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Articles 541 - 570 of 2720
Full-Text Articles in Chemistry
Spectroscopic Investigation Of Defect-State Emission In Cdse Quantum Dots, Gülhan Güleroğlu, Caner Ünlü
Spectroscopic Investigation Of Defect-State Emission In Cdse Quantum Dots, Gülhan Güleroğlu, Caner Ünlü
Turkish Journal of Chemistry
CdSe quantum dots are the most studied Cd-based quantum dots with their high quantum yield, high photostability, narrow emission band, and easy synthesis procedure. They are frequently used to develop light emitting diode (LED) due to their unique photo¬physical properties; however, their narrow emission band causes a challenge to design white LEDs because white light emission requires emission in multiple wavelengths with broad emission bands. Here in this study, we developed CdSe quantum dots with a narrow band-edge emission band and broad defect-state emission band through a modified two-phase synthesis method. Our results revealed that defect-state emission is directly linked …
Synthesis And Biological Evaluation Of New Pyrazolebenzene-Sulphonamides As Potentialanticancer Agents And Hca I And Ii Inhibitors, Mehtap Tuğrak, Hali̇se İnci̇ Gül, Hi̇roshi̇ Sakagami̇, Rüya Kaya, İlhami̇ Gülçi̇n
Synthesis And Biological Evaluation Of New Pyrazolebenzene-Sulphonamides As Potentialanticancer Agents And Hca I And Ii Inhibitors, Mehtap Tuğrak, Hali̇se İnci̇ Gül, Hi̇roshi̇ Sakagami̇, Rüya Kaya, İlhami̇ Gülçi̇n
Turkish Journal of Chemistry
Cancer is a disease characterized by the continuous growth of cells without adherence to the rules that healthy normal cells obey. Carbonic anhydrase I and II (CA I and CA II) inhibitors are used for the treatment of some diseases. The available drugs in the market have limitations or side effects, which bring about the need to develop new drug candidate compound(s) to overcome the problems at issue. In this study, new pyrazole-sulphonamide hybrid compounds 4-[5-(1,3-benzodioxol-5-yl)-3-aryl-4,5-dihydro-1Hpyrazol- 1-yl]benzenesulphonamides (4a - 4j) were designed to discover new drug candidate compounds. The compounds 4a - 4j were synthesized and their chemical structures were …
Synthesis And Characterization Of Magnetic Nanocomposite For In Vitro Evaluation Of Irinotecan Using Human Cell Lines, Tuba Tarhan
Synthesis And Characterization Of Magnetic Nanocomposite For In Vitro Evaluation Of Irinotecan Using Human Cell Lines, Tuba Tarhan
Turkish Journal of Chemistry
In this study, magnetic O-carboxymethyl chitosan (MOCC) nanocomposite was synthesized and characterized as a drug delivery system for loading the anticancer drug irinotecan (CPT-11). To increase the drug loading capacity, MOCC was synthesized by linking the carboxyl group functionally to chitosan. Also, several critical factors such as concentration, the dose of MOCC, and contact time for optimum drug loading condition were investigated. The loading capacity of CPT-11 onto MOCC was calculated as 5.6 mg/g, and the loaded drug concentration was calculated as 0.04787 mM at pH value of 5. Besides, the cytotoxic properties of MOCC, CPT- 11 loaded MOCC (MOCC-CPT-11), …
Removal Of Cod, Aromaticity And Color Of A Pretreated Chemical Producing Industrial Wastewater: A Comparison Between Adsorption, Ozonation, And Advanced Oxidation Processes, Elçi̇n Güneş, Deni̇z İzlen Çi̇fçi̇, Ali̇ Riza Di̇nçer, Yalçin Güneş
Removal Of Cod, Aromaticity And Color Of A Pretreated Chemical Producing Industrial Wastewater: A Comparison Between Adsorption, Ozonation, And Advanced Oxidation Processes, Elçi̇n Güneş, Deni̇z İzlen Çi̇fçi̇, Ali̇ Riza Di̇nçer, Yalçin Güneş
Turkish Journal of Chemistry
A wide range of products are produced in the chemical producing industry such as textile dyes, chemicals, printing dyes and chemicals, paper chemicals, electrostatic powder dyes, and optical brighteners. The aim of this study is to investigate the treatability of chemical oxygen demand (COD), aromaticity, and color in the wastewater of this sector, where highly complex chemicals are used. Most of the studies in the literature are related to the treatment of synthetically prepared dyed wastewater. This study is important as it is carried out with real wastewater and gives results of many treatment methods. In the study, COD, UV-vis …
