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Articles 181 - 210 of 2628
Full-Text Articles in Physical Sciences and Mathematics
Quantifying Time-Dependent Structural And Mechanical Properties Of Uv-Aged Ldpe Power Cables Insulations, Abdallah Hedir, Ferhat Slimani, Mustapha Moudoud, Omar Lamrous, Tahar Touam, Madjid Teguar, Abderrahmane Haddad, Ali̇ Durmuş
Quantifying Time-Dependent Structural And Mechanical Properties Of Uv-Aged Ldpe Power Cables Insulations, Abdallah Hedir, Ferhat Slimani, Mustapha Moudoud, Omar Lamrous, Tahar Touam, Madjid Teguar, Abderrahmane Haddad, Ali̇ Durmuş
Turkish Journal of Chemistry
This paper reports effects of ultraviolet (UV) light radiation on the physicochemical, electrical and mechanical properties of low-density polyethylene (LDPE) cable insulating materials. Changes in structural and morphological properties of UV-aged samples were characterized by various analytical methods such as attenuated total reflection Fourier transform infrared spectroscopy (ATRFTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). Additionally, elongation at break, tensile strength, dielectric strength, and optical properties were also evaluated. Changes in some physical properties of LDPE after exposing to UV irradiation clearly highlighted that the polymer underwent the structural degradation. In addition, it was also …
Synthesis And Investigation Of A Hexyl Substituted Thieno-Fused Bodipy Derivative As A Versatile Near-Ir Fluorophore, Yusuf Çakmak
Synthesis And Investigation Of A Hexyl Substituted Thieno-Fused Bodipy Derivative As A Versatile Near-Ir Fluorophore, Yusuf Çakmak
Turkish Journal of Chemistry
The synthesis, photophysical and electrochemical properties of hexyl thiophene substituted thieno[b]-fused BODIPY structure are reported within this work. One such derivative, HTFBod, has been studied, which is one of the rare compounds that has a maximum absorbance wavelength greater than 750 nm among fused BODIPY compounds. In addition, it preserves its significant spectral properties such as high molar absorptivity and fluorescence quantum yield. Electrochemical characterizations indicated that the compound could be a successful candidate for an organic solar cell donor compound due to its low band gap, which is known to improve the short-circuit current (Jsc) values. The compound could …
Mil-53(Al) Catalytic Synthesis Of Poly(Ethylene Terephthalate), Ji Wang, Qingyin Wang, Gongying Wang
Mil-53(Al) Catalytic Synthesis Of Poly(Ethylene Terephthalate), Ji Wang, Qingyin Wang, Gongying Wang
Turkish Journal of Chemistry
Poly(ethylene terephthalate) (PET) is one of the world's five major engineering plastics and is widely used in various fields. At present, the main catalysts used in the synthesis of PET are antimony, titanium, and aluminum metal compounds. Among them, antimony-based catalysts are poisonous and the titanium-based catalyst products are relatively yellow in hue. The aluminum-based catalyst has the advantages of low price and environmental friendliness, but current research shows that the organoaluminum catalyst has the problem of hydrolysis, and MIL-53 (Al) has good stability and will not affect the environment, so we add a catalyst before the esterification reaction, and …
A Facile Synthesis Of Ag2Mnsns4 Nanorods Through Colloidal Method, Sultan Süleyman Özel, Serdar Akay, Faruk Özel
A Facile Synthesis Of Ag2Mnsns4 Nanorods Through Colloidal Method, Sultan Süleyman Özel, Serdar Akay, Faruk Özel
Turkish Journal of Chemistry
The production methods of semiconductor nanomaterials with new shapes and different compositions form the basis for the creation of high-performance structures in numerous applications. Kesterite structured materials are among these inorganic semiconductors and are suggested to be promising energy materials for the future. In this study, quaternary Ag2MnSnS4 nanocrystalline rods have been successfully synthesized for the first time by the colloidal hot-injection synthesis route and well-organized rod-like nanocrystals (NCs) with lengths ranging from 200 to 350 nm and widths from 10 to 30 nm were obtained. For this structure, the Ag2MnSnS4 exhibits a semiconductor …
