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Articles 6091 - 6120 of 33164

Full-Text Articles in Chemistry

Chromatographic Evaluation Of Tocols And Sterols Of Processed Canola Oil And Deodorizerdistillate, Hadia Shoaib, S. Tufail Sherazi, Saba Naz, Dr Sarfaraz Ahmed Mahesar, Abdul Rauf Khaskheli, Siraj Uddin, Ahmed Raza Sidhu, Hami̇de Fi̇li̇z Ayyildiz, Hüseyi̇n Kara, Mustafa Topkafa Jan 2022

Chromatographic Evaluation Of Tocols And Sterols Of Processed Canola Oil And Deodorizerdistillate, Hadia Shoaib, S. Tufail Sherazi, Saba Naz, Dr Sarfaraz Ahmed Mahesar, Abdul Rauf Khaskheli, Siraj Uddin, Ahmed Raza Sidhu, Hami̇de Fi̇li̇z Ayyildiz, Hüseyi̇n Kara, Mustafa Topkafa

Turkish Journal of Chemistry

Tocopherols and tocotrienols in the combined form are known as tocols. Changes of total and individual tocols and sterols concentration of canola oil and deodorizer distillate (DD) during different processing stages were evaluated with the application of gas chromatography (GC) and high-performance liquid chromatography (HPLC). For sterols analysis, GC coupled with flame ionization detector (FID) was used while tocols in canola oil samples and DD, normal phase (NP) HPLC was applied. The results of the present study indicated that levels of total and individual tocols and sterols content were decreased during processing (neutralization to deodorization). Deodorization was found to be …

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Clerodendrum Serratum Extract Attenuates Production Of Inflammatory Mediators Inovalbumin-Induced Asthma In Rats, Poonam Arora, Shahid Hamid Ansari, Lalit Mohan Nainwal Jan 2022

Clerodendrum Serratum Extract Attenuates Production Of Inflammatory Mediators Inovalbumin-Induced Asthma In Rats, Poonam Arora, Shahid Hamid Ansari, Lalit Mohan Nainwal

Turkish Journal of Chemistry

In the present study, ethanolic extract of Clerodendrum serratum roots was investigated for its potential to reverse some features of bronchial asthma in ovalbumin-induced murine model of asthma. Clerodendrum serratum commonly called bharangi, (family Solanaceae) is a well-known anti-allergic drug in Asian folk system of medicines. In the present work, pharmacological studies are done to provide scientific evidence for therapeutic potential of plant in allergic asthma. Asthma was induced in experimental rats with allergen suspension of ovalbumin and aluminum hydroxide followed by treatment with dexamethasone (2.5 mg/kg, po) or C. serratum root extract (0.53 and 5.3 mg/kg, b. w., po). …

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Thermodynamic And Kinetic Study Of Adsorptive Removal Of Lead By The Nanocompositeloaded Nanofibers, Urwa Mahmood, Sharjeel Abid, Bilal Qadir, Ahsan Nazir, Tanveer Hussain Jan 2022

Thermodynamic And Kinetic Study Of Adsorptive Removal Of Lead By The Nanocompositeloaded Nanofibers, Urwa Mahmood, Sharjeel Abid, Bilal Qadir, Ahsan Nazir, Tanveer Hussain

Turkish Journal of Chemistry

Herein, the fabrication of electrospun nanocomposites, using polyacrylonitrile nanofibers (PNF) modified with nanobentonite and fly ash, is explained. Further, the use of electrospun adsorbent for the remediation of Pb (II) ions from water has been explored. Pristine PNF and nanocomposites were characterized using SEM, EDX, and FTIR to analyze surface topology, elemental composition, and functional groups, respectively. The adsorptive behavior of developed adsorbents was investigated using the effects of dosage, initial concentration, time, and temperature. Pseudo-second order kinetics fit well with experimental data and the adsorption followed intra-particle diffusion. The thermodynamics study confirmed spontaneous endothermic adsorption of the heavy metal. …

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Selective Catalytic Hydrogenation Of Cellulose Into Sorbitol With Ru-Based Catalysts, Ceren Orak, Aycan Sapmaz, Asli Yüksel Özşen Jan 2022

Selective Catalytic Hydrogenation Of Cellulose Into Sorbitol With Ru-Based Catalysts, Ceren Orak, Aycan Sapmaz, Asli Yüksel Özşen

