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2021

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Articles 26551 - 26580 of 27884

Full-Text Articles in Physical Sciences and Mathematics

Quercetin Enhances Vitamin D2 Stability And Mitigate The Degradation Influenced By Elevated Temperature And Ph Value, Sukkum Ngullie Chang, Jeong Jun Lee, Hyun Jin Kim, Sun Chul Kang Jan 2021

Quercetin Enhances Vitamin D2 Stability And Mitigate The Degradation Influenced By Elevated Temperature And Ph Value, Sukkum Ngullie Chang, Jeong Jun Lee, Hyun Jin Kim, Sun Chul Kang

Turkish Journal of Chemistry

Vitamin D2 (vit. D2) is a nutraceutical essentially needed for good health. However, it is susceptible to oxygen and high temperature. The use of natural products such as bioflavonoids possessing anti-degradative effect of vit. D2 degradation has not been described before. A combinational effect of vit. D2 with quercetin showed a positive effect and inhibited vit. D2 degradation when exposed to high temperature (50 oC and 75 oC) at different time points. The results obtained revealed vit. D2 degradation was drastically increased with longer incubation under thermal treatment. However, quercetin and vit. D2 groups were able to significantly inhibit the …

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Hybrid Paper Sheets With Improved Barrier Properties, Çağla Söz Jan 2021

Hybrid Paper Sheets With Improved Barrier Properties, Çağla Söz

Turkish Journal of Chemistry

Hybrid paper sheets were prepared by applying a thin coating layer of cross-linked polydimethylsiloxane (PDMS) and inorganic particles onto Whatman Grade 1 filter paper substrates. Several coatings with different inorganic particle contents and types were applied onto the paper substrates to investigate the effect of the variation in the coating formulation on the (i) wetting, (ii) water barrier properties, (iii) air barrier properties, (iv) surface roughness, and (v) mechanical properties of the samples. It was revealed that the superhydrophobic hybrid paper sheets with significantly low air permeability and high water barrier properties could be prepared which is an indication that …

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Remarkable Bismuth-Gold Alloy Decorated On Mwcnt For Glucose Electrooxidation: The Effect Of Bismuth Promotion And Optimization Via Response Surface Methodology, Ömer Faruk Er, Berdan Ulaş, Hi̇lal Demi̇r Kivrak Jan 2021

Remarkable Bismuth-Gold Alloy Decorated On Mwcnt For Glucose Electrooxidation: The Effect Of Bismuth Promotion And Optimization Via Response Surface Methodology, Ömer Faruk Er, Berdan Ulaş, Hi̇lal Demi̇r Kivrak

Turkish Journal of Chemistry

In this study, the carbon nanotube supported gold, bismuth, and gold-bismuth (Au/MWCNT, Bi/MWCNT, and Au-Bi/ MWCNT) nanocatalysts were prepared with NaBH4 reduction method at varying molar atomic ratio for glucose electrooxidation (GAEO). The synthesized nanocatalysts at different Au: Bi atomic ratios are characterized via x-ray diffraction (XRD), transmission electron microscopy (TEM), and N2 adsorption-desorption. For the performance of AuBi/MWCNT for GAEO, electrochemical measurements are performed by using different electrochemical techniques namely cyclic voltammetry (CV), linear sweep voltammetry (LSV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS). Monometallic Au/MWCNT exhibits higher activity than Bi/MWCNT with 256.57 mA/mg (0.936 mA/cm2) current density. According …

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Preconcentration Of Rifampicin Prior To Its Efficient Spectroscopic Determination In The Wastewater Samples Based On A Nonionic Surfactant, Afaq Ullah Khan, Faheem Shah, Rafaqat Ali Khan, Bushra Ismail, Asad Muhammad Khan, Haji Muhammad Jan 2021

Preconcentration Of Rifampicin Prior To Its Efficient Spectroscopic Determination In The Wastewater Samples Based On A Nonionic Surfactant, Afaq Ullah Khan, Faheem Shah, Rafaqat Ali Khan, Bushra Ismail, Asad Muhammad Khan, Haji Muhammad

Turkish Journal of Chemistry

Every year, tuberculosis affects the lungs of millions of people and rifampicin is the commonly used medicine for its treatment due to its antibiotic nature. The frequent use of rifampicin may lead to its increased concentration in the water resources. This research work is focused on the cloud point extraction (CPE) procedure for the preconcentration of rifampicin prior to its determination in water. The UV/vis spectrophotometric method was adapted for the measurement of rifampicin content after the phase separation. Triton-X 100 was used as the nonionic surfactant which contains hydrophilic polyethylene chain feasible for the extraction of analyte. Various analytical …

