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2022

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Articles 17551 - 17580 of 18299

Full-Text Articles in Physical Sciences and Mathematics

Preparation Of Moo3/Mos2-E Composite For Enhanced Photoelectrocatalytic Removal Of Antimony From Petrochemical Wastewaters, Sevi̇l Akçağlar Jan 2022

Preparation Of Moo3/Mos2-E Composite For Enhanced Photoelectrocatalytic Removal Of Antimony From Petrochemical Wastewaters, Sevi̇l Akçağlar

Turkish Journal of Chemistry

By doping of MoO3 to MoS2-E, MoO3/MoS2-E composite was produced to treat the antimony (Sb+5) from raw petrochemical industry wastewater. The effects of increasing MoO3/MoS2-E composite concentrations (0.01, 0.06, 0.50, 1.20, and 6 mg/L), times (5 min, 10 min, 20 min, 60 min, 80 min), and simulated sun light powers (2, 15, and 26 mW/m2) on the removal of Sb+5 was researched. According to X-ray diffraction (XRD), MoS2-E exhibited a pure hexagonal structure with peaks at 2θ data of 15.56, 33.78, 40.59, and 61.43 cm …

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Homonuclear Nickel(Ii) Metal-Organic Framework-Type Supramolecule: Adsorption And Emission Properties, Idongesit Mbonu, Olusegun Abiola, Hamzah Bawa Jan 2022

Homonuclear Nickel(Ii) Metal-Organic Framework-Type Supramolecule: Adsorption And Emission Properties, Idongesit Mbonu, Olusegun Abiola, Hamzah Bawa

Turkish Journal of Chemistry

Coordination-driven self-assembly of nickel (II) ions with equimolar amounts of 1, 10 phenanthroline, and benzoic acid was used to create homonuclear nickel (II) MOF-type supramolecule. Single crystal X-ray diffraction, scanning electron microscopy, differential scanning calorimetry, photoluminescence measurement, FT-IR, UV-visible spectroscopy, and nitrogen physisorption measurement were used to characterize the compound. The single crystal X-ray diffraction study reveals that the synthesized compound is two-dimensional with pores in the structure. The homonuclear nickel (II) MOF-type supramolecule crystallized in a triclinic crystal system, with space group P-1 (No.2) and unit cell parameters a = 9.2053(4) Ǻ, b = 13.2964(5) Ǻ, c = 15.8998(6) …

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The 4-(Dimethylaminoalkyl)Piperazine Inhibitors Of Α-Glucosidase: Allosteric Enzyme Inhibition And Identification Of Interacting Chemical Groups, Usman Ghani, Sajda Ashraf, Zaheer Ul Haq, Zafer Asim Kaplancikli, Fati̇h Demi̇rci̇, Yusuf Özkay, Sibtain Afzal Jan 2022

The 4-(Dimethylaminoalkyl)Piperazine Inhibitors Of Α-Glucosidase: Allosteric Enzyme Inhibition And Identification Of Interacting Chemical Groups, Usman Ghani, Sajda Ashraf, Zaheer Ul Haq, Zafer Asim Kaplancikli, Fati̇h Demi̇rci̇, Yusuf Özkay, Sibtain Afzal

Turkish Journal of Chemistry

In continuation of our interest in identifying new α-glucosidase inhibitors with potential to become antidiabetic drugs, this work focuses on the study of 4-(dimethylaminoalkyl)piperazine-1-carbodithioate derivatives as α-glucosidase inhibitors. The eight heterocyclic piperazine-dithiocarbamate complexes studied in this work contain a variety of substitutions on their benzene ring exhibiting potent, noncompetitive inhibition of α-glucosidase. Dithiocarbamate and piperazine moieties are important pharmacophores with promising therapeutic prospects featuring facilitated drug delivery due to their lipophilic nature in addition to their α-glucosidase inhibitory activity. Enzyme kinetics, molecular dynamics simulations, and docking studies revealed that the target compounds bind to a new allosteric site that is …

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Ultrasound Phantom With Solids Mimicking Cancerous Tissue For Needle Breast Biopsy, Işik İpek Avci Yayla, Meli̇s Bi̇lal, Artür Salmaslioğlu, Erol Erçağ, Esma Sezer, Belkis Ustamehmetoglu Jan 2022

