Aktepe, Necmettin
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Aktepe, N.
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Doçent
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necmettinaktepe@gmail.com
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Department of Nursing / Hemşirelik Bölümü
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3
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8
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6
CLEAN WATER AND SANITATION
2
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9
INDUSTRY, INNOVATION AND INFRASTRUCTURE
1
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11
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2
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14
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2
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11
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114
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6
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21
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242
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23
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19
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131/1883
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2
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0
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113
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114
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6
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6
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4.91
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| Journal | Count |
|---|---|
| International Journal of Agriculture, Environment and Food Sciences | 3 |
| Medicine Science | 2 |
| Progress in Nutrition | 2 |
| Kahramanmaraş Sütçü İmam Üniversitesi Tarım ve Doğa Dergisi | 2 |
| Chemical Papers | 1 |
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Now showing 1 - 10 of 23
Article Green synthesis and antimicrobial effects of silver nanoparticles by pumpkin cucurbita maxima fruit fiber(Medicine Science, 2022) Aktepe, Necmettin; Baran, AyşeIn the present study, for the first time, green synthesis of silver nanoparticles was carried out with the extract obtained from the fibrous structure in the pumpkin Cucurbita maxima (CM) fruit. The presence of silver nanoparticles formed by the reduction of Ag+ ions was determined with the maximum absorbance values of 442.89 nm in wavelength scans made by UV-Vis spectroscopy analysis. The functional groups of the phytochemicals involved in the reduction were examined by Fourier-transform infrared (FT-IR) spectroscopy. For the morphology of the synthesized AgNPs, they were found to be uniform in spherical appearance using atomic power microscopy (AFM), transmission electron microscopy (TEM), and field emission scanning electron microscopy (FE-SEM) images. The surface charges of AgNPs were determined to be -16.4 mV by Zeta potential analysis. Their crystal structures and nano-sizes were evaluated by X-ray diffraction (XRD) data to be in cubic pattern, and their size was 21.20 nm using the Debye-Scherrer equation. AgNPs (CM-AgNPs) synthesized via CM provided growth suppression at concentrations of 1.00-0.12, 2.00-1.00, and 0.50 µg/mL on pathogen gram-positive, gram-negative strains and the fungus Candida albicans, respectively. These concentrations were effective against antibiotics and silver solution at a very low concentration.Article Synthesis, Characterization, and Evaluation of the Antimicrobial Activities of Silver Nanoparticles From Cyclotrichium Origanifolium L.(2022) Baran, M. Fırat; Keskin, Cumali; Erbay, Nazım; Aktepe, Necmettin; Baran, AyşeCyclotricium origanifolium is a plant belonging to the Lamiaceae family and is a species that grows in the Western and Southern Anatolian regions of Turkey. In our study, the antimicrobial activities of silver nanoparticles (AgNP) were investigated through Cyclotricium origanifolium plant extract. Characterization processes of the obtained AgNPs, suitable spectral analysis methods; Uv-Vis was determined by FT-IR, SEM-EDX, XRD. According to the results of the analysis, it was determined that the AgNPs were spherical in shape and had an average diameter of 17.60 nm. The antimicrobial effect of AgNPs was determined by the minimum inhibition concentration (MIC) method. Gram positive as test microorganisms; Staphylococcus aureus, Bacillus subtilis and gram negative; Escherichia coli, Pseudomonas aeruginosa bacteria, and Candida albicans fungal pathogen species were used. The suppression of microorganism growth was investigated by comparing the efficacy of standard antibiotics used in our study with AgNPs produced by the green synthesis method. It has been observed that the