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Articles 9451 - 9480 of 33221

Full-Text Articles in Chemistry

Design Of An Amphiphilic Hyperbranched Core/Shell-Type Polymeric Nanocarrier Platform For Drug Delivery, Ayça Bal Öztürk, Nesri̇n Oğuz, Hande Tekarslan Şahi̇n, Serkan Emi̇k, Emi̇ne Alarçi̇n Jan 2020

Design Of An Amphiphilic Hyperbranched Core/Shell-Type Polymeric Nanocarrier Platform For Drug Delivery, Ayça Bal Öztürk, Nesri̇n Oğuz, Hande Tekarslan Şahi̇n, Serkan Emi̇k, Emi̇ne Alarçi̇n

Turkish Journal of Chemistry

An amphiphilic core/shell-type polymer-based drug carrier system (HPAE- PCL-b-MPEG), composed of hyperbranched poly(aminoester)-based polymer (HPAE) as the core building block and poly(ethylene glycol)-bpoly(ε-caprolactone) diblock polymers (MPEG-b-PCL) as the shell building block, was designed. The synthesized polymers were characterized with FTIR, $^{1}$H NMR, $^{13}$C NMR, and GPC analysis. Monodisperse HPAE-PCL-bMPEG nanoparticles with dimensions of

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Arene Diazonium Saccharin Intermediates: A Greener And Cost-Effective Alternative Method For The Preparation Of Aryl Iodide, Lia Zaharani, Nader Ghaffari Khaligh, Zohreh Shahnavaz, Mohd Rafie Johan Jan 2020

Arene Diazonium Saccharin Intermediates: A Greener And Cost-Effective Alternative Method For The Preparation Of Aryl Iodide, Lia Zaharani, Nader Ghaffari Khaligh, Zohreh Shahnavaz, Mohd Rafie Johan

Turkish Journal of Chemistry

In the current protocol, the arene diazonium saccharin derivatives were initially produced from various substituted aromatic amines; subsequently, these intermediates were treated with a greener organic iodide for the preparation of the aryl iodide. We tried to choose low-cost, commercially available, biodegradable, recoverable, ecofriendly, and safe reagents and solvents. The arene diazonium saccharin intermediates could be stored in the liquid phase into a refrigerator for a long time with no significant loss activity. The outstanding merits of the current protocol (a) included the partial recovering of saccharin and tetraethylammonium salt, (b) reduce the use of solvents and the reaction steps …

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Combined Ligand And Structure-Based Virtual Screening Approaches For Identification Of Novel Ache Inhibitors, Kader Şahi̇n, Serdar Durdaği Jan 2020

Combined Ligand And Structure-Based Virtual Screening Approaches For Identification Of Novel Ache Inhibitors, Kader Şahi̇n, Serdar Durdaği

Turkish Journal of Chemistry

The excessive activity of acetylcholinesterase enzyme (AChE) causes different neuronal problems, especially dementia and neuronal cell deaths. Food and Drug Administration (FDA) approved drugs donepezil, rivastigmine, tacrine and galantamine are AChE inhibitors and in the treatment of Alzheimer's disease (AD) these drugs are currently prescribed. However, these inhibitors have various adverse side effects. Therefore, there is a great need for the novel selective AChE inhibitors with fewer adverse side effects for the effective treatment. In this study, combined ligand-based and structure-based virtual screening approaches were used to identify new hit compounds from small molecules library of National Cancer Institute (NCI) …

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Effect Of Polyelectrolyte Complex Formation On The Antibacterial Activity Of Copolymer Of Alkylated 4-Vinylpyridine, Murat Topuzoğullari Jan 2020

Effect Of Polyelectrolyte Complex Formation On The Antibacterial Activity Of Copolymer Of Alkylated 4-Vinylpyridine, Murat Topuzoğullari

Turkish Journal of Chemistry

Polymers bearing quaternized 4-vinylpyridine (QVP) groups are known for their antibacterial activities and these polymers can form polyelectrolyte complexes (PEC) with polyanions through electrostatic interactions. PEC formation can be used to adjust the antibacterial activity of polymers of QVP, deliver active molecules, or design antibacterial supramolecular structures. However, the antibacterial activity of PECs of QVP polymers has not been investigated. In this study, a copolymer of QVP was mixed with polyacrylic acid in various molar ratios of components to form PECs. Hydrodynamic diameters and zeta potentials of formed PECs were determined by dynamic and electrophoretic light scattering spectroscopy techniques. The …