Turkish Journal of Chemistry

Sorbitol is one of the platform chemicals and can be produced from various renewable and sustainable sources via different processes. Hydrothermal liquefaction is an effective and promising approach to produce sorbitol, since the subcritical reaction media and appropriate catalysts provide a selective production of platform chemicals. In this study, sorbitol was produced from different renewable sources (cellulose and glucose) in the presence of Ru-based catalysts (Ru/SiO2, Ru/AC, Ru/SBA-15, and Ru/SBA-15-SO3) under subcritical conditions. The highest cellulose conversion was achieved as 90% in the presence of Ru/SBA-15-SO3 for 1 h of reaction duration. The highest sorbitol yield (%) by hydrothermal liquefaction …

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Study On The Alkylation Of Aromatic Hydrocarbons And Propylene, Wanglai Dong, Wentao Ma, Xinyao Li, Xingbang Hu, Zheng Zhou Jan 2022

Study On The Alkylation Of Aromatic Hydrocarbons And Propylene, Wanglai Dong, Wentao Ma, Xinyao Li, Xingbang Hu, Zheng Zhou

Turkish Journal of Chemistry

In order to improve the efficiency of the alkylation reaction to aromatic hydrocarbons and propylene, different types of catalysts were screened, including ultra-stable Y molecular sieves (USY), solid phosphoric acid (SPA), ZSM type molecular sieve (HZSM), etc. The effects of reaction temperature, catalyst loading, and reaction time on the conversion rate of aromatic hydrocarbons and the selectivity of target products were investigated using the high-pressure reaction device. The catalysts were characterized by XRD, BET, SEM, FT-IR, NH3-TPD, and other methods. The experimental results show that the USY catalyst exhibits higher catalytic activity for alkylation. This catalyst can be used for …

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Fluorometric Determination Of Ornidazole By Using Bsa Coated Copper Nanoclusters As A Novel Turn Off Sensor, Mehmetcan Bi̇lkay, Hayri̇ye Eda Şatana Kara Jan 2022

Fluorometric Determination Of Ornidazole By Using Bsa Coated Copper Nanoclusters As A Novel Turn Off Sensor, Mehmetcan Bi̇lkay, Hayri̇ye Eda Şatana Kara

Turkish Journal of Chemistry

A fluorescent probe based on bovine serum albumin stabilized copper nanoclusters (BSA-CuNCs) was developed for the selective and sensitive determination of ornidazole (ORN). The nanoclusters were synthesized via a one-pot hydrothermal process in basic media. The synthesized and characterized BSA-CuNCs have less than 3 nm particle size and exhibited blue emission at 405 nm when excited at 325 nm. Synthesized and characterized nanoclusters were successfully applied as a turn-off fluorescent probe for the determination of ORN in pharmaceutical dosage forms. The quenching mechanism created an was inner filter effect (IFE). The method was linear in the concentration range of 0.52-13.56 …

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Preparation, Assessment, And Swelling Study Of Amphiphilic Acrylic Acid/Chitosan-Based Semi-Interpenetrating Hydrogels, Mohammad Reza Jozaghkar, Amir Sepehrianazar, Farshid Ziaee, Fakhrosadat Mirtaleb Jan 2022

Preparation, Assessment, And Swelling Study Of Amphiphilic Acrylic Acid/Chitosan-Based Semi-Interpenetrating Hydrogels, Mohammad Reza Jozaghkar, Amir Sepehrianazar, Farshid Ziaee, Fakhrosadat Mirtaleb

Turkish Journal of Chemistry

The aim of this study was to synthesize amphiphilic semi-IPN hydrogels based on acrylic acid (AA) and chitosan (CS) using AIBN as an initiator and N,N?methylene bis acrylamide as a crosslinking agent. The swelling behavior of the hydrogels was evaluated at a variety of pH values, temperature, the salinity of media and time, and the swelling mechanism was investigated using Fickian diffusion and Schott's 2nd-order-kinetics models. FTIR spectroscopy was used to confirm the synthesis of AA/CS hydrogel. The swelling results showed that, in the acidic media, as the CS content increase the hydrogel swelling ratio reduces. It was found that …

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Biological Potential Of Copper Complexes: A Review, Jamshaid Ashraf, Muhammad Asad Riaz Jan 2022

Biological Potential Of Copper Complexes: A Review, Jamshaid Ashraf, Muhammad Asad Riaz

Turkish Journal of Chemistry

This review comprises the inorganic compounds particularly metal coordinated complexes, as drugs play a relevant role in medicinal chemistry. It has been observed that copper complexes are potentially attractive as medicinal importance. In this review, the most remarkable achievements of copper complexes undertaken over the past few decades as antimicrobial, antioxidant, enzyme inhibition activity, and anti-cancer agents are discussed. This work was motivated by the observation that no comprehensive surveys of the diversity of biological activities of copper complexes were available in the literature.

