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    Analysis of bioactive compounds using LC-ESI-MS/MS, cytotoxic, antimicrobial effects, and enzyme activities from Cyclotrichium origanifolium
    (Wiley, 2023) Aktepe, Necmettin; Baran, Ayse; Atalar, Mehmet Nuri; Baran, Mehmet Firat; Keskin, Cumali; Taskin, Abdullah; Yavuz, Oemer
    Cyclotrichium origanifolium is a medicinal plant belonging to the Lamiaceae family. In this study, phenolic content analysis, antimicrobial effects, and cytotoxic effects of extracts of C. origanifolium were investigated. In the extracts, phenolic compound analysis by the liquid chromatography-electrospray ionization-tandem mass spectrometry method, antimicrobial effect by the minimum inhibition concentration method, and cytotoxic effect on human dermal fibroblasts (HDF), glioblastoma cell (U87), ovarian adenocarcinoma cell (Skov-3), and human colorectal adenocarcinoma cell (CaCo-2) cancer cell lines were investigated. Cytotoxicity analyses were performed by the MTT method. In addition, the GST and AChE enzyme activities of the extracts were also measured. Around 18 compounds were detected in both the methanol and ethanol extract. It was found that the best antimicrobial effect on Gram-negative Pseudomonas aeruginosa was on methanol extract, while the ethanol extract was on Candida albicans fungus (respectively, 2.50 mg/ml, 5.0 mu g/ml). A 500 mu g/ml of methanol extract has been shown to have cytotoxic activity high effect on HDF cells. GST and AChE activity were found to decrease in a concentration-dependent manner.
  • Küçük Resim
    Öğe
    Determination of chemical composition and antioxidant, cytotoxic, antimicrobial, and enzyme inhibition activities of Rumex acetosella L. plant extract
    (Springer Int Publ Ag, 2024) Kandemir, Sevgi İrtegun; Aktepe, Necmettin; Baran, Ayse; Baran, Mehmet Fırat; Atalar, Mehmet Nuri; Keskin, Cumali; Karadağ, Musa
    Purpose 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.
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    Economic fast synthesis of olive leaf extract and silver nanoparticles and biomedical applications
    (Taylor & Francis Inc, 2022) Atalar, Mehmet Nuri; Baran, Ayse; Baran, Mehmet Firat; Keskin, Cumali; Aktepe, Necmettin; Yavuz, Omer; Kandemir, Sevgi Irtegun
    In 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.
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    In-vitro Antioxidant, Cytotoxic, Cholinesterase Inhibitory Activities and Anti-Genotoxic Effects of Hypericum retusum Aucher Flowers, Fruits and Seeds Methanol Extracts in Human Mononuclear Leukocytes
    (Shaheed Beheshti Univ, Sch Pharmacy, 2017) Keskin, Cumali; Aktepe, Necmettin; Yukselten, Yunus; Asuman; Boga, Mehmet
    The present study investigates the antioxidant, anticancer, anticholinesterase, anti-genotoxic activities and phenolic contents of flower, fruit and seed methanol extracts of Hypericum retusum AUCHER. The amounts of protocatechuic acid, catechin, caffeic acid and syringic acid in methanol extracts were determined by HPLC. Total phenolic content of H. retusum seed extract was found more than fruit and flower extracts. The DPPH free radical scavenging activity of flower and seed methanol extracts showed close activity versus BHT as control. Among three extracts of H. retusum only flower methanol extract was exhibited considerable cytotoxic activities against to HeLa and NRK-52E cell lines. Moreover, seed methanol extract showed both acetyl and butyrl-cholinesterase inhibitory activity. The highest anti-genotoxic effects were seen 25 and 50 mu g/mL concentrations. In this study, the extracts showed a strong antioxidant and anti-genotoxic effect. The seed extract was more efficient-than extracts of fruit and flowers. Our results suggest that the antioxidant and anti-genotoxic effects of extracts depend on their phenolic contents. Further studies should evaluate the in-vitro and in-vivo the benefits of H. retusum seed methanol extracts.
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    Removal of heavy metals in water by biosorption method using three different bacillus sp- derived biosorbents
    (Kahramanmaraş Sütçü İmam Üniversitesi, 2022) Baran, Mehmet Fırat; Düz, Zahir; Baran, Ayşe; Keskin, Cumali; Aktepe, Necmettin
    Water is an important part of the ecosystem for life. With industrialization, pollution in water resources has reached a worrying level. Water pollution due to heavy metals and their increasing concentrations have caused researchers to increase their interest in the subject due to the damage they cause to water ecosystems. It requires serious cost and time to eliminate the pollution caused by heavy metals in water. In recent years, the use of biosorption method using bacteria to remove heavy metals in water has become widespread. The main reason why this method is preferred is that gram-positive bacteria have a thick peptidoglycan layer on the cell wall and increases the adsorption capacity. In this study, in drinking, waste, river water and artificially prepared samples, batch method of heavy metal biosorption and biosorption competition in multiple prepared heavy metal solutions were investigated. For these processes, Bacillus licheniformis sp. Bacillus subtilis sp. and Bacillus subtilis (ATCC 6051) strains were used as a biosorbent. Biosorbtion of Cd (II), Cu (II), Pb (II), Fe (II), Ni (II) and Zn (II) metals from waters with these biosorbents at different pHs at 25 ° C with 0.25 mg L-1 It was carried out using. Surface morphological structures of biosorbents were evaluated using SEM images and element compositions were evaluated using EDAX profile. Element content was determined using ICP-OES. It was determined that heavy metal ions were removed up to 98% with maximum biosorption at pH 6.0.
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    The Characterization of Silver Nanoparticles Synthesized From Prunus spinosa Fruit and Determination of Antimicrobial Effects on Some Food Pathogens
    (RDCONF, 2021) Atalar, Mehmet Nuri; Baran, Ayşe; Hatipoğlu, Abdulkerim; Baran, M.firat; Yavuz, Ömer; Aktepe, Necmettin; Keskin, Cumali
    Bu çalışmada, gümüş nanopartiküller (AgNP'ler) Prunus spinosa (PS) meyve özütü kullanılarak kolay, düşük maliyetli ve çevre dostu bir şekilde sentezlendi. Ultraviyole (UV)-görünür Spektrofotometre analiz verilerine göre, nanokristaller 438.3 nm'de karakteristik bir tepe noktası gösterdi. Alan Emisyon Taramalı Elektron Mikroskobu (FE-SEM), Transmisyon Elektron Mikroskobu (TEM) ve Atomik Güç Mikroskopisi (AFM) analizleri, biyosentezlenen AgNP'lerin morfolojik yapılarının küresel olduğunu ortaya koydu. XRD analizi sonuçlarına göre AgNP'lerin kristal yapılarının kübik olduğu belirlendi. Nanopartiküllerin boyutu, Debye-Scherrer denklemi ile 29,34 nm olarak hesaplandı. Sentezlenen nanomalzemenin zeta boyutu 117.4 nm olarak ölçülmüştür. AgNP’lerin gıda patojenleri olan Bacillus subtilis, Pseudomonas aeruginosa, Staphylococcus aureus ATCC 29213, Escherichia coli ATCC25922 ve Candida albicans üzerindeki inhibisyon etkileri Minimum İnhibitör Konsantrasyon (MİK) yöntemiyle ortaya konuldu.