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Articles 1 - 30 of 167
Full-Text Articles in Chemistry
Study Of The Effectiveness Of A Presoaking Process For Reducing The Additives Migration From Babies Toys, Mohand Ouidir Boussoum, Aicha Kentaoui, Beatrice George, Stephane Dumarcay, Ahmed Boucherit, Hassiba Laribi Habchi
Study Of The Effectiveness Of A Presoaking Process For Reducing The Additives Migration From Babies Toys, Mohand Ouidir Boussoum, Aicha Kentaoui, Beatrice George, Stephane Dumarcay, Ahmed Boucherit, Hassiba Laribi Habchi
Turkish Journal of Chemistry
This research aims to study a process of steeping in the n-heptane, used for reducing the migration of additives contained initially in toys for babies plasticized with di-octylphtalate (DOP) based on poly (vinyl chloride) (PVC) and stabilized with epoxidized sunflower oil (ESO). Two formulations were carried out at different levels of DOP plasticizers (15% and 45%). The migration tests were conducted in the synthetic saliva in the absence and in the presence of α-amylase with or without agitation at 37° C for 1, 3, and 6 h. The migration phenomenon was studied on the basis of preliminary studies based on …
Synthesis Of Nonperipherally Tetra-[5-(Diethylamino)-2-Formylphenoxy] Substituted Metallophthalocyanines And Their Electrochemistry, Turgut Keleş, Di̇lek Ünlüer, Zekeri̇ya Biyiklioğlu, Yasemi̇n Ünver
Synthesis Of Nonperipherally Tetra-[5-(Diethylamino)-2-Formylphenoxy] Substituted Metallophthalocyanines And Their Electrochemistry, Turgut Keleş, Di̇lek Ünlüer, Zekeri̇ya Biyiklioğlu, Yasemi̇n Ünver
Turkish Journal of Chemistry
3-[5-(diethylamino)-2-formylphenoxy]phthalonitrile (n-TY-CN), metallophthalocyanines n-TY-Co, n-TY-Cu, and n-TY-Mn bearing [5-(diethylamino)-2-formylphenoxy] groups at nonperipheral positions were prepared for the first time. These compounds were characterized with IR, NMR (only for n-TY-CN), mass and UV-vis (except n-TY-CN) spectroscopy. Voltammetric characterizations of n-TY-Co, n-TY-Cu, and n-TY-Mn revealed that while n-TY-Co, n-TY-Cu, and n-TY-Mn showed characteristic Pc ring and/or metal-based reduction reaction, n-TY-Co, n-TY-Cu, and n-TY-Mn were coated on the working electrode during the oxidation processes owing to the cationic electropolymerizations of the [5-(diethylamino)-2-formylphenoxy] substituents.
Synthesis Of 7,12-Bis(4-(Di(1h-Pyrrol-2-Yl)Methyl)Phenyl)Benzo[K]Fluoranthene From Anew Dialdehyde As A Novel Fluorometric Bis-Dipyrromethane Derivative, Faride Ranjbari, Salar Hemmati, Mohammad Reza Rashidi
Synthesis Of 7,12-Bis(4-(Di(1h-Pyrrol-2-Yl)Methyl)Phenyl)Benzo[K]Fluoranthene From Anew Dialdehyde As A Novel Fluorometric Bis-Dipyrromethane Derivative, Faride Ranjbari, Salar Hemmati, Mohammad Reza Rashidi
Turkish Journal of Chemistry
Dipyrromethanes are useful mediator structures which can be used as a part of other molecules such as bis-porphyrins and their derivations. Various methods have been developed for their synthesis. This study presents the synthesis of a new bis- dipyrromethane, 7,12-bis(4-(di(1H-pyrrol-2-yl)methyl)phenyl)benzo[k]fluoranthene, using the Lewis acid catalyzed reaction between a new dialdehyde and pyrrole at room temperature. The UV spectroscopic and fluorometric properties of the final product and precursors were determined. The newly synthesized product with desirable UV spectroscopic and fluorometric properties has the potential to be applied as a part of bisporphyrins or it can be used for other purposes in …
In Situ Preparation Of Hetero-Polymers/Clay Nanocomposites By Cuaac Click Chemistry, Mehmet Ati̇lla Taşdelen, Çağatay Altinkök
In Situ Preparation Of Hetero-Polymers/Clay Nanocomposites By Cuaac Click Chemistry, Mehmet Ati̇lla Taşdelen, Çağatay Altinkök
Turkish Journal of Chemistry
