Sürdürülebilir Kalkınma Amaçları

• 5
• 2
• 1

• MakaleAçık Erişim2025Scopus SJRQ1/r/munzur/1179
  Green Synthesis of Multi-Walled Carbon Nanotube-Reinforced Hydroxyapatite Doped with Silver and Silver-Core Selenium-Shell Nanoparticles: Synthesis, Characterization, and Biological Activity

  Unal, İlkay

  Hydroxyapatite (HAp) is widely used in biomedical applications due to its biocompatibility, osteoconductivity, and bioactivity. However, its low mechanical strength, tendency toward rapid corrosion, and lack of bactericidal properties present significant limitations in applications. This study aimed to improve the properties of HAp by reinforcing it with multi-walled carbon nanotubes (MWCNTs) and doping it with silver nanoparticles (AgNPs) and silver-core selenium-shell nanoparticles (Ag@SeNPs). Ocimum basilicum extract was used as both a reducing and stabilizing agent in the synthesis of nanoparticles using an environmentally friendly and non-toxic method as an alternative to traditional methods. The synthesized HAp, HAp/MWCNT, Ag-HAp/MWCNT, and Ag@Se-HAp/MWCNT nanocomposites were characterized by TEM, SEM, XRD, Raman spectroscopy, and BET analysis. BET analysis showed a reduction in surface area from 109.4 m2/g for pure HAp to 71.4 m2/g, 47.5 m2/g, and 35.3 m2/g for HAp/MWCNTs, Ag- HAp/MWCNTs, and Ag@Se-HAp/MWCNTs, respectively. Antimicrobial activities against P. aeruginosa, E. coli, S. aureus, E. faecalis, and C. albicans were evaluated. HAp and HAp/MWCNT did not show any antimicrobial activity, while Ag-HAp/MWCNTs showed inhibition zones of 14 mm for Escherichia coli and 18 mm for Pseudomonas aeruginosa at 5 mg/mL. Ag@Se-MWCNTs/HAp exhibited superior efficacy with inhibition zones of 18 mm, 12 mm, and 20 mm for S. aureus, E. faecalis, and Candida albicans, respectively. The incorporation of Ag@SeNPs enhanced HAp’s antibacterial and antifungal properties through a synergistic mechanism.

  • 
  AtıfScopus12·WoS10·OpenAlex12

  İncele
• MakaleYalnız künye2024Scopus SJRQ3/r/munzur/4548
  Biosynthesis of silver nanoparticles using the aqueous extract of Rheum ribes, characterization and the evaluation of its toxicity on HUVECs and Artemia salina

  Unal, Ilkay; Egri, Sinan

  This study describes an eco-friendly procedure to synthesize silver nanoparticles (AgNPs) using fresh and dried stem extract of Rheum ribes. AgNPs formation was confirmed using UV-vis spectrometry. The effects of parameters such as temperature, reaction time, pH, AgNO3 concentration, and plant extract/AgNO3 ratio on NP formation were evaluated. Morphology and structural features of the particles were characterized using SEM, TEM, XRD, and FTIR. The average size, polydispersity index, and zeta potential were determined using DLS. After characterization, among the two AgNP samples, selected one; AgNP sample synthesized by dried Rheum ribes stem extracts (d-AgNPs), which exhibited narrow size distribution and high surface plasmon resonance in the range of 435-445 nm for toxicity assessment. The cytotoxic effect of d-AgNPs on HUVECs cells was evaluated with MTT analysis. Accumulation measurements were made in three periods as 24, 48, and 72 h and elimination values were examined at +24 h using ICP-MS analysis

  AtıfWoS6·OpenAlex6

  İncele
• MakaleAçık Erişim2024/r/munzur/6329
  Evaluation of the Effect of Different Extraction Temperatures on the Synthesis of Silver Nanoparticles from Ocimum basilicum (Basil) Plant

  Aydogdu, Burcu; Unal, Ilkay

  The eco-friendly green synthesis of silver nanoparticles (AgNPs) using Ocimum basilicum (basil) extract at varying extraction temperatures (40°C, 60°C, 80°C, 100°C) was investigated to determine the optimal conditions for nanoparticle formation. Analysis methods such UV-Vis spectrophotometry, Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), and TransmissionElectron Microscopy (TEM) confirmed the crystalline, spherical nature of AgNPs and identified phytochemicals acting as capping and reducing agents. Notably, the extraction temperature was found to influence both the DPPH radical scavenging activity and the structural properties of AgNPs. According to TEM analysis results, it was observed that high extraction temperatures increased the nanoparticle formation efficiency but created a wide size distribution. The crystallite sizes, calculated using the Scherrer equation, for AgNPs synthesized at different extraction temperatures, were determined to be 12.45 nm, 18.77 nm, 17.76 nm, and 16.03 nm, respectively. The hydrodynamic sizes of the AgNPs were found to range between 158.1 and 333.7 nm. The study highlights the critical role of extraction temperature in the synthesis process, suggesting 40°C as the optimal temperature for achieving efficient and environmentally friendly synthesis of AgNPs with enhanced biological activities.

