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Papers by GÜLŞİN ARSLAN

Selçuk Üniversitesi fen fakültesi fen dergisi, Nov 14, 2023

Cumhuriyet science journal, Jan 31, 2024

This article is licensed under a Creative Commons Attribution-NonCommercial 4.0 International Lic... more This article is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0) Carbon quantum dots (CQDs) derived from biological samples exhibit low cytotoxicity and are often used as fluorescent agents for bioimaging cells or bacteria. In this study, fluorescent CQDs derived from Malva sylvestris, a wild edible medicinal plant (common mallow), were used to visualize the human epithelial cells (PNT1A). CQDs with strong blue photoluminescence were synthesized by microwave irradiation of dried M. sylvestris in water. CQDs' structural, morphological, surface features and photoluminescence properties were evaluated. In vitro, cytotoxicity assays revealed that carbon quantum dots from M. sylvestris have no cytotoxic effects on human epithelial cells. Non-cytotoxic and high photoluminescent CQDs from M. sylvestris can be exploited in bioimaging applications as a fluorophore agent.

International Journal of Biological Macromolecules, Jan 31, 2024

Nanomedicine, Sep 30, 2023

Selçuk Üniversitesi Fen Fakültesi Fen Dergisi

Cuckoopint (Arum maculatum), an edible wild plant species, grows in Asia, Europe, and North Afric... more Cuckoopint (Arum maculatum), an edible wild plant species, grows in Asia, Europe, and North Africa. The aerial parts of the plant are consumed as food. The plant's tubers are used in traditional folk medicine to treat gastrointestinal disorders. When consumed fresh, the plant's tubers have a toxic effect, and the dried form is safe if it does not exceed a certain amount. Tuber powders can also have a poisonous effect when taken in excessive amounts accidentally and unconsciously. In this study, it was investigated whether it is possible to prepare the powder obtained by drying the tubers of the edible wild plant A. maculatum by encapsulating it with chitosan, an edible, biocompatible, mucoadhesive polysaccharide, in specific doses. A. maculatum-chitosan microcapsules were prepared with A. maculatum tuber powder and chitosan. The effects of medium parameters such as pH, temperature, and ionic strength on the microcapsules' structural integrity and release properties were ...

Current Analytical Chemistry, Aug 1, 2012

A fast and effective microextraction technique is proposed for the determination of trace amounts... more A fast and effective microextraction technique is proposed for the determination of trace amounts of Cr(III) in water samples, using ultrasound-assisted emulsification-microextraction (USAEME) followed by flame atomic absorption spectrometry (FAAS). In the proposed approach, sodium diethyldithiocarbamate trihydrate solution (NaDDTC.3H 2 O) was used as a chelating agent and chloroform was selected as extraction solvent. After determination of the most suitable solvent and extraction time, some effective parameters such as an extraction solvent volume, temperature, and pH were investigated and optimized. The optimized USAEME procedure used 100 L of chloroform, 20 min of extraction with no ionic strength adjustment at 50 ºC and 5 min of centrifugation at 4000 rpm. The method was applied to the analysis of tap, well, dam on industrial waste water samples and the Trace Metals in Drinking Water standards CRM-TMDV. The detection limit for Cr(III) was 0.079 g L 1 with an enrichment factor of 95, and the relative standard deviation was 2.8-1.1% (n=8, c=500 g L 1). The proposed USAEME procedure has been demonstrated to be viable, simple, rapid and easy to use for the residue analysis separation of Cr(III).

Handbook of Nanomaterials for Industrial Applications, 2018

Abstract Nanotechnology is a new and fast emerging field that involves design, manufacture, and u... more Abstract Nanotechnology is a new and fast emerging field that involves design, manufacture, and use of different structures. Owing to their small size, varying between 1 and 100 nm, they have unique properties leading them to have higher potential for both commercial and industrial applications. Nanotechnology is a dynamic field of science and new products containing nanoparticles are always coming to the market with an increasing number of commercial products. Nanomaterials are used in many products and applications, where engineered nanomaterials (ENMs) designed for use are in many commercial materials, devices, and structures, such as sunscreens, cosmetics, sporting goods, insulation materials, paints, cement, clothing, tires, electronics, self-cleaning glass, semiconductors, and food. Nanotechnology applications also extend to techniques like drug delivery, diagnosis, biomedical imaging, construction, ground water remediation, electronics, and so on. Therefore, ENMs are used either to improve the quality of present conventional products or to create completely novel products, functionalities, and applications. Among very well known nanomaterials in the market, generally they are grouped as being carbon-based nanomaterials, fullerenes, metal oxides, etc. While fullerenes are mostly preferred in applications such as superconductors, drug delivery, catalysis, and lubricants, carbon-based nanomaterials as carbon nanotubes are applied for energy and hydrogen storage, plastics and polymers. Metal nanoparticles are generally employed in catalysis for automotive industry, wound healing materials, and remediation of water/land pollution. Moreover, metal oxide nanoparticles can serve as antibacterial material, healthcare products, pigments, as well as self-cleaning surfaces. In recent years, the quantities of types of nanomaterials produced and used together with the type of products in which they are used are increasing and increasing. As a result of these high-technology products and manufacturing methods in industry, care should be taken in terms of human health and environmental.