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Hosphorus-Nitrogen Compounds (Part 51): The Relationship Between Spectroscopic And Crystallographic Data Of Mono- And Di-Spirocyclophosphazene Derivatives With 4-Fluoro/Nitrophenylmethyl Pendant Arm/Arms, Aytuğ Okumuş, Gamze Elmas, Nuran Asmafi̇li̇z, Selen Bi̇lge Koçak, Zeynel Kiliç Jan 2020

Hosphorus-Nitrogen Compounds (Part 51): The Relationship Between Spectroscopic And Crystallographic Data Of Mono- And Di-Spirocyclophosphazene Derivatives With 4-Fluoro/Nitrophenylmethyl Pendant Arm/Arms, Aytuğ Okumuş, Gamze Elmas, Nuran Asmafi̇li̇z, Selen Bi̇lge Koçak, Zeynel Kiliç

Turkish Journal of Chemistry

A great wealth of structural information about phosphazenes can be gleaned from the combined spectroscopic and crystallographic data. When data from $^{31}$P NMR spectroscopy and X-ray crystallography are put together like pieces in a puzzle, a number of correlations can be obtained for phosphazene derivatives. A systematic study concerning the correlations among the structural parameters (e.g., $^{31}$P NMR data, endocyclic/exocyclic NPN bond angles and bond lengths) revealed some characteristics of mono- and di-spirocyclophosphazene derivatives bearing~4-fluoro/nitrophenylmethyl pendant arm/arms. These correlations include the relationship between the $\delta $P$_{spiro}$ shifts, the values of electron density transfer parameters $\Delta $(P--N), and the endocyclic and …

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Phosphorus-Nitrogen Compounds- (Part 50): Correlations Between Structural Parameters For Cylophosphazene Derivatives Containing Ferrocenyl Pendant Arm(S), Nuran Asmafi̇li̇z, Gamze Elmas, Aytuğ Okumuş, Selen Bi̇lge Koçak, Zeynel Kiliç Jan 2020

Phosphorus-Nitrogen Compounds- (Part 50): Correlations Between Structural Parameters For Cylophosphazene Derivatives Containing Ferrocenyl Pendant Arm(S), Nuran Asmafi̇li̇z, Gamze Elmas, Aytuğ Okumuş, Selen Bi̇lge Koçak, Zeynel Kiliç

Turkish Journal of Chemistry

The results of a systematic study of spiro-cyclotri/tetraphosphazenes with ferrocenyl pendant arm on the basis of correlation between structural parameters were presented. The main parameters were obtained from Xray crystallography and 31 P NMR results in order to investigate the relationship between the δ P$_{spiro}$ shift values and endocyclic and exocyclic NPN bond angles, and electron density transfer parameters. Structural parameters derived from 11 types of the ferrocenyl cyclophosphazene derivatives with 5- to 7-membered spiro-rings introduced to the literature from our research group were studied and compared with each other.

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Development And Validation Of An Hplc Method For Determination Of Rofecoxib In Bovine Serum Albumin Microspheres, Esra Demi̇rtürk, Emi̇rhan Nemutlu, Selma Şahi̇n, Levent Öner Jan 2020

Development And Validation Of An Hplc Method For Determination Of Rofecoxib In Bovine Serum Albumin Microspheres, Esra Demi̇rtürk, Emi̇rhan Nemutlu, Selma Şahi̇n, Levent Öner

Turkish Journal of Chemistry

A simple and reliable HPLC method was developed and validated for determination of rofecoxib in bovine serum albumin microsphere. The analyses were performed on a C18 column (150 x 4.6 mm, 5 μm particle size) at room temperature with UV detection at 272 nm. The mobile phase was composed of acetonitrile-0.1% o-phosphoric acid solution in water (1:1, v/v) mixture, and flow rate was set to 1 mL/min. The method was validated according to the international guidelines with respect to stability, linearity range, limit of quantitation and detection, precision, accuracy, specificity, and robustness. The detection and quantification limit of the method …

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Syntheses And Antibacterial Activities Of 4 Linear Nonphenolic Diarylheptanoids, Şemsi̇ Betül Demi̇r, Hati̇ce Seçi̇nti̇, Nesli̇han Çelebi̇oğlu, Murat Özdal, Alev Sezen, Özlem Gülmez, Ömer Faruk Algur, Hasan Seçen Jan 2020

