Catalytic Hydrogenation Of Furfural And Furfuryl Alcohol To Fuel Additives And Value-Added Chemicals,
2019
TÜBİTAK
Catalytic Hydrogenation Of Furfural And Furfuryl Alcohol To Fuel Additives And Value-Added Chemicals, Obaid Aldosari, Hamed Alshammari, Mosaed Alhumaimess, Ibrahim Wawata
Turkish Journal of Chemistry
The selective hydrogenation of furfural and furfuryl alcohol at different temperatures has been studied using several catalysts. The effect of various reaction conditions (pressure, catalyst amount, and solvent) was studied. We have shown that Pd/TiO$_{2}$ catalysts can be very effective for the synthesis of 2-methylfuran at room temperature. Using octane as a solvent, the solvent effectiveness was investigated and showed actively high selectivity towards 2-methylfuran and furfuryl alcohol, but there were many byproducts that were still noticed. Although adding Ru to the Pd/TiO$_{2}$ catalyst contributed to reducing the catalytic activity, this addition improved the selectivity to 2-methylfuran and furfuryl alcohol …
Comparative Study Of Solvent Extraction Of Molybdenum By Various Extractants,
2019
TÜBİTAK
Comparative Study Of Solvent Extraction Of Molybdenum By Various Extractants, Abdoul Rachid Chaibou Yacouba, Salmana Laouali Ibrahim, Ibrahim Natatou
Turkish Journal of Chemistry
Solvent extraction of molybdenum from various acid media by Alamine 336, Aliquat 336, TOPO, and DEHPA in kerosene was studied. The extraction efficiency of molybdenum by diisobutyl ketone (DIBK), the effects of various parameters like diluents, mineral acids, extractant concentration, and applications of these extractants on molybdenum extraction contained in the uranium-bearing ore solutions were investigated. DIBK used as solvent can indeed extract the molybdenum without adding any extractants in the range of 20-50 mg/L. Molybdenum was extracted by Aliquat 336 in all mineral acids at more than 90%. On the basis of slope analysis, the compositions of the extracted …
Electrodeposition Of Tin(Ii) From Citrate Complexes,
2019
TÜBİTAK
Electrodeposition Of Tin(Ii) From Citrate Complexes, Yuliya Yapontseva, Valeriy Kublanovsky
Turkish Journal of Chemistry
This paper provides the calculation of the distribution of the concentrations of complex particles of the Sn(II) - citrate - water system in the solution volume, on the surface of the electrode, and in the diffusion layer for the tin citrate electrolyte containing an excess of the ligand. Based on the calculations for the electrodeposition of tin, an electrolyte containing [SnCit]$^{2-}$ complex at pH 8.0 was chosen. The kinetic parameters of the discharge stage, the diffusion coefficient of the electrochemical active ion, and the current efficiency of tin were determined by the methods of stationary voltammetry and chronovoltamperometry. It is …
The Protective Effect Of N-Acetylcysteine Amide Against Paraquat-Induced Neurotoxicity,
2019
TÜBİTAK
The Protective Effect Of N-Acetylcysteine Amide Against Paraquat-Induced Neurotoxicity, Burhan Ateş, Ni̇gar Vardi, Hakan Parlakpinar, Merve Gökşi̇n Karaaslan, İsmet Yilmaz, Nuran Ercal
Turkish Journal of Chemistry
N-acetylcysteine amide (NACA) is a new antioxidant molecule with powerful radical scavenging properties. The aim of this study was to investigate neuroprotective effects of NACA against paraquat (PQ) toxicity in the midbrains of rats by using motor coordination tests and biochemical and histological analysis. Thirty adult Wistar albino rats were divided into three groups: Group 1: control (n = 10), Group 2: PQ (10 mg/kg) (n = 10), and Group 3: PQ (10 mg/kg) $+$ NACA (100 mg/kg) (n = 10). NACA was administrated intraperitoneally 30 min before PQ injection. Performance was measured for a period of 28 days. The …
