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Articles 1501 - 1530 of 10319
Full-Text Articles in Physical Sciences and Mathematics
The Role Of Some Metal Ions In Enhancement Of Photocatalytic Activity Of Fe$_{2}$O$_{3}$-V$_{2}$O$_{5}$Binary Oxide, Eda Sinirtaş İlkme, Güli̇n Selda Pozan Soylu
The Role Of Some Metal Ions In Enhancement Of Photocatalytic Activity Of Fe$_{2}$O$_{3}$-V$_{2}$O$_{5}$Binary Oxide, Eda Sinirtaş İlkme, Güli̇n Selda Pozan Soylu
Turkish Journal of Chemistry
Fe$_{2}$O$_{3}$-V$_{2}$O$_{5}$ mixed oxides were synthesized with solid-state dispersion (SSD) and coprecipitation methods. In addition, transition metal oxides such as CuO, NiO, and Co$_{3}$O$_{4}$ were successfully loaded on the synthesized catalyst (Fe$_{2}$O$_{3}$-V$_{2}$O$_{5}$) using the SSD method. The composite catalysts were inspected for their photocatalytic activities in degrading 2,4-dichlorophenol under UV light enforcement. The produced samples were analyzed using X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, diffuse reflectance spectroscopy, scanning electron microscopy, photoluminescence, and the Brunauer-Emmett- Teller method. The addition of transition metal oxides improved the photocatalytic activity of Fe$_{2}$O$_{3}$-V$_{2}$O$_{5}$5 (SSD). 1CuO wt% Fe$_{2}$O$_{3}$-V$_{2}$O$_{5}$ exhibited the highest percentage of 2,4-dichlorophenol …
Accelerated Fe$^{Iii}$/Fe$^{Ii}$ Redox Cycle Of Fenton Reaction System Using Pd/Nh$_{2}$-Mil-101(Cr)And Hydrogen, Zhong-Xing Liu, Xin Liu, Yong Li, Shi-Qian Gao
Accelerated Fe$^{Iii}$/Fe$^{Ii}$ Redox Cycle Of Fenton Reaction System Using Pd/Nh$_{2}$-Mil-101(Cr)And Hydrogen, Zhong-Xing Liu, Xin Liu, Yong Li, Shi-Qian Gao
Turkish Journal of Chemistry
In this paper, a novel improvement in the catalytic Fenton reaction system named MHACF-NH$_{2}$-MIL-101(Cr) was constructed based on H$_{2}$ and Pd/NH$_{2}$-MIL-101(Cr). The improved system would result in an accelerated reduction in Fe$^{III}$, and provide a continuous and fast degradation efficiency of the 10 mg L$^{-1}$ 4-chlorophenol which was the model contaminant by using only trace level Fe$^{II}$. The activity of Pd/NH$_{2}$-MIL-101(Cr) decreased from 100% to about 35% gradually during the six consecutive reaction cycles of 18 h. That could be attributed to the irreversible structural damage of NH$_{2}$-MIL-101(Cr). Key words:
Phytochemical Characterisation Of Phlomis Linearis Boiss. & Bal And Screening Foranticholinesterase, Antiamylase, Antimicrobial, And Cytotoxic Properties, Gamze Göger, Ümmühan Türkyolu, Ezgi̇ Nur Gürşen, Süleyman Yur, Abdullah Burak Karaduman, Fati̇h Göger, Mehmet Teki̇n, Gülmi̇ra Özek
Phytochemical Characterisation Of Phlomis Linearis Boiss. & Bal And Screening Foranticholinesterase, Antiamylase, Antimicrobial, And Cytotoxic Properties, Gamze Göger, Ümmühan Türkyolu, Ezgi̇ Nur Gürşen, Süleyman Yur, Abdullah Burak Karaduman, Fati̇h Göger, Mehmet Teki̇n, Gülmi̇ra Özek
Turkish Journal of Chemistry
In the present work, essential oil and fatty acids and extracts obtained from aerial parts of Phlomis linearis Boiss. & Bal. were investigated for chemical composition and biological activities. The phytochemical analyses were conducted with gas chromatographymass spectrometry/flame ionisation detector (GC-MS/FID) and liquid chromatography-mass spectromtetry (LC-MS/MS) techniques. The extracts and essential oil were studied for α-amylase and acetylcholinesterase activities with two different spectrophotometric methods. Antimicrobial activities of the extracts were investigated by microdilution. The extracts were evaluated in vitro for cytotoxic effects against cancer and normal cell lines by MTT assay. The essential oil (EO) contained α-pinene (12.5%) and β-caryophyllene …
Fabrication And Characterization Of Amidoxime-Functionalized Silica Decorated Withcopper: A Catalytic Assembly For Rapid Reduction Of Dyes, Ijaz Ahmed Khan, Muhammad Inaam-Ul-Hassan, Hazrat Hussain, Syed Mujtaba Shah, Tariq Yasin