Syntheses And Antibacterial Activities Of 4 Linear Nonphenolic Diarylheptanoids, Şemsi̇ Betül Demi̇r, Hati̇ce Seçi̇nti̇, Nesli̇han Çelebi̇oğlu, Murat Özdal, Alev Sezen, Özlem Gülmez, Ömer Faruk Algur, Hasan Seçen

Turkish Journal of Chemistry

Four linear nonphenolic diarylheptanoids were synthesized and their antibacterial activities were studied. ($S)$-2-Me-CBS-catalysed reduction of alnustone with BH$_{3}$.SMe$_{2}$ gave ($R)$(-)(4$E$,6$E)$-1,7-diphenylhepta-4,6-dien-3-ol, a natural product. Reduction of alnustone with Na in t-BuOH at -15 $^{\circ}$C under NH$_{3}$ atm gave ($E)$-1,7-diphenylhept-5-en-3-one as a Birch-type reduction product. $t$-BuOK catalysed condensation of benzalacetone with propionyl chloride gave (4$Z$,6$E)$-5-hydroxy-1,7-diphenylhepta-4,6-dien-3-one, a natural product. (1$E$,4$Z$,6$E)$-5-Hydroxy-4-phenethyl-1,7-diphenylhepta-1,4,6-trien-3-one, a curcuminoid, was synthesized starting from pentan-2,4-dione in 3 steps. The synthesized chemical compounds were applied against 2 gram-positive bacteria (Bacillus cereus and Arthrobacter agilis), 4 gram-negative bacteria (Pseudomonas aeruginosa, Xanthomonas campestris, Klebsiella oxytoca and Helicobacter pylori), and 1 yeast (Candida albicans) by …

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Analysis Of Electrochemical Impedance Spectroscopy Response For Commercial Lithium-Ion Batteries: Modeling Of Equivalent Circuit Elements, Uğur Morali, Sali̇m Erol Jan 2020

Analysis Of Electrochemical Impedance Spectroscopy Response For Commercial Lithium-Ion Batteries: Modeling Of Equivalent Circuit Elements, Uğur Morali, Sali̇m Erol

Turkish Journal of Chemistry

Electrochemical impedance spectroscopy measurements were performed to capture the physically meaningful parameters of commercially available 18650 cylindrical and 2032 coin cells by using the equivalent circuit model. The impedance response of the batteries was systematically investigated and discussed. A detailed analysis was achieved providing a determination of influential factors on the equivalent circuit parameters. The results suggested that the cell type tested here influenced the equivalent circuit elements profoundly. Taguchi analysis indicated that state-of-charge had the highest effect on the cathodic constant-phase-element exponent. The results contribute to full electrochemical analysis that is required for battery characterization.

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Extraction Of Heavy Metal Complexes From A Biofilm Colony For Biomonitoring The Pollution, Sedat Sürdem, Haci Mehmet Doğan Jan 2020

Extraction Of Heavy Metal Complexes From A Biofilm Colony For Biomonitoring The Pollution, Sedat Sürdem, Haci Mehmet Doğan

Turkish Journal of Chemistry

An extraction method was tested for biomonitoring the biofilm samples containing heavy metals. The fractionation of metal complexes was performed via C-18-HPLC-ICP-MS and MALDI-MS, respectively. The extraction power of some reagents was determined for the heavy metal extraction from biofilm samples collected in Erdemli coast in the Mediterranean Sea. The ammonium acetate solution giving the highest extraction results was found as a suitable extraction reagent. The concentration and pH of the ammonium acetate solution were optimized and found as 1 M and 5, respectively. The chromatograms of metal complexes with the C-18-HPLC-ICP-MS system were taken to determine the effect of …

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A Novel Fluorimetric Method For Determination Of Pseudoephedrine Hydrochloridein Pharmaceutical Formulations And Blood Serum, Nazli Farajzadeh, Nasrin Ranjbar Nader Jan 2020

A Novel Fluorimetric Method For Determination Of Pseudoephedrine Hydrochloridein Pharmaceutical Formulations And Blood Serum, Nazli Farajzadeh, Nasrin Ranjbar Nader

Turkish Journal of Chemistry

An inexpensive, simple, highly sensitive, and rapid fluorimetric method was developed for the analysis of pseudoephedrine hydrochloride at trace levels. The method is based on the recovery of fluorescence of Rh6G dye due to the interaction of pseudoephedrine hydrochloride with Rh6G-Au NPs complex, which results in the release of Rh6G from the complex and halting fluorescence resonance energy transfer between Rh6G and Au NPs. The intensity of fluorescence was directly proportional to the concentration of the analyte, which was used for its determination. Experimental factors were optimized by response-surface methodology. Under optimum conditions, the calibration curve was linear over the …