Optical Characterization Of Salt-Induced Swelling Behavior Of Poly($N$-Isopropylacrylamide) Terpolymer Hydrogel Layers,
2019
TÜBİTAK
Optical Characterization Of Salt-Induced Swelling Behavior Of Poly($N$-Isopropylacrylamide) Terpolymer Hydrogel Layers, İlke Anaç, Anil Bozdoğan
Turkish Journal of Chemistry
This study reports for the first time the effect of different sodium halide salts (NaClO$_{4}$, NaI, and Na$_{2}$CO$_{3})$ in the low concentration range (in the range of 10$^{-7}$-1 M) on the swelling behavior of photo-crosslinked, surface-immobilized poly($N$-isopropyl acrylamide) (PNIPAAm) terpolymer layers. PNIPAAm terpolymer (consisting of $N$-isopropylacrylamide, methacrylic acid, and 4-methacryloxybenzophenone) was synthesized via free radical polymerization. The PNIPAAm terpolymer layers were prepared on gold substrates via spin coating and crosslinked and surface attached via UV radiation. The swelling behavior of the layers in monovalent (NaClO$_{4}$ and NaI) and divalent (Na$_{2}$CO$_{3})$ solutions was monitored by surface plasmon/optical waveguide spectroscopy. The terpolymer …
Coumarin-Based Benzilmonohydrazone As A New Proton-Sensitive Fluorescence Dye: Synthesis And Investigation Of Photophysical And Acidochromic Properties, Burcu Aydiner
Turkish Journal of Chemistry
Coumarin-based chromogenic and fluorogenic dye 4 was designed and synthesized. The photophysical properties of 4 were determined in solvents with different polarities. Protonation affinity was determined by adding trifluoroacetic acid (TFA) to a dichloromethane solution of dye 4 utilizing the UV-Vis and fluorescence titration methods. The protonation region was investigated by using the $^{1}$H NMR method. Additionally, DFT and TDDFT studies were performed to support the structural and absorption spectral properties of 4.
Novel Voltammetric Investigation Of Dipyridamole At A Disposable Pencil Graphite Electrode,
2019
TÜBİTAK
Novel Voltammetric Investigation Of Dipyridamole At A Disposable Pencil Graphite Electrode, Iulia Gabriela David, Lorelei Iordache, Dana Elena Popa, Mihaela Buleandra, Victor David, Emilia-Elena Iorgulescu
Turkish Journal of Chemistry
The present paper describes the voltammetric analysis of dipyridamole (DIP) at a cheap, disposable pencil graphite electrode (PGE). The working conditions were optimized with regard to the electrode material and the supporting electrolyte. Cyclic voltammetric investigations emphasized that DIP is irreversibly oxidized at the PGE. The electrode process is pH-dependent and controlled by both diffusion and adsorption. For DIP quantitative determination a differential pulse voltammetric (DPV) method in phosphate buffer solution pH 7.00 was developed. DIP's oxidation peak current varied linearly with the analyte concentration, presenting two linear ranges, namely 5.00 $\times $ 10$^{-7}$-2.50 $\times $ 10$^{-5}$ M and 2.50 …
Synthesis And Bioactivity Of Sulfide Derivatives Containing 1,3,4-Oxadiazole And Pyridine,
2019
TÜBİTAK
Synthesis And Bioactivity Of Sulfide Derivatives Containing 1,3,4-Oxadiazole And Pyridine, Gang Yu, Shunhong Chen, Feng He, Dexia Luo, Yu Zhang, Jian Wu
Turkish Journal of Chemistry
A series of novel sulfide derivatives containing 1,3,4-oxadiazole and pyridine were synthesized, characterized, and tested for their antibacterial activity against tobacco bacterial wilt and rice bacterial blight and for insecticidal activity toward diamondback moth. The results showed that some compounds had good insecticidal and bactericidal activity, e.g., the activities of compounds 6e and 6g-6j toward tobacco bacterial wilt were much better than those of commercial thiodiazole-copper, and some of the synthesized compounds possessed good insecticidal activity against Plutella xylostella. Compounds 6d, 6h, 6j, 6l, 6p, 6r, and 6p displayed over 93% activity at 500 mg L$^{-1}$.
