Yıldırım, Ayfer
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Yildirim, Ayfer
Yildirim, Ayfer
Yildirim, Ayfer
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Doçent
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ayferyildirim@artuklu.edu.tr
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Department of Medical Services and Techniques / Tıbbi Hizmetler ve Teknikleri Bölümü
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17
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2
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2
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5
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6
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3
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13
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10
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16
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8
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15
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3
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9
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14
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7
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11
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2
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12
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11
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230
Scholarly Output
16
Articles
16
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WoS Citation Count
147
Scopus Citation Count
203
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7
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9
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1
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9.19
Scopus Citations per Publication
12.69
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6
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| Journal | Count |
|---|---|
| International Journal of Environmental Analytical Chemistry | 3 |
| Journal of the Turkish Chemical Society, Section A: Chemistry | 2 |
| Chemistry & Biodiversity | 1 |
| Dicle Tıp Dergisi | 1 |
| Dicle Üniversitesi Mühendislik Fakültesi Mühendislik Dergisi | 1 |
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Now showing 1 - 10 of 16
Article Citation - WoS: 10Citation - Scopus: 14The antioxidant and anti-apoptotic potential of Pleurotus eryngii extract and its chitosan-loaded nanoparticles against doxorubicin-induced testicular toxicity in male rats(Wiley, 2021) Erdem Güzel, Elif; Kaya Tektemur, Nalan; Tektemur, Ahmet; Acay, Hilal; Yıldırım, AyferThis study was conducted to evaluate the protective role of Pleurotus eryngii extract (PE) and Pleurotus eryngii extract-loaded chitosan nanoparticles (PE-CSNP) against doxorubicin (DOX)-induced testicular toxicity in rats. Male rats were divided into six groups: control (DMSO/ethanol), PE (200 mg/kg PE), PE-CSNP (30 mg/kg PECSNP), DOX (10 mg/kg DOX, a single dose, i.p), DOX+PE (10 mg/kg DOX+200 mg/ kg PE) and DOX+PE-CSNP (10 mg/kg DOX+30 mg/kg PE-CSNP). PE and PE-CSNP were administered by oral gavage every other day for 21 days. DOX-treated rats showed histopathological impairment compared with the control group. There was an increase in the apoptotic index, caspase 3 (CASP3), BCL2-associated X apoptosis regulator (BAX), dynamin-related protein 1 (DRP1) expression and total oxidative status (TOS) in the DOX group, while mitofusin-2 (MFN2), total antioxidative status (TAS) and serum testosterone levels of the DOX group reduced when compared with the other groups. PE and PE-CSNP treatments provided significant protection against DOX-induced oxidative stress by reducing TOS levels and increasing TAS levels. CASP3, BAX, apoptotic index and DRP1-MFN2 expressions were restored by PE and PE-CSNP. However, the PE-CSNP showed higher antioxidant and anti-apoptotic efficacy compared with PE. Thus, our results provide evidence that CSNP and PE could synergistically have a potent antioxidant and anti-apoptotic therapy against DOX-induced testicular damage in male rats.Article Β-Siklodekstrin Bazlı Kompozitin Sentezi ve Katyonik Boya Gideriminde Kullanımı(Dicle Üniversitesi Mühendislik Fakültesi Mühendislik Dergisi, 2020) Yıldırım, AyferBu çalışmanın amacı, β-siklodektrin bazlı kompozit sentezlemek ve katyonik boya maddesi gideriminde kullanmaktır. Adsorpsiyon deneyleri beç yöntemi kullanılarak uygun şartlarda gerçekleştirilmiştir. Karakterizasyon çalışmaları için kompozitin boya maddesi giderim öncesi ve sonrası spektrumları fourier