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Sensitive And Selective Determination Of Imidacloprid With Magnetic Molecularly Imprinted Polymer By Using Lc/Q-Tof/Ms, Rai̇f İlktaç, Zi̇nar Pinar Gümüş Jan 2021

Sensitive And Selective Determination Of Imidacloprid With Magnetic Molecularly Imprinted Polymer By Using Lc/Q-Tof/Ms, Rai̇f İlktaç, Zi̇nar Pinar Gümüş

Turkish Journal of Chemistry

In this paper, magnetic-molecularly imprinted polymer was used for the preconcentration of trace levels of imidacloprid in water and apple samples prior to liquid chromatography-quadrupole-time-of-flight mass spectrometric determination. The selectivity of the magnetic polymer was united with the sensitivity and the high resolving power of the chromatographic system. The developed method showed a linear range from 10.0 to 500.0 μg/L. The quantitative recoveries were obtained for water and apple samples in the range of 92.0%-99.0 %. The relative standard deviations of intra-day and inter-day tests were found to be in the range of 0.8%-1.2% and 1.2%-1.6 %, respectively. In addition, …

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Supercritical Carbon Dioxide Extraction Of Usnea Longissima (L.) Ach.: Optimization By Box-Behnken Design (Bbd), Ceren Ati̇la Di̇nçer, Ceren Gökalp, Bengü Geti̇ren, Ati̇la Yildiz, Nuray Yildiz Jan 2021

Supercritical Carbon Dioxide Extraction Of Usnea Longissima (L.) Ach.: Optimization By Box-Behnken Design (Bbd), Ceren Ati̇la Di̇nçer, Ceren Gökalp, Bengü Geti̇ren, Ati̇la Yildiz, Nuray Yildiz

Turkish Journal of Chemistry

Usnic acid (UA) was extracted from Usnea longissima (L.) Ach. in supercritical carbon dioxide (SC-CO2) medium. The selected process parameters were extraction temperature (35-45 °C), amount of co-solvent (0%-5%) and extraction time (5-9 h). These parameters were applied to Box-Behnken design (BBD) belonging to response surface methodology (RSM) to determine optimum process parameters for the highest amount of UA in the extract. g UA/100g lichen, extraction yield % and UA content values were calculated in the range of 0.045-0.317, 2.77-5.4 and 71%-82% in different experimental conditions, respectively. The optimum conditions were predicted as 42 °C, 4.3% (ethanol) and 7.48 h. …

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Preparation And Characterization Of Templated Porous Carbons From Sucrose By One-Pot Method And Application As A Co2 Adsorbent, Meltem Gürbüz, Fatma Tümsek Jan 2021

Preparation And Characterization Of Templated Porous Carbons From Sucrose By One-Pot Method And Application As A Co2 Adsorbent, Meltem Gürbüz, Fatma Tümsek

Turkish Journal of Chemistry

The templated porous carbons were prepared from sucrose by one-pot method. In this method in which the pre-synthesis of the hard template is eliminated, the porous carbons were produced by organic-inorganic self-assembly of sucrose, tetraethyl ortosilicate (TEOS), Pluronic P123 and n-butanol in an acidic medium, and subsequent carbonization. The synthesis parameters such as sucrose amount, TEOS molar ratio and carbonization temperature were evaluated for describing their effects on the pore structures of the synthesized carbons. The prepared porous carbons were characterized by N2 adsorption, thermogravimetric analysis (TGA), Raman spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and transmission …

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Catalytic, Theoretical, And Biological Investigation Of An Enzyme Mimic Model, Gülci̇han Gülseren Jan 2021

Catalytic, Theoretical, And Biological Investigation Of An Enzyme Mimic Model, Gülci̇han Gülseren

Turkish Journal of Chemistry

Artificial catalyst studies were always stayed at the kinetics investigation level, in this work bioactivity of designed catalyst were shown by the induction of biomineralization of the cells, indicating the possible use of enzyme mimics for biological applications. The development of artificial enzymes is a continuous quest for the development of tailored catalysts with improved activity and stability. Understanding the catalytic mechanism is a replaceable step for catalytic studies and artificial enzyme mimics provide an alternative way for catalysis and a better understanding of catalytic pathways at the same time. Here we designed an artificial catalyst model by decorating peptide …