Ultrasound Phantom With Solids Mimicking Cancerous Tissue For Needle Breast Biopsy, Işik İpek Avci Yayla, Meli̇s Bi̇lal, Artür Salmaslioğlu, Erol Erçağ, Esma Sezer, Belkis Ustamehmetoglu

Turkish Journal of Chemistry

This study aimed at synthesizing hydrogels to simulate opaque breast tissue (BT) and coloured cancerous tissues (CT) at different densities of the designed phantom to improve the biopsy-related skills along with ultrasonography. Both tissues are tear-resistant and therefore, the phantom can be trained multiple times in order to lower the price and improve the eye-hand coordination of users. For this purpose, self-healing (SH) polyacrylamide (PAAm) hydrogels (SH hydrogel) obtained by free-radical polymerization of AAm, in the presence of chemical cross-linker, BAAm, physical cross-linker stearyl methacrylate, C18, and ammonium persulfate APS as initiator were used in the design of phantoms. Psyllium …

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Schiff Base Containing Pyridine Groups Functionalized Water-Soluble Phthalocyanine: Synthesis, Photo-Physicochemical Properties, And Bovine Serum Albumin Binding Behavior, Öznur Dülger, Ali̇ Erdoğmuş Jan 2022

Schiff Base Containing Pyridine Groups Functionalized Water-Soluble Phthalocyanine: Synthesis, Photo-Physicochemical Properties, And Bovine Serum Albumin Binding Behavior, Öznur Dülger, Ali̇ Erdoğmuş

Turkish Journal of Chemistry

The novel pyridine bearing schiff base substituted metal-free (9), zinc(II) phthalocyanine (10), and its quaternized derivative (11) were designed and synthesized. These phthalocyanines were fully characterized by spectroscopic methods (FT-IR, UV-Vis, MALDI-TOF, and 1H NMR). The photo-physicochemical properties of these phthalocyanines were investigated in both DMSO and DMF for 10 and in both DMSO and aqueous solution for 11. The addition of pyridine bearing Schiff base groups as peripheral ligands showed an improvement in the photophysical and photochemical properties. In addition, a spectroscopic investigation of the binding behavior of the water-soluble zinc (II) phthalocyanine …

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Comparison Of Denaturing Agent Effects In Enzymatic N-Glycan Release For Human Plasma N-Glycan Analysis, Haci Mehmet Kayili, Rokia Sakhta, Beki̇r Sali̇h Jan 2022

Comparison Of Denaturing Agent Effects In Enzymatic N-Glycan Release For Human Plasma N-Glycan Analysis, Haci Mehmet Kayili, Rokia Sakhta, Beki̇r Sali̇h

Turkish Journal of Chemistry

Glycosylation is an essential posttranslational modification observed in the living proteome. Glycosylation profiles in glycoproteins can change in commonly observed diseases such as cancer. Identifying these changes is crucial in discovering new biomarkers for the early diagnosis of cancer. One of the main steps of N-glycan analysis is to release N-glycans from glycoproteins by specific enzymes. The study compares common denaturing agent combinations used in N-glycan release methods. In the study, human plasma was used to test the release methods of N-glycans containing different detergent combinations. The released N-glycans were labeled with the procainamide tag, …

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Interaction Of The Nitrogen-Containing Carbon Backbone Polymers With Essential Α-Amino Acids, Andrey Sorokin, Maria Lavlinskaya Jan 2022

Interaction Of The Nitrogen-Containing Carbon Backbone Polymers With Essential Α-Amino Acids, Andrey Sorokin, Maria Lavlinskaya

Turkish Journal of Chemistry

The aim of this work is to research the interactions of water-soluble nitrogen-containing copolymers with essential amino acids in aqueous media. For this, poly(N-vinylformamide-co-N-vinylimidazole) and poly(N-vinylcaprolactam-co-N-vinylimidazole) random copolymers were synthesized by free radical polymerization. The products obtained are characterized by GPC, DLS, and FTIR. The copolymers have a narrow molecular weight distribution and low dispersity. The interactions of the obtained copolymers with histidine, proline, arginine, leucine, phenylalanine, and methionine were researched by UV spectroscopy, FTIR, and TEM. It was found that conjugation of the copolymers with amino acids correlates with the copolymer …

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New 2-D Silver(I) Coordination Network Constructed From Thiomethyl Group-Substituted P-Tert-Butylthiacalix[4]Arene, Huri̇ye Akdaş Kiliç, Ernest Graf, Mi̇r Wai̇s Hossei̇ni̇, Nathali̇e Kyri̇tsakas Jan 2022

