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2022

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Articles 1381 - 1410 of 1634

Full-Text Articles in Chemistry

Chemical Constituents From The Fresh Pericarps Of Mature Mangosteen Fruit Garcinia Mangostana, Ahmad Tijani Azeez Jan 2022

Chemical Constituents From The Fresh Pericarps Of Mature Mangosteen Fruit Garcinia Mangostana, Ahmad Tijani Azeez

Chulalongkorn University Theses and Dissertations (Chula ETD)

α-Mangostin has been identified as a major chemical constituent in the pericarps of mangosteen (Garcinia mangostana Linn.) Over time, dried pericarps of mangosteen have been subjected to studies in literature. This study aimed to explore isolation of α-mangostin and other chemical constituents from the fresh pericarps of mature mangosteen fruits and investigate their relative antioxidant and anticancer activities. Repeated column chromatography on ethyl acetate and methanol extracts of fresh mature mangosteen pericarps led to the isolation of α-mangostin (33.25% of crude extracts) as the major compound, beta-mangostin (0.225%) and gartanin (7.57%). Their antioxidant scavenging activity was investigated against 2,2-diphenyl-1-picrylhydrazyl (DPPH) …

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Simultaneous Extraction And Colorimetric Detection Of Ions Using Gel Electromembrane, Ali Sahragard Jan 2022

Simultaneous Extraction And Colorimetric Detection Of Ions Using Gel Electromembrane, Ali Sahragard

Chulalongkorn University Theses and Dissertations (Chula ETD)

A total integrated electrocolorimetric sensing approach consisting of gel-based electromembrane extraction and colorimetric detection in one-step process was developed. This system was designed using colorimetric reagents preadded to the agarose gel for the determination of the following two model analytes: iodide for negative ions and nickel for positive ions. In this system, when a voltage was applied, the analytes were extracted and transferred from the sample solution (donor phase) to the gel (acceptor phase). The analytes then simultaneously reacted with the colorimetric reagents inside the gel, yielding blue and pink colors for iodide and nickel ions, respectively. These colors were …

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Fluorescent Hydrazine-Naphthalimide Encapsulated By Ethyl Cellulose For Detection Of Long-Chain Aldehydes, Faiza Lawan Isah Jan 2022

Fluorescent Hydrazine-Naphthalimide Encapsulated By Ethyl Cellulose For Detection Of Long-Chain Aldehydes, Faiza Lawan Isah

Chulalongkorn University Theses and Dissertations (Chula ETD)

One of the most common diseases globally which takes numerous lives is lung cancer. The high concentrations of aldehydes found in tobacco smoke and motor vehicle exhaust are among the contributors for lung cancer. There is a lot of interest in developing a nanosensor for identifying long-chain aldehydes. The conventional methods for detecting aldehyde are highly complex, expensive, and time-consuming. To overcome this drawback, alternative detection techniques such as fluorescence techniques are needed for the quick, easy, and affordable identification of aldehydes. Aldehyde molecules and their derivatives are often used as biomarkers to aid in the diagnosis and treatment of …

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Deep Eutectic Solvent-Coated Paper-Based Device For Colorimetric Detection Of Chromium(Vi), Fakhry Gripaldi Pandu Jan 2022

Deep Eutectic Solvent-Coated Paper-Based Device For Colorimetric Detection Of Chromium(Vi), Fakhry Gripaldi Pandu

Chulalongkorn University Theses and Dissertations (Chula ETD)

Hexavalent chromium, Cr(VI), is one of the heavy metal ions often found in the environment that is highly toxic and classified as a carcinogen. In this work, rapid screening and onsite monitoring of Cr(VI) using paper-based has been developed. Furthermore, a natural-based deep eutectic solvent, comprising choline chloride and thymol that makes it an environmentally friendly solvent, is applied as a coating medium on the test strips for qualitative and quantitative analysis of Cr(VI) for the first time. 1,5-Diphenylcarbazide was used as an indicator and complexing agent for Cr(VI). The detection was conducted by using a smartphone equipped with an …

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Use Of Layered Double Hydroxides As Ionophore For Anion Selective Electrode, Kittipong Konraeng Jan 2022

Use Of Layered Double Hydroxides As Ionophore For Anion Selective Electrode, Kittipong Konraeng

Chulalongkorn University Theses and Dissertations (Chula ETD)