Fabrication And Characterization Of Amidoxime-Functionalized Silica Decorated Withcopper: A Catalytic Assembly For Rapid Reduction Of Dyes, Ijaz Ahmed Khan, Muhammad Inaam-Ul-Hassan, Hazrat Hussain, Syed Mujtaba Shah, Tariq Yasin
Turkish Journal of Chemistry
In this study, amidoxime-functionalized silica decorated with copper (AFS-Cu) was fabricated and tested for its catalytic application. Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction were employed to characterize its structure and morphology. The application of AFS-Cu as a catalyst for the catalytic reduction of methylene blue (MB) in aqueous media using NaBH$_{4}$ as reductant was evaluated. The ability to reuse as well as the effect of catalyst dose and pH of solution on the catalytic activity was investigated. The reduction of MB followed pseudo-first-order kinetics and the rate constant (k) was 0.6224 min$^{-1}$. …
Dispersive Liquid-Liquid Microextraction For The Isolation And Hplc-Daddetermination Of Three Major Capsaicinoids In Capsicum Annuum L., Jude Caleb, Usama Alshana, Azmi̇ Hanoğlu, İhsan Çaliş
Dispersive Liquid-Liquid Microextraction For The Isolation And Hplc-Daddetermination Of Three Major Capsaicinoids In Capsicum Annuum L., Jude Caleb, Usama Alshana, Azmi̇ Hanoğlu, İhsan Çaliş
Turkish Journal of Chemistry
Dispersive liquid-liquid microextraction (DLLME) was combined with high-performance liquid chromatography-diodearray detector (HPLC-DAD) for the extraction and quantitation of three major capsaicinoids (i.e. capsaicin, dihydrocapsaicin and nordihydrocapsaicin) from pepper (Capsicum annuum L.). Chloroform (extraction solvent, 100 μL), acetonitrile (disperser solvent, 1250 μL) and 30 s extraction time were found optimum. The analytes were back-extracted into 300 μL of 50 mM sodium hydroxide/ methanol, 45/55% (v/v), within 15 s before being injected into the instrument. Enrichment factors ranged from 3.3 to 14.7 and limits of detection from 5.0 to 15.0 μg g$^{-1}$. Coefficients of determination (R$^{2}$) and %RSD were higher than 0.9962 …
Detection Of Alkanolamines In Liquid Cement Grinding Aids By Hplc Coupled Withevaporative Light Scattering Detector, Cheng Li, Wenfang Song, Yubai Shi, Zhiwei Qing
Detection Of Alkanolamines In Liquid Cement Grinding Aids By Hplc Coupled Withevaporative Light Scattering Detector, Cheng Li, Wenfang Song, Yubai Shi, Zhiwei Qing
Turkish Journal of Chemistry
Triethanolamine (TEA), triisopropanolamine (TIPA), diethanol isopropanolamine (DEIPA) are necessary cement additives, and knowing their contents is needed for quality control and also to understand final properties of the cement. Whether it is the production of grinding aids, technical research and development or application research all involve the detection of grinding aids. This work developed a simple analytical technique for the simultaneous analysis of these alkanolamines in liquid cement grinding aids using high-performance liquid chromatography (HPLC) combined with evaporative light scattering detection (ELSD). HPLC was conducted by an XBridge C18 column (with dimensions 4.6 × 250 mm and 5 ?m particles) …
Development Of A Spiramycin Sensor Based On Adsorptive Stripping Linear Sweepvoltammetry And Its Application For The Determination Of Spiramycin In Chicken Eggsamples, Mustafa Ci̇ttan
Turkish Journal of Chemistry
Herein, an adsorptive stripping linear sweep voltammetric technique was described to determine spiramycin, a macrolide antibiotic, using a carboxylic multiwalled glassy carbon electrode modified with carbon nanotubes. The main principle of the analytical methodology proposed was based on the preconcentration of spiramycin by open-circuit accumulation of the macrolide onto the modified electrode surface. As a result of the adsorption affinity of spiramycin to the modified surface, the sensitivity of the glassy carbon electrode was significantly increased for the determination of spiramycin. The electrochemical behavior of spiramycin was evaluated by cyclic voltammetry and the irreversible anodic peak observed was measured as …