Tin-Sulfur Based Catalysts For Acetylene Hydrochlorination, Yibo Wu, Fuxiang Li, Xiaoqiang Luo, Gang Tian, Yunxiao Feng, Yongjun Han, Li Wang, Songmao Chu, Yunli Cao, Kesheng Cao, Xiaoming Hu, Xuejun Shi, Songtian Li, Guoxv He, Qingbin Li
Tin-Sulfur Based Catalysts For Acetylene Hydrochlorination, Yibo Wu, Fuxiang Li, Xiaoqiang Luo, Gang Tian, Yunxiao Feng, Yongjun Han, Li Wang, Songmao Chu, Yunli Cao, Kesheng Cao, Xiaoming Hu, Xuejun Shi, Songtian Li, Guoxv He, Qingbin Li
Turkish Journal of Chemistry
In the present work, tin-sulfur based catalysts were prepared using Na2SO3 and (CH3SO3)2Sn and were tested in acetylene hydrochlorination. Based on the analysis of experiments results, the acetylene conversion of (CH3SO3)2Sn/S@AC is still over 90% after a 50 h reaction, at the reaction conditions of T = 200 oC, VHCl/VC2H2 = 1.1:1.0 and C2H2-GSHV = 15 h-1. According to the results of X-ray photoelectron spectroscopy (XPS), HCl adsorption experiments, and acetylene temperature programmed desorption (C2H2-TPD), it is reasonable to conclude that the interaction between Sn and S not only can retard the oxidation of Sn2+ in catalysts but also strengthen …
Electrochemical Investigation Of The Interaction Of 2,4-D And Double Stranded Dna Using Pencil Graphite Electrodes, Gülşah Çongur
Electrochemical Investigation Of The Interaction Of 2,4-D And Double Stranded Dna Using Pencil Graphite Electrodes, Gülşah Çongur
Turkish Journal of Chemistry
2,4-dichlorophenoxyacetic acid (2,4-D) is an auxinic herbicide used to control broadleaf weeds. It is also a threatening factor for not only aquatic life but also human health due to its genotoxicity and endocrine disruptive property. Herein, the interaction between 2,4-D and double stranded DNA was investigated by using single-use pencil graphite electrodes (PGE) in combination with electrochemical techniques. The detection mechanism was based on the monitoring of the changes at the guanine oxidation signal obtained before/after surface-confined interaction of 2,4-D and DNA at the surface of PGE. The electrochemical characterization of the interaction was studied by using microscopic and electrochemical …
Synthesis, Spectroscopic, Thermal, Crystal Structure Properties And Characterization Of New Hofmann-Type-Like Clathrates With 4-Aminopyridine And Water, Zeki̇ Kartal, Onur Şahi̇n
Synthesis, Spectroscopic, Thermal, Crystal Structure Properties And Characterization Of New Hofmann-Type-Like Clathrates With 4-Aminopyridine And Water, Zeki̇ Kartal, Onur Şahi̇n
Turkish Journal of Chemistry
In this study, synthesis of two new heteronuclear tetracyanonickelate(II) clathrates based on 4-aminopyridine (4AP) and guest water (H2O) molecule and investigation of their structural properties were reported. These clathrates were characterized by using vibration spectroscopy, elemental, thermal analysis and single crystal X-ray diffraction (SC-XRD) techniques. Examining the elemental and spectral data of these clathrates, it was observed that the formulas [Zn(II)(4AP)2Ni(μ-CN)2 (CN)2]·6H2O and [Cu(II)(4AP)4Ni(μ- CN)2 (CN)2]·H2O were defined their structures. General information about the structural properties of these clathrates in single crystal form has been obtained by considering the changes in the characteristic peaks of the cyanide group and the …
Integrated 3d-Qsar, Molecular Docking, And Molecular Dynamics Simulation Studies On 1,2,3-Triazole Based Derivatives For Designing New Acetylcholinesterase Inhibitors, Khalil El Khatabi, Ilham Aanouz, Reda El-Mernissi, Atul Kumar Singh, Mohammed Aziz Ajana, Tahar Lakhlifi, Shashank Kumar, Mohammed Bouachrine
Integrated 3d-Qsar, Molecular Docking, And Molecular Dynamics Simulation Studies On 1,2,3-Triazole Based Derivatives For Designing New Acetylcholinesterase Inhibitors, Khalil El Khatabi, Ilham Aanouz, Reda El-Mernissi, Atul Kumar Singh, Mohammed Aziz Ajana, Tahar Lakhlifi, Shashank Kumar, Mohammed Bouachrine
Turkish Journal of Chemistry