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Fibroin Nanofibers Production By Electrospinning Method, Derya Saltik Çi̇rki̇n, Meti̇n Yüksek Jan 2021

Fibroin Nanofibers Production By Electrospinning Method, Derya Saltik Çi̇rki̇n, Meti̇n Yüksek

Turkish Journal of Chemistry

Silk fibroin, which has many characteristic properties such as low inflammation reaction, biodegradation, suppleness, good antithrombogenic details, biocompatibility and high tensile strength is a very good candidate for biomedical applications. Electrospinning procures high surface area, porous, nanofiber dimension fiber generation, which is a plain method. An experimental study was carried out to produce nanofiber structure from silk fibroin by electrospinning and the electrospinning parameters for the spinning of uniform, continuous and silk fibroin fibers were optimized. As a result, the effect of variables of concentration, distance and applied voltage on the strength, thickness, surface structure, fiber diameter of nanomaterial was …

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Advances In Polymer Based Friedlander Quinoline Synthesis, Rajendra Patil, Jagdish Chavan, Shivnath Patel, Anil Beldar Jan 2021

Advances In Polymer Based Friedlander Quinoline Synthesis, Rajendra Patil, Jagdish Chavan, Shivnath Patel, Anil Beldar

Turkish Journal of Chemistry

Nitrogen containing heterocyclic compounds has acquired their remarkable and distinct place in the wide area of organic synthesis due to the broad range of applications. Among them, quinoline motifs have attracted researchers in the synthetic chemistry because of its presence in the large number of pharmacologically active compounds. Different methods for synthesis of quinoline derivatives are reported, among them the Friedlander synthesis have provided comparatively more efficient approach. Many of the reported conventional Friedlander methodologies have some problems such as difficult product isolation procedures, poor yields and use of expensive catalysts, etc. Recently, polymer or solid supported synthetic approaches have …

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Ultrasound Assisted Supramolecular Liquid Phase Microextraction Procedure For Sudan Iat Trace Level In Environmental Samples, Mustafa Soylak, Özgür Özalp, Furkan Uzcan Jan 2021

Ultrasound Assisted Supramolecular Liquid Phase Microextraction Procedure For Sudan Iat Trace Level In Environmental Samples, Mustafa Soylak, Özgür Özalp, Furkan Uzcan

Turkish Journal of Chemistry

A method based on supramolecular liquid phase microextraction has been developed for the preconcentration and determination of trace levels of Sudan I. 1-decanol and tetrahydrofuran were used as supramolecular solvent components. Trace levels of Sudan I were extracted into the extraction solvent phase at pH = 4.0 Analytical parameters such as pH value, supramolecular solvent volume, ultrasonication, centrifugation, model solution volume, matrix effects have been optimized. The limit of detection and the limit of quantification values for Sudan I were calculated as 1.74 μg L-1 and 5.75 μg L-1, respectively. In order to determine the accuracy of the method, addition …

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Low Loaded Pt-Co Catalyst Surfaces Optimized By Magnetron Sputtering Sequentialdeposition Technique For Pem Fuel Cell Applications: Physical And Electrochemicalanalysis On Carbon Paper Support, Osman Öztürk, Aydin Haşi̇moğlu, Oğuz Kaan Özdemi̇r, İnci̇ Karaaslan, Ali̇ Şems Ahsen Jan 2021

Low Loaded Pt-Co Catalyst Surfaces Optimized By Magnetron Sputtering Sequentialdeposition Technique For Pem Fuel Cell Applications: Physical And Electrochemicalanalysis On Carbon Paper Support, Osman Öztürk, Aydin Haşi̇moğlu, Oğuz Kaan Özdemi̇r, İnci̇ Karaaslan, Ali̇ Şems Ahsen

Turkish Journal of Chemistry

A series of thin Pt-Co films with different metal ratios were deposited by using the sequential cosputtering directly on a commercial hydrophobic carbon paper substrate at room temperature and in ultra-high vacuum (UHV) conditions. Their electrocatalytic properties toward the oxygen reduction reaction were investigated in 0.5 M H2SO4 solution by means of cyclic voltammetry (CV) and linear sweep voltammetry (LSV) on rotating disc electrode (RDE). The results showed that Pt particles, deposited by dc-magnetron gun, surround the large Co-clusters deposited by rf-magnetron gun. In addition, the increase of Co content led to an increase in the electrochemical active surface area …