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Polymer Based Advanced Recipes For Imidazoles: A Review, Shivnath Patel, Rajendra Patil, Jagdish Chavan, Anil Beldar Jan 2022

Polymer Based Advanced Recipes For Imidazoles: A Review, Shivnath Patel, Rajendra Patil, Jagdish Chavan, Anil Beldar

Turkish Journal of Chemistry

Imidazoles and their scaffold are an extraordinarily essential class of nitrogen bearing azole heterocyclic compounds. They have different place in wide area of organic synthesis, which can be utilized in a variety of applications in diverse fields including agriculture, medicine, polymer and various industries. Numerous methods for synthesis of imidazole derivatives are reported in last few decades. Existing conventional methods are more or less significant and confined due to its time-consuming reactions, high cost of catalyst, extensive methodologies, low yield rate or no reusability respectively. Overcoming to inefficient conventional methods, finding of novel and effective methods of imidazole synthesis becomes …

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Synthesis Of A Novel Antiweathering Nanocomposite Superhydrophobic Room Temperaturevulcanized (Rtv) Silicon Rubber Enhanced With Nanosilica For Coating High Voltageinsulators, Khalid K. Abbas, Mayyadah S. Abed, Ali F. Jasim Jan 2022

Synthesis Of A Novel Antiweathering Nanocomposite Superhydrophobic Room Temperaturevulcanized (Rtv) Silicon Rubber Enhanced With Nanosilica For Coating High Voltageinsulators, Khalid K. Abbas, Mayyadah S. Abed, Ali F. Jasim

Turkish Journal of Chemistry

A new nanocomposite superhydrophobic of the RTV (room temperature vulcanized) silicon rubber reinforced with a different percentage of nanosilica was prepared by a two-stage sol-gel route to obtain a superhydrophobic surface coating on high voltage glass insulator, preventing the dust-water droplet from adhering to its surface. The cold spraying technique was utilized to build up a thin nanocomposite superhydrophobic layer on the glass insulator containing different percentages of the nanosilica particles, such as 23 wt %, 33 wt %, and 44 wt % with RTV silicon substrate. The synthesized nanocomposite was analyzed using the contact angle, roughness, adhesion, hardness, and …

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An Experimental And Theoretical Analysis Of Supercritical Carbon Dioxide Extraction Of Cu(Ii) And Pb(Ii) Ions In The Form Of Dithizone Bidentate Complexes, Jeton Halili, Avni Berisha Jan 2022

An Experimental And Theoretical Analysis Of Supercritical Carbon Dioxide Extraction Of Cu(Ii) And Pb(Ii) Ions In The Form Of Dithizone Bidentate Complexes, Jeton Halili, Avni Berisha

Turkish Journal of Chemistry

For more than five decades, dithizone has been widely used as an analytical reagent. This ligand forms strongly colored complexes with metal ions and this ability to form complexes can be used for extraction/removal of certain metal ions in addition to analytical determination. In static mode, the supercritical carbon dioxide extraction of copper and lead ions from aqueous solutions after complexation by the dithizone ligand is studied (at two different conditions: a) p = 120 bar, T = 30 °C, and b) p = 72 bar, T = 50 °C). The addition of methanol improved the extraction process by modulating …

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Catalytic Activity Of Ethylbenzene With Product Selectivity By Gold Nanoparticlessupported On Zinc Oxide, Afiq Anwar, Azman Ma'amor, H.N.M. Ekramul Mahmud, Wan Jefrey Basirun, Iskandar Abdullah Jan 2022

Catalytic Activity Of Ethylbenzene With Product Selectivity By Gold Nanoparticlessupported On Zinc Oxide, Afiq Anwar, Azman Ma'amor, H.N.M. Ekramul Mahmud, Wan Jefrey Basirun, Iskandar Abdullah