Layered double hydroxides (LDHs) or hydrotalcite compounds are referred to anionic clays with specific anion adsorption and exchanging properties. These behaviors are similar to ionophores and ionic additives in ion selective electrodes (ISEs). Therefore, in this study LDHs was used to function as tailor-made ionophores for particular anions and ionic additives in ISEs. MgAl LDHs were prepared, and then modified the intercalated anions to be NO3-. The selective polymeric membrane was casted using PVC and MgAl LDHs-NO3-. The membrane containing 30%(w/w) MgAl LDHs-NO3- showed the best ISE characteristics toward NO3- with response slopes of -51.31 mV decade-1 in the concentration …

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Colorimetric Detection Of Norfloxacin And Ceftazidime By Modified Materials, Lalitphan Hongtanee Jan 2022

Colorimetric Detection Of Norfloxacin And Ceftazidime By Modified Materials, Lalitphan Hongtanee

Chulalongkorn University Theses and Dissertations (Chula ETD)

Novel approaches were developed for the colorimetric detection of norfloxacin and ceftazidime using chemically modified polymer resin and cotton sponge as sensing materials, respectively. For norfloxacin detection, the optimum condition was achieved by using a resin modified with 6.0 µM Congo red at pH 6 to extract norfloxacin in 10 mL of sample at pH 2. The reaction was completed within 15 minutes. Regarding ceftazidime detection, a cotton sponge functionalized with polyethyleneimine (PEI) was fabricated and characterized by FTIR, SEM, and ninhydrin test. To fabricate the PEI-sponge, 170 mM 3-aminopropyl triethoxysilane (APTES) was used to modify 1.0 g cotton fibers …

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Nickel Complexes Containing N4 Schiff-Base Macrocycles Dereived From Diphenylamine-2,2'-Dicarboxaldehyde For Catalytic Co2 Reduction, Methasit Juthathan Jan 2022

Nickel Complexes Containing N4 Schiff-Base Macrocycles Dereived From Diphenylamine-2,2'-Dicarboxaldehyde For Catalytic Co2 Reduction, Methasit Juthathan

Chulalongkorn University Theses and Dissertations (Chula ETD)

In this dissertation, nickel(II) complexes featuring N4-Schiff base macrocycles derived from diphenylamine-2,2'-dicarboxaldehyde (1-Ni and 2-Ni) with a new crystal structure ([2-Ni]Me) were synthesized and investigated for electrochemical CO2 reduction (ECR). Cyclic voltammetry (CV) of two nickel complexes, 1-Ni and 2-Ni, illustrated the catalytic response whereas one, [2-Ni]Me, virtually remained peak-shaped in the presence of CO2, indicating the feasibility of ECR activity for these nickel complexes. To develop heterogeneous ECR catalysts in aqueous media, all nickel complexes were adhered on N-doped graphene (NG) through non-covalent interaction, obtaining Ni@NG hybrid catalysts. The Ni@NG catalysts showed satisfactory ECR activity with the faradaic efficiency …

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Enhancement Of Ammonia Gas Sensing By Metal Oxide-Polyaniline Nanocomposite, Nattawut Soibang Jan 2022

Enhancement Of Ammonia Gas Sensing By Metal Oxide-Polyaniline Nanocomposite, Nattawut Soibang

Chulalongkorn University Theses and Dissertations (Chula ETD)

Ammonia (NH3) gas is an important chemical in many industries. Employees who work in those industrial areas may exposed to a certain concentration of NH3 which could cause various symptoms such as irritation of skin and eyes and problems in respiratory system. The development of new NH3 sensing material has drawn a great attention. In this study, porous tin dioxide nanofibers (SnO2 NFs) were successfully fabricated by an electrospinning technique. The SnO2 NFs were composited with polyaniline (PANI), conducting polymer and form tin dioxide nanofibers@polyaniline nanocomposite (SnO2 NFs@PANI). The morphology was characterized using SEM-EDS and XRD. The SnO2 NFs@PANI was …

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Emulsification Microextraction Using Surfactant Coupled With Colorimetric Detection For Determination Of Synthetic Dyes In Food, Niluh Indria Wardani Jan 2022

Emulsification Microextraction Using Surfactant Coupled With Colorimetric Detection For Determination Of Synthetic Dyes In Food, Niluh Indria Wardani

Chulalongkorn University Theses and Dissertations (Chula ETD)

