1,449 results match your criteria Acta Chimica Slovenica[Journal]


Fabrication of Zirconium Silicate Reinforced Superhydrophobic Coating for the Evaluation of Corrosion-Resistance.

Acta Chim Slov 2022 Mar 15;69(1):1-12. Epub 2022 Mar 15.

Chikkaiah Naicker College, Erode.

The present work investigates on anodisation of aluminium in 1.0 M sodium oxalate and methodically evaluates the influence of zirconium silicate as an additive. The effect of additive upon structure, morphology, micro hardness and composition of the coating formed under various anodising conditions has been examined comprehensively. Read More

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Proposal of an HPLC/UV/FLD Screening Method for the Simultaneous Determination of Ten Antibiotics in Environmental Waters.

Acta Chim Slov 2022 Mar 15;69(1):49-59. Epub 2022 Mar 15.

Universidad Autónoma de Nuevo León Departamento de Química Analítica.

An HPLC-UV/FLD method for simultaneous detection of ten antibiotics in surface waters was developed. Antibiotics were extracted from water using solid phase extraction. An Atlantis T3 column was used with acetonitrile and 0. Read More

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A Novel Solid-State PVC-Membrane Potentiometric Dopamine-Selective Sensor Based on Molecular Imprinted Polymer.

Acta Chim Slov 2022 Mar 15;69(1):108-115. Epub 2022 Mar 15.

Giresun University, Center Research Laboratory Application and Research Center, Giresun.

A novel solid-state polyvinylchloride (PVC) membrane potentiometric dopamine-selective microsensor was constructed based upon dopamine-imprinted polymer used as the ionophore in the membrane structure. The optimum membrane composition was determined as 4% (w/w) MIP, 69% (w/w) bis(2-ethylhexyl) sebacate (DOS), 26% (w/w) PVC, and 1% (w/w) potassiumtetrakis(4-chlorophenyl) borate (KTpClPB). The detection limit of the microsensor was determined to be 3. Read More

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Acetyl Cellulose Film with 18-crown-6 Ether for Colorimetric Phosgene Detection.

Acta Chim Slov 2022 Mar 15;69(1):125-132. Epub 2022 Mar 15.

University of Defence.

The use of a cellulose detection film as a carrier for a colorimetric sensor to detect phosgene and allied compounds to be evaluated primarily visually is studied. For the case study, a benzimidazole-rhodamine dye and an acetyl cellulose film were selected. The detection complex was modified using cyclic ether 18-crown-6 to achieve more desirable analytic properties. Read More

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Synthesis and Application of Silica Supported Calix[4]arene Derivative as a New Processing Aid Agent for Reducing Hysteresis of Tread Rubber Compounds Used in Low Rolling Resistance Tires.

Acta Chim Slov 2022 Mar 15;69(1):98-107. Epub 2022 Mar 15.

Department of Chemistry, Islamic Azad University North Tehran Branch, Tehran..

Rolling resistance is one of the most important properties of a tire which is highly dependent on the viscoelastic properties of its rubber compounds. There are a lot of ways to reduce this parameter both in construction improvement of the tire and changing in rubber compound formulation especially in tire tread formulation. Rubber scientists have been trying to introduce new processing aid agents beyond the traditional tire components for reducing the rolling resistance. Read More

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Effects of Individual and Co-exposure of Copper Oxide Nanoparticles and Copper Sulphate on Nile Tilapia Oreochromis niloticus: Nanoparticles Enhance Pesticide Biochemical Toxicity.

Acta Chim Slov 2022 Mar 15;69(1):81-90. Epub 2022 Mar 15.

Adiyaman University.

Copper, like iron and zinc, is one of the most essential trace elements for organisms. Different forms of copper have distinctive and specific uses. For example, copper oxide nanoparticles (CuO-NP) are widely used in the world as a nanomaterial. Read More

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Synthesis, Crystal Structure and Separation Performance of p-tert-butyl(tetradecyloxy)calix[6]arene.