$N$-Acylazole Mediated Stereoselective And Regioselective Synthesis Of $N$-Substituted Azole Acrylonitriles,
2019
TÜBİTAK
$N$-Acylazole Mediated Stereoselective And Regioselective Synthesis Of $N$-Substituted Azole Acrylonitriles, Osman Aydin, Şule Kökten, Hakan Ünver, İlhami̇ Çeli̇k
Turkish Journal of Chemistry
Regio- and stereoselective synthesis of $N$-substituted azole acrylonitriles has been achieved smoothly in $N,N$-dimethylformamide (DMF) in the presence of potassium carbonate (K$_{2}$CO$_{3})$ as a base catalyst. $N$-Substituted azole acrylonitriles were obtained in moderate to good yields (39%-87%) with a one-pot reaction between readily available $N$-acetylazoles and Baylis-Hillman nitriles. The structural determinations were accomplished by NOESY $^{1}$H NMR and X-ray crystallography.
Molecular Dynamics Simulations Of Adsorption Of Long Pyrene-Peg Chains On A Thin Carbon Nanotube,
2019
TÜBİTAK
Molecular Dynamics Simulations Of Adsorption Of Long Pyrene-Peg Chains On A Thin Carbon Nanotube, Peli̇n Deni̇z Akkuş, Ayşe Özge Kürkçüoğlu Levi̇tas
Turkish Journal of Chemistry
Carbon nanotubes have emerged as highly promising theranostic agents due to their unique structural/physical features, high surface area, and high drug-loading capacity. The high cytotoxicity of carbon nanotubes can be eliminated by noncovalent coating using hydrophilic polymers. We investigated the adsorption of long pyrene functionalized polyethylene glycol (PEG) chains, PEG$_{2000}$ and PEG$_{5000}$, on a single-walled carbon nanotube (SWNT) from a crowded solution. Full-atom molecular dynamics simulations in explicit water were used to mimic the experimental conditions of noncovalent PEGylation with a stoichiometry of one SWNT to ten pyrene-PEG. Although the diffusional behavior of the pyrene molecules still attached to the …
Detection Of Lard Contamination In Five Different Edible Oils By Ft-Ir Spectroscopy Using A Partial Least Squares Calibration Model, Fazeelah Munir, Syed Ghulam Musharraf, Syed Tufail Hussain Sherazi, Muhammad Imran Malik, Muhmmad Iqbal Bhanger
Turkish Journal of Chemistry
Lard is defined as animal fat acquired from the adipose tissue of pigs and is not permitted for human consumption or external use by certain religions such as Islam and Judaism. Due to its low-cost availability for commercial use, it is often mixed with other vegetable oils mistakenly or deliberately and causes loss of consumer trust; hence, its detection in food products is essential. Consumers tend to know the authenticity of commercially available edible oils. However, edible oils are subjected to adulteration risks with lard, which breaches consumer rights. In the present study, we designed a transmission Fourier transform infrared …
Synthesis Of Smz Derivatives And Investigation Of Effects On Germination, Root, And Plant Growth Of \Textit{Arabidopsis Thaliana} L., Tuğba Güngör, Ferah Cömert Önder, Fati̇h Sezer, Aslihan Özbi̇len, Kemal Meli̇h Taşkin, Mehmet Ay
Turkish Journal of Chemistry
A series of sulfonamide derivatives were synthesized by reactions with various functional groups containing benzenesulfonyl chlorides and aniline derivatives under different substitution reaction conditions. The structures of SMZ derivatives were confirmed with melting point, FT-IR, $^{1}$H NMR, $^{13}$C NMR, and LC-MS/MS techniques. In order to investigate the cytotoxic effects of these derivatives, we used a model plant species. The synthesized compounds (S1-S5) and sulfamethazine (SMZ) as a positive control were applied to Arabidopsis thaliana seeds. Our results indicated that S3 and S4 induced shorter roots and lower wet weight in plants. Plants treated with S2 and S5 showed no growth …
On The Azo Dyes Derived From Benzoic And Cinnamic Acids Used As Photosensitizers In Dye-Sensitized Solar Cells,
2019
TÜBİTAK
On The Azo Dyes Derived From Benzoic And Cinnamic Acids Used As Photosensitizers In Dye-Sensitized Solar Cells, Luka Matovic, Nikola Tasic, Nemanja Trisovic, Jelena Ladarevic, Vesna Vitnik, Zeljko Vitnik, Branimir Grgur, Dusan Mijin