A series of polymer/clay nanocomposites containing mechanistically two different polymers, poly(ethylene glycol) (PEG) and poly(epsilon caprolactone) (PCL), were prepared by simultaneous copper(I)-catalyzed alkyne-azide cycloaddition click reactions. Both clickable polymers, PEG-Alkyne and PCL-Alkyne, were simultaneously clicked on to azide-functional montmorillonite (MMT-N3) nanoclay to get corresponding PEG-PCL/MMT nanocomposites. The chemical structures of the resulting nanocomposites were verified by following azide and silicone-oxygen bands using FT-IR and characteristic bands of PEG and PCL segments using 1H-NMR spectroscopy. The combined XRD and TEM analysis confirmed that all PEG-PCL/MMT nanocomposites had partially exfoliated/ intercalated morphologies. In addition, the increase of MMT-N3 loading not only improved …
Synthesis And Characterization Of Novel 4-Benzyloxyphenyl 4-[4-(N-Dodecyloxy)Benzoyloxy]Benzoate Liquid Crystal, Emi̇ne Balkanli, Fati̇h Çakar, Hale Ocak, Özlem Cankurtaran, Belkiz Bi̇lgi̇n Eran
Synthesis And Characterization Of Novel 4-Benzyloxyphenyl 4-[4-(N-Dodecyloxy)Benzoyloxy]Benzoate Liquid Crystal, Emi̇ne Balkanli, Fati̇h Çakar, Hale Ocak, Özlem Cankurtaran, Belkiz Bi̇lgi̇n Eran
Turkish Journal of Chemistry
Liquid crystal (LC) compound 4-Benzyloxyphenyl 4-[4-(n-dodecyloxy)benzoyloxy]benzoate (BDBB) was prepared and characterized. Inverse gas chromatography (IGC) was to be a beneficial analysis method for the research of thermodynamic characteristics of the new LC. Acetate and alcohol isomers were used to examine LC selectivity via the IGC technique at temperatures between 333.2 K and 483.2 K. The retention diagrams of n-heptane, n-octane, n-nonane, n-decane, undecane, dodecane, tridecane, n-butyl acetate, isobutyl acetate, ethyl acetate, n-propylbenzene, isopropylbenzene, ethylbenzene, chlorobenzene, and toluene on BDBB were plotted with temperatures of 483.2?493.2 K. Flory?Huggins interaction parameter and weight fraction activity coefficient at infinite dilution were researched for …
Spectrophotometric Analysis Of Stability Of Gold Nanoparticles During Catalytic Reduction Of 4-Nitrophenol, Farhat Saira, Samia Saleemi, Humaira Razzaq, Rumana Qureshi
Spectrophotometric Analysis Of Stability Of Gold Nanoparticles During Catalytic Reduction Of 4-Nitrophenol, Farhat Saira, Samia Saleemi, Humaira Razzaq, Rumana Qureshi
Turkish Journal of Chemistry
Spectrophotometric monitoring of 4-nitrophenol (4-NP) reduction by sodium borohydride (NaBH4) using gold nanoparticles (GNPs) as a catalyst has been extensively studied, but the stability of GNPs in terms of change in the surface plasmon resonance (SPR) at different temperatures has not been explored. In the present investigation, our aim was to evaluate the SPR stability of GNPs as a catalyst during the reduction of 4-NP at different elevated temperatures (i.e. 30-60 °C) and sodium borohydride concentrations. Sensitivity of this degradation process toward concentration of GNPs at a range of temperatures is also evaluated. The spectrophotometric results reveal that up to …
Investigation Of Olea Ferruginea Roylebark Extracts For Potential In Vitroantidiabetic And Anticancer Effects, Samra Liaqat, Muhammad Islam, Hamid Saeed, Mehwish Iqtedar, Azra Mehmood
Investigation Of Olea Ferruginea Roylebark Extracts For Potential In Vitroantidiabetic And Anticancer Effects, Samra Liaqat, Muhammad Islam, Hamid Saeed, Mehwish Iqtedar, Azra Mehmood
Turkish Journal of Chemistry
This study was conducted to investigate the physicochemical, phytochemical, in vitro antidiabetic and anticancer potential of Olea ferruginea R bark. After extraction using Soxhlet, in vitro antidiabetic and cytotoxic activity on human hepatocellular carcinoma (HepG2) cells was assessed by nonenzymatic glycosylation of hemoglobin assay, alpha-amylase inhibition assay, glucose uptake by yeast cells, and 3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyl tetrazolium bromide assay, respectively, and gene expression via real-time polymerase chain reaction. Primary and secondary metabolites were present in the extractants; polyphenols (35.61 ± 0.03) and flavonoids (64.33 ± 0.35) in the chloroform; and polysaccharides in the ethanol (268.75 ± 0.34), and glycosaponins (78.01 ± …
Vortex-Assisted Magnetic Solid Phase Extraction Of Pb And Cu In Some Herb Samples On Magnetic Multiwalled Carbon Nanotubes, Di̇lek Kamaş, Aslihan Karatepe, Mustafa Soylak