Turkish Journal of Chemistry

The oxidation of ethylbenzene (EB) using tert-butyl hydroperoxide as the oxidizing agent was carried out in presence of gold nanoparticles (3 nm) supported on zinc oxide in acetonitrile solution. A higher selectivity towards acetophenone (ACP) as the major product, and a moderate selectivity towards other products such as 1-phenylethanol (PE), benzaldehyde (BZL), and benzoic acid (BzA) were observed using the prepared Au/ZnO nanocatalysts at 100 °C for 24 h. It is suggested the reaction produces an intermediate product, which is dimethylethyl-1-phenylethyl peroxide through a radical mechanism. A small amount of benzaldehyde was observed because benzaldehyde went autoxidation to form benzoic …

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Synthesis Of Some New Isoxazole Compounds And Their Biological Tyrosinase And Antioxidant Activities, Seda Fandakli Jan 2022

Synthesis Of Some New Isoxazole Compounds And Their Biological Tyrosinase And Antioxidant Activities, Seda Fandakli

Turkish Journal of Chemistry

In this study, 7 new isoxazole compounds (8-14) were synthesized from the cyclization of chalcone compounds (1-7) containing different functional groups with hydroxylamine hydrochloride in alkaline medium. Tyrosinase and antioxidant properties of 8-14 were investigated. IC50 values for the tyrosinase enzyme inhibition of compounds 8, 11, 12, and 13 were varied between 61.47 ± 3.46 and 188.52 ± 5.85, while compounds 9, 10 and 14 did not show any inhibition effect. The antioxidant properties of 8-14 were investigated by DPPH and CUPRAC methods. Compound 12 showed the best DPPH radical scavenging activity (SC50: 40.21 ± 2.71), while 12 and 13 …

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Removal Of Cd2+ Metal Ions From Aqueous Solutions By Na-Alginate-Containingcomposite Biosorbent, Ramazan Donat Jan 2022

Removal Of Cd2+ Metal Ions From Aqueous Solutions By Na-Alginate-Containingcomposite Biosorbent, Ramazan Donat

Turkish Journal of Chemistry

This research is related to the effect of alginate-containing composite biosorbent on the sorption capacity of heavy metal Cd2+ ions. The study aims to determine the character and optimization of the sorption of Na-alginate-containing composite biosorbent on the sorption of heavy metal Cd2+ metal ions in an aqueous solution. Optimum conditions of parameters such as biosorbent amount, pH value effect, concentration effect, contact time, and temperature that affect the sorption of Cd2+ ions were determined. Langmuir, Freundlich, D-R isotherms were applied to the obtained data, and it was noted that the sorption Cd2+ ions are better explained with Freundlich and …

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Synthesis And In Vitro Α-Glucosidase And Cholinesterases Inhibitory Actions Of Watersolublemetallophthalocyanines Bearing ({6-[3-(Diethylamino)Phenoxy]Hexyl}Oxy Groups, Turgut Keleş, Zekeri̇ya Biyiklioğlu, Di̇dem Akkaya, Arzu Özel, Burak Barut Jan 2022

Synthesis And In Vitro Α-Glucosidase And Cholinesterases Inhibitory Actions Of Watersolublemetallophthalocyanines Bearing ({6-[3-(Diethylamino)Phenoxy]Hexyl}Oxy Groups, Turgut Keleş, Zekeri̇ya Biyiklioğlu, Di̇dem Akkaya, Arzu Özel, Burak Barut

Turkish Journal of Chemistry

In this paper, we have prepared peripherally tetra-({6-[3-(diethylamino)phenoxy]hexyl}oxy substituted cobalt(II), copper(II), manganese(III) phthalocyanines (3, 4, 5) and their water-soluble derivatives (3a, 4a, 5a). Then, in vitro α-glucosidase and cholinesterases inhibitory actions of the water-soluble 3a, 4a, 5a were examined using spectrophotometric methods. 4a had the highest inhibitory effects among the tested compounds against α-glucosidase due to IC50 values. 4a and 5a had 40 fold higher inhibitory effects than the positive control. For cholinesterases, the compounds showed significant inhibitory actions that of galantamine which was used as a positive control. According to the SI value, 3a inhibited acetylcholinesterase enzyme selectively. In …

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Induction Of Lutein Production In Scenedesmus Obliquusunder Different Culture Conditions Prior To Its Semipreparative Isolation, Ayşegül Erdoğan, Ayça Büşra Karataş, Zeli̇ha Demi̇rel, Meltem Dalay Jan 2022