  AtıfOpenAlex4·TR Dizin1

  İncele
• MakaleAçık Erişim2024/r/munzur/6267
  Biogenic Synthesis, Characterization and Degradation of Methylene Blue Dye of Zinc Oxide Nanoparticles from Different Zinc Salts Using Cinnamomum verum Extract

  Aydogdu, Burcu; Unal, Ilkay

  In this study, zinc oxide nanoparticles (ZnONPs) were synthesized using Cinnamomum verum extract from different zinc salts such as zinc acetate, zinc nitrate, zinc sulfate, and zinc chloride. The synthesized ZnONPs were characterized using X-ray diffraction (XRD), dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FT-IR), and transmission electron microscopy (TEM). Additionally, The photocatalytic activities of ZnO nanoparticles were tested in the presence and absence of sunlight. Cinnamomum verum extract was analyzed for DPPH radical scavenging activity and total phenolic content (TPC). The study results showed that the type of zinc salt used significantly affects the morphology, size, and crystal structure of the ZnO nanoparticles. ZnONPs synthesized from zinc acetate (ZnONPsA) showed superior photocatalytic activity in the presence and absence of sunlight.

  AtıfOpenAlex1

  İncele
• MakaleAçık Erişim2024/r/munzur/5725
  Comparison of Characteristics and Antimicrobial Activity of Synthesized Zinc Oxide And Magnetite Iron Oxide Nanoparticles Using Four Different Plant Extracts

  Aytar, Mehmet; Aydogdu, Burcu; Unal, Ilkay

  The aim of this study was to synthesize Zinc oxide (ZnO) and magnetite ıron oxide (Fe3O4) nanoparticles utilizing a precipitation method, employing plant extracts from Ocimum basilica(1), Cinnamomum zeylanicum(2), Lactarius salmonicolor(3) and Paeonia kesrouanensis(4) as reduction and stabilizing agents. Additionally, the antimicrobial activity of these nanoparticles against both gram-positive (S. aureus, ATCC 25923) and gram-negative (E. coli, ATCC 25922; P. aeroginosa, PAO1), bacteria as well as fungus (C. albicans 90028) was evaluated. The nanoparticles (NPs) were characterised by various analyses, including TEM, SEM, XRD, FTIR, DSL, and zeta potential. Based on the TEM image, the ZnONPs exhibited a cluster of flower-like structures, whereas the Fe3O4NPs displayed a spherical shape with a varying size distribution. The zeta potential values for ZnO NPs ranged from -5.35 to -16.9, while for Fe3O4NPs ranged from -7.43 to -20.7. All ZnO nanoparticles exhibited antimicrobial activity exclusively against the S. aureus strain, whereas Fe3O4NPs did not demonstrate any antibacterial effect.

  • 
  AtıfOpenAlex4·TR Dizin1

  İncele
• MakaleYalnız künye2024Scopus SJRQ2/r/munzur/2272
  Plant extract-based biosynthesis of silver nanoparticle and silver–zinc nanocomposites-doped hydroxyapatite and its antimicrobial activity

  Unal, Ilkay; Aydoğdu, Burcu; Aytar, Mehmet

  Hydroxyapatite (HAp) is an essential material in the biomedical field because of its chemical composition, similar to the apatites found in bones. The lack of bactericidal properties of HAp-based materials cannot prevent the adhesion and growth of bacteria. However, it can develop composite biomaterials using nanoparticles (NPs) such as silver (Ag) and zinc (Zn), which exhibit biocidal behaviours to control resistant microorganisms. This study aimed to prepareHAp–AgNPs and HAp–Ag@ZnNPs nanocomposite and evaluate their antimicrobial properties against Gram-positive and Gram-negative bacteria. HAp powders were produced from sheep bone. An aqueous extract of Marrubium astracanicum was used as a reducing and stabilising agent for the synthesis of NPs. The composites were characterized by XRD, SEM–EDX, SEM and FTIR. In vitro biocompatibility assessment was determined by agar well diffusion tests. The HAp–Ag@ZnNPs nanocomposites showed stronger antimicrobial activity than HAp–AgNPs against bacteria and fungi, while pure HAp did not show any effect.