In this thesis, solidification of floating organic drop-emulsification liquid-liquid microextraction (SFOD-ELLME) was combined with digital image colorimetry (DIC) for the analysis of synthetic dyes, such as rhodamine B (RhB) and crystal violet (CV) in food and drink samples. Here, the extraction was performed by using emulsified fatty acid surfactant and freezing procedure to separate the extracting phase. The solidified floating organic drop was then taken out, liquified and dropped on the paper platform for digital image colorimetric analysis. The response surface methodology-central composite design (RSM-CCD) was used to optimize some variables that influence the extraction efficiency. A sample of 7 …

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Development Of Dna Detection System Using G-Quadruplex As Catalyst For Colorimetric Detection With Pyrrolidinyl Peptide Nucleic Acid, Somlawan Thipkunthong Jan 2022

Development Of Dna Detection System Using G-Quadruplex As Catalyst For Colorimetric Detection With Pyrrolidinyl Peptide Nucleic Acid, Somlawan Thipkunthong

Chulalongkorn University Theses and Dissertations (Chula ETD)

Nucleic acid sequence detection is very important for many applications such as the diagnosis of genetic diseases. The development of new, simple yet effective methods is still in great demand. Among several options, colorimetric detection is a technique that does not require complicated instruments and allows the detection by naked eyes. In this work, a new colorimetric DNA detection system was developed using the combination of a pyrrolidinyl peptide nucleic acid (acpcPNA) probe and a G-quadruplex/hemin DNAzyme. The G-quadruplex is formed from G-rich DNA sequences, and in the presence of hemin, a DNAzyme is formed which effectively catalyzes the oxidation …

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Prediction Of Soil Sorption Coefficient Of Chemicals By Molecular Modeling Technique, Wasin Pithaktrakool Jan 2022

Prediction Of Soil Sorption Coefficient Of Chemicals By Molecular Modeling Technique, Wasin Pithaktrakool

Chulalongkorn University Theses and Dissertations (Chula ETD)

Soil pollution is one of the pollutions caused by nature and human activities, which are mostly the use of insecticide and chemical fertilizer to make plants grow well and produce more products. However, these chemicals are absorbed by soil. In this research work, properties of chemical compound affecting soil sorption were analyzed, and model that can predict soil sorption coefficient of chemicals (KOC) was examined by using quantitative structure property relationship (QSPR) technique. Totally 1,327 compounds were selected, and their three-dimensional structures were constructed. Semi-empirical PM7 method was used for geometry optimization calculations. A total of 1,536 physicochemical properties were …

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Synthesis Of Β,Β-Disubstituted Styrenes Via Trimethylsilyl Trifluoromethanesulfonate-Promoted Aldehyde-Aldehyde Aldol Addition-Deformylative Elimination., Grant J. Dixon, Michael R. Rodriguez, Tyler G. Chong, Kevin Y. Kim, C. Wade Downey Jan 2022

Synthesis Of Β,Β-Disubstituted Styrenes Via Trimethylsilyl Trifluoromethanesulfonate-Promoted Aldehyde-Aldehyde Aldol Addition-Deformylative Elimination., Grant J. Dixon, Michael R. Rodriguez, Tyler G. Chong, Kevin Y. Kim, C. Wade Downey

Chemistry Faculty Publications

In the presence of trimethylsilyl trifluoromethanesulfonate (TMSOTf) and 2,6-lutidine, α,α-disubstituted aldehydes condense with electron-rich aromatic aldehydes to yield β, β- disubstituted styrenes. More electron-rich aromatic aldehydes react more rapidly and in higher yield. Preliminary results suggest that the reaction may proceed via the ionization and formal deformylation of an aldol intermediate.

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A Simple Quantitative Method Using Tlc-Image Analysis To Determine Fructooligosaccharides (Fos) In Food Samples, Diana Beatriz Muñiz Márquez, Marco Antonio Mártinez Cervantes, Alain Martinez, Cristobal Aguilar, Pedro Agui̇lar Zarate, Jorge Enrique Wong Paz Jan 2022

A Simple Quantitative Method Using Tlc-Image Analysis To Determine Fructooligosaccharides (Fos) In Food Samples, Diana Beatriz Muñiz Márquez, Marco Antonio Mártinez Cervantes, Alain Martinez, Cristobal Aguilar, Pedro Agui̇lar Zarate, Jorge Enrique Wong Paz