Turkish Journal of Chemistry
In order to get a better insight into the relationship between molecular structure and photovoltaic performance, six monoazo dye molecules containing benzoic and cinnamic acid moieties were synthesized and their photovoltaic properties were studied. Three of them have not been previously used in solar cells. Spectroscopic measurements of the investigated compounds coupled with theoretical calculations were performed. Short-circuit current density, open-circuit voltage, and fill-factor were determined. It was found that a larger amount of short-circuit current density will be generated if the HOMO--LUMO energy gap is lower, determined by the stability of the molecule and the electronic effect of the …
Reduced Graphene Oxide Supported Tin Oxide-Boron Oxide Flexible Paper Anodes For Li-Ion Batteries,
2019
TÜBİTAK
Reduced Graphene Oxide Supported Tin Oxide-Boron Oxide Flexible Paper Anodes For Li-Ion Batteries, Hi̇lal Köse, Şeyma Dombaycioğlu, Hatem Akbulut, Ali̇ Osman Aydin
Turkish Journal of Chemistry
Freestanding tin oxide-boron oxide/reduced graphene oxide (SnO$_{2}$-B$_{2}$O$_{3}$/rGO) nanocomposite anode was produced for Li-ion cells. This binder-free flexible paper anode structure was fabricated by combining SnO$_{2}$-B$_{2}$O$_{3}$ composite and graphene oxide which were synthesized through the sol-gel method and Hummers' method, respectively. Field emission gun scanning electron microscopy, high-resolution transmission electron microscopy, energy dispersive X-ray spectrometer, Fourier transform infrared spectroscopy, Raman spectroscopy, and X-ray diffraction were utilized to characterize anode materials. The Williamson-Hall (W-H) analysis was applied using XRD data to determine crystal size and strain of the lattice. Electrochemical tests, cyclic voltammetry, and electrochemical impedance spectroscopy measurements were performed to determine …
Density Functional Theory-Supported Studies Of Structural And Electronic Properties Of Substituted-Phenol Derivatives Synthesized By Efficient O- Or C-Arylation Via Chan--Lam Or Suzuki Cross-Coupling Reactions, Hafiz Mansoor Ikram, Nasir Rasool, Muhammad Ali Hashmi, Muhammad Arfan Anjum, Kulsoom Ghulam Ali, Muhammad Zubair, Gulraiz Ahmad, Tariq Mahmood
Turkish Journal of Chemistry
The present study reports the efficient synthesis and computational studies of the structural and electronic properties of some interesting substituted phenol derivatives. Efficient and versatile procedures to synthesize a series of diaryl ether derivatives (2a-2c, 4a-4h) and bis-arylated products (5a-5c) are described. In this manuscript, using the commercially available starting material 1 and 3, a 1-step approach was developed by means of Cu(II)-mediated Chan-Lam and Pd-catalyzed Suzuki cross-coupling reactions to synthesize diaryl ether and bis-arylated products with moderate to good yields. The starting substrates, 2-bromo-4-methylphenol 1 or 2,4-dibromophenol 3, were both treated with several arylboronic acids, which led to the …
Mwcnts-Fe$_{2}$O$_{3}$ Nanoparticle Nanohybrid-Based Highly Sensitive Electrochemical Sensor For The Detection Of Kaempferol In Broccoli Samples, Nomnotho Jiyane, Myalowenkosi I. Sabela, Suvardhan Kanchi, Phumlane S. Mdluli, Mavis Xhakaza, Olayide A. Arodola, Krishna Bisetty
Turkish Journal of Chemistry
This work reports an electrochemical sensor with a modified glassy carbon electrode for the detection of kaempferol. The method was tailored by the immobilization of multiwalled carbon nanotubes (MWCNTs) assimilated with Fe$_{2}$O$_{3}$ nanoparticles (NPs) onto the electrode surface to detect kaempferol using differential pulse voltammetry. Thermogravimetric, transmission electron microscopic, cyclic, and differential voltammetric techniques were employed to characterize the developed electrochemical sensor. The kaempferol produces an anodic quasireversible peak at pH 6.6 in phosphate buffer with Fe$_{2}$O$_{3}$NPs/MWCNTs/GCE. The current of the anodic peak at 0.32 V increases linearly upon addition of kaempferol standard, resulting in Ip($\mu $A) = 1.577($\mu $M) …