obtained AgNPs have a very strong effect on gram-positive B. subtilis and gram-negative E. coli bacteria, and are more effective against C. albicans than the normal antifungal drug. It was determined that the antimicrobial activity of AgNPs produced from C. origanifolium L. plants showed a stronger effect than standard antibiotics.Article Citation - WoS: 3Citation - Scopus: 4Determination of Chemical Composition and Antioxidant, Cytotoxic, Antimicrobial, and Enzyme Inhibition Activities of Rumex Acetosella L. Plant Extract(Springer int Publ AG, 2024) Kandemir, Sevgi Irtegun; Aktepe, Necmettin; Baran, Ayse; Baran, Mehmet Firat; Atalar, Mehmet Nuri; Keskin, Cumali; Khalilov, RovshanPurpose The phenolic composition, antioxidant, antimicrobial activity, enzyme inhibition activity, and cytotoxic activity potentials of the plant Rumex acetosella L. (R. acetosella) were examined in this study. Materials and Methods: The chemical composition of R. acetosella methanol extract was identified by the LC-MS/MS method. The antioxidant activity was tested using beta-carotene/linoleic acid, DPPH free radical scavenging, ABTS cation radical scavenging, CUPRAC reducing power, and metal chelating activity methods. The cytotoxic activity was determined by the MTT assay using human ovarian adenocarcinoma (Skov-3), glioblastoma (U87), human dermal fibroblasts (HDF), and human colorectal adenocarcinoma (CaCo-2) cell lines. The antimicrobial activity of methanolic extracts was tested on gram-negative (Escherichia coli and Pseudomonas aeuriginosa) and gram-positive bacteria (Staphylococcus aureus and Bacillus subtilis) using the in vitro minimum inhibition concentration method (MIC). Enzyme inhibition activity of R. acetosella methanol extract was measured spectrophotometrically against acetylcholinesterase (AChE) and glutathione S-transferase (GST) enzymes. Results: The findings showed that the major components of the methanol extract content were luteolin-7-O-glucoside (1.599 m/L), polydatin (91,024 m/L), and shikimic acid (0.773 m/L). It was determined that the extract and standard antioxidant (a-tocopherol) results in DPPH center dot, and ABTS center dot + tests performed to determine the antioxidant activity were close to each other, and this value was more effective than the standard antioxidant (alpha-tocopherol) in the CUPRAC test. These results suggested that the plant's antioxidant potential was higher when compared with reference antioxidant compounds. It was determined that the methanol extract of R. acetosella had a weaker effect on the growth of the tested microorganisms than the antibiotics used as standard. The activity of the GST and AChE enzymes was found to be severely inhibited by the methanol extract of R. acetosella. Conclusion: Based on these findings, R. acetosella L. is a medicinal and commercially beneficial plant that warrants further investigation.Article Synthesis, Characterization and Evaluation of Antimicrobial Activities of Silver Nanoparticles Obtained From Rumex Acetosella L. (sorrel) Plant(2022) Aktepe, Necmettin; Bütüner, Hafize; Baran, Ayşe; Keskin, Cumali; Baran, Mehmet FıratRumex acetosella L. (sorrel) is a plant belonging to the Polygonaceous family and is a species that grows naturally across Turkey. In this study, the characterization of silver nanoparticles (AgNPs) obtained from the Rumex acetocella L. (RA) plant using the green synthesis method was performed and their antimicrobial activities were investigated. AgNPs were successfully synthesized in the first stage of the study using plant extract taken from plant samples collected from the natural growing environment. Characterization of synthesized AgNPs was performed using appropriate analytical methods (UV-vis, FT-IR, XRD, SEM-EDX, TEM, Zeta Potential and Zeta Sizer). According to the analysis results, it was determined that AgNPs had a maximum absorbance at 476 nm wavelength, a pentagonal, hexagonal, and spherical appearance, a size of 29.16 nm, and a zeta potential of -9.88 mV. The antimicrobial activities of AgNPs were tested using the microdilution technique, in which Minimum Inhibition Concentration (MIC) values were determined on gram-positive Staphylococcus aureus, Bacillus subtilis and gram-negative Pseudomonas aeruginosa, Escherichia coli bacteria and Candida albicans fungus. It showed a very strong antimicrobial effect on C. albicans, S. aureus and P. aeruginosa. Consequently, AgNPs had stronger antimicrobial activity at low concentrations and when compared to commercial antibiotics.Master Thesis Rumex acetosella l. (kuzukulağı) bitkisinden gümüş nanopartiküllerin sentezi, karakterizasyonu ve antimikrobiyal aktivitelerinin değerlendirilmesi(Mardin Artuklu Üniversitesi, 2022) Bütüner, Hafize; Aktepe, NecmettinRumex acetosella L. (kuzukulağı), Polygonaceae familyasına mensup bir bitki olup ülkemiz genelinde doğal olarak