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N Doping Of Tio2 Nanocrystal For Efficient Photodegradation Of Organic Pollutants Underultraviolet And Visible Light Irradiation, Xiaoyou Yu, Qianrui Lv Jan 2021

N Doping Of Tio2 Nanocrystal For Efficient Photodegradation Of Organic Pollutants Underultraviolet And Visible Light Irradiation, Xiaoyou Yu, Qianrui Lv

Turkish Journal of Chemistry

To decrease the band gap of TiO2 and enhance its photocatalytic performance, in this work, N-doped nanocrystalline TiO2 is synthesized successfully through a simple sol-gel synthesis process with dicyandiamide used as N source. The N-doped TiO2 photocatalysts have been characterized in detail by means of powder X-ray diffraction, Raman spectroscopy, infrared spectroscopy, UV-vis spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscope. The photocatalytic activities of N-doped TiO2 to different organic pollutants are significantly different. Using 2 × 10-5 mol/L methylene blue as the target pollutant, N-doped TiO2 can produced approximately 100% conversion within 40 min, the photocatalytic degradation ability of …

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Effect Of Fuel Choice On Conductivity And Morphological Properties Of Samarium Doped Ceria Electrolytes For It-Sofc, Burcu Aygün, Vedat Sariboğa, Mehmet Ali̇ Faruk Öksüzömer Jan 2021

Effect Of Fuel Choice On Conductivity And Morphological Properties Of Samarium Doped Ceria Electrolytes For It-Sofc, Burcu Aygün, Vedat Sariboğa, Mehmet Ali̇ Faruk Öksüzömer

Turkish Journal of Chemistry

The present investigation is emphasized on the effect of various combustion agents on the crystal properties, surface microstructure, and oxygen ion conductivity of 20% mole-Sm doped ceria (Ce0.80Sm0.20O1.90/SDC20) ceramics as solid electrolyte for ITSOFCs. The most widely used combustion agents for engineering ceramic production as ethylene glycol, diethylene glycol, triethylene glycol, L-alanine, L-valine, glycine, citric acid monohydrate, urea, and EDTA-citric acid were compared in terms of SDC20 properties. X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and electrochemical impedance spectroscopy (EIS) were used to determine the microstructure properties, crystal structure and ionic conductivity of SDC20 powder. XRD pattern …

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One-Pot Green Synthesized Protein-Based Silver Nanocluster As Prooxidant Biosensor, Esi̇n Akyüz Jan 2021

One-Pot Green Synthesized Protein-Based Silver Nanocluster As Prooxidant Biosensor, Esi̇n Akyüz

Turkish Journal of Chemistry

In this study, silver nanoclusters as prooxidant biosensor were eco-friendly synthesized using chicken egg white protein without any chemical reducing agents for measuring copper(II)-induced prooxidant activities of catechin, epicatechin, epigallocatechin gallate, resveratrol, gallic acid, chlorogenic acid, and rutin. The prooxidant activities were evaluated via measuring the absorption at 450 nm wavelength of the Cu(I)-neocuproine chelate formed by extraction of protein-bound Cu(I) with neocuproine reagent. Accuracy was determined by evaluating recovery values of wine, grape and apple samples and the obtained values were between 97.2%-98.9%. Intraday precision and inter-day reproducibility experiments were studied with three different experiments in a day and …

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Polycyclic Aromatic Hydrocarbon-Substituted Push-Pull Chromophores: An Investigationof Optoelectronic And Nonlinear Optical Properties Using Experimental And Theoreticalapproaches, Çağatay Dengi̇z Jan 2021

Polycyclic Aromatic Hydrocarbon-Substituted Push-Pull Chromophores: An Investigationof Optoelectronic And Nonlinear Optical Properties Using Experimental And Theoreticalapproaches, Çağatay Dengi̇z

Turkish Journal of Chemistry

A series of new push-pull chromophores were synthesized in moderate to very high yields (65%?97%) by treating TCNE and TCNQ with alkynes substituted by electron-rich diethylaniline and polycyclic aromatic hydrocarbons. Some of the chromophores exhibit strong intramolecular charge-transfer bands in the near-IR region with λmax values between 695 and 749 nm. With the help of experimental and theoretical analysis, it is concluded that the trend in λmax values is affected by PAH substituents sterically, not electronically. Steric constraints led to the increased dihedral angles, reducing conjugation efficiencies. The absorption properties of push-pull compounds have been investigated in solvents possessing different …

