Keskin, Cumali

Keskin, Cumali

Name Variants

Keskin, C.

Job Title

Profesör

Email Address

cumalikeskin@artuklu.edu.tr

Main Affiliation

Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri Bölümü

Scholarly Output

66

Articles

52

Citation Count

877

Supervised Theses

6 Scholarly Output Search Results

Now showing 1 - 10 of 56

Biosynthesis, characterization, and investigation of antimicrobial and cytotoxic activities of silver nanoparticles using Solanum tuberosum peel aqueous extract
(Elsevier, 2023) Keskin, Cumali; Baran, Ayşe; Baran, Mehmet Fırat; Keskin, Cumali; Baran, Ayşe; Baran, Mehmet Fırat; Eftekhari, Aziz; Aytuğ Ava, Canan; İrtegün Kandemir, Sevgi; Cebe, Deniz Barış; Dağ, Beşir; Beilerli, Aferin; Khalilov, Rovshan
Metallic nanoparticle biosynthesis is thought to offer opportunities for a wide range of biological uses. The green process of turning biological waste into utilizable products gaining attention due to its economical and eco-friendly approach in recent years. This study reported the ability of Solanum tuberosum (ST) peel extract to the green synthesis of non-toxic, stable, small-sized silver nanoparticles without any toxic reducing agent utilizing the phytochemical components present in its structure. UV-visible spectroscopy, X-ray diffraction analysis, Fourier transform infrared spectroscopy, flourier scanning electron microscopy, atomic force microscopy, transmission electron microscopy, and energy dispersive analysis X-ray confirmed the biosynthesis and char-acterization of silver nanoparticles. Also, dynamic light scattering and thermogravimetric ana-lyses showed stable synthesized nanoparticles. The antibacterial activity of the biosynthesized silver nanoparticles was evaluated against four different bacterial strains, Escherichia coli (E. coli), Pseudomonas aeruginosa (P. aeruginosa), Staphylococcus aureus (S. aureus) Bacillus subtilis (B. subtilis), and a yeast, Candida albicans (C. albicans) using the minimum inhibitory concen-tration technique. The cytotoxic activities were determined against Human dermal fibroblast (HDF), glioblastoma (U118), colorectal adenocarcinoma (CaCo-2), and human ovarian (Skov-3) cell lines cancer cells using MTT test. The nanoparticle capping agents that could be involved in the reduction of silver ions to Ag NPs and their stabilization was identified using FTIR. Nano -particles were spherical in shape and had a size ranging from 3.91 to 27.07 nm, showed crys-talline nature, good stability (-31.3 mV), and the presence of capping agents. ST-Ag NPs significantly decreased the growth of bacterial strains after treatment. The in vitro analysis showed that the ST-Ag NPs demonstrated dose-dependent cytotoxicity against cell lines. Based on the data, it is feasible to infer that biogenic Ag NPs were capped with functional groups and demonstrated considerable potential as antibacterial and anticancer agents for biomedical and industrial applications.
Green Synthesis, Characterization, and Evaluation of Biocompatible Structures of Gold Nanoparticles in Biomedical Applications (Antibacterial, Antifungal, and Anticancer)
(Kahramanmaras Sutcu Imam University, 2023) Keskin, Cumali; Baran, Ayşe