RSC Advances, 2016

Facilitated transport of Rhodamine B through a novel polymer inclusion membrane (PIM) containing ... more Facilitated transport of Rhodamine B through a novel polymer inclusion membrane (PIM) containing CdTeSe Quantum Dots (QDs) as a carrier reagent has been investigated.

International Journal of Biological Macromolecules, Feb 1, 2018

Evaluation of antibacterial properties on polysulfone composite membranes using synthesized bioge... more Evaluation of antibacterial properties on polysulfone composite membranes using synthesized biogenic silver nanoparticles with Ulva compressa (L.) Kütz. and Cladophora glomerata (L.

Journal of The Taiwan Institute of Chemical Engineers, Jun 1, 2016

Understanding the interactions of proteins with humic acid in different media is essential for ma... more Understanding the interactions of proteins with humic acid in different media is essential for many applications. This paper investigates the interactions of bovine serum albumin with humic acid-Cu(II) complexes in a poly(hydroxyethylmethacrylate) cryogel column. Humic aggregates were immobilized within the cryogenic matrix. Protein sorption studies were conducted at different temperature, ionic strength, protein concentration, pH and flow-rate. Protein adsorption increased at lower pHs (close to the isoelectric point of the protein; 4.7) and higher temperatures but decreased at higher ionic strength and flow-rates. Both electrostatic and hydrophobic interactions played roles in the sorptive behavior of the protein molecules. Isotherm analysis showed the monolayer protein adsorption onto humic molecules immobilized column.

Materials Science in Semiconductor Processing, Apr 1, 2020

Carbon Quantum dots (CQDs) were obtained from Gingko biloba by using microwave technique, which i... more Carbon Quantum dots (CQDs) were obtained from Gingko biloba by using microwave technique, which is easy, time-saving, cost-effective, non-toxic and environmental friendly way. TiO 2 were sensitized by green-prepared CQDs to obtain CQDs/TiO 2 composite. The characterizations of the CQDs and CQDs/TiO 2 were performed by Transmission Electron Microscopy (TEM), high-resolution TEM (HR-TEM), X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopic (XPS), Photoluminescence (PL) and Fourier Transformed Infrared (FT-IR) spectroscopy. The photocatalytic hydrogen evolution activity of CQDs/TiO 2 system was studied under visible light (λ > 420 nm) irradiation in the aqueous solution by using triethanolamine (TEOA) as a sacrificial electron donor. When Pt was used as a co-catalyst, CQDs/TiO 2 /Pt exhibited improved hydrogen evolution rate (1502 μmol h À 1 g À 1) compared to CQDs/TiO 2 composite (665 μmol h À 1 g À 1).

Polymer Bulletin, Nov 20, 2019

This study reports the adsorption of Cu(II) ion by 3-(2-aminoethylamino) propyldimethoxymethylsil... more This study reports the adsorption of Cu(II) ion by 3-(2-aminoethylamino) propyldimethoxymethylsilane-modified terpolymers. Water-soluble poly(sodium 4-styrenesulfonate-co-maleic anhydride-co-acrylamide) [poly(NaSS-coMA co -AAm)] and poly(sodium 4-styrenesulfonate-co-maleic anhydride-coN -isopropylacrylamide) [poly(NaSS-coMA co -NIPAM)] terpolymers were synthesized and then modified with silane to make them water-insoluble. 1 H-NMR and FT-IR spectroscopy was used to study the chemical composition of the terpolymers. Also, acid number and viscosity of the polymers were determined. Cu(II) ion adsorption parameters (adsorbent dosage, contact time, pH and metal ion concentration) were studied, and the equilibrium data were evaluated using adsorption isotherm models; Freundlich isotherm gave the best fit. Cu(II) adsorption performance of poly(NaSSco-MA-co-AAm) and poly(NaSS-coMA co -NIPAM) terpolymers was found to be 53.42 and 43.10%, respectively. The terpolymers can be used for removal of Cu(II) from aqueous media.