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Synthesis And Effect Of Substituent Position, Metal Type On The Electrochemical Properties Of (3-Morpholin-4-Ylpropoxy) Groups Substituted Cobalt, Manganese Phthalocyanines, Zekeri̇ya Biyiklioğlu, Hüseyi̇n Baş Jan 2020

Synthesis And Effect Of Substituent Position, Metal Type On The Electrochemical Properties Of (3-Morpholin-4-Ylpropoxy) Groups Substituted Cobalt, Manganese Phthalocyanines, Zekeri̇ya Biyiklioğlu, Hüseyi̇n Baş

Turkish Journal of Chemistry

In this work, 4-(3-morpholin-4-ylpropoxy)phthalonitrile 2, 3-(3-morpholin-4-ylpropoxy)phthalonitrile 3, Co(II)Pc and Mn(III)Pcs containing (3-morpholin-4-ylpropoxy) groups at peripheral and nonperipheral positions were synthesized. Phthalonitrile derivatives (2 and 3), Co(II)Pc and Mn(III)Pcs (2a, 2b, 3a, 3b) were characterized by using FT-IR, NMR (only for 2 and 3), mass and UV-Vis (except 2 and 3) spectral data techniques. Also, electrochemistry of (3-morpholin-4-ylpropoxy) group substituted Co(II)Pc and Mn(III)Pcs were inspected by using cyclic voltammetry. Electrochemical studies show that (3-morpholin-4-ylpropoxy) group substituted Co(II)Pc and Mn(III)Pcs electropolymerized on the Pt working electrode.

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Gas Phase Polymerization Of Ethylene Towards Uhmwpe, Gözde Geçi̇m, Ertuğrul Erkoç Jan 2020

Gas Phase Polymerization Of Ethylene Towards Uhmwpe, Gözde Geçi̇m, Ertuğrul Erkoç

Turkish Journal of Chemistry

For the first time, ultra-high molecular weight polyethylene (UHMWPE) was produced in gas phase process with a new fluidized bed concept where the solids are dispersed phase and the gas is bulk phase as opposed to conventional fluidized bed reactors (FBRs). With this concept, UHMWPE with average molecular weights about 1-6,9$\, \times \, $10$^{6}$ g moles$^{-1}$ were produced with a commercial supported Ziegler-Natta catalyst by using a gas phase mini semibatch reactor system. Additionally, optimum conditions of gas phase polymerization for the best results of productivity, catalyst activity, molecular weight and crystallinity were determined by Taguchi experimental design and catalyst …

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Mesoporous Starch Aerogels Production As Drug Delivery Matrices: Synthesis Optimization, Ibuprofen Loading, And Release Property, Akbar Mohammadi, Jafar Sadegh Moghaddas Jan 2020

Mesoporous Starch Aerogels Production As Drug Delivery Matrices: Synthesis Optimization, Ibuprofen Loading, And Release Property, Akbar Mohammadi, Jafar Sadegh Moghaddas

Turkish Journal of Chemistry

he aim of this work was to prepare biodegradable starch aerogels as drug carriers. The effective parameters in the synthesis and the optimal values of these parameters were determined using Minitab experimental design software. Ibuprofen was selected as a model drug for the dissolution study and loaded into optimized aerogel during the last solvent exchange step. The Fourier Transform Infrared Spectroscopy (FTIR) analysis showed that ibuprofen has been successfully loaded into the aerogel matrix without any effect on the aerogel nature. The drug loading was calculated to be 29%. The isotherm of ibuprofen adsorption into aerogels matrices followed from the …

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Synthesis And Liquid Crystalline Properties Of New Triazine-Based $\Pi $-Conjugated Macromolecules With Chiral Side Groups, Ni̇hat Akkurt, Mohammed Hadi Ali Al-Jumaili, Hale Ocak, Fati̇h Çakar, Lokman Torun Jan 2020

Synthesis And Liquid Crystalline Properties Of New Triazine-Based $\Pi $-Conjugated Macromolecules With Chiral Side Groups, Ni̇hat Akkurt, Mohammed Hadi Ali Al-Jumaili, Hale Ocak, Fati̇h Çakar, Lokman Torun

Turkish Journal of Chemistry

In this study, we reported the synthesis of a new tribranched macromolecule liquid crystal with triazine in the centre. The central triazine core is bonded via sequences of Sonigashira coupling to 3 triazine unites through acetylenic bridges. The triazines at the periphery are substituted with 2 chiral citronellyloxy side groups. The salt of the resulting star-shaped macromolecule, which was oily at room temperature, with 4-dodecyloxybenzoic acid at 1:1 ratio exhibited a Smectic C (SmC) mesophase. The liquid crystalline properties of organic salt were investigated using DSC (differential scanning calorimetry) and POM (polarizing optical microscopy).