Turkish Journal of Chemistry

The thin-layer chromatography technique (TLC) is a simple and inexpensive analysis commonly used to identify qualitatively the presence of carbohydrates in food samples such as mono- di and oligosaccharides particularly. TLC assay could be improved using image processing software for the semiquantitative determination of this type of compound. In the present work, TLC-image analysis with Silica Gel 60 TLC plates was used for the semiquantitative determination of 6 standards of carbohydrates (glucose, fructose, sucrose, 1-kestose, nystose, and fructofuranosylnystose). Subsequently, the areas of the spots of each compound were determined by digitizing in a conventional office scanner. Then, the segmentation of …

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The Study On Biological Activities Of Silver Nanoparticles Produced Via Green Synthesis Method Using Salvia Officinalis And Thymus Vulgaris, Ömer Ödemi̇ş, Sadi̇n Özdemi̇r, Serpi̇l Gonca, Ali̇ Arslantaş, Mehmet Sali̇h Ağirtaş Jan 2022

The Study On Biological Activities Of Silver Nanoparticles Produced Via Green Synthesis Method Using Salvia Officinalis And Thymus Vulgaris, Ömer Ödemi̇ş, Sadi̇n Özdemi̇r, Serpi̇l Gonca, Ali̇ Arslantaş, Mehmet Sali̇h Ağirtaş

Turkish Journal of Chemistry

In the present study, Ag nanoparticles (AgNPs) were synthesized from Salvia officinalis and Thymus vulgaris, known as phytotherapy plants. The obtained silver nanoparticles were characterized using SEM, XRD, FTIR, and UV/Vis spectra. The antioxidant capacities of Salvia officinalis-mediated AgNP (SO-AgNP) and Thymus vulgaris-mediated AgNP (TV-AgNP) were analyzed in vitro using 1,1-diphenyl-2-picrylhydrazyl and iron chelating activity assays. DPPH activities were 83.74% and 57.17% for SO-AgNP and TV-AgNP at concentration 200 mg/L, respectively. Both green synthesized AgNPs exhibited good iron chelating activity. In addition, the DNA cleavage activities of SO-AgNPs and TV-AgNP were investigated with agarose gel electrophoresis technique. …

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Ytterbium Oxide Nanofibers: Fabrication And Characterization For Energy Applications, Adem Sarilmaz Jan 2022

Ytterbium Oxide Nanofibers: Fabrication And Characterization For Energy Applications, Adem Sarilmaz

Turkish Journal of Chemistry

Metal oxide nanomaterials are widely used in many applications of renewable energy. Ytterbium oxide (Yb2O3) also attracts attention due to its similar structure to ZnO (~3,26 eV) and TiO2 (~3,36 eV) in terms of bandgap energy. In this study, Yb2O3 belonging to the lanthanide oxide family was produced as nanofiber forms by using the electrospinning technique, which allows for large-scale production, for the first time. The morphological, structural, optical, and phase properties of the produced nanofibers were investigated via XRD, SEM-Mapping, TEM, FTIR, UV-Vis, and XPS characterization techniques. As a result of …

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Amin-Modified Graphene Oxide As A Promising Adsorbent For Selective Extraction Of Dexamethasone Adulterant From Herbal Supplements, Mahboob Nemati, Ali Zayer, Samin Hamidi Jan 2022

Amin-Modified Graphene Oxide As A Promising Adsorbent For Selective Extraction Of Dexamethasone Adulterant From Herbal Supplements, Mahboob Nemati, Ali Zayer, Samin Hamidi

Turkish Journal of Chemistry

In most cases, herbal supplements found in illegal centers and herbal medicine stores have harmful content that causes irreparable damage to people. As a representative of the green chemistry method, a rapid and efficient dispersive micro solid-phase extraction (D-mSPE) method was applied to extract dexamethasone adulterant from handmade supplements sold as power natural enhancing materials. The quantification of the analyte was performed by high performance liquid chromatography with an ultraviolet detector. Effective parameters on the extraction recovery, including the type and amount of adsorbent, the kind of elution solvent, and the time of extraction and elution, were systematically investigated. The …

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Virus Detection Using Bio-Based Analysis Systems: A Review Of Biorecognition Strategies, Nur Meli̇s Kiliç, Di̇lek Odaci Demi̇rkol Jan 2022