Catalytic Pyrolysis Of Olive Oil Residue To Produce Synthesis Gas: The Effect Of Bulk And Nano Metal Oxides, Ebru Karadağ, Selva Bi̇lge, Yusuf Osman Donar, Ali̇ Sinağ
Catalytic Pyrolysis Of Olive Oil Residue To Produce Synthesis Gas: The Effect Of Bulk And Nano Metal Oxides, Ebru Karadağ, Selva Bi̇lge, Yusuf Osman Donar, Ali̇ Sinağ
Turkish Journal of Chemistry
In this study, olive oil residue (OR) biomass was pyrolyzed in the presence of bulk MgO (B-MgO), nano-MgO (N-MgO), bulk ZnO (B-ZnO)), and nano-ZnO (N- ZnO) metal oxides at different temperatures (400, 600, and 800 ºC). Significant results were obtained in terms of synthesis gas formation and CO2 reduction. The efficiency distribution of the products obtained as a result of the metal oxide-based pyrolysis process and the effects of metal oxides were examined in detail. Nanometal oxides were synthesized by the hydrothermal method. Characterization of metal oxides was carried out by Brunauer?Emmett?Teller (BET), x-ray powder diffraction (XRD) analysis and scanning-electron …
The Study On Biological Activities Of Silver Nanoparticles Produced Via Green Synthesis Method Using Salvia Officinalis And Thymus Vulgaris, Ömer Ödemi̇ş, Sadi̇n Özdemi̇r, Serpi̇l Gonca, Ali̇ Arslantaş, Mehmet Sali̇h Ağirtaş
The Study On Biological Activities Of Silver Nanoparticles Produced Via Green Synthesis Method Using Salvia Officinalis And Thymus Vulgaris, Ömer Ödemi̇ş, Sadi̇n Özdemi̇r, Serpi̇l Gonca, Ali̇ Arslantaş, Mehmet Sali̇h Ağirtaş
Turkish Journal of Chemistry
In the present study, Ag nanoparticles (AgNPs) were synthesized from Salvia officinalis and Thymus vulgaris, known as phytotherapy plants. The obtained silver nanoparticles were characterized using SEM, XRD, FTIR, and UV/Vis spectra. The antioxidant capacities of Salvia officinalis-mediated AgNP (SO-AgNP) and Thymus vulgaris-mediated AgNP (TV-AgNP) were analyzed in vitro using 1,1-diphenyl-2-picrylhydrazyl and iron chelating activity assays. DPPH activities were 83.74% and 57.17% for SO-AgNP and TV-AgNP at concentration 200 mg/L, respectively. Both green synthesized AgNPs exhibited good iron chelating activity. In addition, the DNA cleavage activities of SO-AgNPs and TV-AgNP were investigated with agarose gel electrophoresis technique. …
Major Chemical Constituents From Illicium Griffithii Hook. F. & Thoms Of North East India And Their Cytotoxicity And Antimicrobial Activities, Deepjyoti Dutta, Bardwi Narzary, Snigdha Saikia, Kashyap J. Tamuli, Manobjyoti Bordoloi, Neipihoi Lhouvum, Shyamalendu Nath, Ranjan K. Sahoo, Barnali Gogoi, Surovi Saikia, Nayan K. Bhattacharyya
Major Chemical Constituents From Illicium Griffithii Hook. F. & Thoms Of North East India And Their Cytotoxicity And Antimicrobial Activities, Deepjyoti Dutta, Bardwi Narzary, Snigdha Saikia, Kashyap J. Tamuli, Manobjyoti Bordoloi, Neipihoi Lhouvum, Shyamalendu Nath, Ranjan K. Sahoo, Barnali Gogoi, Surovi Saikia, Nayan K. Bhattacharyya
Turkish Journal of Chemistry
Illicium griffithii Hook. f. & Thoms is an endemic medicinal plant of North East India found in the Eastern Himalayan region of biodiversity mega centre. Herein, chemical investigation of I. griffithii, afforded five compounds and their structures were determined through extensive use of NMR, HRMS, and FT-IR spectroscopy. The complete proton-proton, proton-carbon coupling network of compound 1 was determined using 1H-1H COSY, HSQC and NOESY NMR experiments. All the compounds were evaluated for their cytotoxic activity by MTT assay and antimicrobial activity by Agar well diffusion method. Compound 1 exhibited significant cytotoxicity activity against Lung cancer (A549) and pancreatic …
A New Electrochromic Copolymer Composed Of 4,7-Di(Thiophen-2-Yl)Benzo[C] [1,2,5] Thiadiazole And 3,4-Ethylenedioxythiophene, Kübra Çeli̇k, Ari̇f Kivrak, Buket Çarbaş
A New Electrochromic Copolymer Composed Of 4,7-Di(Thiophen-2-Yl)Benzo[C] [1,2,5] Thiadiazole And 3,4-Ethylenedioxythiophene, Kübra Çeli̇k, Ari̇f Kivrak, Buket Çarbaş
Turkish Journal of Chemistry