Journal of Fluorescence, Jul 19, 2021

In the study, fluorescent imaging of live cells was performed using fluorescent carbon quantum do... more In the study, fluorescent imaging of live cells was performed using fluorescent carbon quantum dots derived from edible mushrooms species; Agaricus bisporus, Pleurotus ostreatus, and Suillus luteus as a fluorophore agent. Carbon quantum dots were synthesized through a facile and low-cost method based on microwave irradiation of dried mushroom samples in hydrogen peroxide solution under optimized conditions (microwave energy, solution type, duration of microwave treatment, amount of mushroom). Upon purification with centrifugation, microfiltration, and dialysis, the lyophilized carbon quantum dots were identified through UV-visible, fluorescence and FT-IR, X-ray photoelectron spectroscopy, X-ray diffraction, high-resolution transmission electron microscopy, and quantum yield calculation. Cell viability assessment of the carbon quantum dots was evaluated against human epithelial cell line PNT1A using the Alamar Blue Assay. In vitro fluorescence cell imaging studies demonstrated that the carbon dots could dynamically penetrate the cell membrane and nuclear membrane and localize in both the cytoplasm and the nucleus.

Reactive & Functional Polymers, 2016

Abstract A new chitosan/algal ( Cladophora sp.) composite microbead was produced and used in remo... more Abstract A new chitosan/algal ( Cladophora sp.) composite microbead was produced and used in removal of heavy metal ions. Bleached algal biomass was incorporated into the chitosan matrix through cross-linking with glutaraldehyde. Fourier transform infrared spectroscopy analysis demonstrated that bleached algal biomass consisted of mainly cellulosic residues. Scanning electron microscopy images exhibited that algal particles were immobilised in the polymeric matrix. Sorption capacity of the microbeads was determined; Cd(II): 0.240, Cr(III): 1.128, Cu(II): 1.059, Ni(II): 0.239 and Zn(II): 0.310 mmol g − 1 . The microbeads with bleached algal biomass exhibited higher sorption capacity for Cd(II) and Zn(II) ions than the plain glutaraldehyde cross-linked chitosan microbeads, demonstrating that the contribution of the algal biomass to the sorption. Equilibrium, kinetic and thermodynamic evaluation of the experimental data was performed. The findings revealed that chitosan–algal composite microbeads can be used in heavy metal removal.

Journal of Polymers and The Environment, May 29, 2020

This study reports ascorbic acid adsorption/release performance and antibacterial activity of chi... more This study reports ascorbic acid adsorption/release performance and antibacterial activity of chitosan composite microcapsules containing terpolymer of glycidyl methacrylate (GMA), maleic anhydride (MA) and N-tert-butylacrylamide (NTBA). The effects of amount of chitosan composite microcapsules, solution pH, ascorbic acid concentration and contact time on the adsorption of ascorbic acid by chitosan-ter (GMA-MA-NTBA) polymer microcapsules were studied. The maximum ascorbic acid adsorption was observed for 0.075 g of microcapsules under following conditions; ascorbic acid concentration: 10 mg L −1 , pH 7.35, temperature: 35 °C and contact time: 1 h. Antibacterial activity of chitosan-ter (GMA-MA-NTBA) polymer microcapsules was tested against Pseudomonas aeruginosa ATCC 27853, Escherichia coli ATCC 25113, Klebsiella pneumoniae ATCC 700603, Staphylococcus aureus ATCC 25923, Enterococcus faecalis ATCC 29212 and Salmonella enteritidis ATCC 13076 bacterial strains. In vitro antibacterial studies demonstrated that chitosan microcapsules with 0.25% ter (GMA-MA-NTBA) polymer (by mass) were more effective on inhibiting of bacterial growth. Plain glutaraldehyde-chitosan beads showed no antibacterial activity, indicating that ter(GMA-MA-NTBA) polymer content was responsible for the antibacterial activity of the chitosan-ter(GMA-MA-NTBA) polymer microcapsules.