Synthesis Of Some Nh- And Nh,S- Substituted 1,4-Quinones, Ayşeci̇k Kaçmaz
Synthesis Of Some Nh- And Nh,S- Substituted 1,4-Quinones, Ayşeci̇k Kaçmaz
Turkish Journal of Chemistry
A series of NH-substituted-1,4-quinones, possessing one, two, three or not chlorine, were synthesized by the reaction between different quinones (p-chloranil (1), p-toluquinone (2), or 2,3-dichloro-1,4-naphthoquinone (3)) and (-)-cis-myrtanylamine (5) via nucleophilic reactions. Moreover, 2-bromo-1,4-naphthoquinone (4) was reacted with 2-(methylthio)ethylamine (11) to produce aminosubstituted naphthoquinones (12 and 13), bearing with bromine and not bromine. In addition, 2-bromo-1,4-naphthoquinone (4) was reacted with 4?-aminodibenzo-18-crown-6 (14) and 4'-aminobenzo-18-crown-6 (16) to yield crown-containing 1,4-naphthoquinones (15 and 17), respectively. New compounds were characterized, providing 1H NMR, 13C NMR, FTIR, MS-ESI, UV/Vis and elemental analysis.
Rhenium/Rhenium Oxide Nanoparticles Production Using Femtosecond Pulsed Laserablation In Liquid, Abdullah Kepceoğlu, Yasemi̇n Gündoğdu, Adem Sarilmaz, Mustafa Ersöz, Faruk Özel, Hamdi̇ Şükür Kiliç
Rhenium/Rhenium Oxide Nanoparticles Production Using Femtosecond Pulsed Laserablation In Liquid, Abdullah Kepceoğlu, Yasemi̇n Gündoğdu, Adem Sarilmaz, Mustafa Ersöz, Faruk Özel, Hamdi̇ Şükür Kiliç
Turkish Journal of Chemistry
In this study, rhenium/rhenium oxide nanoparticles (Re / ReO$_{3}$ NPs) have been produced for the first time in ultrapure water by using Femtosecond Pulsed Laser Ablation in Liquid (fsPLAL) method. X-Ray Diffraction (XRD) measurements and results obtained for NPs show the existence of well-crystallized peaks and preferred phases. Re NPs have hexagonal structure while ReO$_{3}$ NPs have the perovskite-like cubic crystal structures. The Re / ReO$_{3}$ ratio is also determined to be 53 / 47 with ~ 20 nm crystallite size, while pure ReO$_{3}$ crystallite sizes were measured to be ~ 25 nm. The TEM results have shown that the …
Graphene Preparation And Graphite Exfoliation, Ahmed Moosa, Mayyadah Abed
Graphene Preparation And Graphite Exfoliation, Ahmed Moosa, Mayyadah Abed
Turkish Journal of Chemistry
The synthesis of Graphene is critical to achieving its functions in practical applications. Different methods have been used to synthesis graphene, but graphite exfoliation is considered the simplest way to produce graphene and graphene oxide. In general, con-trolling the synthesis conditions to achieving the optimum yield, keeping the pristine structure to realize on-demand properties, mini-mum layers with the smallest lateral size, and minimum oxygen content are the most obstacles experienced by researchers. Each applica¬tion requires a specific graphene model, graphene oxides GO, or even graphene intercalated compounds (GIC) depending on synthesis conditions and approach. This paper reviewed and summarized the …
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 …
Synthesis, Characterization And Catalytic Properties Of Cationic N-Heterocyclic Carbene Silver Complexes, Deni̇z Demi̇r Atli
Synthesis, Characterization And Catalytic Properties Of Cationic N-Heterocyclic Carbene Silver Complexes, Deni̇z Demi̇r Atli
Turkish Journal of Chemistry
Three new dibenzimidazolium salts bridged by 2-methylenepropane-1,3-diyl group were synthesized. Their dinuclear N-heterocyclic carbene Ag(I) complexes were prepared by the reactions of these salts with Ag2O. The structures of the synthesized compounds were defined by nuclear magnetic resonance (NMR), Fourier-transform infrared spectroscopy (FT-IR), elemental analysis, and LC-MSMS (for complexes) techniques. Stability of the silver complexes was confirmed by 1H NMR spectroscopy. Catalytic activities of Ag(I) compounds were tested for three-component coupling reaction of some aldehydes, amines, and phenylacetylene.