Induction Of Lutein Production In Scenedesmus Obliquusunder Different Culture Conditions Prior To Its Semipreparative Isolation, Ayşegül Erdoğan, Ayça Büşra Karataş, Zeli̇ha Demi̇rel, Meltem Dalay

Turkish Journal of Chemistry

Microalgae with their improved growth rates and accumulation of high-value-added products make their commercial production attractive. Among them, lutein, which is a carotenoid, plays a very important role due to its various applications in the food and pharmaceutical industry. Induction of its biosynthesis can be triggered by various stress conditions like light. In this study, three different light intensities (50,150 and 300 μmol photons/m2s) and aeration rates (1, 3, and 5 L/min) were utilized to induce the lutein biosynthesis and biomass productivity in Scenedesmus obliquus. Lutein was isolated by preparative chromatography using a semiprep C30 column (10 × 250 mm, …

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A New Study Of Dynamic Mechanical Analysis And The Microstructure Of Polyurethanefoams Filled, Noureddine Boumdouha, Zitouni Safidine, Achraf Boudiaf Jan 2022

A New Study Of Dynamic Mechanical Analysis And The Microstructure Of Polyurethanefoams Filled, Noureddine Boumdouha, Zitouni Safidine, Achraf Boudiaf

Turkish Journal of Chemistry

Polyurethane foams have good shock-absorbing properties. This article discusses the study of the physical, dynamic analysis, and microstructure of filled polyurethane foams (PUR). We used mineral fillings nanoparticles of titanium dioxide (TiO2) and calcium carbonate (C1) to support and strengthen the foam cell structure to develop shock absorption and thermal resistance properties. Dynamic mechanical analysis (DMA) and compression tests compared the mechanic characterization results with different modelling approaches. For studies of physicochemical properties, we used differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). We deduced the flame retardancy mechanism. It appears that a detailed description of the characteristics of viscosity …

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Design, Synthesis, And In Vitro Antitumor Activity Of 6-Aryloxyl Substituted Quinazolinederivatives, Meixia Fan, Lei Yao Jan 2022

Design, Synthesis, And In Vitro Antitumor Activity Of 6-Aryloxyl Substituted Quinazolinederivatives, Meixia Fan, Lei Yao

Turkish Journal of Chemistry

Quinazoline derivatives are a class of important antitumor drugs known as small molecule inhibitors that include epidermal growth factor receptor (EGFR) inhibitors. Based on the structure of poziotinib, a series of 6-aryloxyl substituted quinazoline derivatives were designed and synthesized. The in vitro antitumor activities of the compounds were evaluated by the 3-(4,5-dimethyl-thiazol-2- yl)2,5-diphenyltetrazolium bromide (MTT) method using the human gastric cancer N87 (HER2), nonsmall-cell lung cancer H1975 (EGFRT790M/L858R), and A549 (EGFRWT) cell lines. The most promising compound 4m exhibited potent antitumoral activities with IC50 values of 6.3 nM and 7.5 nM for N87 and H1975 cell lines, respectively. Meanwhile, it …

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Electroanalytical Investigation And Voltammetric Quantification Of Antiviral Drug Favipiravir In The Pharmaceutical Formulation And Urine Sample Using A Glassy Carbon Electrode In Anionic Surfactant Media, Zeynep Akca, Hande İzem Özok, Yavuz Yardim, Zühre Şentürk Jan 2022

Electroanalytical Investigation And Voltammetric Quantification Of Antiviral Drug Favipiravir In The Pharmaceutical Formulation And Urine Sample Using A Glassy Carbon Electrode In Anionic Surfactant Media, Zeynep Akca, Hande İzem Özok, Yavuz Yardim, Zühre Şentürk

Turkish Journal of Chemistry

This work describes the electrochemical investigation of a promising antiviral agent, favipiravir (FAV) utilizing a nonmodified glassy carbon (GC) electrode, along with a unique voltammetric approach that can determine FAV with a good degree of accuracy, speed, and cost-effectiveness. Using cyclic voltammetry, the compound demonstrated a single well-defined and an irreversible oxidation peak at approximately +1.12 V (vs. Ag/AgCl) in Britton-Robinson (BR) buffer at pH 10.0. The synergistic effect of anionic surfactant, sodium dodecyl sulfate (SDS) on the adsorption ability of GC electrode remarkably increased the sensitivity of the stripping voltammetric measurements of FAV. Employing square-wave adsorptive stripping voltammetry at …