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Photocatalytic Decomposition Of Textile Dyestuffs By Photosensitive Metal Oxide Catalysts, Esra Yeli̇z Altun, Zehra Tuba Şi̇şmanoğlu, Güli̇n Selda Pozan Soylu Jan 2021

Photocatalytic Decomposition Of Textile Dyestuffs By Photosensitive Metal Oxide Catalysts, Esra Yeli̇z Altun, Zehra Tuba Şi̇şmanoğlu, Güli̇n Selda Pozan Soylu

Turkish Journal of Chemistry

Textile azo dyes are one of the pollutants in waste water that adversely affect human and environmental health. Removal of these chemicals from wastewater is important for eco-system and human health. In this study, Bi2O3 nanoflakes and ZnO were synthesized by the co-precipitation method. Adsorption and photocatalytic degradation reactions were carried out to remove dyes (Victoria blue (VB) and Malachite green (MG)) from wastewater with the photocatalysts. In order to improve the activity of catalysts, cetyltrimethylammoniumbromide (CTAB) was added as a surfactant to pure oxide structures, and Bi2O3-CTAB and ZnO-CTAB catalysts were prepared. The structural and morphological properties of these …

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Antiinfective Properties Of Ursolic Acid-Loaded Chitosan Nanoparticles Againststaphylococcus Aureus, Fatemeh Ghasemzadeh, Ghasem Najafpour, Maedeh Mohammadi Jan 2021

Antiinfective Properties Of Ursolic Acid-Loaded Chitosan Nanoparticles Againststaphylococcus Aureus, Fatemeh Ghasemzadeh, Ghasem Najafpour, Maedeh Mohammadi

Turkish Journal of Chemistry

The present study aimed to synthesize ursolic acid-loaded chitosan nanoparticles (UA-Ch-NPs) as an antiinfective agent against 21 Staphylococcus aureus isolates. The UA-Ch-NPs were synthesized by a simple method and then characterized by TEM, FTIR, DLS-zeta potential, and XRD analyses. According to the characterization results, highly dispersed spherical nanoparticles with a mean diameter of 258 nm and a zeta potential of + 40.1 mV were developed. The antibacterial properties of UA-Ch-NPs were investigated and their inhibitory effect on biofilm formation was demonstrated by AFM. Finally, the expression levels of icaA and icaD were measured using real-time PCR. Results indicated that the …

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Acetylene Hydrochlorination Over Tin Nitrogen Based Catalysts: Effect Of Nitrogen Carbondotsas Nitrogen Precursor, Yibo Wu, Fuxiang Li, Qingbin Li, Songtian Li, Ganqing Zhao, Xuerong Sun, Peisong Liu, Guoxv He, Yongjun Han, Liping Cheng, Shiying Luo Jan 2021

Acetylene Hydrochlorination Over Tin Nitrogen Based Catalysts: Effect Of Nitrogen Carbondotsas Nitrogen Precursor, Yibo Wu, Fuxiang Li, Qingbin Li, Songtian Li, Ganqing Zhao, Xuerong Sun, Peisong Liu, Guoxv He, Yongjun Han, Liping Cheng, Shiying Luo

Turkish Journal of Chemistry

The catalysts comprising the main active compounds of Sn-Nx were synthesized using trichlorophenylstannane ((C6H5)Cl3Sn), nitrogen carbon-dots (NCDs), and activated carbon (AC) as starting materials, and the activity and stability of catalysts was evaluated in the acetylene hydrochlorination. According to the results on the physical and chemical properties of catalysts (TEM, XRD, BET, XPS and TG), it is concluded that NCDs@AC can increase (C6H5)Cl3Sn dispersity, retard the coke deposition of (C6H5)Cl3Sn/AC and lessen the loss of (C4H5)Cl3Sn, thereby further promoting the stability of (C6H5)Cl3Sn/AC. Based on the characterization results of C2H2- TPD and HCl adsorption experiments, we proposed that the existence …

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Sn(Ii)/Pn@Ac Catalysts: Synthesis, Physical-Chemical Characterization, And Applications, Yibo Wu, Fuxiang Li, Qingbin Li, Yongjun Han, Li Wang, Wei Ma, Fu Xv Jan 2021

Sn(Ii)/Pn@Ac Catalysts: Synthesis, Physical-Chemical Characterization, And Applications, Yibo Wu, Fuxiang Li, Qingbin Li, Yongjun Han, Li Wang, Wei Ma, Fu Xv