A new electrochromic copolymer based on 4,7-di(thiophen-2-yl)benzo[c] [1,2,5]thiadiazole and 3,4-ethylenedioxythiophene was successfully obtained via the electrochemical polymerization method in the medium of electrolyte solution, which consists of 0.1 M tetrabutylammonium hexafluorophosphate and dichloromethane. In order to compare the electrochemical and chemical properties of the copolymer, the benzothiodiazole derivative and 3,4-ethylenedioxythiophene (EDOT) monomers, which are parts of the copolymer, are electrochemically polymerized, separately in the same environment and concentration with the copolymer. Poly(4,7-di(thiophen- 2-yl)benzo[c][1,2,5]thiadiazole) (P(TBT)) and poly(3,4-ethylenedioxythiophene) (PEDOT) polymers were obtained. Before starting the electrochemical synthesis, the initial oxidation potentials of the monomers that form the copolymer were compared via the …
Release Of Nifedipine, Furosemide, And Niclosamide Drugs From The Biocompatible Poly(Hema) Hydrogel Structures, Bahar Yilmaz
Release Of Nifedipine, Furosemide, And Niclosamide Drugs From The Biocompatible Poly(Hema) Hydrogel Structures, Bahar Yilmaz
Turkish Journal of Chemistry
The primary aim of this article was to improve the solubility and bioavailability of the drugs nifedipine, niclosamide, and furosemide due to their poor solubility and dissolution rate. Therefore, these drugs require improvement in solubility and dissolution rate in formulation development, especially in solid dosage forms such as hydrogels and capsules. Hydrogel structures were synthesized by using a biocompatible, nontoxic, and protective pure 2-hydroxy ethyl methacrylate (HEMA) monomer. These hydrogel structures were characterized by various techniques such as scanning electron microscopy and Fourier-transformed infrared spectroscopy. In the next step, drug molecules were loaded in the poly (HEMA) hydrogels. Drug releases …
Insight Into Electrochemical Degradation Of Cartap (In Padan 95sp) By Boron-Doped Diamond Electrode: Kinetic And Effect Of Water Matrices, Hoang Nguyen
Turkish Journal of Chemistry
In this work, the kinetic electrochemical degradation of Cartap (CT) (in Padan 95 SP) at boron-doped diamond (BDD) electrode was investigated. This study indicated that the degradation of CT underwent both direct and indirect oxidations. Water matrices can either accelerate or inhibit the removal efficiency of CT: adding 15 mM Cl- improved kCT from 0.039 min-1 to 0.054 min-1 (increased by 38%), while kCT decreased by 61.5% and 64% when increasing the concentration of HCO3- and humic acid (HA) to 15 mM and 15 mg L-1, respectively. CT degradation was inhibited …
Virus Detection Using Bio-Based Analysis Systems: A Review Of Biorecognition Strategies, Nur Meli̇s Kiliç, Di̇lek Odaci Demi̇rkol
Virus Detection Using Bio-Based Analysis Systems: A Review Of Biorecognition Strategies, Nur Meli̇s Kiliç, Di̇lek Odaci Demi̇rkol
Turkish Journal of Chemistry
Infectious illnesses are on the rise in today's world, with serious consequences for animals, plants, and humans. Several infections, including the human immunodeficiency virus, affect a large number of individuals in various countries, particularly in the poorer portions of contemporary society, and continue to cause a variety of health problems. Viruses are tiny parasitic organisms. They are infectious agents that can only reproduce within a live cell of an organism. Viruses may infect any living organism. For clinical pointof- care applications, early detections for harmful agents such as bacteria, viruses are critical. The possibility of worldwide epidemics as a result …
Photocatalytic Degradation Of Paracetamol By Semiconductor Oxides Under Uv And Sunlight Illumination, Derman Akşi̇t, Güli̇n Selda Pozan Soylu
Photocatalytic Degradation Of Paracetamol By Semiconductor Oxides Under Uv And Sunlight Illumination, Derman Akşi̇t, Güli̇n Selda Pozan Soylu
Turkish Journal of Chemistry