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Parametric And Kinetic Study Of Solvent-Free Synthesis Of Solketal Using Ion Exchange Resin, Dheer A. Rambhia, Sravanthi Veluturla, Archna Narula Jan 2022

Parametric And Kinetic Study Of Solvent-Free Synthesis Of Solketal Using Ion Exchange Resin, Dheer A. Rambhia, Sravanthi Veluturla, Archna Narula

Turkish Journal of Chemistry

The ketalization reaction of glycerol with acetone for solketal formation was performed using a gel-type ion exchange resin, Indion 225H in a solvent-free medium. The experimental parameters molar ratio, catalyst loading, rate of stirring, and temperature were analyzed and evaluated for their impact on the conversion of glycerol. A kinetic model based on the Langmuir-Hinshelwood?Hougen- Watson (LHHW) equation described the kinetics of the heterogeneous system. The parameters were evaluated using the ode45 solver and Genetic Algorithm (GA) optimization function on MATLAB software. The activation energy for the ketalization of glycerol was found to be 39.3 kJ/mol, the enthalpy of adsorption …

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Synthesis, Antioxidant Activity, Molecular Docking And Adme Studies Of Novel Pyrrolebenzimidazolederivatives, Fi̇kri̇ye Zengi̇n Karadayi, Rahman Başaran, Mehmet Murat Kişla, Bi̇nay Eke, Zeynep Alagöz Jan 2022

Synthesis, Antioxidant Activity, Molecular Docking And Adme Studies Of Novel Pyrrolebenzimidazolederivatives, Fi̇kri̇ye Zengi̇n Karadayi, Rahman Başaran, Mehmet Murat Kişla, Bi̇nay Eke, Zeynep Alagöz

Turkish Journal of Chemistry

Several 5-(alkylsulfonyl)-1-substituted-2-(1H-pyrrol-2-yl)-1H-benzo[d]imidazole derivatives were synthesized and their antioxidant activities were investigated using lipid peroxidation (LPO) and 7-ethoxyresorufin O-deethylase (EROD) assays. Docking analysis with Human NAD[P]H-Quinone oxidoreductase 1 (NQO1) was also performed to gather thorough information about these compounds that have antioxidant activities. Moreover, their molecular descriptors and ADME properties were calculated using the SwissADME online program. As a result, most of our compounds possessed better affinity and created ample interactions with NQO1. The most potent compound 5j had LP inhibition value of 3.73 nmol/mg/min. Other compounds exhibited moderate activity on LP levels comparing to standard butylated hydroxy toluene (BHT). However, …

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Microstructure And Ionic Conductivity Investigation Of Samarium Doped Ceria(Sm0.2ce0.8o1.9) Electrolytes Prepared By The Templating Methods, Di̇lara Güçtaş, Vedat Sariboğa, Mehmet Ali̇ Faruk Öksüzömer Jan 2022

Microstructure And Ionic Conductivity Investigation Of Samarium Doped Ceria(Sm0.2ce0.8o1.9) Electrolytes Prepared By The Templating Methods, Di̇lara Güçtaş, Vedat Sariboğa, Mehmet Ali̇ Faruk Öksüzömer

Turkish Journal of Chemistry

Sm0.2Ce0.8O1.9 (SDC20) electrolytes were synthesized with cellulose templating (CT) and PVA templating (PVAT) methods. Powder characteristics were examined using TG/DTA, XRD, and SEM. Pellets are sintered at various temperatures for different durations. Mean grain sizes were calculated from SEM micrographs using the linear intercept method. Grain growth behavior of the electrolytes was investigated and the dominant diffusion mechanism was examined. The grain growth activation energies were obtained for the first time for the mentioned electrolytes prepared by the mentioned methods. The ionic conductivities were calculated by electrochemical impedance spectroscopy. The highest ionic conductivity value was found to be 0.050 S …

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Boric Acid And Schiff Base-Based Fluorescent Sensor For Detection Of L-Tryptophan In Milk And Bsa Samples, Ümran Duru Kamaci, Musa Kamaci Jan 2022

Boric Acid And Schiff Base-Based Fluorescent Sensor For Detection Of L-Tryptophan In Milk And Bsa Samples, Ümran Duru Kamaci, Musa Kamaci