Acta Chim Slov 2022 Mar 15;69(1):227-234. Epub 2022 Mar 15.

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This work describes the investigation of separation performance of the p-tert-butyl(tetradecyloxy)calix[6]arene (C6A-C10-OH) as stationary phase for gas chromatography (GC) separations. Its structure was characterized by IR, 1H NMR, 13C NMR, MS and single-crystal X-ray diffraction analysis. The C6A-C10-OH column shows good separation capacity for aliphatic, aromatic and cis-/trans- isomers. Read More

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The Effect of Heuristics on the Reasoning of the Pre-Service Science Teachers on the Topic of Melting and Boiling Point.

Acta Chim Slov 2022 Mar 15;69(1):60-72. Epub 2022 Mar 15.

Van Yüzüncü Yıl University.

The purpose of this study was to explore the effects of the heuristics on the reasoning processes of pre-service science teachers on the topic of melting and boiling point using the ten heuristic model proposed by Talanquer. In this phenomenographic study carried out in the spring semester of the 2018-2019 academic year, interviews were conducted with 30 teacher candidates enrolled in the Science Teaching Program of Firat University Faculty of Education. Participants were asked to answer three different questions during the interviews. Read More

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The Students' Perceptions Using 3DChemMol Molecular Editor for Construction and Editing of Molecular Models.

Acta Chim Slov 2022 Mar 15;69(1):167-186. Epub 2022 Mar 15.

University of Ljubljana, Faculty of Natural Sciences and Engineering.

The paper presents a study in which 54 university students were introduced to a newly developed, free, web-based 3DChemMol molecular editor with a toolbar, which they then evaluated. The tool aims to increase representational competence related to submicroscopic representations. Students who used the software for the first time, were instructed to create molecular models using the model building/editing tools in three activities with varying levels of difficulty: 1) building a simple model (butanoic acid), 2) converting one model (hexane) into two models, 3) converting from a non-cyclic to a cyclic structure (glucose). Read More

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Modulation of Cerium Carbonate Crystal Growth by Polyvinylpyrrolidone using Density Functional Theory.

Acta Chim Slov 2022 Mar 15;69(1):133-146. Epub 2022 Mar 15.

Inner Mongolia University of Science and Technology.

Cerium carbonate crystal morphology is predicted using density functional theory (DFT) simulations in this paper. In the nucleation phase, the ketone group in polyvinylpyrrolidone (PVP) will preferentially bind to Ce3+ to form complexes and provide heterogeneous nucleation sites for the system, prompting the nucleation of cerium carbonate crystals. In the growth stage, due to the adsorption of PVP, the probability of (120) crystal plane appearing in the equilibrium state is the greatest, resulting in the formation of hexagonal flake cerium carbonate crystals with (120) crystal plane as the oblique edge. Read More

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Synthesis, Structure, Thermal Decomposition and Computational Calculation of Heterodinuclear NiII - ZnII Complexes.

Acta Chim Slov 2022 Mar 15;69(1):147-156. Epub 2022 Mar 15.

Ankara University.

Mononuclear NiL complex was prepared by the use of bis-N,N'-salicylidene-1,3-propanediamine and Ni(II) salts. NiL was treated with ZnBr2 and pyrazole and 3,5-lutidine coligands in a dioxane medium to prepare the following diheteronuclear complexes: [NiL·ZnBr2·(pyrazole)2] and [NiL·ZnBr2·(3,5-lutidine)2]. The complexes were characterized by elemental analysis, TG, IR and mass spectrometry. Read More

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Synthesis, Characterization, X-Ray Crystal Structures and Antibacterial Activity of Zinc(II) and Vanadium(V) Complexes Derived from 5-Bromo-2-((2-(methylamino)ethylimino)methyl)phenol.