Altın nanopartiküller (AuNP'ler), toksisitelerinin düşük olması ve yüksek uyumlulukları ile sağladıkları geniş ve düzenlenebilen yüzey alanlarının olmasından dolayı dikkat çekmektedirler. Bu çalışmada, Celtis tuernofortii Lam. (CT) yaprakları altın nanoparçacıkların (AuNP'ler) yeşil sentezi için ilk kez kullanıldı. Sentezlenen AuNP'lerin boyutu, şekli, yüzey yükü ve işlevselliği ayrıntılı olarak tanımlandı. Test edilen hedef hücreler üzerinde önerilen etki mekanizmaları vurgulandı. “Yeşil” AuNP'lerin biyolojik aktiviteleri (antibakteriyel, antifungal ve antikanser) ve bunların diğer biyomedikal uygulama olasılıkları da tartışıldı. Sentezlenen AuNP'ler küresel bir görünüm, 553.67 nm dalga boyunda yüzey plazmon rezonans bandı ve -16.53 mV yüzey yükü sergiledi. Partiküllerin morfolojisi, boyutu ve yüzey yükünün indirgeme reaksiyonunda kullanılan yaprak ekstraktından etkilendiği gözlemlendi. FTIR ve TGA-DTA verileri, CT özünden elde edilen fonksiyonel grupların AuNP'lerin sentezine ve stabilizasyonuna katıldığını ortaya koydu. AuNP’ler, mikrodilüsyon yöntemi (MIC) ile test edilen tüm suşlar ve mayalar üzerinde antibakteriyel ve antifungal etkiler gösterdi. AuNP'ler kanser hücre hatları (SKOV-3, CaCo2 ve U118) üzerinde doza bağlı sitotoksik aktivite gösterdi. Elde edilen sonuçlar, önemli biyolojik özellikler gösteren AuNP'leri sentezlemek için CT yaprak özütü kullanan, potansiyel olarak düşük maliyetli bir yeşil sentez yöntemini vurgulamaktadır.
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; Baran, Mehmet Fırat; Baran, Mehmet Fırat
Oxidative 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.
Editorial: Biological/chemical-based metallic nanoparticles synthesis, characterization, and environmental applications
(Frontiers Media S.A., 2023) Keskin, Cumali; Eftekhari, Aziz; Khalilov, Rovshan; Kavetskyy, Taras; Prasad, Ram; Rosic, Gvozden Luka
Parts of plants are used to carry out the reduction reactions. Although there are different methods for the synthesis of nanomaterials, biological synthesis is relatively cheap, environmentally friendly, and safe compared to other methods (Ahmadov and Ramazanli, 2019; Ramazanli and Ahmadov, 2022). The aim of the Research Topic on “Biological/Chemical-Based Metallic Nanoparticles Synthesis, Characterization, and Environmental Applications” was to provide an integrated view of the state-of-theartresearch on recent advances in biosynthesis, characterization of biological/chemicalbased nanomaterials, and their application by providing a comprehensive understanding of the topic through original research and review articles focusing on the biological synthesis method, in which bacteria, fungi, algae, and various.
Ecofriendly Synthesis of Silver Nanoparticles Using Ananas comosus Fruit Peels: Anticancer and Antimicrobial Activities
(Hindawi, 2021) Keskin, Cumali; Baran, Ayşe; Baran, Mehmet Fırat; Huseynova, Irada; Khalilov, Rovshan; Eftekhari, Aziz; Irtegun-Kandemir, Sevgi; Kavak, Deniz Evrim
Metallic nanoparticles are valuable materials and have a range of uses. Nanoparticles synthesized from plant wastes by environment-friendly methods have attracted the attention of researchers in recent years. Also, the advantages of biological resources and synthesis methods are attracting attention. In this study, silver nanoparticles were synthesized from Ananas comosus fruit peels using ecofriendly method steps. The characterization of the particles obtained was determined by using a UV-visible spectrophotometer (UV-Vis.), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction diffractometer (XRD), Fourier scanning electron microscope (FESEM), and transmission electron microscopy (TEM). The nanoparticles showed maximum absorbance at 463 nm, measuring 11.61 in crystal nanosize, and presented spherical in appearance. An antimicrobial activity test was determined with the minimum inhibition concentration (MIC) method. The nanoparticles showed promising inhibitory activity on the Gram-positive and Gram-negative pathogen microorganisms (Escherichia coli ATCC25922, Staphylococcus aureus ATCC29213, Bacillus subtilis ATCC11774, Pseudomonas aeruginosa ATCC27833 bacteria, and Candida albicans yeast) at low concentrations. The cytotoxic and growth inhibitory effects of silver nanoparticles on different cancer cell lines were examined via the MTT assay. © 2021 Ayşe Baran et al.