Virus Detection Using Bio-Based Analysis Systems: A Review Of Biorecognition Strategies, Nur Meli̇s Kiliç, Di̇lek Odaci Demi̇rkol

Turkish Journal of Chemistry

Infectious illnesses are on the rise in today's world, with serious consequences for animals, plants, and humans. Several infections, including the human immunodeficiency virus, affect a large number of individuals in various countries, particularly in the poorer portions of contemporary society, and continue to cause a variety of health problems. Viruses are tiny parasitic organisms. They are infectious agents that can only reproduce within a live cell of an organism. Viruses may infect any living organism. For clinical pointof- care applications, early detections for harmful agents such as bacteria, viruses are critical. The possibility of worldwide epidemics as a result …

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The Sweet And Embellishing Lycium Arabicum Schweinf. Ex Boiss. Fruit Oil: A Potential Source Of Essential Ω-6 And Ω-9 Fatty Acids, Phytosterols, And Carotenoids, Jawhar Fakhfakh, Marwa Affes, Hazem Jabeur, Mohamed Ayadi, Noureddine Allouche Jan 2022

The Sweet And Embellishing Lycium Arabicum Schweinf. Ex Boiss. Fruit Oil: A Potential Source Of Essential Ω-6 And Ω-9 Fatty Acids, Phytosterols, And Carotenoids, Jawhar Fakhfakh, Marwa Affes, Hazem Jabeur, Mohamed Ayadi, Noureddine Allouche

Turkish Journal of Chemistry

In our current phytochemical investigation on the Tunisian plant Lycium arabicum Schweinf. ex Boiss., we attempted to explore the oil obtained from its fruits. This oil was extracted by cold maceration with ethanol and was analyzed to estimate its sterol and fatty acid content. The physicochemical parameters of the oil were also examined. They were specified in terms of acid value (0.8 ± 0.01 mg KOH g-1 oil), peroxide value (10.9 ± 0.02 meq O2 kg-1 oil), saponification value (162.97 ± 0.03 mg KOH g-1 oil), chlorophylls (1.011 ± 0.03 mg kg-1 oil) and carotenoids …

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Chromatographic Profile Of Major Whey Proteins In Some Dairy Beverages Based On Milk Serum, Doina Prodan, Miuta Filip, Mihaela Vlassa, Marioara Moldovan, Rahela Carpa Jan 2022

Chromatographic Profile Of Major Whey Proteins In Some Dairy Beverages Based On Milk Serum, Doina Prodan, Miuta Filip, Mihaela Vlassa, Marioara Moldovan, Rahela Carpa

Turkish Journal of Chemistry

The aim of this study was the determination of chromatographic profiles of major whey proteins (WP): α-lactalbumin (α-La), β-lactoglobulin A and B, (β-Lg A and B), bovine serum albumin (BSA) in dairy beverages based on Zonar milk serum. The studied WP were separated by high-performance liquid chromatography (HPLC) on Aeris XB-C18 column using gradient elution with 0.1% trifluoroacetic acid (TFA) in water and 0.1% TFA in 80% acetonitrile, at 214 nm detection. The HPLC method was validated for system suitability, selectivity/specificity, linearity (R2 ≥ 0.996), precision (RSD% ≤ 2.01), trueness (recovery 96.29%-102.08%), sensitivity (limits of quantification (LOQ) 1.35-10.08 μg/mL), …

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Encapsulation Of Halocadmate Anion Via Hydrogen Bonding: Synthesis And Characterization Of Bis(Diethylenetriamine)Cobalt(Iii) Complex Containing Hexabromocadmate Anion, Vinit Prakash, Ritu Bala, Amrinder Kaur, Daron E. Janzen Jan 2022

Encapsulation Of Halocadmate Anion Via Hydrogen Bonding: Synthesis And Characterization Of Bis(Diethylenetriamine)Cobalt(Iii) Complex Containing Hexabromocadmate Anion, Vinit Prakash, Ritu Bala, Amrinder Kaur, Daron E. Janzen

Turkish Journal of Chemistry

In this work, the encapsulation of [CdBr6]4- by six cations, [Co(dien)2]3+ has been described with the help of single crystal X-ray structural study in the complex, mer-[Co(dien)2]2[CdBr6]Br2. The complex anion, [CdBr6]4- has been obtained through solution method while attempting to synthesize complex dianion, [CdBr4]2-. This newly synthesized complex has been initially characterized by elemental analyses and spectroscopic studies (IR, NMR and UV-Visible). IR and NMR studies have been used for the isomeric identification of [Co(dien)2]3+ …