Turkish Journal of Chemistry

In this study, the novel tin-based catalysts (Sn(II)/PN@AC) were prepared using the phosphorus and nitrogen dual-modified activated carbon as support and SnCl2 as active compounds, as well as then evaluated in acetylene hydrochlorination. Under the reaction temperature of 180 °C and an acetylene gas hourly space velocity (GHSV-C2H2) of 30 h?1, the 15%Sn(II)/PN@AC-550 showed the initial acetylene conversion of 100% and vinyl chloride selectivity over 98.5%. Additionally, the deactivation rate of 15%Sn(II)/PN@AC-550 reached 0.47% h-1, which was lower than that of 15%Sn(II)/AC-550 (1.02% h-1), suggesting that PN@AC-550 as novel support can retarded the deactivation of Sn(II)/AC-550 catalysts during acetylene hydrochlorination. …

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Surface And Chemical Characteristics Of Platinum Modified Activated Carbon Electrodesand Their Electrochemical Performance, Tuğrul Yumak, Serap Yumak, Abdulkeri̇m Karabulut Jan 2021

Surface And Chemical Characteristics Of Platinum Modified Activated Carbon Electrodesand Their Electrochemical Performance, Tuğrul Yumak, Serap Yumak, Abdulkeri̇m Karabulut

Turkish Journal of Chemistry

Platinum (Pt) loaded activated carbons (ACs) were synthesized by the thermal decomposition of platinum (II) acetylacetonate (Pt(acac)2) over chemically activated glucose-based biochar. The effect of Pt loading on surface area, pore characteristics, surface chemistry, chemical structure, and surface morphology were determined by various techniques. XPS studies proved the presence of metallic Pt0 on the AC surface. The graphitization degree of Pt loaded ACs were increased with the loaded Pt0 amount. The electrochemical performance of the Pt-loaded ACs (Pt@AC) was determined not only by the conventional three-electrode system but also by packaged supercapacitors in CR2032 casings. The capacitive performance of Pt@AC …

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A Survey On Surface Morphology Control Of Cross-Linked Poly(N-Vinylpyrrolidone)Polymer Particle Via Inverse Suspension Polymerization, Uğur Soykan, Sedat Çeti̇n Jan 2021

A Survey On Surface Morphology Control Of Cross-Linked Poly(N-Vinylpyrrolidone)Polymer Particle Via Inverse Suspension Polymerization, Uğur Soykan, Sedat Çeti̇n

Turkish Journal of Chemistry

This study mainly centers on the preparation and characterization of the cross-linked poly(NVP) microspheres by means of inverse suspension polymerization technique. The effect of the cross-linker content, the volumetric ratio of dispersed phase to suspension phase (DP/CP), agitation rate, and the reaction temperature on the characteristics of the microparticles were investigated meticulously using SEM, and the optimum preparation conditions were determined. The findings revealed that the morphological and surface properties of the obtained particles could be controlled easily by changing these parameters. Accordingly, the microparticles having the perfect spherical with smooth surface and good roundness, dumbbell-shaped, snowman besides dented, sunked …

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Preparation Of G-Cuo Nps And G-Zno Nps With Mallow Leaves, Investigation Of Theirantibacterial Behavior And Synthesis Of Bis(Indolyl)Methane Compounds Under Solventfreemicrowave Assisted Dry Milling Conditions Using G-Cuo Nps As A Catalyst, Mi̇ne Sulak Jan 2021

Preparation Of G-Cuo Nps And G-Zno Nps With Mallow Leaves, Investigation Of Theirantibacterial Behavior And Synthesis Of Bis(Indolyl)Methane Compounds Under Solventfreemicrowave Assisted Dry Milling Conditions Using G-Cuo Nps As A Catalyst, Mi̇ne Sulak

Turkish Journal of Chemistry

In this study, biogenic copper and zinc oxide nanoparticles (G-ZnONPs and G-CuONPs) were synthesized by the green synthesis method using Malva parviflora L. (Millow) leaf extract and the obtained nanoparticles were characterized in detail with UVVis, FTIR, SEM, XRD. The antibacterial properties of the synthesized nanoparticles on gram-positive and gram-negative bacteria were investigated and it was found that the nanoparticles had high antimicrobial activity in the results of the experiments. With the obtained G-CuONPs, the synthesis of bis(indolyl)methanes with the "green" one-pot synthesis using microwave was achieved quickly and with high efficiency, and the thermal behavior of the obtained products …