Natural Diterpenoid Alysine A Isolated From Teucrium Alyssifolium Exerts Antidiabetic Effect Via Enhanced Glucose Uptake And Suppressed Glucose Absorption, Alaatti̇n Şen, Buket Ayar, Anil Yilmaz, Özden Özgün Acar, Gurbet Çeli̇k Turgut, Gülaçti Topçu
Turkish Journal of Chemistry
Teucrium species have been used in folk medicine as antidiabetic, antiinflammatory, antiulcer, and antibacterial agents. We have explored in vitro antidiabetic impacts of 2 natural diterpenoids, alysine A and alysine B, isolated from Teucrium alyssifolium. The lactate dehydrogenase (LDH) cytotoxicity assay, glucose uptake test, glucose utilization (glycogen content) test, glucose transport test, glucose absorption ($\alpha $-glucosidase activity) test, insulin secretion test, RNA isolation and cDNA synthesis assay, qPCR quantification assays, and statistical analyses were carried out in the present study. Alysine A exerted the following effects at non-cytotoxic doses: . Enhanced the glucose uptake, as much as the insulin in …
Anticancer And Antiangiogenesis Activities Of Novel Synthesized 2-Substituted Benzimidazoles Molecules,
2019
TÜBİTAK
Anticancer And Antiangiogenesis Activities Of Novel Synthesized 2-Substituted Benzimidazoles Molecules, Adem Güner, Eli̇fsu Polatli, Tamer Akkan, Hakan Bektaş, Canan Albay
Turkish Journal of Chemistry
In this study, novel 2-substituted benzimidazoles molecules having triazole, thiadiazole, and oxadiazole rings were synthesized and were evaluated by anticancer, antioxidant/oxidant status, genotoxicity, and antiangiogenesis assays. Anticancer activity of the compounds was determined by MTT (0.5, 5, and 50 $\mu $g/mL) and lactate dehydrogenase (LDH) release assays against human prostate and breast cancer cells. Oxidative status of cells was elicited by total oxidative stress and total antioxidant capacity methods. Chick chorioallantoic membrane assay was used to evaluate the antiangiogenic activity. Genotoxicity was evaluated by the sister chromatid exchange (SCE) and micronucleus (MN) tests in lymphocyte cultured human blood. Our results …
Silylation Of Epoxidized Soybean Oil With Triethoxysilanes, Synthesis And Characterization Of Their Polyurethanes,
2019
TÜBİTAK
Silylation Of Epoxidized Soybean Oil With Triethoxysilanes, Synthesis And Characterization Of Their Polyurethanes, Aynur Özşeker, Kemal Karadeni̇z, Mustafa Yasi̇n Şen
Turkish Journal of Chemistry
Silylation of epoxidized soybean oil (ESBO) was carried out by epoxy ring opening reaction of methoxy and ethoxy silane compounds. $^{1}$H NMR and FTIR spectra confirmed that two novel bio-based polyols, PSiTh and PSiAm, were obtained through the ring opening of epoxy by the mercapto and amino moieties of MPTMS and APTES, respectively. Polyurethanes of these polyols were prepared using 4,4'- methylene-bis(phenyl isocyanate) (MDI) to incorporate silanol groups into polymer network and were labeled as PUSiTh and PUSiAm, respectively. To see the impact of silanol and phosphorous groups on flame retardant properties, the chain extended polyurethanes, PUSiThCE and PUSiAmCE were …
Extraction Of High-Purity Silica From Rice Husk Via Hydrochloric Acid Leaching Treatment,
2019
TÜBİTAK
Extraction Of High-Purity Silica From Rice Husk Via Hydrochloric Acid Leaching Treatment, Seitkhan Azat, Zhanar Sartova, Kalampyr Bekseitova, Kydyr Askaruly
Turkish Journal of Chemistry
The present paper aimed at the investigation of the effect of preliminary acid treatment on the structure and purity of extracted silica. In this study, the acid leaching of rice husk (RH) in 2 M hydrochloric acid solution before the calcination process at 600 $^{\circ}$C was proposed to achieve completely white silica with high specific surface area and low content of impurities. RH, selected from the Almaty Region, Kyzylorda Region, and Turkestan Region was used as the main silica source. The results confirmed that the highest purity (98.2%-99.7%) amorphous silica with a specific surface area between 120 and 980 m$^{2}$ …