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2-[(3-Aminoalkyl-(Alkaryl-,Aryl-))-1 H-1,2,4-Triazol-5-Yl]Anilines: Synthesis And Anticonvulsant Activity, Yulya Martynenko, Galina Berest, Nina Bukhtiayrova, Igor Belenichev, Oleksiy Voskoboinik, Sergiy Kovalenko Jan 2020

2-[(3-Aminoalkyl-(Alkaryl-,Aryl-))-1 H-1,2,4-Triazol-5-Yl]Anilines: Synthesis And Anticonvulsant Activity, Yulya Martynenko, Galina Berest, Nina Bukhtiayrova, Igor Belenichev, Oleksiy Voskoboinik, Sergiy Kovalenko

Turkish Journal of Chemistry

The presented work is devoted to the development of synthesis methods for novel 2-[(3-aminoalkyl-(alkaryl-, aryl-))-1$H$-1,2,4-triazolo]anilines. Abovementioned compounds were obtained via hydrazinolysis (Ing-Manske procedure) and acid hydrolysis of corresponding $N$-acylated {([1,2,4]triazolo[1,5-$c$]quinazolin-2-yl)alkyl-(alkaryl-, aryl-)} amines. The regioselectivity of hydrazinolysis and hydrolysis were established. The features of spectral characteristics were studied and discussed. Characteristic patterns of protons signals splitting in $^{1}$H NMR of the synthesized compounds were established. The effect of the synthesized compounds on the pentylenetetrazol seizures was studied. It was found that according to some indicators, anticonvulsant activity of 2-[(3-aminoalkyl-(alkaryl-, aryl-))-1$H$-1,2,4-triazolo]anilines superior or comparable with effect of the reference drug "Lamotrigine". It …

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Comparative Modelling Of A Novel Enzyme: Mus Musculus Leucine Decarboxylase, Ari̇f Sercan Şahutoğlu Jan 2020

Comparative Modelling Of A Novel Enzyme: Mus Musculus Leucine Decarboxylase, Ari̇f Sercan Şahutoğlu

Turkish Journal of Chemistry

Leucine decarboxylase (LDC) is a recently proposed enzyme with no official enzyme commission number yet. It is encoded by the Mus musculus gene Gm853 which is expressed at kidneys, generating isopentylamine, an alkylmonoamine that has not been described to be formed by any metazoan enzyme yet. Although the relevance of LDC in mammalian physiology has not been fully determined, isopentylamine is a potential modulator which may have effects on insulin secretion and healthy gut microbiota formation. The LDC is a stable enzyme that specifically decarboxylates L-leucine but does not decarboxylate ornithine or lysine as its paralogues ornithine decarboxylase (ODC; EC: …

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Colorimetric Cadmium Ion Detection In Aqueous Solutions By Newly Synthesized Schiff Bases, Zi̇ya Aydin, Mustafa Keleş Jan 2020

Colorimetric Cadmium Ion Detection In Aqueous Solutions By Newly Synthesized Schiff Bases, Zi̇ya Aydin, Mustafa Keleş

Turkish Journal of Chemistry

Two newly synthesized Schiff bases DMCA and DMBA were used for selective detection of Cd$^{2+}$ over a wide range of other metal ions in acetonitrile (ACN)/ Tris-HCl buffer (10 mM, pH 7.32, v/v 2:1). The sensors can detect Cd$^{2+}$ ions by colour changes from colourless to orange for DMBA and yellow to reddish for DMCA. Response of the probes towards metal ions was investigated by using UV-vis spectroscopy. The complex stoichiometry between the sensors, DMBA and DMCA, and Cd$^{2+}$ was found to be 2:1 and the binding constants were calculated to be 2.65 x 10$^{12}$ M$^{-2\, }$and 4.95 x 10$^{12}$ …

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Box-Behnken Design For Removal Of Uranium(Vi) From Aqueous Solution Using Poly(Ethylene Glycol) Based Dicationic Ionic Liquid Impregnated Chitosan, Süleyman İnan, Taşkin Mumcu, Serap Seyhan Bozkurt Jan 2020