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Application Of Inverse Gas Chromatography In The Surface Characterization Of Diethanolamine Modified Polystyrene Based Polymer, Ayşegül Çi̇ğdem Adigüzel, Burak Korkmaz, Fati̇h Çakar, Bahi̇re Fi̇li̇z Şenkal, Özlem Cankurtaran Jan 2021

Application Of Inverse Gas Chromatography In The Surface Characterization Of Diethanolamine Modified Polystyrene Based Polymer, Ayşegül Çi̇ğdem Adigüzel, Burak Korkmaz, Fati̇h Çakar, Bahi̇re Fi̇li̇z Şenkal, Özlem Cankurtaran

Turkish Journal of Chemistry

In the present work, diethanol amine modified polystyrene based polymer (PVBC-Diethanol amine) was synthesized and characterized, then surface properties of the polymer were examined by inverse gas chromatography method at infinite dilution. The retention diagrams obtained based on the interaction of polar and nonpolar probes with the polymer were drawn over a temperature range from 30 to 55 °C. Through the diagrams, the dispersive component of the surface free energy, γSD of the polymer surface, and the specific enthalpy of adsorption, ΔHAS , of probes on the polymer were also calculated. Lewis acid, KA, and Lewis base, KD, parameters of …

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Gc-Ms Analyses And Bioactivities Of Essential Oil Obtained From The Roots Ofchrysopogon Zizanioides (L.) Roberty Cultivated In Giresun, Turkey, Derya Efe, Mustafa Karaköse, Ayça Aktaş Karaçeli̇k, Bengü Ertan, Mehmet Emi̇n Şeker Jan 2021

Gc-Ms Analyses And Bioactivities Of Essential Oil Obtained From The Roots Ofchrysopogon Zizanioides (L.) Roberty Cultivated In Giresun, Turkey, Derya Efe, Mustafa Karaköse, Ayça Aktaş Karaçeli̇k, Bengü Ertan, Mehmet Emi̇n Şeker

Turkish Journal of Chemistry

The essential oils (EOs) constituents have trade importance due to their bioactivities. In this research, the essential oil of the roots of Chrysopogon zizanioides (L.) Roberty cultivated in Giresun was obtained by hydrodistillation. Then, the chemical composition and biological activities of Chrysopogon zizanioides root essential oil (CEO) were studied. Thirty compounds were identified by gas chromatography-mass spectrometry (GC-MS) and the major compounds were determined as isobutyl-angelate (11.15%), α-muurolene (10.56%), α-cedrene (8.42%), α-patchoulene (8.10%), and ethylene brassylate (7.49%). The antimicrobial effect of CEO was investigated against pathogenic bacteria and fungus. Minimal inhibition concentration (MIC) was determined 31.25 μg/mL against C. albicans …

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Chemical Composition And Biological Activities Of Essential Oils Of Two New Chemotypes Of Glebionis Cass., Hüseyi̇n Servi̇ Jan 2021

Chemical Composition And Biological Activities Of Essential Oils Of Two New Chemotypes Of Glebionis Cass., Hüseyi̇n Servi̇

Turkish Journal of Chemistry

This paper includes the result of the first study of the chemical composition, antioxidant, antiinflammatory, and antidiabetic activities of the essential oils of Glebionis coronaria (L.) Cass. ex Spach and Glebionis segetum (L.) Fourr. from Turkey. In the current study, nine and twenty-eight constituents were determined in the essential oils of aerial parts of G. coronaria (GCE) (92.1%) and G. segetum (GSE) (90.0%), respectively. The main components were capillin (65.9%) in GCE, capillene (53.4%) in GSE. The essential oil compositions were evaluated and compared with previous researches. In the current study, the plants are classified as chemotypes of Glebionis species. …

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Pyridine Substituted Bodipys: Synthesis, Characterization And Cholinesterease,α-Glucosidase Inhibitory, Dna Hydrolytic Cleavage Effects, Burak Barut, Hüseyi̇n Baş, Zekeri̇ya Biyiklioğlu Jan 2021

Pyridine Substituted Bodipys: Synthesis, Characterization And Cholinesterease,α-Glucosidase Inhibitory, Dna Hydrolytic Cleavage Effects, Burak Barut, Hüseyi̇n Baş, Zekeri̇ya Biyiklioğlu