Vortex-Assisted Magnetic Solid Phase Extraction Of Pb And Cu In Some Herb Samples On Magnetic Multiwalled Carbon Nanotubes, Di̇lek Kamaş, Aslihan Karatepe, Mustafa Soylak
Turkish Journal of Chemistry
This study is the development of a new solid phase extraction method based on using magnetic multiwalled carbon nanotubes impregnated with 1-(2-pyridylazo)2-naphthol (PAN) for separation, preconcentration, and flame atomic absorption spectrometric determination of Pb(II) and Cu(II). Optimization of the method was done by investigating pH effect, amount of magnetic multiwalled carbon nanotubes impregnated with PAN, eluent type and volume, matrix effects, and volume of the sample. The optimum adsorbent amount was found to be 75 mg and the optimum pH value was found as 5.5. The detection limits were 16.6 μg L-1 for Pb(II) and 18.9 μg L-1 for Cu(II). …
Co2 Hydrogenation To Methanol And Dimethyl Ether At Atmospheric Pressure Using Cu-Ho-Ga/Γ-Al2o3 And Cu-Ho-Ga/Zsm-5: Experimental Study And Thermodynamic Analysis, Cansu Tuygun, Bahar İpek
Co2 Hydrogenation To Methanol And Dimethyl Ether At Atmospheric Pressure Using Cu-Ho-Ga/Γ-Al2o3 And Cu-Ho-Ga/Zsm-5: Experimental Study And Thermodynamic Analysis, Cansu Tuygun, Bahar İpek
Turkish Journal of Chemistry
CO2 valorization through chemical reactions attracts significant attention due to the mitigation of greenhouse gas effects. This article covers the catalytic hydrogenation of CO2 to methanol and dimethyl ether using Cu-Ho-Ga containing ZSM-5 and γ-Al2O3 at atmospheric pressure and at temperatures of 210 °C and 260 °C using a CO2:H2 feed ratio of 1:3 and 1:9. In addition, the thermodynamic limitations of methanol and DME formation from CO2 was investigated at a temperature range of 100?400 °C. Cu-Ho-Ga/γ-Al2O3 catalyst shows the highest formation rate of methanol (90.3 μmolCH3OH/gcat/h ) and DME (13.2 μmolDME/gcat/h) as well as the highest selectivity towards …
Microwave Assisted, Sequential Two-Step, One-Pot Synthesis Of Novel Imidazo[1,2-A]Pyrimidine Containing Tri/Tetrasubstituted Imidazole Derivatives, Tuğba Güngör
Turkish Journal of Chemistry
A series of novel imidazo[1,2-a]pyrimidine containing tri/tetrasubstituted imidazole derivatives (1-10) has been synthesized via sequential two-step, one-pot, multicomponent reaction using imidazo[1,2-a]pyrimidine-2-carbaldehyde, benzil, primary amines, and ammonium acetate catalyzed by p-toluenesulfonic acid under microwave-assisted conditions. The results showed that target compounds can be obtained from a wide range of primary amines bearing different functional groups with moderate to good yields (46%-80%) under optimum reaction conditions. This method provides a green protocol for imidazo[1,2-a]pyrimidine containing tri/ tetrasubstituted imidazole derivatives due to ethyl alcohol as a green solvent, microwave irradiation as a greener heating method and one-pot multicomponent reaction as a green technique. …
Toxicity Remission Of Paes On Multireceptors After Molecular Modification Through A3d-Qsar Pharmacophore Model Coupled With A Gray Interconnect Degree Method, Xinyi Chen, Yu Li
Toxicity Remission Of Paes On Multireceptors After Molecular Modification Through A3d-Qsar Pharmacophore Model Coupled With A Gray Interconnect Degree Method, Xinyi Chen, Yu Li
Turkish Journal of Chemistry
In the proposed model, the gray interconnect degree method was employed to process the acute toxicity values of phthalate acid esters (PAEs) to green algae, daphnia, mysid, and fish (predicted by EPI Suite software) and to obtain the comprehensive characterization value of the multireceptor toxicity effect (MTE) of PAEs. The 3D-QSAR pharmacophore model indicated that hydrophobic groups significantly affected the MTE of PAEs. Based on this, 16 PAEs derivative molecules with significantly decreased comprehensive characterization value (more than 10%) of the toxic effects of multireceptors were designed. Among them, 13 PAEs derivative molecules reduced the toxicity values (predicted by the …