dönüşüm kızılötesi (FT-IR) spektroskopisi ile incelenmiştir. Boyar madde adsorpsiyonuna temas süresi, başlangıç boya madde derişimi ile pH etkisi gibi parametreler araştırıldı. Adsorpsiyon için en uygun pH’ nın 8 olduğu bulunmuştur (deneysel şartlar: başlangıç boya derişimi (Co): 100 mg/L, sıcaklık (T): 25 oC, karıştırma hızı (r): 140 rpm, adsorbent miktarı (m): 10 mg, boyar madde çözelti hacmi (V): 50 mL). pH etkisi deneysel koşuları için pH: 3,4, 5, 6, 7, 8 olarak sabitlenmiş 6 farklı boya çözeltisi kullanılmıştır. Adsorpsiyon deneyleri, adsorpsiyon kapasitesinin deneysel değişkenlerine bağımlı ve dolayısıyla adsorpsiyonun pH'a bağımlı olduğunu göstermiştir. Bunun yanında, adsorpsiyon mekanizması psödo-birinci-mertebe ve psödo-ikinci-mertebe kinetik modellerinde değerlendirilmiştir. Deneysel verilerden elde edilen sonuçlara göre, korelasyon kat sayılarının daha büyük olması dolayısıyla (R2 > 0.99), psödo-ikinci-mertebe kinetik modelinin katyonik boya giderimi için psödo-birinci mertebe kinetik modeline göre daha elverişli olduğu tespit edilmiştir. Elde edilen verilerden en yüksek boya adsorpsiyon kapasitesinin 240.12 mg/g olduğu rapor edilmiştir (Co: 300 mg/L, T: 25 oC, r: 140 rpm). Sonuç olarak sentezlenen kompozit maddenin adsorpsiyon kapasitesinin iyi olması nedeniyle katyonik boya gideriminde uygun bir malzeme olduğu söylenebilir.Article Citation - WoS: 13Citation - Scopus: 15Removal of the Anionic Dye Reactive Orange 16 by Chitosan/Tripolyphosphate/Mushroom(Chemical Engineering and Technology, 2021) Yıldırım, AyferThe green composite chitosan/tripolyphosphate/mushroom (C-TPP-PEE) was synthesized and evaluated for its adsorption performance of the dye Reactive Orange 16 (RO16), by using the batch technique. Fourier-transform infrared spectroscopy, thermogravimetric analysis, and field emission scanning electron microscopy were employed to characterize the C-TPP-PEE. The maximum adsorption capacity of the RO16 dye for batch adsorption was determined as 736 mg g−1. The experimental kinetic data at equilibrium was found to be best fitted to the pseudo-second-order kinetic model. The results showed that the adsorption isotherm was best correlated to the Langmuir model. The thermodynamic data indicated that the adsorption process was spontaneous, favorable, and endothermic.Article Citation - WoS: 16Citation - Scopus: 19Evaluation and characterization of Pleurotus eryngii extract-loaded chitosan nanoparticles as antimicrobial agents against some human pathogens(Taylor & Francis Online, 2020) Acay, Hilal; Yıldırım, Ayfer; Erdem Güzel, Elif; Kaya, Nalan; Baran, Mehmet FıratWith the increase of antibiotic resistance, which is present at a worrying rate, research on the use of newly developed nanoparticles as an antimicrobial agent with green biotechnology has intensified. The study aimed to investigate the antimicrobial effects of chitosan nanoparticles (CSNP) synthesized using Pleurotus eryngii extract (PE). Characterization of P. eryngii-loaded chitosan nanoparticles (PE-CSNPs) was performed with Fourier transform infrared spectrophotometer, X-ray diffraction, Field-emission scanning electron microscopy, Brunauer-Emmett-Teller, Differential scanning calorimetry, and zeta potential techniques. The FE-SEM images showed that the surface morphology of nanoparticles is similar to CS, but has more porosity network and smaller dimensions structure. The average particle size of spherical PE-CSNPs was obtained as 330.1 nm. The specific surface area and average pore diameter of the synthesized nanoparticles were found as 3.99 m2g-1 and 2.25 nm, respectively. X-ray diffraction determines the presence of an amorphous peak at 2θ = 21.2° results from CS and PE. PE-CSNPs synthesized using P. eryngii extract showed strong antimicrobial activity against Escherichia coli, Staphylococcus aureus, Bacillus subtilis, and Candida albicans as 0.0156, 0.0625, 0.0625 and 0.0312 mg ml-1, respectively. Thus, it was determined that chitosan nanoparticles formed by the green synthesis of P. eryngii extract showed strong anti-microbial properties.Article Citation - WoS: 55Citation - Scopus: 62Adsorption Behaviors of Malachite Green by Using Crosslinked Chitosan/Polyacrylic Acid/Bentonite Composites with Different Ratios(Elsevier, 2020) Yildirim, Ayfer; Bulut, YaseminIn this study, by using different quantities of methylenebisacrylamide (MBA) and acrylic acid (AA), chitosan/polyacrylic acid/bentonite composites (CCS/PAA/BNTs) were synthesized and used for the adsorption of malachite green (MG). The fourier transmission infrared spectra, thermogravimetric analysis-differential thermal analysis and scanning