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Degradation Of Dye Containing In Textile Wastewater By Sequential Process: Photocatalytic And Biological Treatment, Jose Carlos Mendoza Hernandez, Gabriela Perez Osorio, Jose Eligio Moises Gutierrez Arias, Josefina Castañeda Camacho Jan 2022

Degradation Of Dye Containing In Textile Wastewater By Sequential Process: Photocatalytic And Biological Treatment, Jose Carlos Mendoza Hernandez, Gabriela Perez Osorio, Jose Eligio Moises Gutierrez Arias, Josefina Castañeda Camacho

Turkish Journal of Chemistry

In this research, a combined photocatalytic and biological treatment is proposed for the elimination of pollutants present in textile wastewater using a natural erionite zeolite (PE) and aluminum oxide (PA) synthesized by the sol-gel method as photocatalysts, and solar radiation. Both catalysts were characterized by XRD, SEM, and EDS. For biological treatment two bacterial consortium were used: BC1 (Escherichia coli N16, Serratia k120, Pseudomonas putida B03 and Enterobacter hormaechei), and consortium BC2 (Escherichia coli N16, Serratia Mc107, Enterobacter N9, Enterobacter hormaechei Mc9). The photocatalytic and microbiological treatments were carried out initially separately and subsequently in a …

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Binding Interactions Between Mixed-Monlayer Functionalized Gold Nanoparticles (Aunps) And The Serum Protein Albumin, Jennifer Hanigan-Diebel Jan 2022

Binding Interactions Between Mixed-Monlayer Functionalized Gold Nanoparticles (Aunps) And The Serum Protein Albumin, Jennifer Hanigan-Diebel

All Master's Theses

This study investigated the protein adsorption interactions of bovine serum albumin (BSA) with three different functionalized 5 nm gold nanoparticles (AuNPs) in order to determine the binding affinity and total amount of protein adsorbed to each AuNP surface chemistry. AuNPs were synthesized using two different capping agents to display three different surface chemistries: a neutral ω-functionalized thiol ligand (mercapto-ethoxy-ethoxy-ethanol, MEEE), a thiol ligand that is negatively charged at pH 7.4 (mercaptohexanoic acid, MHA), and a mixture of the two ligands (mixed-ligand AuNPs). The interactions of this library of AuNPs with bovine serum albumin (BSA) were investigated using UV-visible absorbance spectroscopy, …

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Synthesis, Molecular Modeling, And Biological Evaluation Of Novel Imatinib Derivatives Asanticancer Agents, Fulya Günay, Sevcan Balta, Yuk Yin Ng, Özlem Ulucan Açan, Zühal Turgut, Ömer Tahi̇r Günkara Jan 2022

Synthesis, Molecular Modeling, And Biological Evaluation Of Novel Imatinib Derivatives Asanticancer Agents, Fulya Günay, Sevcan Balta, Yuk Yin Ng, Özlem Ulucan Açan, Zühal Turgut, Ömer Tahi̇r Günkara

Turkish Journal of Chemistry

Different derivatives of imatinib were synthesized by a 3-step reaction method. The structures of the new compounds were characterized by spectroscopic methods. For quantitative evaluation of the biological activity of the compounds, MTT assays were performed, where four BCR-ABL negative leukemic cell lines (Jurkat, Reh, Nalm-6 and Molt-4), one BCR-ABL positive cell line (K562), and one non-leukemic cell line (Hek293T) were incubated with various concentrations of the derivatives. Although imatinib was specifically designed for the BCR-ABL protein, our results showed that it was also effective on BCR-ABL negative cell lines except for Reh cell line. Compound 9 showed lowest IC50 …

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Mechanical And Wetting Properties Of Coated Paper Sheets With Varying Polydimethylsiloxane Molecular Masses In The Coating Formulation, Çağla Söz Jan 2022

Mechanical And Wetting Properties Of Coated Paper Sheets With Varying Polydimethylsiloxane Molecular Masses In The Coating Formulation, Çağla Söz

Turkish Journal of Chemistry

Coated paper sheets were prepared by immobilizing a thin coating layer of cross-linked polydimethylsiloxane (PDMS) and inorganic particles onto Whatman filter paper Grade 1 (WFP) substrates. Several coatings that differed in terms of their PDMS molecular masses were sprayed onto WFP substrates to investigate the effect of this variation on the (i) wettability and (ii) mechanical properties of the samples. Different samples having clay or silica particles in the coating formulation were investigated separately. Nonwettable coated paper sheets with promising mechanical properties were achieved and further investigated in terms of (iii) thermal resistance.