Enhanced Ethanol Sensing Properties Of Wo$_{3}$ Modified Tio$_{2}$ Nanorods, Bekzat Abdikadyr, Alp Kiliç, Onur Alev, Serkan Büyükköse, Zafer Zi̇ya Öztürk
Enhanced Ethanol Sensing Properties Of Wo$_{3}$ Modified Tio$_{2}$ Nanorods, Bekzat Abdikadyr, Alp Kiliç, Onur Alev, Serkan Büyükköse, Zafer Zi̇ya Öztürk
Turkish Journal of Chemistry
Pristine and WO$_{3}$ decorated TiO$_{2}$ nanorods (NRs) were synthesised to investigate n-n-type heterojunction gas sensing properties. TiO$_{2}$ NRs were fabricated via hydrothermal method on fluorine-doped tin oxide coated glass (FTO) substrates. Then, tungsten was sputtered on the TiO$_{2}$ NRs and thermally oxidised to obtain WO$_{3}$ nanoparticles. The heterostructure was characterised by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX) spectroscopy. Fabricated sensor devices were exposed to VOCs such as toluene, xylene, acetone and ethanol, and humidity at different operation temperatures. Experimental results demonstrated that the heterostructure has better sensor response toward ethanol at 200 °C. Enhanced sensing …
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) …
Preparation Of Glutathione Loaded Nanoemulsions And Testing Of Hepatoprotectiveactivity On Thle-2 Cells, Ozan Yeşi̇ltepe, Emi̇ne Güler Çeli̇k, Caner Geyi̇k, Zi̇nar Pinar Gümüş, Di̇lek Odaci Demi̇rkol, Hakan Coşkunol, Suna Ti̇mur
Preparation Of Glutathione Loaded Nanoemulsions And Testing Of Hepatoprotectiveactivity On Thle-2 Cells, Ozan Yeşi̇ltepe, Emi̇ne Güler Çeli̇k, Caner Geyi̇k, Zi̇nar Pinar Gümüş, Di̇lek Odaci Demi̇rkol, Hakan Coşkunol, Suna Ti̇mur
Turkish Journal of Chemistry
To improve bioavailability and stability of hydrophobic and hydrophilic compounds, nanoemulsions are good alternatives as delivery systems because of their nontoxic and nonirritant nature. Glutathione (GSH) suffers from low stability in water, where its encapsulation in nanoemulsions is a powerful strategy to its stability in aqueous systems. The aim of this study was to obtain nanoemulsions from the hydrophobic/hydrophilic contents of N. sativa seed oil so as to improve GSH stability along with bioavailability of N. sativa seed oil. Then, the prepared nanoemulsions were tested for in vitro hepatoprotective activity against ethanol toxicity. To the best of our knowledge, there …
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), …
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 …
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 …
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 …
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 …
Pan-Based Activated Carbon Nanofiber/Metal Oxide Composites For Co2 And Ch4adsorption: Influence Of Metal Oxide, Çi̇sem Kirbiyik Kurukavak, Burak Zafer Büyükbekar, Mustafa Ersöz
Pan-Based Activated Carbon Nanofiber/Metal Oxide Composites For Co2 And Ch4adsorption: Influence Of Metal Oxide, Çi̇sem Kirbiyik Kurukavak, Burak Zafer Büyükbekar, Mustafa Ersöz
Turkish Journal of Chemistry
In the present study, we successfully prepared two different electrospun polyacrylonitrile (PAN) based-activated carbon nanofiber (ACNF) composites by incorporation of well-distributed Fe2O3 and Co3O4 nanoparticles (NPs). The influence of metal oxide on the structural, morphological, and textural properties of final composites was thoroughly investigated. The results showed that the morphological and textural properties could be easily tuned by changing the metal oxide NPs. Even though, the ACNF composites were not chemically activated by any activation agent, they presented relatively high surface areas (SBET) calculated by Brunauer?Emmett? Teller (BET) equation as 212.21 and 185.12 m2/g for ACNF/Fe2O3 and ACNF/Co3O4 composites, respectively. …
Scalable Activated Carbon/Graphene Based Supercapacitors With Improved Capacitanceretention At High Current Densities, İffet Işil Gürten
Scalable Activated Carbon/Graphene Based Supercapacitors With Improved Capacitanceretention At High Current Densities, İffet Işil Gürten
Turkish Journal of Chemistry