Synthesis And Characterization Of Biodegradable Palm Palmitic Acid Based Bioplastic, Abd Al-Wali Japir, Nadia Salih, Jumat Salimon
Synthesis And Characterization Of Biodegradable Palm Palmitic Acid Based Bioplastic, Abd Al-Wali Japir, Nadia Salih, Jumat Salimon
Turkish Journal of Chemistry
This study involves the quantitative analysis of high free fatty acid crude palm oil, the separation of palmitic acid and synthesis of palm palmitic acid-based bioplastic. Synthesis of dimethyl 2-tetradecylmalonate (DMTDM) using methyl palmitate (MP) with sodium hydride (NaH) in the presence of reactive solvent of dimethyl carbonate (DMC) was carried out. The reaction conditions comprise at a mole ratio of MP: DMC: NaH: dimethylformamide (DMF) (0.1:2:0.25:1) at 60 °C for 14 h with 88.3 ± 1.4% yield. FTIR spectra of DMTDM showed the ester carbonyl group at 1740 cm-1. The polymerization of DMTDM with 1,6-hexandiol or 1,12-dodecandiol was carried …
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, Characterization, And Biological Evaluation Of New Copper Complexes Ofnaphthyl Pyrazole Ligands, Melek Hinis, Kuldip Singh, Demet Erdönmez, Ayfer Menteş
Synthesis, Characterization, And Biological Evaluation Of New Copper Complexes Ofnaphthyl Pyrazole Ligands, Melek Hinis, Kuldip Singh, Demet Erdönmez, Ayfer Menteş
Turkish Journal of Chemistry
Two naphthalene pyrazole ligands were synthesized using KOH/DMSO and Cu catalyst and characterized with FT-IR, ESIMS, 1H, and 13C NMR spectroscopies. The crystal structures of 1-(2-methylnaphthalen-1-yl)-1H-pyrazole (MeNap-Pz) ligand have been determined with X-ray crystal structure analysis. Reaction of the ligands with Cu(NO3)2x3.5H2O gave two new complexes and characterized with magnetic susceptibility, molar conductance, FT-IR, LCMS-MS, ICP-OES, NMR, thermogravimetric analysis, and ESR spectra. The spectral data of the ligands are coordinated to the metal ion through the nitrogen atoms of the pyrazole ring. Consequently, it has been determined that [Cu(MeNap-Pz)2 (NO3)]NO3.2H2O complex showed square planar geometry and [Cu(NapMe-Pz)2(NO3)2].H2O complex showed octahedral …
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 …
Investigation Of Performances Of Commercial Diesel Oxidation Catalysts For Co, C3h6, And No Oxidation, Hande Güneş, Deni̇z Şanli Yildiz, Hüseyi̇n Barkin Özener, Gökhan Hi̇sar, Selmi̇ Eri̇m Bozbağ, Can Erkey
Investigation Of Performances Of Commercial Diesel Oxidation Catalysts For Co, C3h6, And No Oxidation, Hande Güneş, Deni̇z Şanli Yildiz, Hüseyi̇n Barkin Özener, Gökhan Hi̇sar, Selmi̇ Eri̇m Bozbağ, Can Erkey
Turkish Journal of Chemistry
Four commercial monolithic diesel oxidation catalysts (DOCs) with two different platinum group metal (PGM) loadings and Pt:Pd ratios of 1:0, 2:1, 3:1 (w/w) were investigated systematically for CO, C3H6, and NO oxidation, CO-C3H6 co-oxidation, and CO-C3H6-NO oxidation reactions via transient activity measurements in a simulated diesel engine exhaust environment. As PGM loading increased, light-off curves shifted to lower temperatures for individual and co-oxidation reactions of CO and C3H6. CO and C3H6 were observed to inhibit the oxidation of themselves and each other. Addition of Pd to Pt was found to enhance CO and C3H6 oxidation performance of the catalysts while …