New 2-D Silver(I) Coordination Network Constructed From Thiomethyl Group-Substituted P-Tert-Butylthiacalix[4]Arene, Huri̇ye Akdaş Kiliç, Ernest Graf, Mi̇r Wai̇s Hossei̇ni̇, Nathali̇e Kyri̇tsakas

Turkish Journal of Chemistry

New ligand based on p-tertbutyltetrathiacalix[4]arene blocked in 1,3-alternate conformation, was achieved via a multistep synthesis with the introduction of thiomethylpropoxy groups on the lower rim which leads to a neutral tecton. The combination of this p-tertbutyltetrathiacalix[4]arene (p-TCA-2), in 1, 3-alternate imposed conformation, with tetrahedral Ag(I)SbF6 salt, leads to the formation of neutral, new 2-D coordination network, which was structurally investigated in the solid state by X-ray diffraction methods on a single crystal.

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Synthesis, Characterization, Computational Analyses, In Silico Admet Studies, And Inhibitory Action Against Sars-Cov-2 Main Protease (Mpro) Of A Schiff Base, Songül Şahi̇n, Necmi̇ Dege Jan 2022

Synthesis, Characterization, Computational Analyses, In Silico Admet Studies, And Inhibitory Action Against Sars-Cov-2 Main Protease (Mpro) Of A Schiff Base, Songül Şahi̇n, Necmi̇ Dege

Turkish Journal of Chemistry

COVID-19 disease caused by the severe acute respiratory syndrome coronavirus (SARS-CoV-2) has struck the whole world and raised severe health, economic, and social problems. Many scientists struggled to find a vaccine or an antiviral drug. Eventually, both vaccines and recommended drugs, repurposed drugs, or drug combinations were found, but new strains of SARS-CoV-2 continue to threaten human life and health. As part of the fight against COVID-19 disease, this study involves an in silico molecular docking analysis on the main protease (Mpro) of SARS-CoV-2. To this aim, a Schiff base compound was synthesized and characterized using spectroscopic techniques, including X-ray, …

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Influence Of Acid Activation On Hydrogen Adsorption Properties Of Analcime-Rich Tuff From Turkey, Meryem Akbelen, Nurgül Özbay Jan 2022

Influence Of Acid Activation On Hydrogen Adsorption Properties Of Analcime-Rich Tuff From Turkey, Meryem Akbelen, Nurgül Özbay

Turkish Journal of Chemistry

In this study, structural, thermal, and hydrogen (H2) adsorption properties of natural analcime-rich zeolite tuff (A) from Trakya (Turkey) and that of acid-treated forms investigated. Analcime mineral was treated with 0.1, 0.5, 1, 2, and 3 M HCl solutions at 80 °C for 5 h. Differences in structural and thermal behaviors of the analcime samples before and after acid- treatment were examined by X-ray fluorescence spectroscopy (XRF), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy with detector x-ray energy dispersive (SEM-EDX), thermal analysis (TG-DTG-DTA) and nitrogen adsorption methods. Micropore volume, micropore area, and specific surface …

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High-Efficiency Removal Of Cationic Dye And Heavy Metal Ions From Aqueous Solution Using Amino-Functionalized Graphene Oxide, Adsorption Isotherms, Kinetics Studies, And Mechanism, Meti̇n Çelebi̇, Eda Gökirmak Söğüt Jan 2022

High-Efficiency Removal Of Cationic Dye And Heavy Metal Ions From Aqueous Solution Using Amino-Functionalized Graphene Oxide, Adsorption Isotherms, Kinetics Studies, And Mechanism, Meti̇n Çelebi̇, Eda Gökirmak Söğüt

Turkish Journal of Chemistry

GO-NH2 (amino functionalized graphene oxide) was synthesized by grafting (3-aminopropyl) triethoxysilane onto the surface GO (graphene oxide). The GO-NH2 with a higher surface area and many active sites was characterized and its effectiveness in removing Rhod B dye and Ni(II) ions from wastewater by adsorption was observed. The effects of pH, time, and strange ions on the adsorption efficiency were investigated. The equilibrium isotherm data confirmed that it fits the Langmuir and Freundlich isotherm models. GO and GO-NH2 exhibited high adsorption capacity (QM); 2500 (mg L-1) and 3333 (mg L-1) for …