In this study, photocatalytic degradation of paracetamol (acetaminophen), an analgesic and antipyretic drug, was investigated in using semiconductors under UV-B and sunlight irradiation. Semiconductor materials, Bi2O3, ZnO, TiO2, and ZrO2, were prepared using simple sol-gel, coprecipitation, and microwave synthesis methods. These photocatalyts were characterized by various spectroscopic and other techniques. As a result of the reactions, 25 ppm paracetamol with Bi2O3 and ZnO photocatalyst, total degradation was achieved with UV-B irradiation in 90 min. The results of photocatalytic activities showed that the highest degradation rate was obtained with the …
Synthesis, Characterization, And Antimicrobial Evaluation Of Polyvinylalcohol-Osthol Composite Films, Ishrat Gowsia, Feroz Mir, Javid Banday
Synthesis, Characterization, And Antimicrobial Evaluation Of Polyvinylalcohol-Osthol Composite Films, Ishrat Gowsia, Feroz Mir, Javid Banday
Turkish Journal of Chemistry
Although poly-vinyl alcohol (PVA) has certain mechanical drawbacks such as a weak barrier, it has widely been used in food packaging over the last many years. To increase the suitability of PVA (C2H4O)n and render it ideal for food packaging, a diversity of studies have already been carried out. In the below-mentioned script, we, for the first time, report the use of natural product osthol in making a new composite with PVA for enhancing thermal, physicochemical, and antimicrobial properties. The significant aim of the report is the insertion of osthol (C15H16O3 …
Kinetic, Isotherm, And Thermodynamic Studies For Adsorptive Removal Of Basic Violet 14 From Aqueous Solution, Yasemi̇n Tamer, Hale Berber
Kinetic, Isotherm, And Thermodynamic Studies For Adsorptive Removal Of Basic Violet 14 From Aqueous Solution, Yasemi̇n Tamer, Hale Berber
Turkish Journal of Chemistry
In this study, the performance of chitosan based semi-IPN nanocomposite hydrogels for the adsorptive removal of basic violet 14 (BV14) from aqueous solution has been explored. Batch adsorption studies were conducted to determine the effect of various parameters on BV14 adsorption, and optimum values were reported as pH of 8, the adsorbent dosage of 0.025 g, initial BV14 concentration of 5 mg L-1 and contact time of 90 min at a temperature of 25 °C. The semi-IPN hydrogel containing 0.5% by weight GO showed the improved adsorption capacity for BV14 compared to the neat hydrogel adsorbent, and the maximum …
Preparation Of Surface Plasmon Resonance-Based Nanosensor For Curcumin Detection, Şebnem Çikrik, Duygu Çi̇men, Ni̇lay Bereli̇ Deni̇zli̇, Adi̇l Deni̇zli̇
Preparation Of Surface Plasmon Resonance-Based Nanosensor For Curcumin Detection, Şebnem Çikrik, Duygu Çi̇men, Ni̇lay Bereli̇ Deni̇zli̇, Adi̇l Deni̇zli̇
Turkish Journal of Chemistry
In this study, the curcumin imprinted and the non-imprinted poly(2-hydroxyethyl methacrylate-N-methacryloyl-Ltryptophan) (poly(HEMA-MATrp)) nanoparticle based surface plasmon resonance (SPR) nanosensors were prepared for the detection of curcumin and characterized by zeta-size analysis, Fourier transform infrared spectroscopy, and scanning electron microscopy. After, the curcumin imprinted and the non-imprinted nanoparticles are attached on the surface of SPR chips. The curcumin imprinted and the non-imprinted SPR nanosensors are characterized by using atomic force microscope, ellipsometer, and contact angle measurements. Kinetic studies were carried out with curcumin aqueous solution at a concentration range of 0.01-150 mg/L using the curcumin imprinted and the non-imprinted SPR nanosensors. …
Solar Light Degradation Of Organic Dye Pollutants And Preparation Of Bis(Indolyl)Methanes Using Core-Shell Fe3o4@Sio2@Cuo Nanocomposite, Kaveh Parvanak Boroujen, Zeinab Tohidiyan, Mina Mirzaei
Solar Light Degradation Of Organic Dye Pollutants And Preparation Of Bis(Indolyl)Methanes Using Core-Shell Fe3o4@Sio2@Cuo Nanocomposite, Kaveh Parvanak Boroujen, Zeinab Tohidiyan, Mina Mirzaei
Turkish Journal of Chemistry
