Scopus İndeksli Yayınlar Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12573/395
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Article Citation - WoS: 15Citation - Scopus: 16Natural Molecule-Incorporated Magnetic Organic-Inorganic Nanoflower: Investigation of Its Dual Fenton Reaction-Dependent Enzyme-Like Catalytic Activities With Cyclic Use(Wiley-VCH Verlag GmbH, 2023-04-03) Dadi, Seyma; Cardoso, Marlon Henrique; Mandal, Amit Kumar; Franco, Octavio Luiz; Ildiz, Nilay; Ocsoy, IsmailThe functional organic-inorganic hybrid nanoflowers (hNFs) have recently attracted considerable attention due to enhanced catalytic activity and stability. The main purpose of this study is to synthesize new Fenton reagents and investigate their catalytic activity, dye degradation performance and antimicrobial activity. This magnetic gallic acid nanoflowers (FeGANF) were self-assembled via incorporating magnetic nanoparticles (Fe3O4 NPs) into gallic acid (GA) as organic part and copper(II) phosphate (Cu-3(PO4)(2)) as inorganic parts. The FeGANF were characterized by SEM, EDX, FT-IR and XRD. The peroxidase-like activity and dye degradation performance of FeGANF and GANF based on Fenton reaction in the presence of H2O2 was studied toward guaiacol as substrate, using methylene blue (MB) and congo red (CR) as a cationic and anionic dyes, respectively. FeGANF shows much high catalytic activity and decoloration efficiency (97 % for MB and 99 % for CR) because of dual active center in Fenton reaction on the surface of FeGANF. FeGANF exhibited more antimicrobial activity against Escherichia coli ATCC 25922, Staphylococcus aureus ATCC 25923, and Candida albicans ATCC 10231 than that of the GA and GANF. The results of these studies suggest that magnetic hNFs has proved to be promising Fenton reagents for biological and environmental applications including treatment of wastewater.Article Citation - WoS: 2Citation - Scopus: 3Magnetically Controlled Anisotropic Light Emission of DNA-Functionalized Supraparticles(Springer Heidelberg, 2022-08-23) Erdem, Talha; Zupkauskas, Mykolas; O'Neill, Thomas; Cassiagli, Alessio; Xu, Peicheng; Altintas, Yemliha; Eiser, Erika; O’Neill, ThomasIn this article, we show the DNA-functionalization of supraparticles, form their network, and manipulate the optical features of these networks by applying a magnetic field. We start with preparing the supraparticles (SPs) of semiconducting InP/ZnSeS/ZnS quantum dots (QDs), plasmonic silver nanoparticles, and superparamagnetic iron oxide nanoparticles. These SPs are prepared by employing azide-functionalized amphiphilic diblock or triblock copolymers as well as by using their combinations. Subsequently, we attached single-stranded DNAs to these SPs by employing copper-free click chemistry. Next, we hybridized DNA-coated QD SPs with the iron oxide SPs and formed a network. By applying a magnetic field, we restructured this network such that the iron oxide SPs are aligned. This led to an anisotropic emission from the QD SPs with a polarization ratio of 1.9. This study presents a proof-of-concept scheme to control the optical features of a self-assembled supraparticle system using an external interaction. We believe that our work will further contribute to the utilization of smart self-assembly techniques in optics and photonics.Book Part Citation - Scopus: 1Green Magnetic Nanoparticles in Enzyme Immobilization(Elsevier, 2024) Dadi, Seyma; Alrifai, Wardishan Kassem; Öçsoy, IsmailEnzymes as highly efficient biocatalysts are widely used in various biotechnological sectors including cosmetic, textile, food, and detergent. However, their practical applications can be hampered due to high expense and challenges in the extraction, separation, and purification steps. Additionally, enzymes have limited activity and stability at high temperature and different pH values. Aiming to overcome these challenges, various nanoparticles (NPs) have been used as supporting matrices and carriers for enzyme immobilization. Among the NPs, in recent years, green magnetic nanoparticles (GMNPs) have attracted great attention as ideal support material for enzyme immobilization owing to their exceptional properties, such as their easy preparation, low toxicity, biocompatibility, and lower diffusion limitation. These properties enable the immobilized enzymes on GMNPs to be used in many different applications. This chapter aims to summarize the recent developments about enzyme immobilization on magnetic nanoparticles and GMNPs and their practical applications. © 2024 Elsevier B.V., All rights reserved.