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 …
Synthesis, Spectral Characterization, And Biological Studies Of 3,5-Disubstituted- 1,3,4-Oxadiazole-2(3h)-Thione Derivatives, Tuğçe Özyazici, Fi̇kretti̇n Şahi̇n, Meri̇ç Köksal Akkoç
Synthesis, Spectral Characterization, And Biological Studies Of 3,5-Disubstituted- 1,3,4-Oxadiazole-2(3h)-Thione Derivatives, Tuğçe Özyazici, Fi̇kretti̇n Şahi̇n, Meri̇ç Köksal Akkoç
Turkish Journal of Chemistry
The reaction of 3,4-dichlorophenyl-1,3,4-oxadiazole-2(3H)-thione with piperidine derivatives via Mannich reaction was used to generate eleven novel compounds in moderate to good yields. Synthesized molecules were characterized according to their structure with 1H NMR, 13C NMR and FT-IR spectral foundations, which were compatible with literature informations. Antimicrobial activity and cytotoxicity studies were done by disc diffusion and NCI-60 sulphordamine B assay methods. The antimicrobial test results revealed that synthesized compounds have better activity against gram-positive species than gram-negative ones. A total analysis of the antibacterial, antifungal, and antiyeast activity revealed that newly synthesized compounds were really active against Bacillus cereus, Bacillus …
The Synthesis And Characterization Of Polyorganosiloxane Nanoparticles From 3-Mercaptopropyltrimethoxysilane For Preparation Of Nanocomposite Films Via Photoinitiated Thiol-Ene Polymerization, Nurcan Karaca
Turkish Journal of Chemistry
This article describes the synthesis of modified silica nanoparticles (SiO2-MPTMS) via the condensation reaction carried out between silanol moieties of silica nanoparticles and the trialkoxy silyl groups of (3-mercaptopropyl) trimethoxysilane (MPTMS). Then, SiO2-MPTMS nanoparticles in certain amounts (0.5 wt %, 1 wt %, 2.5 wt % and 5 wt %) were incorporated into thiol-ene resins consisting of bisphenol A glycerolate dimethacrylate and trimethylolpropane tris(3-mercaptopropionate) to prepare nanocomposite films via the photoinitiated thiol-ene polymerization in presence of 2,2-Dimethoxy-2-phenylacetophenone 99% as a photoinitiator. Fourier transform infrared spectroscopy, dynamic light scattering, scanning transmission electron microscopy, thermal gravimetric analyzer, and X-ray photoelectron spectrometer were …
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 …
Novel Mannich Bases With Strong Carbonic Anhydrases And Acetylcholinesterase Inhibition Effects: 3-(Aminomethyl)-6-{3-[4-(Trifluoromethyl)Phenyl]Acryloyl}-2(3h)- Benzoxazolones, Si̇nan Bi̇lgi̇ner, Bariş Anil, Mehmet Koca, Yeli̇z Demi̇r, İlhami̇ Gülçi̇n
Novel Mannich Bases With Strong Carbonic Anhydrases And Acetylcholinesterase Inhibition Effects: 3-(Aminomethyl)-6-{3-[4-(Trifluoromethyl)Phenyl]Acryloyl}-2(3h)- Benzoxazolones, Si̇nan Bi̇lgi̇ner, Bariş Anil, Mehmet Koca, Yeli̇z Demi̇r, İlhami̇ Gülçi̇n
Turkish Journal of Chemistry