In this research, a new ferromagnetic-recoverable core-shell Fe3O4@SiO2@CuO nanocomposite of a certain size (20-25 nm) has been synthesized based on Cu(II) complex coated on Fe3O4@SiO2@CuO nanoparticles by facile and fast solid state microwave irradiation method. The photocatalytic activity of the nanocomposite was investigated for degradation of methylene blue (MB) and methyl orange (MO) dye pollutants in aqueous media under solar light irradiation. The nanocomposite could destroy these dyes with high efficiency in short time. With comparison of degradation percentages can be concluded that the nanocomposite shows better photocatalytic activity for MB dye (97% in 180 s). Kinetic study revealed higher …
Synthesis Of Modified Nanocomposite Material And Its Use On Removal Of Cesium Fromaqueous Media, Bi̇lal Çeti̇n, Mustafa Özcan, Bektaş Karakelle
Synthesis Of Modified Nanocomposite Material And Its Use On Removal Of Cesium Fromaqueous Media, Bi̇lal Çeti̇n, Mustafa Özcan, Bektaş Karakelle
Turkish Journal of Chemistry
A nanocomposite containing Fe3O4, chitosan (Ch), and hexacyanoferrate (HCF) was synthesized in the form of powder. The physicochemical properties of this nanocomposite are determined using different techniques including Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM). The existence of Cs (Cs) ions onto the surface of the nanocomposite was verified by dispersive X-ray spectroscopy (EDX). FTIR spectra confirmed that the nanocomposite was well coordinated. The batch technique was applied to evaluate the influences of initial pH value, temperature, contact time, shaking rate, initial Cs concentration, and competing cations on the efficiency of Cs …
Investigation Of Antibacterial And Photocatalytic Efficiency Of Green Zno Nanoparticles That Synthesized With Celosia Cristata Flower Extract, Mahmure Özgür, Özgür Duygulu, Melda Altikatoğlu Yapaöz
Investigation Of Antibacterial And Photocatalytic Efficiency Of Green Zno Nanoparticles That Synthesized With Celosia Cristata Flower Extract, Mahmure Özgür, Özgür Duygulu, Melda Altikatoğlu Yapaöz
Turkish Journal of Chemistry
Increasing interest in green chemistry has led scientists to an environmentally friendly nanoparticle synthesis approach that has many advantages, such as simple, affordable and versatility for a wide range of commercial production. In this study, green synthesis of zinc oxide nanoparticles (ZnO NPs), which is widely researched in the field of nanotechnology, was performed under different conditions (volume ratio of CC flower extract to Zn(CH3COO)2 solution, time, pH and temperature) using the aqueous extract of Amarant (Celosia cristata L., CC, cockscome) plant flowers. Produced ZnO NPs were characterized by UV-Vis absorption spectroscopy, Fourier transform infrared spectroscopy (FTIR), high-resolution transmission electron …
Virtual Screening, Drug-Likeness Analysis, And Molecular Docking Study Of Potentialsevere Acute Respiratory Syndrome Coronavirus 2 Main Protease Inhibitors, Nikola Nedeljkovic, Milos Nikolic, Ana Stankovic, Nevena Jeremic, Dusan Tomovic, Andriana Bukonjic, Gordana Radic, Marina Mijajlovic
Virtual Screening, Drug-Likeness Analysis, And Molecular Docking Study Of Potentialsevere Acute Respiratory Syndrome Coronavirus 2 Main Protease Inhibitors, Nikola Nedeljkovic, Milos Nikolic, Ana Stankovic, Nevena Jeremic, Dusan Tomovic, Andriana Bukonjic, Gordana Radic, Marina Mijajlovic
Turkish Journal of Chemistry
Due to the length of time required to develop specific antiviral agents, the World Health Organization adopted the strategy of repurposing existing medications to treat Coronavirus disease 2019 infection. Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) main protease is possible biological target for potential antiviral drugs. We selected various compounds from PubChem database based on the structure of main protease inhibitors in Protein Data Bank database. Ten compounds showed nontumorigenic and nonmutagenic potential and met Egan's and Lipinski's rules. Molecular docking analysis was performed using AutoDock Vina software. Based on number and type of key binding interactions, as well as …
Supramolecular Solvent-Based Microextraction For The Preconcentration Of Pb2+ Andcd2+ Prior To Spectrophotometric Detection, Huma Zafar, Faheem Shah, Rafaqat Ali Khan, Asad Muhammad Khan, Jan Nisar, Bushra Ismail