Materials today communications, Mar 1, 2022

DESALINATION AND WATER TREATMENT, 2017

A previously validated model for direct contact membrane distillation (DCMD) was used to analyze ... more A previously validated model for direct contact membrane distillation (DCMD) was used to analyze the performance of a process for desalinating geothermal saline water. The water recovery rate for a single DCMD unit is extremely low. Using several MD units arranged in series and array patterns increases pure water production. Another advantage of the cascade structure is that most of the geothermal energy associated with brackish water is utilized. The number of units that can be used in a series pattern is determined by the temperature difference between the exit brine and inlet permeate streams of an MD unit. The number of stages that can be used in an array pattern is determined by the temperature difference between the exit permeate and brine streams through out the stage. Simulations indicated that 51% water recovery can be achieved when 40 MD units are used in an array pattern. The analysis revealed a16% increase in water recovery when the feed salinity is reduced from 3.7% to 0.2%. In addition, the gained output ratio can reach a value of 9 when the entire exit permeate stream is recycled to the MD unit as a feed stream at the expense of additional waste of heat.

Carbohydrate Polymers, Mar 1, 2019

Turkish Journal of Chemistry, 2023

Introduction Chitosan, as a versatile and functional nontoxic, renewable polysaccharide, exhibits... more Introduction Chitosan, as a versatile and functional nontoxic, renewable polysaccharide, exhibits great potential for biomedical applications, pharmaceutical preparation or products and chemical catalysis systems [1]. Many literature reviews have clearly demonstrated its unique position among the natural polymers and its superiority over some synthetic polymers in various fields [2-4]. Chitosan has received much attention in recent years due to its suitability as a functional and renewable polymeric support particularly in heterogeneous catalysis systems [5, 6]. Chitosan, which is a partially-deacetylated and watersoluble form of the parent biopolymer chitin, is obtained easily and inexpensively from hot-alkaline-treated chitin, which is an abundant structural polysaccharide occurring in many organisms including arthropods, molluscs, and fungi. A complete deacetylation of chitin is a rare case and the resulting polymeric structure, which is called chitosan, has randomly distributed β-(1,4)-linked-glucosamine and N-acetylglucosamine units [7]. Due to its cationic amino groups, chitosan can dissolve in slightly acidic aqueous medium and form gels. Through electron donating amino and hydroxy groups that it has, chitosan can interact with metal cations, act as a ligand, and form metal complexes, which offers important benefits in preparation of metallic catalysts [8]. Due to its gel-forming properties, chitosan suspensions also function as a dispersive and stabilizing medium for microsized or nanosized particles. Chitosan gel-particle composite suspensions can be moulded into fibres, beads, films, and nanoparticles [9]. Chitosan fibres in the suspensions can be covalently cross-linked through amino groups with dialdehydes, and this gives chitosan chemical and mechanical strength and prevents its dissolution in aqueous media [10, 11]. Because of the properties mentioned above, chitosan is considered an excellent support material for heterogeneous metal catalysis systems. In many studies, chitosan and chitosan derivatives were loaded with metal ions, complexes, and metallic particles and used as catalysts in organic synthesis including carbon-carbon coupling reactions (Suzuki-Miyaura and Heck reactions), oxidations, hydrogenations, and reduction reactions [5]. Metal-catalysed conversion of nitroaromatics into aromatic amines is a useful and significant synthetic route in organic synthesis and environmental remediation of organic pollutants [12]. Nitroaromatic compounds are widely used in various Abstract: Chitosan plays a crucial role in catalysis, environmental remediation, and sustainable chemistry as a renewable and cationic polysaccharide. Chitosan-based metal catalysts are used in a broad range of chemical transformations. In the study, carbon quantum dots (CQDs) were derived from Momordica charantia fruits by microwave irradiation following a green chemistry approach. Three catalysts were designed: Ag(0)-chitosan, Ag(0)-chitosan-M. charantia fruit powder, and Ag(0)-chitosan-CQDs. The catalyst supports were prepared by stabilizing CQDs or M. charantia powder within the polymeric matrix of chitosan beads. Metallic silver particles were anchored onto glutaraldehyde cross-linked chitosan beads from the aqueous solution of silver nitrate. The heterogeneous silver catalysts were used to reduce toxic nitroaromatics (4-nitrophenol, 2-nitroaniline, 1,2-diamino-4-nitrobenzene, 2,4-dinitrophenol). The regeneration of catalysts was also covered. The reused catalysts retained their catalytic activities after ten cycles. The study suggested that presence of CQDs or M. charantia powder could improve the efficiency of the chitosan-based metallic silver catalysts.

International Journal of Biological Macromolecules, May 1, 2019

chromium removal by magnetic particle-loaded micro-sized chitinous egg shells isolated from ephip... more chromium removal by magnetic particle-loaded micro-sized chitinous egg shells isolated from ephippia of water flea, International Journal of Biological Macromolecules,