electron microscopy techniques were used to determine synthesized composites. The effects of initial concentration, contact time, temperature and pH were investigated. Kinetic studies indicated that, due to the pseudo-second order model, correlation coefficients (R-2 >0.98) were the best fit thus, by using k(ps), the activation energies (E-a) were calculated (19.06, 15.64, 19.49, 8.29, 24.53 kJmol(-1)). The equilibrium data of MG agreed with the Langmuir model. The highest adsorption capacity calculated was found as 384.62-454.55 mgg(-1) for MG adsorption at 298-318 K. Thermodynamic studies demonstrated that MG adsorption was endothermic, caused spontaneous reaction and increased the entropy between 298-318 K. The adsorption reactions of MG were revealed as physisorption (Delta H<80 kJmol(-1)). The optimum pH was found as 6. The CCS/PAA/BNT2 composite indicated the highest adsorption capacity and best thermal stability compared to the other composites. (C) 2019 Elsevier B.V. All rights reserved.Article Citation - Scopus: 1Utilization of edible mushroom for nanomaterial-based bioactive material development(Iranian Journal of Materials Science and Engineering, 2021) Acay, Hilal; Yıldırım, Ayfer; Baran, AyşeGold nanoparticles (AuNP) were synthesized using edible mushroom Russula delica (RD) in this study. Possibilities to evaluate these synthesized nanoparticles (RD-AuNPs) as bioactive substances were investigated. Characterization of synthesized RD-AuNPs were characterized via UV-vis, XRD, FTIR, EDX. In a spherical view, RD-AuNPs with a crystal size of 34.76 nm were synthesized. As a result, fungal systems used for nanomaterial biosynthesis as an effective alternative to chemical synthesis can be used in different biotechnological and medical applications. RD-AuNPs produced by green synthesis can be evaluated in this context.Article Citation - WoS: 4Citation - Scopus: 5Kinetic, Equilibrium and Thermodynamic Investigations for the Bio-Sorption of Dyes Onto Crosslinkedpleurotus Ostreatus-based Bio-Composite(Taylor & Francis Ltd, 2022) Yildirim, AyferWater pollution due to dyes has a significant impact on the environment and causes unfavourable risks for human health. This study aimed to synthesise a crosslinkedPleurotus ostreatus-based bio-composite as an efficient low cost biosorbent and investigate its bio-sorption performance for dyes via kinetic, isotherm and thermodynamic parameters. The characterisation of the bio-composite was determined by Fourier transform infrared spectrophotometer, field-emission scanning electron microscopy, differential scanning calorimetry and X-ray diffraction. Two reflections peaks, 2 theta = 13 degrees and 21 degrees, were revealed in the X-ray diffraction pattern of the bio-composite. The effects of contact time, pH and initial dye concentration were investigated as the physical-chemical parameters. The neutral pH was found as an optimum pH for dyes. The reuse test revealed that the bio-sorbent was capable of using 5 times for dyes. The pseudo-first order and pseudo-second order kinetic models were applied to determine the mechanism of the adsorption process. The isotherm investigation was conducted using the Langmuir and Freundlich isotherm models. The experimental data was determined to be in the good agreement with the pseudo-second-order model and Langmuir isotherm model. The maximum adsorption capacity was measured to be 77.11 and 40.11 mg/g for the bio-sorption of malachite green and methylene blue, respectively. The thermodynamic studies of the bio-sorption showed that the adsorption process was a spontaneous endothermic process and that disorder increased during the process. This study indicated that the synthesised bio-sorbent could be used as an eco-friendly, cost-effective and recyclable bio-composite for the bio-sorption of dyes from aqueous solution.Article Citation - WoS: 12Citation - Scopus: 13Synthesis and Characterisation of Mushroom-Based Nanocomposite and Its Efficiency on Dye Biosorption Via Antimicrobial Activity(Taylor & Francis Ltd, 2022) Yildirim, Ayfer; Acay, Hilal; Baran, FiratMushrooms are highly effective for biotechnological products and economically. Mushroom-based nanocomposites occasionally used in recent studies. Pleurotus ostreatus (PO) from southeast Turkey that used in our work is the most commonly present cultivated white-rot edible fungus all around the world. Until now, no report is existing on the biosorption study of Reactive orange 16 (RO16) with mushroom-based nanocomposite. Therefore, the main goal of this work was to synthesise Pleurotus ostreatus-based-chitosan (POCN) nanocomposite and characterise