Supramolecular Solvent-Based Microextraction For The Preconcentration Of Pb2+ Andcd2+ Prior To Spectrophotometric Detection, Huma Zafar, Faheem Shah, Rafaqat Ali Khan, Asad Muhammad Khan, Jan Nisar, Bushra Ismail
Turkish Journal of Chemistry
Supramolecular solvent-based dispersive liquid-liquid microextraction technique has been developed as a preconcentration tool for the determination of trace level of Pb2+ and Cd2+. Dodecanol dispersed in tetrahydrofuran has been utilized as a supramolecular-solvent system for the extraction of analytes prior to their quantitative determination with graphite furnace atomic absorption spectrophotometer. Both Pb2+ and Cd2+, which were efficiently extracted by supramolecular solvent system, were complexed with dithizone followed by the addition of supramolecular solvent. The experimental variables that could possibly influence the extraction efficiency, i.e. pH value, temperature, sample volume, centrifugation time, rate of centrifugation, ionic strength, etc. were subjected to …
Selective Adsorption Of Acidic Gases From Ternary Mixture By Acetate- And Sulfonate-Based Ionic Liquids At Molecular Level, Sadi̇ye Veli̇oğlu
Selective Adsorption Of Acidic Gases From Ternary Mixture By Acetate- And Sulfonate-Based Ionic Liquids At Molecular Level, Sadi̇ye Veli̇oğlu
Turkish Journal of Chemistry
This paper attempts to elucidate the competitive adsorption mechanism of thin films of ionic liquids (ILs) on the surface of porous materials for acidic gases at a molecular level in order to design a proper material for the diminishment of gas emissions. Thin film 1-butyl-3-methylimidazalium ([BMIM]+) cation-based IL systems composed of four different anions such as [CH3CO2]- and [CF3CO2]- (acetate-based), and [CH3SO3]- and [CF3SO3]- (sulfonate-based) are created in contact with the gas phase containing ternary H2S/CO2/CH4:1/25/74 mixture. To define gas adsorption performance at gas?liquid interface and bulk liquid phase, classical molecular dynamics simulations are carried out. Adsorption of acidic gases …
First Determination Of Anticancer, Cytotoxic, And In Silico Adme Evaluation Of Secondarymetabolites Of Endemic Astragalus Leucothrix Freyn & Bornm, Ayşe Şahi̇n Yağlioğlu, Duygu Güneş Gürbüz, Melda Dölarslan, İbrahi̇m Demi̇rtaş
First Determination Of Anticancer, Cytotoxic, And In Silico Adme Evaluation Of Secondarymetabolites Of Endemic Astragalus Leucothrix Freyn & Bornm, Ayşe Şahi̇n Yağlioğlu, Duygu Güneş Gürbüz, Melda Dölarslan, İbrahi̇m Demi̇rtaş
Turkish Journal of Chemistry
Isolation and characterization of anticancer activity guided secondary metabolites of endemic Astragalus leucothrix Freyn& Bornm were aimed. Aerial parts of the plant were extracted by maceration method in the solvent system methanol-chloroform (1 : 1) at room temperature. The obtained crude extract was dissolved in purified water. Then, the extract was partitioned with n-hexane, chloroform, ethyl acetate, and n-butanol, respectively. Anticancer activity tests of all the fractions were performed against HeLa and C6 cancer cells. The chloroform fraction that has highest anticancer activity was subjected to chromatographic methods such as column chromatography and thin layer chromatography. Pentyl tetratetracontanoate (1), alfalone …
Recycled Human Hair-Derived Activated Carbon For Energy-Related Applications, Oğuzhan Kotan, Hati̇ce Bayrakçeken
Recycled Human Hair-Derived Activated Carbon For Energy-Related Applications, Oğuzhan Kotan, Hati̇ce Bayrakçeken
Turkish Journal of Chemistry
Activated carbon, having high surface area and porosity, is a carbonaceous material that comes from organic main sources. In this work, activated carbon materials were produced from human hair that belongs to people who can be classified into two age groups (0-18 or 18-40 years). Activated carbons were characterized by nitrogen adsorption/desorption isotherms (BET), X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Raman spectroscopy, scanning electron microscopy (SEM), and elemental analysis techniques. Capacitances of the synthesized materials were determined by using cyclic voltammetry (CV). Characterization results showed that the structural properties of activated carbon materials and capacitance values are changed …