Alzheimer's disease (AD) is a multifactorial and polygenic disease. It is the most prevalent reason for dementia in the aging population. A dataset of twenty-six 1,2,3-triazole-based derivatives previously synthetized and evaluated for acetylcholinesterase inhibitory activity were subjected to the three-dimensional quantitative structure-activity relationship (3D-QSAR) study. Good predictability was achieved for comparative molecular field analysis (CoMFA) (Q2 = 0.604, R2 = 0.863, rext2 = 0.701) and comparative molecular similarity indices analysis (CoMSIA) (Q2 = 0.606, R2 = 0.854, rext2 = 0.647). The molecular features characteristics provided by the 3D-QSAR contour plots were quite useful for designing and improving the activity of …
Evaluation Of The Fuel Cell Performances Of Tio2/Pan Electrospun Carbon-Based Electrodes, Sema Aslan
Evaluation Of The Fuel Cell Performances Of Tio2/Pan Electrospun Carbon-Based Electrodes, Sema Aslan
Turkish Journal of Chemistry
Electrocatalytic effect of the untreated and TiO2+polyacrylonitrile (PAN) modified discarded battery coal (DBC) and pencil graphite electrodes (PGE) were evaluated in fuel cell (FC) applications. TiO2+PAN solution is coated on PGE and DBC electrodes by electrospinning. According to the FESEM and EDS characterizations, TiO2 and PAN nanofibers are found to be approximately 40 and 240 nm in size. TiO2+PAN/PGE showed the best FC performances with 2.00 A cm-2 current density and 5.05 W cm-2 power density values, whereas TiO2+PAN/DBC showed 0.68 A cm-2 current density and 0.62 W cm-2 power density values. Electrochemical characterizations of PGE and TiO2+PAN/PGE electrodes were …
The Impact Of Alkaline Earth Oxides On Bi2o3 And Their Catalytic Activities In Photodegradation Of Bisphenol A, Ümran Ünlü, Sevgi̇ Kemeç, Güli̇n Selda Pozan Soylu
The Impact Of Alkaline Earth Oxides On Bi2o3 And Their Catalytic Activities In Photodegradation Of Bisphenol A, Ümran Ünlü, Sevgi̇ Kemeç, Güli̇n Selda Pozan Soylu
Turkish Journal of Chemistry
The BPA into wastewater has posed a threat to environment and human health. Hence, we aimed to eliminate BPA in a short time and with a rapid degradation rate from food wastewater. Herein, the effects of different alkaline-earth oxide doped with Bi2O3 nanoparticles on the photocatalytic degradation of bisphenol A were investigated. SrO-Bi2O3, CaO-Bi2O3, and MgO-Bi2O3 binary oxides were prepared by wet-impregnation method. The structural and optical features of catalysts were clarified BET, XRD, DRS, FT-IR, PL, and SEM techniques. The photocatalytic activities of catalysts were compared for different light sources. Considering that the characterization analysis and experimental results, the …
Unsymmetrical Zinc Phthalocyanines Containing Thiophene And Amine Groups As Donor For Bulk Heterojunction Solar Cells, Gülnur Keser Karaoğlan, Öznur Dülger Kutlu, Ahmet Altindal
Unsymmetrical Zinc Phthalocyanines Containing Thiophene And Amine Groups As Donor For Bulk Heterojunction Solar Cells, Gülnur Keser Karaoğlan, Öznur Dülger Kutlu, Ahmet Altindal
Turkish Journal of Chemistry
Photovoltaic technology is an alternative resource for renewable and sustainable energy and low costs organic photovoltaic devices such as bulk-heterojunction (BHJ) solar cells, which are selective candidates for the effective conversion of solar energy into electricity. Asymmetric phthalocyanines containing electron acceptor and donor groups create high photovoltaic conversion efficiency in dye sensitized solar cells. In this study, a new unsymmetrical zinc phthalocyanine was designed and synthesized including thiophene and amine groups at peripherally positions for BHJ solar cell. The structure of the targeted compound (4) was characterized comprehensively by FT-IR, UV-Vis, 1H-NMR, and MALDI-TOF MS spectroscopies. The potential of this …
Synthesis And Molecular Docking Study Of Novel Covid-19 Inhibitors, Zuhal Gerçek, Deni̇z Ceyhan, Erol Erçağ
Synthesis And Molecular Docking Study Of Novel Covid-19 Inhibitors, Zuhal Gerçek, Deni̇z Ceyhan, Erol Erçağ
Turkish Journal of Chemistry
In 2020, the world tried to combat the corona virus (COVID-19) pandemic. A proven treatment method specific to Severe Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2) is still not found. In this study, seven new antiviral compounds were designed for COVID-19 treatment. The ability of these compounds to inhibit COVID-19's RNA processing was calculated by the molecular docking study. It has been observed that the compounds can have high binding affinities especially against NSP12 (between -9.06 and -8.00 kcal/mol). The molecular dynamics simulation of NSP12-ZG 7 complex proved the stability of interaction. The synthesis of two most active molecules was performed by …