Turkish Journal of Chemistry

In the present paper, the fluorescence sensor based on Schiff base and boric acid was developed for easy and rapid detection of L-tryptophan in different samples such as milk and bovine serum albumin. The photoluminescence intensity was measured by using fluorescent measurements and the results indicated that the developed fluorescent sensor was exhibited selective, sensitive, reliable determination against L-tryptophan, and a series of various analytes such as cations, amino acids, and organic compounds were used to investigate the selectivity of the fluorescent chemosensor. The limit of detection and linear range of the chemosensor were calculated as 0.82 μM, and 0.1?500 …

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Investigation Of Boron Nanosized Particles Prepared With Various Surfactants And Chitosan In Terms Of Physical Stability And Cell Viability, Emrah Özakar, Mehmet Semi̇h Bi̇ngöl, Ruki̇ye Sevi̇nç Özakar Jan 2022

Investigation Of Boron Nanosized Particles Prepared With Various Surfactants And Chitosan In Terms Of Physical Stability And Cell Viability, Emrah Özakar, Mehmet Semi̇h Bi̇ngöl, Ruki̇ye Sevi̇nç Özakar

Turkish Journal of Chemistry

Nanosuspensions (NS) are one of the new generation drug carrier forms developed to overcome the deficiencies of drugs with poor water solubility or insolubility and are considered to be one of the most successful approaches to formulate compounds in recent years. Boron nitride (BN) is insoluble in water and chemically more stable than carbon, it offers better biological superiority although the application of carbon structures in the biomedical field has increased in recent years. Chitosan is a polymer with excellent processability and biocompatibility thanks to its high dielectric constant. In addition, chitosan has a high affinity for metal ions. This …

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Synthesis And Antioxidant Activities Of Benzylic Bromophenols Inclusive Of Natural Products, Çeti̇n Bayrak, Eda Mehtap Üç, Mohsen Rezaei, İlhami̇ Gülçi̇n, Abdullah Menzek Jan 2022

Synthesis And Antioxidant Activities Of Benzylic Bromophenols Inclusive Of Natural Products, Çeti̇n Bayrak, Eda Mehtap Üç, Mohsen Rezaei, İlhami̇ Gülçi̇n, Abdullah Menzek

Turkish Journal of Chemistry

The synthesis of natural products 2-(2,3-dibromo-4,5-dihydroxyphenyl)acetic acid (1) and 2-(2,6-dibromo-3,5-dihydroxyphenyl)acetic acid (2) and as well as their derivatives 25 and 26 were carried out by substitution, hydrolysis and demethylation reactions of the corresponding four benzyl bromides. The antioxidant potentials of benzylic acid-derived bromophenols were, for the first time, appraised by several outstanding bioanalytical methods. Besides these, we estimated the antioxidant effects which were studied using the methods of DPPH·, ABTS·+ scavenging activities, ferric (Fe3+) and cupric (Cu2+) ions and Fe3+-TPTZ reducing capacities. Benzylic acid-derived bromophenols were found as effective DPPH·, and …

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Synthesis Of Titanium Dioxide Nanoparticles With Renewable Resources And Their Applications: Review, Umut Şafak Öztürk, Ali̇me Çitak Jan 2022

Synthesis Of Titanium Dioxide Nanoparticles With Renewable Resources And Their Applications: Review, Umut Şafak Öztürk, Ali̇me Çitak

Turkish Journal of Chemistry

Metal-oxide nanoparticles have reached a wide range of applications in the last ten years. Titanium dioxide nanoparticles stand out with their unique crystal structure and near-perfect physical and chemical properties at nanoscales (crystal size between 10-100 nm). It has created many applications with its white pigment, semiconductor state, and effective photocatalytic properties, but the synthesis of these nanoparticles is very damaging to nature. Titanium dioxide nanoparticles, which can be synthesized with toxic solvents or high-energy machines, have started to be synthesized by the green synthesis method, which has been a cheap and easy method in recent years. The application areas …

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A Review On The Achievement Of Enzymatic Glycerol Carbonate Production, Selda Aydoğdu, Nurcan Kapucu Jan 2022

A Review On The Achievement Of Enzymatic Glycerol Carbonate Production, Selda Aydoğdu, Nurcan Kapucu