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Increasing The Biocompatibility Of Graphene-Based Hybrid Nanostructures With Glycopolymer, Aydan Dağ, Pinar Si̇nem Omurtag Özgen, Belma Zengi̇n Kurt, Zehra Durmuş Jan 2022

Increasing The Biocompatibility Of Graphene-Based Hybrid Nanostructures With Glycopolymer, Aydan Dağ, Pinar Si̇nem Omurtag Özgen, Belma Zengi̇n Kurt, Zehra Durmuş

Turkish Journal of Chemistry

Hybrid nanostructures decorated with glycopolymers are appropriate for biomedical applications. In this paper, the results are obtained from nanographene (NG) decorated with glycoblock copolymer to increase their potential in use in therapies and in examining lectin interactions. A pyren-1-ylmethyl 4-cyano-4-((phenylcarbonothioyl)thio)pentanoate (CPADB-py) chain transfer agent was used in the synthesis of methyl methacrylate glycoblock copolymers (P2 and P3) by reversible addition-fragmentation chain transfer (RAFT) polymerization to adhere the polymer to the nanographene surface. Hybrid nanographenes (NG-1 and NG-2) were obtained by the non-covalent interaction of deprotected P2 and P3 with different fructopyranose groups (3-O-methacryloyl-1,2:4,5- di-O-isopropylidene-β-D-fructopyranose and 1-O-methacryloyl-2,3:4,5-di-O-isopropylidene-β-D-fructopyranose) in their backbones. Images …

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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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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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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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Microwave-Assisted Rapid Conjugation Of Horseradish Peroxidase-Dextran Aldehyde With Schiff Base Reaction And Decolorization Of Reactive Blue 19, Mi̇that Çelebi̇, Zafer Ömer Özdemi̇r, Murat Topuzoğullari Jan 2022

Microwave-Assisted Rapid Conjugation Of Horseradish Peroxidase-Dextran Aldehyde With Schiff Base Reaction And Decolorization Of Reactive Blue 19, Mi̇that Çelebi̇, Zafer Ömer Özdemi̇r, Murat Topuzoğullari

Turkish Journal of Chemistry

Microwave irradiation has become a routine technique in homogeneous and effective heating in organic synthesis. However, its application in enzyme-containing reactions is limited since it can cause denaturation of the enzyme. In this study, we have briefly investigated the effect of microwave heating on the conjugation reaction of horseradish peroxidase (HRP) with aldehyde derivative of dextran (D-CHO). The reaction was irradiated by microwave at 50 °C for 5 min. The conjugate was confirmed via GPC, in which the conjugates of HRP and D-CHO coexist with free unbound HRP molecules. Activity studies of HRP revealed that there is a small decrease …

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Quantifying Time-Dependent Structural And Mechanical Properties Of Uv-Aged Ldpe Power Cables Insulations, Abdallah Hedir, Ferhat Slimani, Mustapha Moudoud, Omar Lamrous, Tahar Touam, Madjid Teguar, Abderrahmane Haddad, Ali̇ Durmuş Jan 2022

Quantifying Time-Dependent Structural And Mechanical Properties Of Uv-Aged Ldpe Power Cables Insulations, Abdallah Hedir, Ferhat Slimani, Mustapha Moudoud, Omar Lamrous, Tahar Touam, Madjid Teguar, Abderrahmane Haddad, Ali̇ Durmuş

Turkish Journal of Chemistry

This paper reports effects of ultraviolet (UV) light radiation on the physicochemical, electrical and mechanical properties of low-density polyethylene (LDPE) cable insulating materials. Changes in structural and morphological properties of UV-aged samples were characterized by various analytical methods such as attenuated total reflection Fourier transform infrared spectroscopy (ATRFTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). Additionally, elongation at break, tensile strength, dielectric strength, and optical properties were also evaluated. Changes in some physical properties of LDPE after exposing to UV irradiation clearly highlighted that the polymer underwent the structural degradation. In addition, it was also …

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