance their biocompatibility and biofunctionality. Their antibacterial activity was assessed against P. aeruginosa, S. aureus, B. cereus, and E. faecalis using the disk diffusion method. Hydrogelfilm@Ag inhibited all tested bacterial strains (7.5-8.8 mm), while Hydrogelfilm@Au exhibited stronger antibacterial activity, particularly against E. faecalis (10.3 mm) and B. cereus (9.7 mm). In contrast, the Hydrogelfilm was only effective against S. aureus (7.7 mm). The hydrogel formulations were tested for cytocompatibility and wound healing potential using HUVECs. All hydrogels composites (Hydrogelfilm@Au, @Ag, and @HF) were non-toxic and exhibited enhanced biocompatibility, promoting significant cell proliferation at all tested concentrations (5-20%). In wound healing assays, Hydrogelfilm@HF achieved complete wound closure within 12 h even at a 5% concentration, demonstrating superior regenerative potential. Overall, hydrogels incorporating green-synthesized silver and gold nanoparticles demonstrated excellent antibacterial and wound-healing properties, highlighting their promise as advanced biomaterials for tissue regeneration applications.
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    Hydrogen generation from the hydrolysis of piperazine bisborane as new hydrogen carrier material catalyzed by Ru0 nanoparticles embedded in agarose biofilms
    (Pergamon-Elsevier Science Ltd, 2025) Ozay, Hava; Ilgin, Pinar; Atli, Ilknur; Ozay, Ozgur
    In this study, firstly, piperazine bisborane (PBB) was synthesized and characterized as a solid hydrogen carrier material. Subsequently, a new catalytic system, agarose hydrogel@Ru (AGH@Ru), in which nanosized Ru0 particles were homogeneously dispersed and used as a catalyst for hydrogen production from the hydrolysis of PBB, was prepared. After the structural and morphological characterization of the catalyst, for the first time in the literature, catalytic hydrogen production from the hydrolysis of PBB was initiated. As a result of catalytic hydrolysis reactions conducted under different reaction conditions, it was determined that AGH@Ru achieved 100 % efficiency in the hydrolysis reaction and produced 6 mol of hydrogen per mole of PBB. The activation parameters for the hydrolysis reaction of PBB catalyzed by AGH@Ru were calculated as Ea = 74.95 kJ mol-1, Delta H# = 72.39 kJ mol-1, and Delta S# =-77.74 J mol-1 K-1. The AGH@Ru catalytic system, with a turnover frequency (TOF) of 3.24 min-1 or 194.4 h-1 at 25 degrees C, also exhibited excellent reusability.