Thermal Stresses In Sofc Stacks: The Role Of Mismatch Among Thermalconductivity Of Adjacent Components, Özgür Aydin, Go Matsumoto, Yusuke Shiratori
Thermal Stresses In Sofc Stacks: The Role Of Mismatch Among Thermalconductivity Of Adjacent Components, Özgür Aydin, Go Matsumoto, Yusuke Shiratori
Turkish Journal of Chemistry
Generating power from renewable biogas in solid oxide fuel cells (SOFCs) is an environment-friendly, efficient, and promising energy conversion process. Biogas can be used in SOFCs via a reforming process for which dry reforming is more suitable as the reforming agent exists in the biogas mixture. Biogas can be directly reformed to H2 -rich fuel stream in the anode chamber of a SOFC by the heat released during power generation. Exploiting the heat and water produced in the SOFC for internal reforming of biogas makes the energy conversion process very efficient; however, various challenges are reported. Thus, indirect internal reforming …
Electrochemical Evaluation Of The Desloratadine At Bismuth Film Electrode In The Presence Of Cationic Surfactant: Highly Sensitive Determination In Pharmaceuticals And Human Urine By Linear Sweep-Cathodic Stripping Voltammetry, Yalçin Altunkaynak, Günay Önal, Abdulkadi̇r Levent
Electrochemical Evaluation Of The Desloratadine At Bismuth Film Electrode In The Presence Of Cationic Surfactant: Highly Sensitive Determination In Pharmaceuticals And Human Urine By Linear Sweep-Cathodic Stripping Voltammetry, Yalçin Altunkaynak, Günay Önal, Abdulkadi̇r Levent
Turkish Journal of Chemistry
In this study, the electrochemical properties of desloratadine, which is in the second generation antihistamines group, were determined by bismuth film electrode (BiFE) in aqueous and aqueous/surfactant solutions. This compound gave an irreversible and diffusion-controlled reduction peak at about -1.65 V by cyclic voltammetry. It was found that the addition of cationic surfactants (cetyltrimethylammonium bromide (CTAB) increased the reduction current signal of desloratadine, while anionic (sodium dodecylsulfate (SDS) and nonionic (Tween 80) surfactants were found to have an adverse effect. Using linear sweep-cathodic stripping voltammetry, the analytical signal showed a linear correlation with a concentration of 0.1 to 4 μM …
Synthesis Of Hydroxy Benzoin/Benzil Analogs And Investigation Of Their Antioxidant,Antimicrobial, Enzyme Inhibition, And Cytotoxic Activities, Nuretti̇n Yayli, Gözde Kiliç, Gonca Çeli̇k, Nuran Kahri̇man, Şeyda Kanbolat, Ari̇f Bozdeveci̇, Şengül Alpay Karaoğlu, Rezzan Ali̇yazicioğlu, Hasan Erdi̇nç Selli̇tepe, İnci̇ Seli̇n Doğan, Ali̇ Aydin
Synthesis Of Hydroxy Benzoin/Benzil Analogs And Investigation Of Their Antioxidant,Antimicrobial, Enzyme Inhibition, And Cytotoxic Activities, Nuretti̇n Yayli, Gözde Kiliç, Gonca Çeli̇k, Nuran Kahri̇man, Şeyda Kanbolat, Ari̇f Bozdeveci̇, Şengül Alpay Karaoğlu, Rezzan Ali̇yazicioğlu, Hasan Erdi̇nç Selli̇tepe, İnci̇ Seli̇n Doğan, Ali̇ Aydin
Turkish Journal of Chemistry
In this study, hydroxy benzoin (1-7), benzil (8-14), and benzoin/benzil-O-β-D-glucosides (15-25) were synthesized to investigate their biological activities. An efficient method for synthesizing hydroxy benzoin compounds (1-7) was prepared from four different benzaldehydes using an ultrasonic bath. Then, antioxidant (FRAP, CUPRAC, and DPPH), antimicrobial (3 Gram (-), 4/6 Gram (+), one tuberculosis and one fungus), and enzyme inhibition (acetylcholinesterase, butyrylcholine esterase, tyrosinase, α-amylase, and α- glucosidase) for the all synthesized compounds (1-25) were evaluated. And also, four most active compounds (4, 12, 18a+b, and 25) from each group were evaluated to the human cervical cancer cell line (HeLa) and anticancer …
Development Of A Functional Impedimetric Immunosensor For Accurate Detection Of Thy-Roid-Stimulating Hormone, Engi̇n Asav
Development Of A Functional Impedimetric Immunosensor For Accurate Detection Of Thy-Roid-Stimulating Hormone, Engi̇n Asav
Turkish Journal of Chemistry