Adsorption Isotherms, Kinetic And Thermodynamic Studies On Cadmium And Lead Ions From Water Solutions Using Amberlyst 15 Resin, Adalet Tunceli̇, Abdullah Ulaş, Orhan Acar, Ali̇ Rehber Türker
Adsorption Isotherms, Kinetic And Thermodynamic Studies On Cadmium And Lead Ions From Water Solutions Using Amberlyst 15 Resin, Adalet Tunceli̇, Abdullah Ulaş, Orhan Acar, Ali̇ Rehber Türker
Turkish Journal of Chemistry
Adsorption isotherms, kinetic and thermodynamic parameters for Cd(II) and Pb(II) ions in water solutions by using Amberlyst 15 resin were performed and evaluated by utilizing solid phase extraction method with the batch system at 298, 308, and 318 K. Flame atomic absorption spectrometry was utilized for absorbance measurements of Cd and Pb in solutions. The Langmuir, Freundlich, and Dubinin?Radushkevich isotherm models, respectively were implemented to equilibrium results obtained. Experimental and theoretical monolayer adsorption capacities of resin for adsorptions of Cd(II) and Pb(II) by the Langmuir isotherm model were approximately the same and they were 120 and 116 mg/g for Cd(II) …
Effects Of Hydrogen Peroxide, Temperature And Treatment Time On Degradation Propertiesof Polyethersulfone Ultrafiltration Membrane, Yasi̇n Özay, Erdal Yabalak, Nadi̇r Di̇zge
Effects Of Hydrogen Peroxide, Temperature And Treatment Time On Degradation Propertiesof Polyethersulfone Ultrafiltration Membrane, Yasi̇n Özay, Erdal Yabalak, Nadi̇r Di̇zge
Turkish Journal of Chemistry
Oxidative cleaning agents such as hydrogen peroxide (H2O2) and sodium hypochlorite (NaClO) used in water and wastewater treatment play an important role in the degradation and rapid aging of the polymeric membranes. In addition, when the temperature is above the maximum operating range of the membrane, it negatively affects the membrane performance. H2O2, which is also known as a green and environmentally friendly strong oxidant because of releasing only water as a by-product, can provide good cleaning efficiency under temperature, but its influence on membrane aging is not fully understood. In this study, the aging of polyethersulfone (PES) ultrafiltration (UF) …
Capillary Zone Electrophoresis As A Quality Assessment Tool Of Paracetamol And Phenylephrine Hydrochloride In Presence Of Paracetamol Impurities, Joliana Farid, Nadia Mostafa, Yasmin Fayez, Hebatallah Essam
Capillary Zone Electrophoresis As A Quality Assessment Tool Of Paracetamol And Phenylephrine Hydrochloride In Presence Of Paracetamol Impurities, Joliana Farid, Nadia Mostafa, Yasmin Fayez, Hebatallah Essam
Turkish Journal of Chemistry
The combination of paracetamol (PAR) and phenylephrine HCl (PHE) is a common pharmaceutical combination intended to manage symptoms of every day cold. Since paracetamol is susceptible to degradation or some manufacturing-related impurities, its stability should be monitored continuously. The developed method in this study for the determination of PAR and PHE in presence of PAR impurities is considered a quality assessment tool especially when PAR impurities can be quantitatively determined. A capillary zone electrophoresis (CZE) method was optimized and validated for simultaneous determination of PAR and PHE in presence of PAR impurities namely, p-Aminophenol (PAP), p-Nitrophenol (PNP), Acetanilide (ACT) and …
Investigation Of Biological Activities Of Plant Extract And Green Synthesis Silvernanoparticles Obtained From Gilaburu (Viburnum Opulus L.) Fruits, Bi̇rgütay Şahi̇n, Ali̇ Savaş Bülbül, İbrahi̇m Seyfetti̇n Çeli̇k, Nesri̇n Korkmaz, Ahmet Karadağ
Investigation Of Biological Activities Of Plant Extract And Green Synthesis Silvernanoparticles Obtained From Gilaburu (Viburnum Opulus L.) Fruits, Bi̇rgütay Şahi̇n, Ali̇ Savaş Bülbül, İbrahi̇m Seyfetti̇n Çeli̇k, Nesri̇n Korkmaz, Ahmet Karadağ
Turkish Journal of Chemistry