Scalable, highly stable supercapacitor electrodes were developed from the mixture of a tea factory waste based activated carbon (AC) and a low-cost electrochemical exfoliated graphene (EEG). The hybrid electrodes showed notably enhanced stability at high current densities. The AC sample was prepared by chemical method and exposed to a further heat treatment to enhance electrochemical performance. Graphene used in the preparation of hybrid electrodes was obtained by direct electrochemical exfoliation of graphite in an aqueous solution. Detailed structural characterization of AC, EEG, and hybrid material was performed. The original electrochemical performances of AC and EEG were examined in button size …
Multiple Objective Optimization Of Air Assisted Liquid-Liquid Microextraction Combined With Solidified Floating Organic Drop Microextraction For Simultaneous Determination Of Trace Copper And Nickel, Fereshteh Islami-Bonab, Sanaz Sajedi-Amin, Saeed Mohammad Sorouraddin, Simin Maleknia, Abdolhossein Naseri
Multiple Objective Optimization Of Air Assisted Liquid-Liquid Microextraction Combined With Solidified Floating Organic Drop Microextraction For Simultaneous Determination Of Trace Copper And Nickel, Fereshteh Islami-Bonab, Sanaz Sajedi-Amin, Saeed Mohammad Sorouraddin, Simin Maleknia, Abdolhossein Naseri
Turkish Journal of Chemistry
he impact of rising levels of various heavy metals in the environment from multiple industrial, agriculture, domestic, and technological activities is of great concerns, as heavy metals cause serious health effects for both humans and wildlife. An effective and green chemistry procedure was used for simultaneous extraction of ultra-trace copper and nickel ions in natural waters (e.g. river and well waters) by air assisted liquid-liquid microextraction combined with solidified floating organic drop microextraction (AALLME-SFOD). The extraction of metal ions was conducted in a timescale of several minutes by conversion to metal chelates using sodium diethyldithiocarbamate (DDTC) as a chelating agent …
Feature Of Catalysis On Bimetallic Alloys Zr With V, Mo, And Fe In The Reaction Of Methanol Oxidation, Arif Efendi, Lala Magerramova, Adila Aliyeva, Lyudmila Kozharova, Elmir Babayev
Feature Of Catalysis On Bimetallic Alloys Zr With V, Mo, And Fe In The Reaction Of Methanol Oxidation, Arif Efendi, Lala Magerramova, Adila Aliyeva, Lyudmila Kozharova, Elmir Babayev
Turkish Journal of Chemistry
Catalytic behaviors of bimetallic catalysts-alloys of zirconium with vanadium, molybdenum, and iron was investigated in the oxidative dehydrogenation of methanol. The conditions for the formation of the catalyst's active surface were revealed. The conversion of methanol into formaldehyde, dimethyl ether, and dimethoxymethane on bimetallic catalysts was studied. The characterization of catalysts was performed by XRD, XPS, and SEM. It was shown that the activity of samples increases after O2 + H2 treatment and was associated with segregation of the active components of alloys (V, Mo) on the surface of catalysts and realization of their optimal oxidation state under catalysis conditions.
Theoretical Investigation On The Addition Reaction Of The Germylenoid H2gelicl With Acetone, Xiaolin Zhang, Bingfei Yan, Wenzuo Li
Theoretical Investigation On The Addition Reaction Of The Germylenoid H2gelicl With Acetone, Xiaolin Zhang, Bingfei Yan, Wenzuo Li
Turkish Journal of Chemistry
In this work, theoretical calculations were performed on the addition reaction of the germylenoid H2GeLiCl with acetone. The DFT M06-2X method was used to optimize the geometries of the whole stationary points on the potential energy surfaces and the QCISD method to calculate the single-point energy. The results reveal that the addition reaction of H2GeLiCl with acetone firstly generates an oxagermacyclopropane c-H2GeOC(CH3)2 and then c-H2GeOC(CH3)2 further reacts with acetone along two possible pathways, pathway I and pathway II, in which the 2,4-dioxagermolane is formed at the end of pathway I and 2,5-dioxagermolane is formed at the end of pathway II, …