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Single And Selective Transport Of Zr(Iv) Ions With Trioctyl Amine Dissolved In Kerosene Using A Multidropped Liquid Membrane Technique, Fatma Tezcan, Ramazan Donat Jan 2022

Single And Selective Transport Of Zr(Iv) Ions With Trioctyl Amine Dissolved In Kerosene Using A Multidropped Liquid Membrane Technique, Fatma Tezcan, Ramazan Donat

Turkish Journal of Chemistry

It is very important to develop a process for selectively extracting Zr(IV) ions from the solution medium to produce zirconium metal used in industry and nuclear reactors. In this study, the parameters affecting the extraction of Zr(IV) ions were investigated using a multidropped liquid membrane (MDLM) system. Trioctyl amine (TOA) dissolved in kerosene was used as a carrier ligand in the extraction of Zr(IV) ions by the MDLM technique. The effect of carrier concentration and stripping solution concentration, pH, and the temperature in the donor phase on the transport of Zr(IV) were investigated. The optimum condition for the transportation of …

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A Study Of Silicon And Germanium-Based Molecules In Terms Of Solar Cell Devices Performance, Emi̇ne Taniş Jan 2022

A Study Of Silicon And Germanium-Based Molecules In Terms Of Solar Cell Devices Performance, Emi̇ne Taniş

Turkish Journal of Chemistry

Photovoltaic energy sources are increasingly in demand due to the cost of petroleum fuels and concerns about carbon emissions. For this reason, it is important to determine the photovoltaic properties of the compounds that are thought to be suitable for these energy sources. Here, 1,1,2,3,4,5-Hexaphenyl-1H-silole (HPS) and 1,1,2,3,4,5-Hexaphenyl-1H-germole (HPG) compounds that are thought to have excellent photovoltaic properties, electronic and charge transport properties were investigated experimentally and theoretically. The total energies, absorption spectra, Fermi energy (Efl) and work function (φ), maximum open circuit voltage (VOC), reorganization energies (λe and λh), frontier molecular orbital …

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Parameter Effect Quantification For A Phase Change Material-Based Lithium-Ion Battery Thermal Management System, Uğur Morali Jan 2022

Parameter Effect Quantification For A Phase Change Material-Based Lithium-Ion Battery Thermal Management System, Uğur Morali

Turkish Journal of Chemistry

The influence of discharge rate, ambient temperature, and phase change material on the maximum temperature and the highest temperature difference was investigated. The maximum temperature of the battery was tested with and without phase change material under extreme discharge rates (4C and 5C) and ambient temperatures (310 K and 320 K). Results showed that a phase change material reduced the maximum temperature from 327.94 K to 306.45 K for a 14.6 Ah lithium-ion battery discharged at 5C-rate and 320 K. Quantitatively determined parameter effects revealed that the PCM parameter considerably had a remarkable influence on maximum temperature compared to discharge …

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The Investigation Of Parameters Affecting Ibrutinib Release From Chitosan/ Tripolyphosphate/Carbon Nanofiber Composite Microspheres, Canan Armutcu Jan 2022

The Investigation Of Parameters Affecting Ibrutinib Release From Chitosan/ Tripolyphosphate/Carbon Nanofiber Composite Microspheres, Canan Armutcu

Turkish Journal of Chemistry

This study described the performance of carbon nanofiber modified chitosan (CNF@CS) composite microspheres for the controlled release of the Ibrutinib (IBR) drug. The surface morphology, particle sizes, and functional group contents of the microspheres were characterized by attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR), scanning electron, and optical microscopy measurements. The obtained data demonstrated that the addition of CNF to the microsphere increased the encapsulation efficiency of the IBR while allowing the controlled and gradual release of the drug. In terms of the encapsulation efficiency and drug release rate, IBR@CS/TPP/CNF microspheres, achieving drug encapsulation efficiency of 83.09%, have the most …

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L-(+)-Tryptophan Methyl Ester Derived Polymeric Microbeads As An Efficient Heterogeneous Catalyst For Green Synthesis Of 2-Amino-4-(Nitromethyl)-4h-Chromene-3- Carbonitriles, Ayşe Haliç Poslu, Bi̇lgen Osman, Yunus Kaya, Ömer Koz, Gamze Koz Jan 2022

