Browsing by Author "Okumus, E."

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Evaluation of Antioxidant, Antibacterial and Thermal Stability Properties of Silver Nanoparticles Synthesised With Infundibulicybe Gibba Extract
(Springer, 2025) Meydan, I.; Seckin, H.; Kocak, Y.; Okumus, E.; Bekmezci, M.; Sen, F.
Mushrooms have been used by people for centuries for various purposes due to their unique taste, high nutritional content and pharmacological effects. Bioactive components in the structure of mushrooms are an important biological source for the green synthesis of silver nanoparticles (AgNPs) as reducing and stabilizing agents. In this study, AgNPs/Ig were synthesized using the mushroom species Infundibulicybe gibba. The color transformation of the formed nanoparticles from yellow to brown occurred and peaked at 370 nm in the UV-Vis spectrum. The nanoparticles had amorphous shape and their molecular characterization was determined by Fourier transform infrared spectroscopy (FTIR). AgNPs/Ig was much more stable (- 50.02 mV) and its hydrodynamic diameter was much lower (216.50 nm) compared to the mushroom extract. A significant increase in the antioxidant activity (IC50 5.66 mg/ml) and thermal stability of the formed nanoparticles was determined. Lipid peroxidation inhibition of the extract and nanoparticles was measured as IC50 value of 6.75 and 5.51 mg/ml, respectively. In the antimicrobial analysis results, while the mushroom extract did not show any inhibition against the selected microorganisms, AgNPs/Ig showed a low antimicrobial activity. As a result, the synthesis of AgNPs/Ig was carried out through green synthesis, which is environmentally friendly, safe, cost-effective, easy to use and does not contain toxic chemicals, and it has been revealed that AgNPs synthesized using this mushroom species have advantageous potential for use.
Mixture of Leaf and Flower Extract of Prunus Spinosa L. Alleviates Hyperglycemia and Oxidative Stress in Streptozotocin-Induced Diabetic Rats
(Elsevier B.V., 2021) Temiz, M.A.; Okumus, E.; Yaman, T.; Keles, O.F.
Diabetes Mellitus is a global health problem that leads to various complications associated with hyperglycemia. In traditional medicine, herbal treatment is one of the alternative ways to cope with this type of disease. The aim of this study is to investigate the antidiabetic and hepato-pancreatic protective effects of the mixture of Prunus spinosa leaves and flowers (PSE) extract in streptozocin-induced diabetes mellitus. Seven random experimental groups of Wistar rats (n = 8) were created as followed; control, diabetic, PSE25, PSE50, insulin, metformin, and acarbose. α-amylase and α-glucosidase inhibitory activities of PSE were determined. Antioxidant enzymes activities and lipid peroxidation were analyzed in the liver tissue. Histopathological examination of liver and pancreas was also performed. α-amylase and α-glucosidase IC50 inhibition values of PSE were found more efficient, comparing to those of standard acarbose. While blood glucose levels severely increased in all diabetic groups, PSE25 and PSE50 treatments were effective in regulating blood glucose levels. Moreover, administration of PSE25 and PSE50 improved insulin levels compared to the diabetic group. Although increased oxidative stress in the diabetes seriously suppressed antioxidant activities, PSE25 and PSE50 supplementation significantly recuperated liver antioxidant capacity. Despite severe degenerative and necrotic changes in diabetes, these findings alleviated with PSE administrations. Moreover, PSE treatments remarkably recuperated β-cells. These results reveal that there may be an alternative way to control high blood glucose levels, which is one of the most important complications of diabetes. Furthermore, PSE can provide a protection against oxidative stress, liver and pancreatic damage by augmenting antioxidant capacity in diabetes. © 2021 SAAB
Role of Trametes Multicolor in Green Nanotechnology Based Antioxidant, Antimicrobial, Lipid Peroxidation Inhibition From Fungi To Nanoparticles
(Springer, 2024) Kocak, Y.; Okumus, E.; Meydan, I.; Seckin, H.; Bekmezci, M.; Sen, F.
Fungi as source for new-bio based materials has a wide range of potential uses in the pharmaceutical, cosmetic, and medical sectors. They contain abundant natural bioactive chemical resources. This study reports the use of Trametes multicolour (Tm) mushroom extract for the ecofriendly production of silver nanoparticles (AgNPs). The color of the mushroom extract turns dark brown after a certain period of time when combined with metal. (AgNPs/Tm) and then showed maximum absorption at 318 nm, the wavelength of the surface plasmon resonance of AgNPs. The morphology of AgNPs/Tm was spherical and an EDX peak in the 3 keV region indicated the presence of Ag atoms. The binding properties of the biocomponents involved in NPs handling and stabilising the NPs were identified using Fourier transform infrared spectroscopy (FTIR) data. The synthesized NPs exhibited much higher stability (- 37.63 mV), antioxidant activity (IC50 18.92 mg/ml) and inhibition against lipid peroxidation (IC50 7.46 mg/ml) compared to the mushroom extract. Although there was a significant decrease in the hydrodynamic diameter of the NPs, there was an increase in their thermal stability and antimicrobial activity. As a result, the existence and current potential of a new biomaterial suitable for cost-effective and large-scale production in the synthesis of AgNPs has been demonstrated for the first time.