Thyroid-stimulating hormone (TSH), which regulates the synthesis of thyroid gland hormones affecting the whole metabo¬lism, is a pituitary hormone. Determination of TSH is crucial for monitoring thyroid gland-related disorders and some metabolic diseases. In this study, a nonlabeled immunosensor based on covalent immobilization of anti-TSH antibody by using the formation of self-as-sembled monolayers (SAM) of 4-mercaptophenylacetic acid (4-MPA) and functionalization of carboxyl ends with 1-ethyl-3-(3-dimeti-laminopropil) carbodiimide (EDC)/N-Hydroxysuccinimide (NHS) was fabricated for detection of TSH. Immobilization steps including the concentration of 4-MPA, the concentration of anti-TSH antibody, and duration of anti-TSH antibody incubation were optimized by utilizing electrochemical impedance spectroscopy. Under …
Synthesis And Antioxidant Activities Of New Nickel(Ii) Complexes Derived From 4-Benzy¬Loxysalicylidene-S-Methyl/Propyl Thiosemicarbazones, Songül Eğlence Bakir
Synthesis And Antioxidant Activities Of New Nickel(Ii) Complexes Derived From 4-Benzy¬Loxysalicylidene-S-Methyl/Propyl Thiosemicarbazones, Songül Eğlence Bakir
Turkish Journal of Chemistry
Six nickel(II) complexes of the N2O2 chelating thiosemicarbazones were synthesized using N1-4-benzyloxysalicylidene-S-methyl/propyl thiosemicarbazone and methoxy-substitute-salicylaldehydes in the presence of Ni(II) ion by template reaction. The structures of thiosemicarbazones and nickel(II) complexes were characterized by elemental analysis, UV-Vis, IR, and 1H-NMR spec¬troscopies. The structure of the N1-4-benzyloxysalicylidene-S-propyl thiosemicarbazone (2) was determined by X-ray single-crystal diffraction method. The total antioxidant capacities of synthesized compounds were evaluated by using cupric reducing antioxidant capacity (CUPRAC) method. The thiosemicarbazones exhibited more potent antioxidant capacity than Ni(II) complexes. Trolox equiv¬alent antioxidant capacity (TEAC) of 1c was found highest in tested nickel(II) complexes. In addition, antioxidant activities …
High Capacity Gas Capture And Selectivity Properties Of Triazatruxene-Basedultramicroporous Hyper-Crosslinked Covalent Polymer, Ali̇ Eni̇s Sadak
High Capacity Gas Capture And Selectivity Properties Of Triazatruxene-Basedultramicroporous Hyper-Crosslinked Covalent Polymer, Ali̇ Eni̇s Sadak
Turkish Journal of Chemistry
Tuning the selective sorption features of microporous organic networks is of great importance for subsequent applications in gas uptake and hiding, while it is more attractive in terms of being both time and cost effective to realize these optimizations without using functional groups in the core and linker. "Knitting" is one of the easiest and most used method to obtain a broad scope of hyper-crosslinked polymers on a large scale from aromatic structures that do not contain functional groups for polymerization. By the use of Knitting method, a hypercrosslinked covalent ultramicroporous organic polymer was obtained via stepwise process from using …
Spectrophotometric And Colorimetric Determination Of Gallium (Iii) With P-Aminohippuricacid-Functionalized Citrate Capped Gold Nanoparticles, Asi̇ye Aslihan Avan
Spectrophotometric And Colorimetric Determination Of Gallium (Iii) With P-Aminohippuricacid-Functionalized Citrate Capped Gold Nanoparticles, Asi̇ye Aslihan Avan
Turkish Journal of Chemistry
A new technique for sensing Ga(III) concentration based on polyvinyl alcohol-citrate capped gold nanoparticle-p-aminohippuric acid hybrid (or three-layer core-shell configurations) has been demonstrated. The p-aminohippuric acid capped citrate-gold nanoparticles were comfortably agglomerated in the presence of Ga(III), and the color of the reaction quickly turned from red to violet or blue. Under the detection conditions, a good linear relationship was ideally obtained between the ratio of the absorbance intensity at 620 nm to that at 520 nm (A620/A520). The linear response range, the detection, and quantification limit was 34.9-418.3 μg/L and 7.6 μg/L, and 25 μg/L, respectively. To reflect the …
Uv-Visible Spectroscopic Study On Multi-Staged Film Formation Mechanisms Of Graphene Oxide-Doped Polystyrene Latex (Ps Latex/Go) Nanocomposites, Asef Etemadi, Bariş Demi̇rbay, Şazi̇ye Uğur
Uv-Visible Spectroscopic Study On Multi-Staged Film Formation Mechanisms Of Graphene Oxide-Doped Polystyrene Latex (Ps Latex/Go) Nanocomposites, Asef Etemadi, Bariş Demi̇rbay, Şazi̇ye Uğur