L-(+)-Tryptophan Methyl Ester Derived Polymeric Microbeads As An Efficient Heterogeneous Catalyst For Green Synthesis Of 2-Amino-4-(Nitromethyl)-4h-Chromene-3- Carbonitriles, Ayşe Haliç Poslu, Bi̇lgen Osman, Yunus Kaya, Ömer Koz, Gamze Koz

Turkish Journal of Chemistry

The cross-linked microbeads with average diameter of 106-300 μm, [poly(EGDMA-MATrp)], were obtained by copolymerization reaction of N-methacryloyl-L-(+)-tryptophan methyl ester (MATrp) with ethylene glycol dimethacrylate (EGDMA) and successfully applied as a heterogeneous catalyst in conjugate addition reaction of nitromethane to substituted 2-iminochromenes in aqueous media. A variety of 2-amino-4-(nitromethyl)-4H-chromene-3-carbonitriles has been synthesized in good yields. Polymeric microbeads were very durable and reused 5 times without a significant loss of activity. DFT calculations and experimental results revealed the significant role of π-π interactions as well as hydrogen bonding in the reaction mechanism.

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Cyclotide-Rich Fractions Containing Nanofibers By Electrospinning: Preparation, Characterization And Examination Of Antimicrobial Activity, Eli̇f Büşra Baş, Cemi̇l Kürekci̇, Orhan Murat Kalfa, Muharrem Akcan Jan 2022

Cyclotide-Rich Fractions Containing Nanofibers By Electrospinning: Preparation, Characterization And Examination Of Antimicrobial Activity, Eli̇f Büşra Baş, Cemi̇l Kürekci̇, Orhan Murat Kalfa, Muharrem Akcan

Turkish Journal of Chemistry

In this study, antimicrobial nanofibers were produced with the mixtures of polyvinyl alcohol (PVA) and cyclotide-rich fractions by electrospinning method. After extraction, the first separation was carried out with C18 flash chromatography and then fractioned into five separate parts by reversed-phase high-pressure liquid chromatography (RP-HPLC). The molecular weights of cyclotides in each fraction were determined by quadrupole time-of-flight liquid chromatography-mass spectrometry (Q-TOF LC-MS). Cyclotide-rich fractions were mixed with 10% of PVA solution and nanofibers were produced from this biocomposite mixture by electrospinning method. The nanofibers were characterized by field emission scanning electron microscopy (FE-SEM), and it was observed that 100% …

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Study Of Silanized Nanostructures With Immobilized Fumarase For Production Of L-Malate, Nevra Öztürk Atay, Kevser Kuşat, Si̇nan Akgöl Jan 2022

Study Of Silanized Nanostructures With Immobilized Fumarase For Production Of L-Malate, Nevra Öztürk Atay, Kevser Kuşat, Si̇nan Akgöl

Turkish Journal of Chemistry

The conversion of fumaric acid into L-malate by fumarase immobilized on silanized nanostructures was analyzed experimentally. The enzyme was bound to the silanized nanostructures. We carried out scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR) analysis, zeta size analysis and surface area calculation for the characterization of the nanostructures. The effect of initial enzyme concentration and pH on immobilization procedure were investigated and the change of Michaelis-Menten constants (Km and Vmax) with immobilization was examined. The change in the storage stability of the enzyme by immobilization was also investigated. The stability of the immobilized enzyme was …

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Moo3, Tio2, And Motio5 Based Oxide Semiconductor For Photovoltaic Applications, Fatma Bayrakçeken Jan 2022

Moo3, Tio2, And Motio5 Based Oxide Semiconductor For Photovoltaic Applications, Fatma Bayrakçeken

Turkish Journal of Chemistry

Topographic essential synthesis of nanomaterials by adjusting easy preparatory factors is an effective way to improve a variety of nanostructured materials. The SILAR technique is used to evaluate the manufacturing samples of MoO3, TiO2, and MoTiO5 nanostructures. These nanostructures of MoO3, TiO2, and MoTiO5 are used as electrode materials in photovoltaic systems. The link between photoelectrochemical characteristics and MoO3, TiO2, and MoTiO5 nanostructures is studied in depth. The photoelectrochemical characteristics of MoO3, TiO2, and MoTiO5 nanostructures are discovered to be …

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Synthesis And Characterization Of A Series Of Conducting Polymers Based On Indole And Carbazole, Mehmet Ergi̇ner, Belkis Ustamehmetoğlu, Esma Sezer Jan 2022