Turkish Journal of Chemistry

In this study, the synthesis of new monostyryl (BDPY-2) and distyryl BODIPY dyes (BDPY-4, BDPY-5) containing pyridine groups has been reported for the first time. The acetylcholinesterase from Electrophorus electricus (AChE), butyrylcholinesterase from equine serum (BuChE), α-glucosidase from Saccharomyces cerevisiae and DNA hydrolytic cleavage actions of BDPY-2, BDPY-4, BDPY- 5 were investigated using various techniques. The results indicated that the compounds had varying inhibition properties against AChE, BuChE, and α-glucosidase. BDPY-4 was the most potent compound on AChE with IC50 of 54.78 ± 4.51 μM, and Lineweaver-Burk plots indicated that the compound is bound to a site other than the …

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Characterization Of Extracts From Papaver Rhoeas And Potential Valorization Of Theseextracts In Dyeing Applications, Mohand Ouidir Boussoum, Rachida Ouldmokhtar, Abdelkader Ali Nehari, Beatrice George Jan 2021

Characterization Of Extracts From Papaver Rhoeas And Potential Valorization Of Theseextracts In Dyeing Applications, Mohand Ouidir Boussoum, Rachida Ouldmokhtar, Abdelkader Ali Nehari, Beatrice George

Turkish Journal of Chemistry

The aim of our work is to study the dyeing properties of extracts from natural sources such as Papaver rhoeas by modifying the conditions of the dyeing process, choosing other substrates that could be pretreated by innovative and environmentally friendly processes. The results obtained show a fairly high fixation of the extracts on the natural and artificial fibers. The use of mordants allowed the dye to be better fixed on the dyed fibers and to give several shades to the fabric. The rate of essential oil contained in Papaver rhoeas was considered important by the Clevenger process. Screening of extractive …

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Enhancement Of Dispersion Stability Of Inorganic Additives Via Poly(Sodium-4-Styrenesulfonate) Treatment Geared To Hydrogel Applications, Fi̇li̇z Boran, Merve Okutan Jan 2021

Enhancement Of Dispersion Stability Of Inorganic Additives Via Poly(Sodium-4-Styrenesulfonate) Treatment Geared To Hydrogel Applications, Fi̇li̇z Boran, Merve Okutan

Turkish Journal of Chemistry

This study reports the preparation of poly(sodium-4-styrene sulfonate) (PSS) treated bentonite and clinoptilolite to prevent the agglomeration and sedimentation of these inorganic fillers during the preparation of hydrogel. For this purpose PSS treated fillers were prepared by using various techniques (dip and dry, hydrothermal, one-step ball milling and ultrasonication methods). The most suitable technique for preparing these PSS treated inorganic fillers (abbreviated as BP-dip and CP-dip) was the dip and dry method. BP-dip and CP-dip based polyvinyl alcohol/polyvinylpyrrolidone (PVA/PVP) composite hydrogels were prepared using the freeze/ thawing method after the addition of one of BP-dip and CP-dip inorganic fillers in …

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Dft (Density Functional Theory) Studies On Cycloisomerization Of 15-Memberedtriazatriacetylenic Macrocycle, Mansooreh Movahedi, Nader Zabarjad Hiraz, Ali Ezabadi, Marjaneh Samadizadeh, Mohamad Reza Talei Bavil Olyai Jan 2021

Dft (Density Functional Theory) Studies On Cycloisomerization Of 15-Memberedtriazatriacetylenic Macrocycle, Mansooreh Movahedi, Nader Zabarjad Hiraz, Ali Ezabadi, Marjaneh Samadizadeh, Mohamad Reza Talei Bavil Olyai

Turkish Journal of Chemistry

The mechanism as well the stereochemistry of cascade cycloisomerization of 15-membered triazatriacetylenic macrocycle was investigated theoretically by using M062X/6-31+G(d,p) and M062X/LANL2DZ calculations. The results showed that the mechanism and outcome of the reaction depended on the absence and presence of a transition metal catalyst. So that, in thermal-induced condition, the reaction had to experience several suprafacial concerted reactions including Ene-reaction (ΔG#=35.38 kcal/mol), Diels-Alder cycloaddition (ΔG# = 17.16 kcal/mol), and sigmatropic H-shift rearrangement (ΔG# = 56.21 kcal/mol) to produce diastereoselective fused cis-tetracyclic aromatic bearing a pyrrole moiety by following kinetic considerations. Also, the [2+2+2] cycloaddition mechanism was neglected in thermal?induced conditions …

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