  • 
  AtıfScopus6·WoS5·OpenAlex4

  İncele
• MakaleAçık Erişim2024Scopus SJRQ3/r/munzur/2236
  The effects of biosynthesized silver nanoparticle on oxidative stress parameters in model organism Artemia salina (Linnaeus, 1758)

  Ünal, İlkay; Ertürk Gürkan, Selin

  Evaluation of the effects of nanomaterials in various habitats and living groups is increasing with in vitro and in vivo studies. This study aims to describe a biological procedure to synthesize silver nanoparticles using an extract of Marrubium astracanicum and to determine the aquatic environment’s oxidative stress on Artemia salina. Silver nanoparticle formation was visually observed with color change. Its structural properties, such as size, shape, morphology, and stability, were characterized by UV-Vis spectrophotometer, TEM, SEM, XRD, and DLS analyses. TEM image showed that the synthesized AgNPs have a size of between 20 and 50 nm. The effects of biosynthesized silver nanoparticles at different concentrations (control,0.2, 1, 5, 10, 25, and 50 mg/mL) and exposure times (24, 48 and 72 h) on total glutathione (GSH) and lipid peroxidation levels (MDA) were investigated on the Artemia salina organism, which is one of the most common saltwater organisms frequently used in ecotoxicity tests.

  AtıfScopus4·WoS2·OpenAlex3

  İncele
• MakaleYalnız künye2024Scopus SJRQ3/r/munzur/2106
  Functionalized and Ag-Loaded Nano-Delivery System for Doxorubicin: Loading, Controlled Release and Kinetic Studies

  Aydogdu, Burcu; Kaplan Ince, Olcay; Ince, Muharrem; Unal, Ilkay

  Multi-walled carbon nanotubes (fMWCNTs) that functionalized and loaded Ag nanoparticles (AgNPs) were investigated to adsorp doxorubicin hydrochloride (DXR). DXR release behavior efficiency was determined using kinetic studies. DXR agent was treated into fMWCNTs@AgNPs material with different drug loading rates. The material was successfully established and characterized using transmission electron microscopy, and fourier transform–infrared spectroscopy. Thermogravimetric analysis was performed to elucidate the effect of temperature on mass loss and X-ray diffraction analysis was systematically assessed the crystalline state of DXR. Various kinetic models including Higuchi, Baker Hixson-Crowell, and power-law were applied. It was revealed that DXR has more binding affinity to the fMWCNTs@AgNPs material system surface as a nanocarrier at pH 7.4 and showed more release at pH 5.0. Functionalized material confirmed its efficiency as pH-based drug delivery system. Used material can be utilized as promising nanocarriers, and findings will contribute to the rational design of novel delivery tools for drugs.

  • 
  İncele
• MakaleYalnız künye2024Scopus SJRQ3/r/munzur/2003
  Biogenic Silver and Zinc Enhanced MWCNTs: Nano-Decoration, Characterization, and Antimicrobial Effect

  Ünal, İlkay

  In this study, acid-treated multi-walled carbon nanotubes (MWCNTs) were decorated with silver (Ag), zinc (Zn), and Ag@Zn nanoparticles (NPs) synthesized using plant extract for reducing and stabilizing NPs. The nanocomposites were characterized by Scanning electron microscopy (SEM)-energy-dispersive X-ray spectroscopy (EDX), Transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, and Thermogravimetric analysis (TGA). The stability of functionalized MWCNTs (f-MWCNTs) and NP-decorated MWCNTs was visually evaluated for seven days in ethanol. The antimicrobial efficacy against Gram-positive (Staphylococcus aureus), Gram-negative (Pseudomonas aeruginosa, Escherichia coli) bacteria, and fungi (Candida albicans) was determined using the agar well diffusion assay. Results indicated that Ag-MWCNTs and Ag@Zn-MWCNTs nanocomposites exhibited superior antimicrobial activity against P. aeruginosa and C. albicans compared to other tested microorganisms. Conversely, f-MWCNTs and Zn-MWCNTs showed no antimicrobial effects.

  • 
  AtıfScopus1·WoS1·OpenAlex1

  İncele
• MakaleAçık Erişim2024Scopus SJRQ1/r/munzur/1922
  Assessment of toxicity and oxidative stress induced by rare earth oxide nanoparticles in brine shrimp (Artemia salina)

  Unal, Ilkay; Erturk Gurkan, Selin; Aydogdu, Burcu

  This study meticulously explored the oxidative stress effects induced by lanthanum (III) oxide (La2O3), erbium (III) oxide (Er2O3), and yttrium (III) oxide (Y2O3) nanoparticles on Artemia salina, with the objective of evaluating the environmental toxicity of rare earth oxide nanoparticles. The characterization of the nanoparticles was conducted using a suite of advanced techniques, including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), dynamic light scattering (DLS), and zeta potential analysis. Artemia salina, a widely recognized model organism in ecotoxicological research, was exposed to these nanoparticles under meticulously controlled laboratory conditions. The investigation focused on quantifying oxidative stress markers, such as reduced glutathione (GSH), malondialdehyde (MDA), and antioxidant enzymes including catalase (CAT), superoxide dismutase (SOD), and glutathione-S-transferase (GST). The findings revealed significant alterations in these biomarkers, indicating nanoparticle-induced oxidative stress, which varied according to the type of nanoparticle and the duration of exposure.

  AtıfScopus9·OpenAlex9

  İncele