Sürdürülebilir Kalkınma Amaçları

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• MakaleAçık Erişim2025/r/gumushane/12487
  DYE REMOVAL PERFORMANCE AND BIOLOGICAL ACTIVITIES OF IRON OXIDE NANOPARTICLES SYNTHESIZED FROM Cotoneaster sp. FRUIT EXTRACT

  Akar, Bülent; Baltacı, Cemalettin; Düzgün, Azer Özad; Karpuz, Omer; Karakullukçu, Volkan; Erdoğdu, Esma Gülbahar

  This work aimed to study the antioxidant, antibacterial, and dye adsorption capabilities of the aqueous extract of Cotoneaster sp. fruits (CFE) and iron oxide nanoparticles (CF-FeONP) green-synthesized from the CFE. CF-FeONPs were characterized using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray diffraction (XRD) analyses. The antioxidant activity of CFE and CF-FeONPs was assessed through various tests, including ABTS radical scavenging activity, DPPH radical scavenging activity, iron-reducing antioxidant power (FRAP), total phenolic content (TPC), total flavonoid content (TFC), and total antioxidant content (TAC). The CF-FeONPs had superior antibacterial and antioxidant activity compared to the CFEs. Furthermore, CF-FeONPs suppressed the growth of Gram-negative bacteria such as Yersinia pseudotuberculosis ATCC 911, Escherichia coli ATCC 25922, Proteus vulgaris ATCC 13315, and Pseudomonas aeruginosa ATCC 43288, as well as by Gram-positive bacteria like Streptococcus pyogenes ATCC 19615, Staphylococcus aureus ATCC 25923. and Bacillus subtilis ATCC 6633. The microdilution medium technique was used to determine the minimum inhibitory concentration (MIC) of CFE and CF-FeONPs against these bacteria strains. The adsorption rates of CF-FeONPs exhibited variability based on the quantity of adsorbent used and the specific dye type, whereas the lowest adsorption rate was 250 mg/L. CF-FeONPs demonstrated higher adsorption capacities for malachite green (MG) dye compared to methylene blue (MB) and phenol red (PR).

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• Yüksek Lisans TeziAçık Erişim2023/r/gumushane/21347
  Ateş dikeni (Pyracantha coccinea Roemer) meyvelerinden demir nanopartiküllerinin sentezi, antioksidan ve antimikrobiyal etkilerinin incelenmesi

  Volkan Karakullukçu

  Bitkisel ekstraktlardan yeşil sentezle üretilen metal ve metal oksit nanopartiküller biyolojik aktivite gösterme yönünden önemli bir potansiyele sahiptir. Bu çalışmada Gümüşhane Üniversitesi kampüsünde peyzaj amaçlı olarak yetiştirilmiş Ateş dikeni (Pyracantha coccinea) bitkisi meyvelerinin (tohumları ile birlikte) ekstraktlarından demir nanopartikülü sentezlenerek hem ekstraktların hem de sentezlenen demir nanopartiküllerinin antioksidan aktivite ve antimikrobiyal aktiviteleri belirlenmiştir. Sentezlenen Fe-NP'ler, Fourier Dönüşümlü Kızılötesi Spektroskopisi (FT-IR), Taramalı Elektron Mikroskobu (SEM), ve X-Işını Kırınımı (XRD) kullanılarak karakterize edilmiştir. Meyve ekstraktı ve Fe-NP'lerin antioksidan aktivite etkinlikleri ABTS●+ süpürücü etki tayini, DPPH serbest radikal temizleme aktivitesi tayini, demir indirgeyici antioksidan güç (FRAP), toplam fenolik madde içeriği (TPC), toplam flavonoid içerik (TFC) ve toplam antioksidan içerik (TAC), gibi antioksidan aktivite testleri kullanılarak belirlenmiştir. Demir nanopartikülleri antioksidan aktivite değerleri tüm aktivite belirleme yöntemlerinde ekstraktların aktivite değerlerinden daha yüksek ölçülmüştür. Meyve ekstraktı ve nanopartiküllerin antibakteriyel aktiviteleri gram negatif (Yersinia pseudotuberculosis ATCC 911, Escherichia coli ATCC 25922, Proteus vulgaris ATCC 13315 ve Pseudomonas aeruginosa ATCC43288,) ve gram pozitif (Streptococcus pyogenes ATCC 19615, Staphylococcus aureus ATCC 25923 ve Bacillus subtilis ATCC 6633) bakterilere karşı minimum inhibitör konsantrasyonu (MIK), sıvı mikrodilüsyon yöntemi kullanılarak belirlenmiştir. Antioksidan aktivite de olduğu gibi Fe-NP'ler meyve ekstraktlarına göre daha yüksek antimikrobiyal aktivite göstermiştir.

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• MakaleAçık Erişim2023/r/gumushane/20244
  Characterization, Antioxidant and Antimicrobial Activities of Iron Nanoparticles Synthesized Using Firethorn Fruit (Pyracantha coccinea Roemer) Extracts

  Düzgün, Azer Özad; Baltaci, Cemalettin; Akar, Bülent; Karakullukçu, Volkan; Karpuz, Omer

  The main focus of this study was to explore the biological activity of metal nanoparticles that were green-synthesized from firethorn fruits. Specifically, iron nanoparticles (Fe-NP) were synthesized from extracts obtained from fruits and seeds of the firethorn plant (Pyracantha coccinea) grown on Gumushane University’s campus for landscaping purposes. The antioxidant and antimicrobial properties of both extracts and synthesized iron nanoparticles were evaluated. To characterize the Fe-NPs, FT-IR spectroscopy, scanning electron microscopy (SEM), and X-Ray Diffraction (XRD) analyses were performed. The antioxidant activity of the fruit extracts and Fe-NPs was assessed using various antioxidant activity tests, including ABTS radical scavenging activity, DPPH radical scavenging activity, ferric reducing antioxidant power (FRAP), total phenolic content (TPC), total flavonoid content (TFC), and total antioxidant content (TAC). The results of all antioxidant activity tests indicated that the iron nanoparticles exhibited higher antioxidant activity than the fruit extracts. Moreover, the minimum inhibitory concentrations (MIC) of the fruit extracts and nanoparticles against Gram-negative bacteria (Yersinia pseudotuberculosis ATCC 911, Escherichia coli ATCC 25922, Proteus vulgaris ATCC 13315, and Pseudomonas aeruginosa ATCC 43288) and Gram-positive bacteria (Streptococcus pyogenes ATCC 19615, Staphylococcus aureus ATCC 25923, and Bacillus subtilis ATCC 6633) were determined the using the medium microdilution procedure. Similar to the antioxidant activity findings, the Fe-NPs demonstrated stronger antimicrobial activity compared to the fruit extracts.

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