Turkish Journal of Chemistry
We report the effect of graphene oxide (GO) on film formation and morphological properties of GO-doped polystyrene (PS) latex nanocomposite (PS latex/GO) films using UV-visible absorption spectroscopy and scanning electron microscopy (SEM). PS latex particles were synthesized through emulsion polymerization technique and then nanocomposite blends, each containing different concentrations of GO ranging from 0 wt% to 70 wt%, were obtained. Prepared blends were deposited on glass plates via drop-casting method and coated substrates were annealed at different temperatures between 100 °C and 250 °C. At each annealing temperature, transmitted light intensity of nanocomposite films was recorded. Void closure and Prager-Tirrell …
Scalable Activated Carbon/Graphene Based Supercapacitors With Improved Capacitanceretention At High Current Densities, İffet Işil Gürten
Scalable Activated Carbon/Graphene Based Supercapacitors With Improved Capacitanceretention At High Current Densities, İffet Işil Gürten
Turkish Journal of Chemistry
Scalable, highly stable supercapacitor electrodes were developed from the mixture of a tea factory waste based activated carbon (AC) and a low-cost electrochemical exfoliated graphene (EEG). The hybrid electrodes showed notably enhanced stability at high current densities. The AC sample was prepared by chemical method and exposed to a further heat treatment to enhance electrochemical performance. Graphene used in the preparation of hybrid electrodes was obtained by direct electrochemical exfoliation of graphite in an aqueous solution. Detailed structural characterization of AC, EEG, and hybrid material was performed. The original electrochemical performances of AC and EEG were examined in button size …
Synthesis, Spectroscopic, Thermal, Crystal Structure Properties, And Characterization Of New Hofmann-Td-Type Complexes With 3-Aminopyridine, Zeki̇ Kartal, Onur Şahi̇n
Synthesis, Spectroscopic, Thermal, Crystal Structure Properties, And Characterization Of New Hofmann-Td-Type Complexes With 3-Aminopyridine, Zeki̇ Kartal, Onur Şahi̇n
Turkish Journal of Chemistry
In this study, synthesis of two new tetracyanocadmate(II) and tetracyanozincate(II) complexes based on 3-aminopyridine (3AP) and investigation of their structural properties were reported. These complexes were characterized by using vibration spectroscopy, elemental, thermal analysis and single crystal X-ray diffraction (SC-XRD) techniques. Investigation of the elemental, spectral and single crystal data of these complexes showed that the formulas [Cd(3AP)2Zn(μ4-CN)4]n (1) and [Cd(3AP) 2Cd(μ4-CN)4]n (2) fully explained their crystal structure. General information about the structural and chemical properties of these complexes obtained in single crystal form was obtained by observing the changes in the characteristic peaks of the 3AP with the [Zn(μ4-CN)4]2- …
Phenolic Compounds, Essential Oil Composition, And Antioxidant Activity Of Angelica Pur-Purascens (Avé-Lall.) Gill, Semra Alkan Türkuçar, Ayça Aktaş Karaçeli̇k, Mustafa Karaköse
Phenolic Compounds, Essential Oil Composition, And Antioxidant Activity Of Angelica Pur-Purascens (Avé-Lall.) Gill, Semra Alkan Türkuçar, Ayça Aktaş Karaçeli̇k, Mustafa Karaköse
Turkish Journal of Chemistry
In this study, methanol extracts (MEs) and essential oil (EO) of Angelica purpurascens (Avé-Lall.) Gill obtained from different parts (root, stem, leaf, and seed) were evaluated in terms of antioxidant activity, total phenolics, compositions of phenolic compound, and essential oil with the methods of 2,2-azino-bis(3ethylbenzo-thiazoline-6-sulfonic acid (ABTS•+), 2,2-diphenyl-1-picrylhydrazil (DPPH•) radical scavenging activities, and ferric reducing/antioxidant power (FRAP), the Folin?Ciocalteu, liquid chromatography- tandem mass spectrometry (LC-MS/MS), and gas chromatography-mass spectrometry (GC-MS), respectively. The root extract of A. Purpurascens exhibited the highest ABTS•+, DPPH•, and FRAP activities (IC50: 0.05 ± 0.0001 mg/mL, IC50: 0.06 ± 0.002 mg/mL, 821.04 ± 15.96 μM TEAC …
Synthesis Of Ni/Al2o3 Catalysts Via Alkaline Polyol Method And Hydrazine Reduction Method For The Partial Oxidation Of Methane, Ezgi̇ Bayrakdar Ateş, Tuba Gürkaynak Altinçeki̇ç, Mehmet Ali̇ Faruk Öksüzömer