In this study, biological activities of silver nanoparticles (AgNP) synthesized by green synthesis method using the fruit extract of Gilaburu (Viburnum opulus L.) plant were investigated. The characterization of the synthesized AgNPs was performed by ultraviolet visible region spectroscopy (UV-Vis), Fourier transform - infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray diffraction (XRD) techniques. The crystal size was found to be 52.32 nm when the XRD data were calculated with the Debye- Scherrer's equation. The antimicrobial activities of extract and AgNPs were investigated by microdilution and disk diffusion methods. Antibiofilm activities were examined by the crystal violet technique. The …
Dft / Tddft Insights Into Excited State Intra-Molecular Hydrogen Atom Transfer Mechanism In Liqcoumarin: An Efp1 Study, Kandigowda Jagadeesha, Yelechakanahally Lingaraju Ramu, Mariyappa Ramegowda
Dft / Tddft Insights Into Excited State Intra-Molecular Hydrogen Atom Transfer Mechanism In Liqcoumarin: An Efp1 Study, Kandigowda Jagadeesha, Yelechakanahally Lingaraju Ramu, Mariyappa Ramegowda
Turkish Journal of Chemistry
The theoretical calculations were carried out on Liqcoumarin (LC) and its water complex LC+(H20)4-[LCH] at the ground (S0) / first excited states (S1) by employing density functional theory (DFT) / state specific time-dependent density functional theory (SS-TDDFT). In LC and LCH, there is an intra-molecular hydrogen bond between hydroxyl group and acetyl group along with four inter-molecular hydrogen bonds in the hydrated molecule. The computational studies of molecular structural parameters, electrostatic potential, NBO analysis, molecular orbital's, and UV-Vis spectra of both molecules under polar solvents were explored by B3LYP / 6-31G (d,p) / PCM / EFP1 method. The intra-molecular hydrogen …
Phytochemical Composition And Pharmacological Activities Of Teucrium Polium L. Collected From Eastern Turkey, Gi̇zem Gülsoy Toplan, Fati̇h Göger, Turgut Taşkin, Gülay Ecevi̇t Genç, Ayşe Ci̇vaş, Gökalp İşcan, Mi̇ne Kürkçüoğlu, Afi̇fe Mat, Kemal Hüsnü Can Başer
Phytochemical Composition And Pharmacological Activities Of Teucrium Polium L. Collected From Eastern Turkey, Gi̇zem Gülsoy Toplan, Fati̇h Göger, Turgut Taşkin, Gülay Ecevi̇t Genç, Ayşe Ci̇vaş, Gökalp İşcan, Mi̇ne Kürkçüoğlu, Afi̇fe Mat, Kemal Hüsnü Can Başer
Turkish Journal of Chemistry
Teucrium species that belong to the family Lamiaceae have been traditionally used for their medicinal properties. T. polium is one the most widespread members of the genus for its use in the treatment of several diseases. In this study, the essential oil and phenolic composition of the aerial parts from T. polium were assessed by GC-FID, GC/MS, and LC-MS/MS as well as for its total phenolic content. Several extracts such as n-hexane, chloroform, methanol, and infusion were prepared and their antimicrobial, antioxidant, and also acetylcholinesterase activities were studied. According to GC/MS results, β -caryophyllene (8.8%), t-cadinol (6.2%), (E)-nerolidol (5%), α …
Synthesis Of Benzoyl Hydrazones Having 4-Hydroxy-3,5-Dimethoxy Phenyl Ring, Theirbiological Activities, And Molecular Modeling Studies On Enzyme Inhibition Activities, Bedri̇ye Seda Kurşun Aktar, Yusuf Sicak, Gi̇zem Tatar, Emi̇ne Elçi̇n Emre
Synthesis Of Benzoyl Hydrazones Having 4-Hydroxy-3,5-Dimethoxy Phenyl Ring, Theirbiological Activities, And Molecular Modeling Studies On Enzyme Inhibition Activities, Bedri̇ye Seda Kurşun Aktar, Yusuf Sicak, Gi̇zem Tatar, Emi̇ne Elçi̇n Emre
Turkish Journal of Chemistry
Hydrazone compounds have high capacity in terms of antioxidant activity and enzyme inhibition activities such as anticholinesterase, tyrosinase, and urease. In this study, benzoyl hydrazones compounds (7a-7m) were synthesized starting from 3,5-dimethoxy-4-hydroxybenzaldehyde. Antioxidant activity of the synthesized compounds was evaluated. In the β-carotene-linoleic acid and ABTS cation radical scavenging activities, compounds 7j, 7e, and 7m stood out as the most active compounds, respectively. In the anticholinesterase enzyme inhibition activity results, compound 7f exhibited the best activity against AChE and BChE enzymes in the synthesis series. In addition, molecular docking analysis was performed to understand the inhibition mechanism of the synthesized …