Synthesis And Characterization Of A Series Of Conducting Polymers Based On Indole And Carbazole, Mehmet Ergi̇ner, Belkis Ustamehmetoğlu, Esma Sezer

Turkish Journal of Chemistry

A series of indole (In) and carbazole (Cz) derivative monomers have been synthesized, such as 4-[3-carbazolyl] indole (4In-3Cz), 5-[3-carbazolyl] indole (5In-3Cz), 6-[3-carbazolyl] indole (6In-3Cz), 7-[3-carbazolyl] indole (7In-3Cz). The comonomers synthesized by Stille coupling reaction were characterized by 1H-NMR and elemental analysis. Potentiodynamic method was used for electropolymerization of comonomers, Indole, Cz, and the mixture of In and Cz. Electrochemical activities of resulting P[4In-3Cz], P[5In-3Cz], P[6In-3Cz], P[7In-3Cz], polyindole (PIn), polycarbazole (PCz) and P[In-co-Cz] films were investigated comparatively by CV at different scan rates, electrochemical impedance spectroscopy (EIS) and spectroelectrochemical measurements. The ionization potentials, Ip, specific capacitance, Csp, and optical band gap, …

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Ytterbium Oxide Nanofibers: Fabrication And Characterization For Energy Applications, Adem Sarilmaz Jan 2022

Ytterbium Oxide Nanofibers: Fabrication And Characterization For Energy Applications, Adem Sarilmaz

Turkish Journal of Chemistry

Metal oxide nanomaterials are widely used in many applications of renewable energy. Ytterbium oxide (Yb2O3) also attracts attention due to its similar structure to ZnO (~3,26 eV) and TiO2 (~3,36 eV) in terms of bandgap energy. In this study, Yb2O3 belonging to the lanthanide oxide family was produced as nanofiber forms by using the electrospinning technique, which allows for large-scale production, for the first time. The morphological, structural, optical, and phase properties of the produced nanofibers were investigated via XRD, SEM-Mapping, TEM, FTIR, UV-Vis, and XPS characterization techniques. As a result of …

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The Effect Of A Phosphorus-Based Fr On The Fire Performance And Flammability Properties Of Basalt Fiber-Reinforced Acrylonitrile-Butadiene-Styrene Composites, Çağrialp Arslan, Mehmet Doğan Jan 2022

The Effect Of A Phosphorus-Based Fr On The Fire Performance And Flammability Properties Of Basalt Fiber-Reinforced Acrylonitrile-Butadiene-Styrene Composites, Çağrialp Arslan, Mehmet Doğan

Turkish Journal of Chemistry

This study focuses on the improvement in fire performance, and flame retardancy (FR) properties of chopped basalt fiberreinforced acrylonitrile-butadiene-styrene (ABS) composites. For this purpose, different amounts of aluminum diethyl phosphinate (AlPi) compound (5, 10, and 15 wt%) were incorporated in the composites. The FR properties of the composites were examined via limiting oxygen index (LOI), UL-94 standard, and mass loss calorimeter tests. Thermogravimetric analysis was carried out to analyze the decomposition behavior of the composites. SEM inspection was also performed to examine the char surfaces of the composites. The results and findings showed that the introduction of AlPi compound into …

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Application Of Srfeo3 Perovskite As Electrode Material For Supercapacitor And Investigation Of Co-Doping Effect On The B-Site, Mohammad Ahangari, Elham Mahmoodi, Nagi̇han Deli̇baş, Jafar Mostafaei, Elnaz Asghari, Aligholi Niaei Jan 2022

Application Of Srfeo3 Perovskite As Electrode Material For Supercapacitor And Investigation Of Co-Doping Effect On The B-Site, Mohammad Ahangari, Elham Mahmoodi, Nagi̇han Deli̇baş, Jafar Mostafaei, Elnaz Asghari, Aligholi Niaei

Turkish Journal of Chemistry

Energy storage by supercapacitors with short charging time and high power density is one of the types of electrochemical storage systems. Perovskite oxides have been significantly investigated as promising materials for energy storage in electrochemical systems. In this study, three perovskites, SrFeO3, SrCoO3, and SrCo0.5Fe0.5O3, were prepared using the sol-gel method and used as supercapacitor electrode materials. In fact, in this research, two consecutive elements (Fe, Co) from the periodic table that differ by one unit in atomic number are placed in the perovskite structure to study their electrochemical properties …