Synthesis Of Ni/Al2o3 Catalysts Via Alkaline Polyol Method And Hydrazine Reduction Method For The Partial Oxidation Of Methane, Ezgi̇ Bayrakdar Ateş, Tuba Gürkaynak Altinçeki̇ç, Mehmet Ali̇ Faruk Öksüzömer
Turkish Journal of Chemistry
Nickel catalysts supported on γ-Al2O3 were synthesized in the presence of polyvinylpyrrolidone (PVP) using both alkaline polyol method and hydrazine reduction method while fixing the weight ratio of [(PVP)]/[Ni(CH3COO)2·4H2O] at 2. The effects of hydrazine [N2H5 OH]/[Ni] and [NaOH]/[Ni] molar ratios on the structural properties of the catalysts were characterized by transmission electron microscopy (HRTEM) and by X-ray diffraction (XRD). The average of monodispersed Ni nanoparticles ranged between 8.0 and 13.0 nm. The catalytic tests were performed for the partial oxidation of methane in the temperature range of 600-800 °C under a flow rate of 157,500 L kg-1 hr-1 with …
Detection Of Bacteria Using Antimicrobial Polymer Derived Via Ring-Opening Metathesis (Romp) Pathway, N Ceren Süer, Tüli̇n Arasoğlu, Hüsnü Cankurtaran, Mustafa Okutan, Markus Gallei, Tarik Eren
Detection Of Bacteria Using Antimicrobial Polymer Derived Via Ring-Opening Metathesis (Romp) Pathway, N Ceren Süer, Tüli̇n Arasoğlu, Hüsnü Cankurtaran, Mustafa Okutan, Markus Gallei, Tarik Eren
Turkish Journal of Chemistry
There is growing interest in the detection of bacteria in consumables, for example, in the food and water sectors. In this study, the aim was to produce a polymer-based bacteria biosensor via ROMP (ring opening metathesis polymerization). In the first part of the study, block and random copolymers were synthesized, and their biocidal activities were tested on the glass surface. Interdigitated electrode arrays coated with the polymers possessing the highest activity were used to screen the affinity towards different bacterial strains by monitoring impedance variations in real-time. The polymer-coated electrode could detect gram-positive and gram-negative bacteria strains at a concentration …
Evaluation Of Quercetin As A Potential Β-Lactamase Ctx-M-15 Inhibitor Via The Molecular Docking, Dynamics Simulations, And Mmgbsa, Emrah Sariyer, Ayşegül Saral
Evaluation Of Quercetin As A Potential Β-Lactamase Ctx-M-15 Inhibitor Via The Molecular Docking, Dynamics Simulations, And Mmgbsa, Emrah Sariyer, Ayşegül Saral
Turkish Journal of Chemistry
Antimicrobial resistance (AMR) threatens millions of people around the world and has been declared a global risk by the World Economic Forum. One of the important AMR mechanisms in Enterobacteriaceae is the production of extended-spectrum β-lactamases. The most common ESBL, CTX-M β-lactamases, is spread to the world by CTX-M-15 and CTX-M-14. Sulbactam, clavu-lanic acid, and tazobactam are first-generation β-lactamase inhibitors and avibactam is a new non-β-lactam β-lactamase inhibitor. We studied that avibactam, sulbactam, clavulanic acid, tazobactam, and quercetin natural flavonoids were docked to target protein CTX-M-15. Subsequently, the complexes were simulated using the molecular dynamics simulations method during 100 ns …
Feature Of Catalysis On Bimetallic Alloys Zr With V, Mo, And Fe In The Reaction Of Methanol Oxidation, Arif Efendi, Lala Magerramova, Adila Aliyeva, Lyudmila Kozharova, Elmir Babayev
Feature Of Catalysis On Bimetallic Alloys Zr With V, Mo, And Fe In The Reaction Of Methanol Oxidation, Arif Efendi, Lala Magerramova, Adila Aliyeva, Lyudmila Kozharova, Elmir Babayev
Turkish Journal of Chemistry
Catalytic behaviors of bimetallic catalysts-alloys of zirconium with vanadium, molybdenum, and iron was investigated in the oxidative dehydrogenation of methanol. The conditions for the formation of the catalyst's active surface were revealed. The conversion of methanol into formaldehyde, dimethyl ether, and dimethoxymethane on bimetallic catalysts was studied. The characterization of catalysts was performed by XRD, XPS, and SEM. It was shown that the activity of samples increases after O2 + H2 treatment and was associated with segregation of the active components of alloys (V, Mo) on the surface of catalysts and realization of their optimal oxidation state under catalysis conditions.