Box-Behnken Design For Removal Of Uranium(Vi) From Aqueous Solution Using Poly(Ethylene Glycol) Based Dicationic Ionic Liquid Impregnated Chitosan, Süleyman İnan, Taşkin Mumcu, Serap Seyhan Bozkurt

Turkish Journal of Chemistry

Poly(ethylene glycol) bis(methylimidazolium) di[bis(trifluoromethylsulfonyl)imide] was synthesized as an ionic liquid and impregnated onto chitosan. The removal of uranium(VI) ions from aqueous solution was investigated with batch sorption tests using ionic liquid impregnated chitosan. Response surface methodology based on 3 level Box-Behnken design was applied to analyze the effect of initial pH (4-6), initial concentration (20-60 mg L$^{-1})$, contact time (15-105 min), and temperature (30-50 $^{\circ}$C C) on the uptake capacity of uranium(VI). Main effect of initial concentration, quadratic effect of contact time, and dual effect of initial pH and contact time were found statistically significant based on analysis of variance …

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Improvement Of The Adhesion Of Conductive Poly(M-Toluidine) Onto Chemically Reduced-Wool Fabrics, Meryem Kalkan Erdoğan, Meral Karakişla, Mehmet Saçak Jan 2020

Improvement Of The Adhesion Of Conductive Poly(M-Toluidine) Onto Chemically Reduced-Wool Fabrics, Meryem Kalkan Erdoğan, Meral Karakişla, Mehmet Saçak

Turkish Journal of Chemistry

Wool has disulphide bonds containing-hydrophobic external keratin layers, which act as a barrier for the modification through coating with hydrophilic materials. For that reason, in this work, to ensure a dense and homogenous conductive polymer coating onto the wool, the fabrics were subjected to the reduction process in the aqueous alkaline medium containing agents that can attack these disulphide bonds. Then, one of the polyaniline derivatives, poly($m$-toluidine) (PMT), was coated onto wool by in situ polymerization of $m$-toluidine sulphate using ammonium persulfate (APS) as an oxidant. The effects of conditions, such as the composition of reduction-bath and types of dopants …

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One-Step Synthesis Of Hierarchical [B]-Zsm-5 Using Cetyltrimethylammonium Bromide As Mesoporogen, Büşra Karakaya Yalçin, Bahar İpek Jan 2020

One-Step Synthesis Of Hierarchical [B]-Zsm-5 Using Cetyltrimethylammonium Bromide As Mesoporogen, Büşra Karakaya Yalçin, Bahar İpek

Turkish Journal of Chemistry

One-step facile synthesis of boron containing ZSM-5 microspheres is developed using 1,6-diaminohexane as the structure-directing agent and cetyltrimethylammonium bromide as the mesoporogen. High boron incorporation up to Si/B ratio of 38 is achieved and evidenced by the stretching vibrations of B-O-Si at 667 cm$^{-1}$ and 917 cm$^{-1}$ using Fourier-transform infrared spectra. The morphology of the crystals resembles berry-like spheres with sizes approximately 15 μm, which is composed of aggregated nanocrystals having sizes around 450 nm, is observed using scanning electron microscopy. The textural properties, i.e. the surface areas and pore volumes are investigated using N$_{2}$ adsorption at -196 $^{\circ}$C. t-plot …

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Preparation, Characterization, And Binding Profile Of Imprinted Semi-Ipn Cryogel Composite For Aluminum, Shahnila Shah, Huma Shaikh, Najma Memon, Muhammad Igbal Bhanger, Tahira Qureshi, Humaira Khan, Adi̇l Deni̇zli̇ Jan 2020

Preparation, Characterization, And Binding Profile Of Imprinted Semi-Ipn Cryogel Composite For Aluminum, Shahnila Shah, Huma Shaikh, Najma Memon, Muhammad Igbal Bhanger, Tahira Qureshi, Humaira Khan, Adi̇l Deni̇zli̇

Turkish Journal of Chemistry

Human body is greatly exposed to aluminum due to its high abundance in the environment. This nonessential metal is a threat to the patients of chronic renal disorders, as it is easily retained in their plasma and quickly accumulates in different tissues. Thus, there is great need to remove it from the aqueous environment. In this study, Al$^{3+}$ imprinted semiinterpenetrating polymer network (semi-IPN)-based cryogel composite was prepared and applied for the purification of environmental and drinking water samples from aluminum. Poly (2-hydroxyethyl methacrylate) (pHEMA) discs were produced via cryogenic treatment and imprinted semi-IPN was introduced to the 3-(trimethoxysilyl) propyl acrylate-modified …