In this study, a new series of Mannich bases, 3-(aminomethyl)-6-{3-[4-(trifluoromethyl)phenyl]acryloyl}-2(3H)- benzoxazolones (1a-g), were synthesized by the Mannich reaction. Inhibitory effects of the newly synthesized compounds towards carbonic anhydrases (CAs) and acetylcholinesterase (AChE) enzymes were evaluated to find out new potential drug candidate compounds. According to the inhibitory activity results, Ki values of the compounds 1 and 1a-g were in the range of 12.3 ± 1.2 to 154.0 ± 9.3 nM against hCA I, and they were in the range of 8.6 ± 1.9 to 41.0 ± 5.5 nM against hCA II. Ki values of acetazolamide (AZA) that was used as …
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 …
Evaluation Of The Surface Properties Of 4-(Decyloxy) Benzoic Acid Liquid Crystal And Its Use In Structural Isomer Separation, Bi̇rol Işik, Fati̇h Çakar, Hüsnü Cankurtaran, Özlem Cankurtaran
Evaluation Of The Surface Properties Of 4-(Decyloxy) Benzoic Acid Liquid Crystal And Its Use In Structural Isomer Separation, Bi̇rol Işik, Fati̇h Çakar, Hüsnü Cankurtaran, Özlem Cankurtaran
Turkish Journal of Chemistry
The selectivity of 4-(Decyloxy) benzoic acid (DBA) liquid crystal in surface adsorption region (303.2-328.2 K) and thermodynamic region (423.2 - 433.2 K) was investigated by inverse gas chromatography at infinite dilution (IGC-ID). The selectivity parameters of the structural isomer series named butyl acetate, butyl alcohol, and amyl alcohol series were calculated for the DBA using IGC-ID technique. Additionally, the surface properties including dispersive surface energy (γ SD), free energy (ΔGAS), enthalpy (ΔHAS), and acidity-basicity constants were calculated with net retention volumes obtained from IGC-ID experiment results. When the ΔHAS and ΔGAS are constants, DBA surface was found to be an …
3-Hydroxy-7,8,9,10-Tetrahydro-6h-Benzo[C]Chromen-6-One And 3-Hydroxy-6h-Benzo[C] Chromen-6-One Act As On-Off Selective Fluorescent Sensors For Iron (Iii) Under In Vitro And Ex Vivo Conditions, Karar Shukur, Amirhossein Fallah, Kerem Terali, Rasi̇me Kalkan, Mustafa Gazi, Hayretti̇n Ozan Gülcan
3-Hydroxy-7,8,9,10-Tetrahydro-6h-Benzo[C]Chromen-6-One And 3-Hydroxy-6h-Benzo[C] Chromen-6-One Act As On-Off Selective Fluorescent Sensors For Iron (Iii) Under In Vitro And Ex Vivo Conditions, Karar Shukur, Amirhossein Fallah, Kerem Terali, Rasi̇me Kalkan, Mustafa Gazi, Hayretti̇n Ozan Gülcan
Turkish Journal of Chemistry
Regarding the abundant use of metals for different purposes, it becomes more critical from various scientific and technologi¬cal perspectives to discover novel agents as selective probes for the detection of specific metals. In our previous studies, we have shown that aqueous solutions of natural urolithins (i.e., hydroxyl-substituted benzo[c]chromen-6-one derivatives) are selective Iron (III) sen¬sors in fluorescence assays. In this study, we have extrapolated these findings to another coumarine compound (i.e., 3-Hydroxy-7,8,9,10- tetrahydro-6H-benzo[c]chromen-6-one) and compared the selective metal binding properties with Urolithin B (i.e., 3-Hydroxy-6H-benzo[c]chromen-6-one). Following the synthesis and structure identification studies, the fluorometric studies pointed out that the lactam group …
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 …