Green Biosynthesis, Characterization, And Cytotoxic Effect Of Magnetic Iron Nanoparticles Using Brassica Oleracea Var Capitata Sub Var Rubra (Red Cabbage) Aqueous Peel Extract, Ömer Erdoğan, Sali̇h Paşa, Gülen Meli̇ke Demi̇rbolat, Özge Çevi̇k
Green Biosynthesis, Characterization, And Cytotoxic Effect Of Magnetic Iron Nanoparticles Using Brassica Oleracea Var Capitata Sub Var Rubra (Red Cabbage) Aqueous Peel Extract, Ömer Erdoğan, Sali̇h Paşa, Gülen Meli̇ke Demi̇rbolat, Özge Çevi̇k
Turkish Journal of Chemistry
The green method of nanoparticle synthesis, which is an environment and living-friendly method, is an updated subject that has appeared as an alternative to conventional methods such as physical and chemical synthesis. In this presented study, the green synthesis of magnetic iron oxide nanoparticles (IONPs) from iron (III) chloride by using Brassica oleracea var. capitata sub.var. rubra aqueous peel extract has been reported. The prepared IONPs were characterized with fourier-transform infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-VIS), zeta potential, scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX). The cytotoxic effects of IONPs on MCF-7 breast cancer cell line were studied …
Theoretical Investigation On The Addition Reaction Of The Germylenoid H2gelicl With Acetone, Xiaolin Zhang, Bingfei Yan, Wenzuo Li
Theoretical Investigation On The Addition Reaction Of The Germylenoid H2gelicl With Acetone, Xiaolin Zhang, Bingfei Yan, Wenzuo Li
Turkish Journal of Chemistry
In this work, theoretical calculations were performed on the addition reaction of the germylenoid H2GeLiCl with acetone. The DFT M06-2X method was used to optimize the geometries of the whole stationary points on the potential energy surfaces and the QCISD method to calculate the single-point energy. The results reveal that the addition reaction of H2GeLiCl with acetone firstly generates an oxagermacyclopropane c-H2GeOC(CH3)2 and then c-H2GeOC(CH3)2 further reacts with acetone along two possible pathways, pathway I and pathway II, in which the 2,4-dioxagermolane is formed at the end of pathway I and 2,5-dioxagermolane is formed at the end of pathway II, …
Preconcentration Of Rifampicin Prior To Its Efficient Spectroscopic Determination In The Wastewater Samples Based On A Nonionic Surfactant, Afaq Ullah Khan, Faheem Shah, Rafaqat Ali Khan, Bushra Ismail, Asad Muhammad Khan, Haji Muhammad
Preconcentration Of Rifampicin Prior To Its Efficient Spectroscopic Determination In The Wastewater Samples Based On A Nonionic Surfactant, Afaq Ullah Khan, Faheem Shah, Rafaqat Ali Khan, Bushra Ismail, Asad Muhammad Khan, Haji Muhammad
Turkish Journal of Chemistry
Every year, tuberculosis affects the lungs of millions of people and rifampicin is the commonly used medicine for its treatment due to its antibiotic nature. The frequent use of rifampicin may lead to its increased concentration in the water resources. This research work is focused on the cloud point extraction (CPE) procedure for the preconcentration of rifampicin prior to its determination in water. The UV/vis spectrophotometric method was adapted for the measurement of rifampicin content after the phase separation. Triton-X 100 was used as the nonionic surfactant which contains hydrophilic polyethylene chain feasible for the extraction of analyte. Various analytical …