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The Use Of Water-Soluble Phthalocyanines As Textile Dyes In Nylon/Elastane Fabric: Fastness And Antibacterial Effectiveness, Armağan Günsel, Ayşe Usluoğlu, Ahmet Turgut Bi̇lgi̇çli̇, Büşra Tosun, Gülnur Arabaci, Meryem Ni̇lüfer Yaraşir Jan 2020

The Use Of Water-Soluble Phthalocyanines As Textile Dyes In Nylon/Elastane Fabric: Fastness And Antibacterial Effectiveness, Armağan Günsel, Ayşe Usluoğlu, Ahmet Turgut Bi̇lgi̇çli̇, Büşra Tosun, Gülnur Arabaci, Meryem Ni̇lüfer Yaraşir

Turkish Journal of Chemistry

This work reports on dyeing of nylon/elastane fabric with water-soluble phthalocyanines (1-4) bearing quinoline 5-sulfonic acid substituents on the peripheral or nonperipheral positions and determining the antibacterial efficiency of the phthalocyanine compounds and the dyed nylon/elastane fabrics. The light, washing, water, perspiration, and rubbing fastness properties of nylon/elastane fabrics dyed with phthalocyanines were also determined. The results showed that all dyed fabrics showed very good wet fastness values. The lightfastness value of the nylon/elastane fabric dyed with phthalocyanine dye (1) showed a much better value than the others. Also, the antibacterial efficiencies of the dyed nylon fabrics and the dye …

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An Anthracene Based Fluorescent Probe For The Selective And Sensitive Detection Of Chromium (Iii) Ions In An Aqueous Medium And Its Practical Application, Erman Karakuş Jan 2020

An Anthracene Based Fluorescent Probe For The Selective And Sensitive Detection Of Chromium (Iii) Ions In An Aqueous Medium And Its Practical Application, Erman Karakuş

Turkish Journal of Chemistry

An anthracene based fluorescent probe, integrated with thiophene moiety, exhibited selective and sensitive detection of chromium (III) ions over other metal ions. Its synthesis was achieved by simple mixing of two commercially available compounds, 2-aminoanthracene, and 2-thiophenecarboxaldehyde, in onestep without the needed complex purification process. The probe molecule (ANT-Th) offered exceptional features such as "turn-on" fluorescence response, low detection limit (0.4 μM), and fast response time (< 1 min) via C$=$N bond hydrolysis. Also, a simple test paper system was developed for the rapid detection of chromium (III) ions with the naked eye.

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A Review: A Comparison Of Different Adsorbents For Removal Of Cr (Vi), Cd (Ii) And Ni (Ii), Anja Pfeifer, Mojca Skerget Jan 2020

A Review: A Comparison Of Different Adsorbents For Removal Of Cr (Vi), Cd (Ii) And Ni (Ii), Anja Pfeifer, Mojca Skerget

Turkish Journal of Chemistry

A review of the studies dealing with the removal of chromium, cadmium, and nickel ions with different adsorbents published in the literature between 2014 and 2018 is given in tabular form, along with the adsorption conditions, adsorption isotherm, and kinetic models applied by the authors to model the experimental data and adsorption capacities. The review focuses on the efficiency of ion removal.

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Evaluation Of A Novel Nanocrystalline Hydroxyapatite Powder And A Solid Hydroxyapatite/Chitosan-Gelatin Bioceramic For Scaffold Preparation Used As A Bone Substitute Material, Sharmin Rahman, Kazi Hanium Maria, Mohammad Saif Ishtiaque, Arijun Nahar, Harinarayan Das, Sheikh Manjura Hoque Jan 2020

Evaluation Of A Novel Nanocrystalline Hydroxyapatite Powder And A Solid Hydroxyapatite/Chitosan-Gelatin Bioceramic For Scaffold Preparation Used As A Bone Substitute Material, Sharmin Rahman, Kazi Hanium Maria, Mohammad Saif Ishtiaque, Arijun Nahar, Harinarayan Das, Sheikh Manjura Hoque

Turkish Journal of Chemistry

Artificially fabricated hydroxyapatite (HAP) shows excellent biocompatibility with various kinds of cells and tissues which makes it an ideal candidate for a bone substitute material. In this study, hydroxyapatite nanoparticles have been prepared by using the wet chemical precipitation method using calcium nitrate tetra-hydrate [Ca(NO$_{3})_{2}$.4H$_{2}$O] and di-ammonium hydrogen phosphate [(NH$_{4})_{2}$HPO$_{4}$] as precursors. The composite scaffolds have been prepared by a freeze-drying method with hydroxyapatite, chitosan, and gelatin which form a 3D network of interconnected pores. Glutaraldehyde solution has been used in the scaffolds to crosslink the amino groups ($\vert $NH$_{2})$ of gelatin with the aldehyde groups ($\vert $CHO) of chitosan. …