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Amin-Modified Graphene Oxide As A Promising Adsorbent For Selective Extraction Of Dexamethasone Adulterant From Herbal Supplements, Mahboob Nemati, Ali Zayer, Samin Hamidi Jan 2022

Amin-Modified Graphene Oxide As A Promising Adsorbent For Selective Extraction Of Dexamethasone Adulterant From Herbal Supplements, Mahboob Nemati, Ali Zayer, Samin Hamidi

Turkish Journal of Chemistry

In most cases, herbal supplements found in illegal centers and herbal medicine stores have harmful content that causes irreparable damage to people. As a representative of the green chemistry method, a rapid and efficient dispersive micro solid-phase extraction (D-mSPE) method was applied to extract dexamethasone adulterant from handmade supplements sold as power natural enhancing materials. The quantification of the analyte was performed by high performance liquid chromatography with an ultraviolet detector. Effective parameters on the extraction recovery, including the type and amount of adsorbent, the kind of elution solvent, and the time of extraction and elution, were systematically investigated. The …

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Assessment Of Environmental Pollutants At Trace Levels Using Ionic Liquids-Based Liquid-Phase Microextraction, Furkan Uzcan, Muhammad Saqaf Jagirani, Mustafa Soylak Jan 2022

Assessment Of Environmental Pollutants At Trace Levels Using Ionic Liquids-Based Liquid-Phase Microextraction, Furkan Uzcan, Muhammad Saqaf Jagirani, Mustafa Soylak

Turkish Journal of Chemistry

Sample preparation is the crucial and most challenging part of analytical chemistry for the speciation of environmental pollutants' traces. Along with the development of the sample preparation methods, the ionic liquid-based microextraction technique plays an important role. Due to the unequivocally unique "green" characteristic of ionic liquids (ILs), they owe their tunable properties, such as highly selective and high reaction efficiency, reusability, and good thermal stability, to present advancements in the sample preparation process. The ionic liquid-based microextraction techniques miniaturize the sample preparation process. Liquid phase microextraction intermediate solvents, desorption solvent extractants, and mediators have been used. They are quoting …

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Chemical Compositions And Biological Activities Of The Oils From The Genus Taxus And Factors Limiting The Regeneration Of Endangered Yews: A Review, Sagar Dhakal, Prem Kumar Khosla, Tokuma Getahun Jan 2022

Chemical Compositions And Biological Activities Of The Oils From The Genus Taxus And Factors Limiting The Regeneration Of Endangered Yews: A Review, Sagar Dhakal, Prem Kumar Khosla, Tokuma Getahun

Turkish Journal of Chemistry

The genus Taxus (yews) is the largest genus of the family Taxaceae. It comprises about 24 species with 55 varieties distributed mainly in Asia, Europe, North Africa, and North America. In addition to the taxane diterpenoids and the cancer drug taxol, its species contain many essential oils with actual or potential biological activity. This review covers the chemical constituents as well as biological activities of these oils that have been studied in fourteen countries over 46 years (1975-2021). It also discusses the biotic and abiotic factors that limit the regeneration of these economically and medicinally important plants.

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Silver Nanoparticles (Agnps) Based Selective Colorimetric Sensor For The Detection Of D-Arabinitol In A Urine Sample, Yuni Retnaningtyas, Siswandono Siswodihardjo, Ari Satia Nugraha Jan 2022

Silver Nanoparticles (Agnps) Based Selective Colorimetric Sensor For The Detection Of D-Arabinitol In A Urine Sample, Yuni Retnaningtyas, Siswandono Siswodihardjo, Ari Satia Nugraha

Turkish Journal of Chemistry

D-arabinitol is a sugar alcohol that is a typical metabolite of Candida species. The hydroxy group owned by D-arabinitol can function as a reducing agent that can reduce Ag+ to AgNPs. The resulting colloid is further stabilized by the addition of a capping agent. The capping agent used in this study was a combination of chitosan 1%(w/w) and PEG 6000 1% (w/w) (2:1) v/v. The formation of AgNPs causes an increase in the surface plasmon resonance spectra of the colloid solution at a wavelength of 430 nm with a slight blue shift. At the same time, the color of …

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Design, Synthesis, And Greener Pasture Biological Assessment Of A Novel Nucleoside: 1-(Α-D-Ribofuranosyl)-6,7-Difluoro-2-Methyl-4-Quinazolinone As An Inhibitor Of Covid-19 And Alzheimer's Disease, Laila M. Break, Adil A. Gobouri, Wafa S. Al-Harthi, Mohamed Hagar, Nadia S. Alkaff, Musa A. Said Jan 2022