via Fourier transform infrared spectrophotometer, Differential scanning calorimetry, Field-emission scanning electron microscopy, Brunauer-Emmett-teller, and X-ray diffraction techniques; investigate the antimicrobial activity and adsorption behaviour for removal of RO16 dye. The adsorption of RO16 by batch technique was evaluated with pH, initial dye concentration and temperature effect. Point of zero charge was evaluated. The adsorption of dye followed by the pseudo-second-order kinetic model and data of equilibrium was well fitted with the Langmuir isotherm model. The maximum adsorption capacity of POCN for RO16 was found as 65.5 mg/g (initial dye concentration: 100 mg/g, temperature: 298 K). Besides, POCN was researched for antimicrobial activity against some pathogens such as Escherichia coli ATCC 25922, Staphylococcus aureus ATCC 25923, Bacillus subtilis ATCC 11774 standard bacterial strains and Candida albicans ATCC 10231 fungal strain by using microdilution method on the Minimum Inhibiting Concentration (MIC). Furthermore, during four cycles of adsorption and desorption, regeneration experiment revealed good reusability of POCN nanocomposite with 0.1 M HCl as a desorbing agent.Article Citation - WoS: 6Citation - Scopus: 9Adsorption Performance of bacillus Licheniformis Sp. Bacteria Isolated From the Soil of the Tigris River on Mercury in Aqueous Solutions(Taylor & Francis Ltd, 2022) Baran, M. Firat; Yildirim, Ayfer; Acay, Hilal; Keskin, Cumali; Aygun, HusamettinMercury is known to be one of the most toxic heavy metals in the environment and is released into the water systems in significant quantities through natural events and industrial process activities. Many chemical materials are used as adsorbents in the removal of toxic metals from the environment and wastewaters. However, using microorganisms as bio-sorbents instead of chemical materials has become common recently due to their low cost, easy availability and presence in nature. In this study, Bacillus licheniformis in the soil isolated from the Tigris River was used as bio-sorbent. The mercury (Hg(II)) absorption behaviour of Bacillus licheniformis bacteria (BLB) was investigated using inductively coupled plasma mass spectrometry. The effects of equilibrium of adsorption time, temperature, adsorbent dosage and pH on the adsorption of Hg (II) onto BLB were determined. The maximum adsorption capacity of Hg (II) onto BLB was determined as 82.12 mg/g (T = 25 degrees C, pH 5, Co = 50 mg/L, m = 25 mg). The BLB was characterised using Fourier transform infrared spectroscopy analysis, thermal gravimetric analysis/differential thermal analysis, scanning electron microscopy analysis and energy-dispersive X-ray spectroscopy analysis. In addition, pseudo-first-order and pseudo-second-order kinetic models were applied. The equilibrium data for the adsorption of Hg(II) onto BLB were examined by the Langmuir and Freundlich isotherm models. The activation energy was calculated using the pseudo-second-order rate constant. These results suggested the BLB can be used as an efficient adsorbent for the removal of Hg(II) metal ions from wastewater. When the results of bio-sorption studies were examined, it was found that the bio-sorbent could be reused easily. The present study suggests that microorganism bio-sorbents are useful for the efficient removal of mercury from aqueous solutions.Article Citation - Scopus: 16Biosorption Studies of Mushrooms for Two Typical Dyes(Journal of the Turkish Chemical Society, Section A: Chemistry, 2020) Yıldırım, Ayfer; Acay, HilalThis study investigated the adsorption behaviour of two cationic dyes, methylene blue (MB) and malachite green (MG) onto Pleurotus ostreatus, Armillaria tabescens, and Morchella conica mushrooms. The effects of contact time, initial dye concentration, and solution pH (3-11) were also determined. The adsorption on all mushrooms attained equilibrium within 120 min for both MB and MG. To evaluate the experimental kinetics data, the pseudo-first-order, pseudo-second-order, and intraparticle diffusion kinetics equations were utilised. The pseudo-first-order kinetic model demonstrated a good fit with all adsorption kinetics. The Langmuir and Freundlich isotherm models were used to analyse the mechanism of the adsorption isotherm. The adsorption equilibrium isotherm was in a good agreement with the Freundlich model. Thermodynamic parameters such as ΔH enthalpy variation, ΔS entropy variation, and ΔG free Gibbs energy variation were calculated at 303-323 K. The results suggested that the Pleurotus ostreatus mushroom was the most suitable adsorbent for both cationic dyes’ removal.