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Preparation Of Rapid (Chain-Stopped) Alkyds By Incorporation Of Gum Rosin And Investigation Of Coating Properties, Cemi̇l Dizman, Eli̇f Ozman Jan 2020

Preparation Of Rapid (Chain-Stopped) Alkyds By Incorporation Of Gum Rosin And Investigation Of Coating Properties, Cemi̇l Dizman, Eli̇f Ozman

Turkish Journal of Chemistry

In this study, the synthesis, characterization, and properties of a short oil length chain--stopped(rapid) alkyd resin is investigated. Gum rosin modified alkyd resin (RA-GR) was prepared using soybean oil, phthalic anhydride, glycerin and gum rosin acid. An alkyd modified with benzoic acid (RA-BA) was also prepared for comparison. FTIR analyses and GPC measurements of the alkyds were used for characterization. Other properties such as the viscosity, acid value, and solid content of the final resins were determined. Separately, the synthesized resins were used in paint formulations without any changes in other parameters such as filler, airdrying agents, solvents, etc. Paints …

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Effects Of Composition On Catalytic Activities Of Molybdenum Doped Platinum Nanoparticles, Aslihan Sümer Jan 2020

Effects Of Composition On Catalytic Activities Of Molybdenum Doped Platinum Nanoparticles, Aslihan Sümer

Turkish Journal of Chemistry

The physical and chemical properties of bimetallic nanoparticles can be optimized by tuning the particle composition. In this study, we identified CO adsorption and dissociation energetics on five Pt-Mo nanoparticles at different concentrations, the lowest energy Pt$_{7}$, Pt$_{6}$Mo, Pt$_{5}$Mo$_{2}$, Pt$_{4}$Mo$_{3}$, and Mo$_{7}$ clusters. We have shown that the CO adsorption and dissociation energies and preferred CO adsorption sites are largely dependent on the composition of the nanoparticles. As the Mo concentration increases, the strength of the C-O internal bond in the adsorption complex decreases, as indicated by a decrease in the C-O stretching frequency. Also, more Mo sites in the …

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Oxidation Of Crotyl Alcohol By N-Chloro-4-Methylbenzene Sulphonamide In Acidic Medium And In Alkaline Media In The Presence Of Os(Viii) Catalyst-A Kinetic Pathway, Priyamvada Sharma, Riya Sailani, Anita Meena, Chandra Lata Khandelwal Jan 2020

Oxidation Of Crotyl Alcohol By N-Chloro-4-Methylbenzene Sulphonamide In Acidic Medium And In Alkaline Media In The Presence Of Os(Viii) Catalyst-A Kinetic Pathway, Priyamvada Sharma, Riya Sailani, Anita Meena, Chandra Lata Khandelwal

Turkish Journal of Chemistry

The kinetic pathway of oxidation of crotyl alcohol by sodium salt of $N$-chloro-4-methylbenzene sulphonamide (chloramine-T) in acidic and alkaline medium has been studied. The speciation of chloramine-T has been made to suggest a proper and reasonable reaction mechanism. The thermodynamic quantities such as activation energy and activation entropy are evaluated in acidic as well as in catalysed alkaline medium. An anticipated reaction mechanism has been suggested.

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Sorption Studies Of Europium On Cerium Phosphate Using Box-Behnken Design, Süleyman İnan Jan 2020

Sorption Studies Of Europium On Cerium Phosphate Using Box-Behnken Design, Süleyman İnan

Turkish Journal of Chemistry

Amorphous cerium phosphate was prepared and characterized. Three-level Box-Behnken design (BBD) was employed to analyze the effect of process variables such as initial pH (2-6), contact time (60--180 min), and sorbent amount (0.05-0.15 g) on the sorption capacity of europium. Analysis of variance (ANOVA) revealed that the main effect of initial pH and sorbent amount has a substantial impact on the sorption of Eu(III). Probability F-value (F = 3 $\times $ 10$^{-3})$ and correlation coefficient (R$^{2}$ = 0.97) point out that the model is in good accordance with experimental data. The maximum sorption capacity of Eu(III) was found to be …

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