Celtis Tournefortii Lam. Bitkisinin Yeşil Yapraklarından Gümüş ve Altın Nanopartiküllerin Biyolojik Yolla Sentezi, Karakterizasyonu, Kimyasal Kompozisyon ve İn-vitro Antimikrobiyal ve Sitotoksik Aktivitelerinin Belirlenmesi
(2024) Keskin, Cumali; Baran, Ayşe; Keskin, Cumali
Celtis tournefortii Lam. (C.tournefortii) bitkisinin atık durumundaki yeşil yapraklarından elde edilen özüt kullanılarak iki farklı konsantrasyonda altın nanopartiküllerin (AuNP'lerin) ve gümüş nanopartiküllerin (AgNP'lerin) sentezi, ucuz, kolay ve çevre dostu bir yaklaşımla yapıldı. Sentez sonucunda elde edilen AuNP'lerin ve AgNP'lerin karakterizasyonu UV-vis Spektrofotometre, XRD, FTIR, TEM, AFM, FESEM, EDX, TGA-DTA, DLS cihazlarından elde edilen veriler aracılığıyla değerlendirildi. 5 ve 10 mM'da sentezlenen AuNP'lerin sırasıyla, küresel morfolojik görünümde, negatif yüzey yük dağılımında, 553.67-555.32 nm maksimum absorbansa sahip ve 31.30-53.55 nm boyut dağılımında oldukları belirlendi. 5 ve 10 mM'da sentezlenen AgNP'lerin sırasıyla, 479.10-482.13 nm maksimum absorbansta, negatif yüzey yük dağılımında, ortalama 4.8-15 nm boyutlarda ve küresel görünümde oldukları bulgusuna ulaşıldı. Elde edilen AuNP'lerin ve AgNP'lerin, in-vitro antimikrobiyal ve antikanser etkileri, sırasıyla mikrodilüsyon ve MTT metotları kullanılarak incelendi. Sentezlenen AuNP'lerin antibiyotiklerden daha düşük olan, 0.01 ve 0.50 µg mL-1 aralığındaki konsantrasyonların patojen mikroorganizmaların üremelerinin baskılamada etkili oldukları görüldü. AuNP'lerin 25 µg mL-1 konsantrasyonunun en iyi antikanser etkisi, % 88.58 oranında baskılama ile CaCo-2 hücre hattı üzerinde olduğu belirlendi. Diğer hücre hatlarının üremesi üzerinde de etkili baskılama oluştuğu tespit edildi. AgNP'lerin patojen suşların üremesi üzerindeki baskılayıcı etkisinin 0.03-1.00 µg mL-1 gibi düşük konsantrasyonlarda, standart antibiyotiklerden daha etkili oldukları görüldü. AgNP'lerin sağlıklı hücre hattı HDF üzerinde 25 µg mL-1 konsantrasyonun % 79.45 canlılık oranı ile toksik etkisinin nerdeyse olmadığı belirlendi. Kanser hücre hatlarında ise canlılığı baskılamada en iyi etkinin, % 75.36 baskılama oranıyla CaCo-2 hücre hattı üzerinde oluşturduğu belirlendi. Bunun yanında diğer kanser hücreler hatlarının üremesi üzerinde önemli düzeyde baskılama meydana getirdi. C. tournefortii özütünün fitokimyasal bileşen bakımından karakterize edilmesi için, LC-MS/MS verilerinden elde edilen profil kullanıldı. Profilde en yüksek konsantrasyona sahip olan bileşenlerin sırasıyla, rutin, kumarin, biosiyanin A, şikimik asit, klorojenik asit olduğu belirlendi. Ayrıca özütün antimikrobiyal ve antikanser etkileri de incelendi. Özütün, AgNP'ler ve AuNP'lere kıyasla daha yüksek konsantrasyonda daha az etki gösterdiği belirlendi.
Economic fast synthesis of olive leaf extract and silver nanoparticles and biomedical applications
(Taylor & Francis Online, 2021) Keskin, Cumali; Aktepe, Necmettin; Baran, Ayşe; Baran, Mehmet Fırat; Aktepe, Necmettin; Yavuz, Ömer; İrtegun Kandemir, Sevgi
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.
Determination of chemical composition and antioxidant, cytotoxic, antimicrobial, and enzyme inhibition activities of Rumex acetosella L. plant extract
(Springer int Publ Ag, 2024) Aktepe, Necmettin; Keskin, Cumali; Baran, Ayşe; Baran, Mehmet Fırat; Atalar, Mehmet Nuri; Keskin, Cumali; Khalilov, Rovshan