Turkish Journal of Chemistry

High energy demand driven by decreasing fossil fuels, and global warming because of the burning of fossil fuels necessitates the utilization of renewable and clean energy. One of these renewable energy sources is biodiesel. The increasing trend of biodiesel over the last 20 years tends to result in increasing glycerol (Gly), which is produced during the biodiesel production in 10% ratio (w/w) as a by-product. Using Gly as raw material is an alternative way to produce bio-based new products such as glycerol carbonate (GlyC). GlyC is a value-added product of Gly/vegetable oil and this product can be used as a …

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Homonuclear Nickel(Ii) Metal-Organic Framework-Type Supramolecule: Adsorption And Emission Properties, Idongesit Mbonu, Olusegun Abiola, Hamzah Bawa Jan 2022

Homonuclear Nickel(Ii) Metal-Organic Framework-Type Supramolecule: Adsorption And Emission Properties, Idongesit Mbonu, Olusegun Abiola, Hamzah Bawa

Turkish Journal of Chemistry

Coordination-driven self-assembly of nickel (II) ions with equimolar amounts of 1, 10 phenanthroline, and benzoic acid was used to create homonuclear nickel (II) MOF-type supramolecule. Single crystal X-ray diffraction, scanning electron microscopy, differential scanning calorimetry, photoluminescence measurement, FT-IR, UV-visible spectroscopy, and nitrogen physisorption measurement were used to characterize the compound. The single crystal X-ray diffraction study reveals that the synthesized compound is two-dimensional with pores in the structure. The homonuclear nickel (II) MOF-type supramolecule crystallized in a triclinic crystal system, with space group P-1 (No.2) and unit cell parameters a = 9.2053(4) Ǻ, b = 13.2964(5) Ǻ, c = 15.8998(6) …

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The 4-(Dimethylaminoalkyl)Piperazine Inhibitors Of Α-Glucosidase: Allosteric Enzyme Inhibition And Identification Of Interacting Chemical Groups, Usman Ghani, Sajda Ashraf, Zaheer Ul Haq, Zafer Asim Kaplancikli, Fati̇h Demi̇rci̇, Yusuf Özkay, Sibtain Afzal Jan 2022

The 4-(Dimethylaminoalkyl)Piperazine Inhibitors Of Α-Glucosidase: Allosteric Enzyme Inhibition And Identification Of Interacting Chemical Groups, Usman Ghani, Sajda Ashraf, Zaheer Ul Haq, Zafer Asim Kaplancikli, Fati̇h Demi̇rci̇, Yusuf Özkay, Sibtain Afzal

Turkish Journal of Chemistry

In continuation of our interest in identifying new α-glucosidase inhibitors with potential to become antidiabetic drugs, this work focuses on the study of 4-(dimethylaminoalkyl)piperazine-1-carbodithioate derivatives as α-glucosidase inhibitors. The eight heterocyclic piperazine-dithiocarbamate complexes studied in this work contain a variety of substitutions on their benzene ring exhibiting potent, noncompetitive inhibition of α-glucosidase. Dithiocarbamate and piperazine moieties are important pharmacophores with promising therapeutic prospects featuring facilitated drug delivery due to their lipophilic nature in addition to their α-glucosidase inhibitory activity. Enzyme kinetics, molecular dynamics simulations, and docking studies revealed that the target compounds bind to a new allosteric site that is …

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High-Efficiency Removal Of Cationic Dye And Heavy Metal Ions From Aqueous Solution Using Amino-Functionalized Graphene Oxide, Adsorption Isotherms, Kinetics Studies, And Mechanism, Meti̇n Çelebi̇, Eda Gökirmak Söğüt Jan 2022

High-Efficiency Removal Of Cationic Dye And Heavy Metal Ions From Aqueous Solution Using Amino-Functionalized Graphene Oxide, Adsorption Isotherms, Kinetics Studies, And Mechanism, Meti̇n Çelebi̇, Eda Gökirmak Söğüt

Turkish Journal of Chemistry

GO-NH2 (amino functionalized graphene oxide) was synthesized by grafting (3-aminopropyl) triethoxysilane onto the surface GO (graphene oxide). The GO-NH2 with a higher surface area and many active sites was characterized and its effectiveness in removing Rhod B dye and Ni(II) ions from wastewater by adsorption was observed. The effects of pH, time, and strange ions on the adsorption efficiency were investigated. The equilibrium isotherm data confirmed that it fits the Langmuir and Freundlich isotherm models. GO and GO-NH2 exhibited high adsorption capacity (QM); 2500 (mg L-1) and 3333 (mg L-1) for …

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