yetişen bir türdür. Bu tez çalışmasında Rumx acetosella L. bitkisinden yeşil sentez yöntemi ile elde edilen gümüş nanopartiküllerin (AgNP) karakterizasyonu ve antimikrobiyal aktiviteleri incelenmiştir. Araştırmanın ilk aşamasında doğal yetiştiği ortamından toplanan bitki örneklerinden elde edilen bitki özütü ile AgNP'ler başarılı bir şekilde sentezlenmiştir. Elde edilen Ra-AgNP'lerin karakterizasyonu uygun analiz yöntemleri kullanılarak (UV-vis, FT-IR, XRD, SEM-EDX, TEM, Zeta Potansiyeli ve Zeta Sizer) tespit edilmiştir. Analiz sonuçlarına göre AgNP'lerin 476 nm dalga boyunda maksimum absorbans gösterdiği; beşgen, altıgen ve küresel görünüm; 29.16 nm boyut; -¬9.88 mV zeta potansiyeline sahip oldukları belirlenmiştir. AgNP'lerin antimikrobiyal aktiviteleri gram pozitif Staphylococcus aureus, Bacillus subtilis ve gram negatif Pseudomonas aeruginosa, Escherichia coli bakterileri ile Candida albicans mantarı üzerinde MİK (Minimum İnhibisyon Konsantrasyonu) değerlerinin belirlendiği mikrodilüsyon yöntemi ile tespit edilmiştir. Sonuç olarak Ra-AgNP'lerin hem düşük konsantrasyonlarda hem de ticari antibiyotiklere kıyasla daha güçlü antimikrobiyal aktivite gösterdiği belirlenmiştir.Article Citation - WoS: 4Citation - Scopus: 4Morin Attenuates Arsenic-Induced Toxicity in 3t3 Embryonic Fibroblast Cells by Suppressing Oxidative Stress, Inflammation, and Apoptosis: in Vitro and Silico Evaluations(Oxford Univ Press, 2024) Unsal, Velid; Cicek, Mustafa; Aktepe, Necmettin; Oner, ErkanThis study aims to investigate the curative effects of Morin, a flavonoid, against arsenic toxicity in 3T3 embryonic fibroblast cells and its effect on the molecular mechanisms of cells. The cytotoxicity and viability of the cells were measured by MTT and LDH tests. Arsenic (0.74 mu M) was used to trigger toxicity and Morin (50 mu M) was used for treatment. The levels of oxidative stress biomarkers and the activities of antioxidant enzymes were measured by spectrophotometric method, and inflammatory markers were measured by ELISA method. While mRNA expression levels of Bax, Bcl-2 levels, and Caspase-3 activity were measured by qRT-PCR technique, TUNEL staining was performed to detect DNA breaks and DAPI staining to visualize nuclear changes. Protein structures were retrieved from the protein data bank. OpenBabel and Autodock programs were used for the molecular docking study. Morin rescued the 3T3 embryonic fibroblast cells exposed to arsenic. However, Arsenic decreased the activities of antioxidant enzymes in cells and significantly increased oxidative stress, inflammation, and apoptosis. Morin treatment reduced oxidative damage and TNF-alpha and IL-1 beta levels. Arsenic-induced Caspase-3 mRNA expression level and Bax protein mRNA expression level were significantly increased, while Bcl-2 mRNA expression level was significantly decreased. While Caspase-3 mRNA expression level and Bax protein mRNA expression level decreased with morin treatment, Bcl-2 mRNA expression level increased significantly. Molecular docking study results showed good binding affinity of morin in SOD, GSH-Px, Bax, Bcl-2, Caspase-3, TNF-alpha, and IL-1 beta structures. Morin showed antioxidant, anti-inflammatory, and anti-apoptotic effects against Arsenic-induced cellular toxicity. Graphical AbstractArticle Citation - WoS: 25Citation - Scopus: 29Economic fast synthesis of olive leaf extract and silver nanoparticles and biomedical applications(Taylor & Francis Online, 2021) Atalar, Mehmet Nuri; Baran, Ayşe; Baran, Mehmet Fırat; Keskin, Cumali; Aktepe, Necmettin; Yavuz, Ömer; İrtegun Kandemir, SevgiIn this study, silver nanoparticles (AgNPs) were synthesized economically and simply using an environmentally friendly method with the extract obtained from agricultural waste olive leaves. AgNPs synthesized according to the analysis data were determined to have maximum absorbance at 433.5 nm wavelength, spherical appearance, 7.2 nm crystal nano size and -19.9 mV zeta potential. It was determined by the microdilution method with Minimum Inhibition Concentration (MIC) that AgNPs exert a suppressive effect on the growth of pathogen gram-negative, positive bacteria and yeast at very low concentrations. The cytotoxic effects of the particles were investigated on healthy cell lines (HDF) and cancerous cell lines (U118, CaCo-2, Skov-3). AgNPs showed up to 70% suppression in cancer cell lines.Article Cytotoxic and Antimicrobial Analysis of Biosynthesized Selenium Nanoparticles From Solanum Tuberosum Peels(2025) Keskin, Cumali; Baran, Ayşe; Aktepe, NecmettinIn recent years, interest in the eco-friendly manufacturing of metal nanoparticles from plant extracts has surged. Nonetheless, no research has examined the combined antibacterial and anticancer properties of SeNPs synthesized with Solanum tuberosum (S. tuberosum) extract. This study involved the synthesis of selenium nanoparticles (ST-SeNPs) utilizing phytochemicals with reducing and capturing properties derived from the aqueous extract of S. tuberosum shell through a green synthesis approach. To determine the unique characteristics of ST-SeNPs nanoparticles, a variety of techniques were used, including scanning electron microscopy (SEM), zeta potential analysis, transmission electron microscopy (TEM), dynamic light scattering (DLS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), UV-visible (UV-Vis) spectroscopy, and energy dispersive X-ray spectrometry (EDX). The optical characteristics of ST-SeNPs were validated using UV-Vis measurement, revealing the peak absorbance at 350 nm. FTIR examination verified the presence of functional groups on the surface of the produced ST-SeNPs nanoparticles. Upon examination of the SEM results, it was concluded that the synthesized SeNPs exhibited uniform distribution and possessed a round morphology. The anticancer efficacy of the produced nanoparticles on the A549 lung cancer cell line and OVCAR-3 ovarian cancer cell line after 24 and 48 hours of exposure was assessed using the MTT test. It was established that elevated concentration inhibited cell growth. The inhibitory efficacy of SeNPs against the proliferation of Escherichia coli (E. coli), Staphylococcus aureus (S. aureus), and Candida albicans (C. albicans) was assessed using the disk diffusion agar technique. The evaluated SeNPs exhibited antibacterial efficacy against bacterial and yeast cells. The results indicate that ST-SeNPs produced via green synthesis can serve as anticancer and antibacterial agents.Article Citation - WoS: 6Citation - Scopus: 4Biosynthesis of AgNPs by extract from waste leaves of Citrullus lanatus sp. (watermelon); characterization, antibacterial and antifungal effects(Progress in Nutrition, 2021) Aktepe, Necmettin; Baran, AyşeSilver nanoparticles (AgNPs) are valuable materials with a large number of sectors used. Green synthesis is very important for biomedical applications as they show biocompatible properties. In this study, AgNPs were easily synthesized using the environmentally friendly green synthesis approach using agricultural waste parts of Citrullus lanatus sp. plant grown in Diyarbakır region. Characterization of synthesized AgNPs was made. Fourier Transform Infrared Spectroscopy (FTIR) analysis was used to evaluate the phytochemicals responsible for effective reduction in the formation of AgNPs. UV-visible spectrophotometer (UV-Vis.) Spectra were also used to determine the presence of AgNPs. X-Ray Diffraction Diffractometer (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscope, Zeta potential analyzes were performed to define the crystal structures, dimensions and surface charges of AgNPs, respectively. In these data, it was determined that AgNPs showed maximum absorbance at 460 nm, spherical appearance, 21.27 crystal nano size and -30.05 mV zeta potential. Antimicrobial effects of AgNPs on gram positive Staphylococcus aureus (S. aureus) and Bacillus subtilis (B. subtilis) bacteria, gram negative Escherichia coli (E. coli) and Pseudomonas aeruginosa (P. aeruginosa) bacteria, as well as on fungus C. albicans pathogenic microorganisms It was analyzed by specifying the Minimum Inhibition Concentration (MIC) by microdilution.Article The protective effects of different parts of hypericum perforatum extracts on human mononuclear leukocytes in hydrogen peroxide-induced DNA damage and their phenolic contents(Medicine Science, 2022) Aktepe, Necmettin; Keskin, Cumali; Baran, Ayşe; Atalar, Mehmet Nuri; Baran, Mehmet FıratOxidative stress is the state of the formation of some pathophysiological condition with the excessive increase of the normal amount of free radicals in the organism. In this study, the in vivo genotoxic and antigenotoxic effects of methanol and water extract and phenolic content of Hypericum perforatum flower, fruit, and seed methanol extracts were analyzed. HPLC was used to evaluate the quantities of 3,4-Dihydroxybenzoic acid, syringic acid, hydroxycinnamic acid, O-coumaric acid, caffeic acid, and catechin in the methanol extracts. The alkaline comet test was used to assess the DNA damage and protective effects of H. perforatum flower fruit, seed methanol, and water extract on human mononuclear leukocytes. The amounts of catechin and caffeic acid in seed methanol extract were found as quite high when compared to other extracts. The highest protective effects were seen at 10 and 50μg/ml concentrations of seed methanol extract. The optimum doses of fruit, flower, and seed extracts obtained from H. perforatum neutralized the genotoxic effect. This effect is stronger in seed methanol extract than other extracts. We suggest that more research is needed to evaluate the effects of H. perforatum phytochemicals in vitro and in vivo.
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