Design, Synthesis, And Greener Pasture Biological Assessment Of A Novel Nucleoside: 1-(Α-D-Ribofuranosyl)-6,7-Difluoro-2-Methyl-4-Quinazolinone As An Inhibitor Of Covid-19 And Alzheimer's Disease, Laila M. Break, Adil A. Gobouri, Wafa S. Al-Harthi, Mohamed Hagar, Nadia S. Alkaff, Musa A. Said

Turkish Journal of Chemistry

Synthesis of a new fluorinated nucleoside of 6,7-difluoro-2-methyl-4-quinazolinone was described. 2-Amino-4,5-difluorobenzoic acid 1 reacts with (CH3CO)2O followed by ammonia to form (1H)-6,7-difluoro-2-methyl-4-quinazolinone 3a. Ribosylation of a silylated 4 with l-O-acety1-2,3-5-tri-O-benzoyl-α-D-ribofuranose 5 forms a protected nucleoside 6 then unprotected from 6 to give a free nucleoside 7. Greener pasture biological docking of the cystine protease of COVID-19 [Mpro, code 7BQY, PDB] by novel nucleoside and fluoroquinazoline compounds is presented. LIGPLOT (2D) representations calculated for the same ligands are shown. A superposition of remdesivir approved medicine, N3 inhibitor, and our ligands docked …

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Comparative Study And Dyeing Performance Of As-Synthesized Azo Heterocyclic Monomeric, Polymeric, And Commercial Disperse Dyes, Shehu Sa'ad Abdullahi, Haruna Musa, Shehu Habibu, Abdullahi Haruna Birniwa, Rania Edrees Adam Mohammad Jan 2022

Comparative Study And Dyeing Performance Of As-Synthesized Azo Heterocyclic Monomeric, Polymeric, And Commercial Disperse Dyes, Shehu Sa'ad Abdullahi, Haruna Musa, Shehu Habibu, Abdullahi Haruna Birniwa, Rania Edrees Adam Mohammad

Turkish Journal of Chemistry

In this study poly (4-nitrophenylazo-3-aminopyridine - formaldehyde) (PNAAP-F) and poly (4-nitroarylazo-3-chloro-6-hydroxypyridine - formaldehyde) (NAACHP-F) were synthesized via diazotization, coupling and polycondensation reactions. The structural properties of the as-synthesized dyes were acquired using Fourier-transform infrared spectroscopy (FTIR) and UV-visible absorption maxima and their color, yield, melting point, solubility, and viscosity were determined via standard methods. UV-visible and FTIR results show successful formation of the polymeric dyes due to shift of wavelength of maximum absorption (λmax) (440-490 nm, 480-540 nm) and new absorption peak at around (2780-2995 cm-1) for methylene bridge respectively. The dyes were found to be …

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A Molecularly Imprinted Polymer As Solid Phase Extraction Sorbent For Ketoprofen Determination In Water And Artificial Serum Prior To Hplc, Eli̇f Gürel Özyurt, Ömer Özyurt, Yekta Arya Ölçer Altinsoy, Ahmet Emi̇n Eroğlu, Ezel Boyaci, Talal Shahwan Jan 2022

A Molecularly Imprinted Polymer As Solid Phase Extraction Sorbent For Ketoprofen Determination In Water And Artificial Serum Prior To Hplc, Eli̇f Gürel Özyurt, Ömer Özyurt, Yekta Arya Ölçer Altinsoy, Ahmet Emi̇n Eroğlu, Ezel Boyaci, Talal Shahwan

Turkish Journal of Chemistry

Ketoprofen (KET) is an active pharmaceutical compound that has pain relieving and antipyretic effects. Its determination in body fluids and environmental waters is important due to widespread use of the compound. In this study, a selective and reliable method has been developed for the determination of ketoprofen in water and artificial serum using molecularly imprinted polymers (MIPs) as a solid phase extraction sorbent prior to HPLC-DAD detection. The MIP was synthesized by copolymerization of methacrylic acid (MAA) and trimethylpropane trimethacrylate (TRIM) in the presence of ketoprofen as the template. For the sake of comparison, nonimprinted polymer (NIP) was also synthesized …

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