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.
Determination of fatty acid compositions of total lipid, phospholipid and triacylglycerol fractions of the wild edible mushroom Pleurotus ostreatus and Russula delica with cytotoxic activities on pc-3 cell lines
(2018) Acay, Hilal; Kaçar, Semra; Keskin, Cumali; Dündar, Abdurrahman
Fatty acids (FAs) of Pleurotus ostreatus and Russula delica were identified in TL (Total Lipid), TG (Triacylglycerol ) and PL (phospholipid) fractions. The major FAs of TL, TG, PL in both species were Cl6:0 (palmitic açid, PA), Cl8:1 n-9 (oleic acid, OLA) and Cl8:2 n-6 (linoleic acid, LA). In both species, total PUFA amounts were found to be higher than total MUFA and total SFA in TL, TG and PL fractions. The efficient production of the fatty acids especially linolenic and oleic acids which are majorly needed in building blocks of dietary human has confirmed these species as good source of nutrition. On the other hand, insufficiently studied cytotoxic activity (using pC-3 cell lines) of these mushrooms were investigated by using various solvent systems Ethyl acetate extract of Russula delica and, Pleurltus ostreatus showed significant inhibitory value at the concentrations of 520-530 µg/ml (99,45%- 92,82%) against PC-3 cell lines with IC50; 274,53-297,77 µg /mL respectively. Methanol extracts did not show any cytotoxic activity. lt has been found that the potential of cytotoxic activity is depended on concentration and solvent type of extracts. As a result, the present study is a guide for biochemiçal and nutritional values of the both species and can be useful for further investigation on plıarnıacological applications.
Alcea Striata Ssp. Striata (Hatmi) Sulu Özütünden Selenyum Nanopartıküllerin Biyosentezi, Karakterizasyonu, Antimikrobiyal ve Sitotoksik Aktivitelerinin Belirlenmesi
(2024) Keskin, Cumali; Keskin, Cumali
Küçük boyutları, güçlü biyolojik aktiviteleri, biyoyararlanımları, düşük toksisiteleri ve yaygın uygulamaları nedeniyle nanopartiküller büyük ilgi alanı hâline gelmiştir. Sentez aşamasında tehlikeli kimyasalların kullanılması, maliyetin yüksek olması ve oluşturulan parçacıkların kararsızlığı nedeniyle son yıllarda fiziksel ve kimyasal yaklaşımlara alternatif olarak 'yeşil sentez' olarak bilinen bir teknik ortaya çıkmıştır. Yeşil sentezde mantar, maya, bitki ekstraktları ve bakteri kültürü filtratı gibi biyolojik kaynaklardan sıklıkla yararlanılmaktadır. Bu biyolojik kaynaklar, altın, gümüş, çinko, selenyum ve daha fazlası dahil olmak üzere çok çeşitli metallerin oluşturulmasında kullanılmış olup, bunların hepsi hızla üretilmektedir. İnsan vücudu eser element olarak selenyuma ihtiyaç duyar. Biyolojik kaynaklardan türetilen selenyum nanopartiküllerinin (SeNP'ler) fiziksel, kimyasal ve biyolojik özelliklerinin inorganik ve organik selenyumdan farklı olduğu bulunmuştur. Bu çalışmada biyolojik kaynak kullanarak yeşil sentez yöntemiyle Alcea striata ssp. striata (hatmi) bitkisinin sulu özütünden selenyum nanopartikülleri (SeNP) sentezlendi. Sentezlenen SeNP'ler Fourier Transform İnfrared Spektroskopisi (FT-IR), UV-Görünür Işık Spektrofotometresi (UV-vis), X-Işını Kırınımı (XRD), Taramalı Elektron Mikroskobu, Geçirimli Elektron Mikroskobu (TEM), Enerji Dağılımlı X-Işını (EDAX), Atomik Güç Mikroskobu (AFM), Zeta Potansiyel ve Zeta Dağılım Analizi gibi spektroskopik yöntemler kullanılarak SeNP'lerinin oluşumu doğrulandı. Sentezlenen selenyum nanopartiküllerin mikroorganizmalar üzerindeki antimikrobiyal etkileri ve sağlıklı ve kanser hücreleri üzerinde sitotoksik etkileri MTT metodu kullanılarak incelenmiştir.