Authors:
Cheng Liu

Acta Chim Slov 2022 Mar 15;69(1):157-166. Epub 2022 Mar 15.

Huaqiao University.

Three new zinc(II) and one vanadium(V) complexes, [Zn2Cl2L2] (1), [Zn2I2L2] (2), [ZnCl2(HL)] (3), and [V2O2(μ-O)2L2] (4), where L is 5-bromo-2-((2-(methylamino)ethylimino)methyl)phenolate, have been synthesized and characterized by elemental analyses, IR and UV-Vis spectra, as well as molar conductivity. Structures of the complexes were confirmed by single crystal X-ray diffraction. Complexes 1 and 2 are isostructural dinuclear zinc compounds, with the Zn atoms in square pyramidal coordination. Read More

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Metal Based Bioactive Nitrogen and Oxygen Donor Mono and Bis Schiff Bases: Design, Synthesis, Spectral Characterization, Computational Analysis and Antibacterial Screening.

Acta Chim Slov 2022 Mar 15;69(1):200-216. Epub 2022 Mar 15.

Department of Chemistry, University of Gujrat, Gujrat, Pakistan.

The scientific interest in developing the advanced metal based compounds to inhibit and control bacterial infections is continuously rising. Keeping in view their pharmacological significance, two new bioactive symmetrical phenylenediamine mono- and bis-Schiff bases, 2-{[(4-aminophenyl)imino]methyl}-6-methoxyphenol (L1) and 2,2'-{benzene-1,2-diylbis[nitrilomethylylidene]}bis(6-methoxyphenol) (L2) have been synthesized and characterized by using physical techniques, spectral methods, elemental and DFT based computational analysis with B3LYP/6-311++G(d, p) basis set. Furthermore, the synthesized ligands were complexed with VO, Mn, Co, Ni, Cu and Zn ions in ratio [M:L,1:2 and 1:1], respectively. Read More

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Two Oxidovanadium(V) Complexes with Hydrazone Ligands: Synthesis, Crystal Structures and Catalytic Oxidation Property.

Authors:
Yan Lei

Acta Chim Slov 2022 Mar 15;69(1):235-242. Epub 2022 Mar 15.

Chongqing Three Gorges University.

Two new oxidovanadium(V) complexes, [VOL1(aha)]DMF (1) and [VOL2(mat)] (2), where L1 and L2 are the dianionic form of N'-(4-bromo-2-hydroxybenzylidene)-3-methyl-4-nitrobenzohydrazide and N'-(3,5-dibromo-2-hydroxybenzylidene)pivalohydrazide, respectively, and aha and mat are the monoanionic form of acetohydroxamic acid and maltol, respectively, have been synthesized and structurally characterized by physico-chemical methods and single crystal X-ray determination. X-ray analysis indicates that the V atoms in the complexes are in octahedral coordination. Crystal structures of the complexes are stabilized by hydrogen bonds. Read More

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Synthesis of Glucose/Fructose Sensitive Poly(ethylene glycol) Methyl Ether Methacrylate Particles with Novel Boronate Ester Bridge Crosslinker and their Dye Release Applications.

Acta Chim Slov 2022 Mar 15;69(1):39-48. Epub 2022 Mar 15.

Konya Technical University.

In this study, it is aimed to develop glucose/fructose sensitive poly(ethylene glycol) methyl ether methacrylate (PEGMA) particles which can be employed in controlled drug delivery applications. For this purpose, a boric acid based crosslinker was synthesized using 4-vinylphenylboronic acid and its formation was confirmed by 1H-NMR and FT-IR analyses. Sugar-sensitive polymeric particles were then achieved using this crosslinker and PEGMA monomer in single step and surfactant free emulsion polymerization technique. Read More

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Metal and Non-Metal Modified Titania: the Effect of Phase Composition and Surface Area on Photocatalytic Activity.

Acta Chim Slov 2022 Mar 15;69(1):217-226. Epub 2022 Mar 15.

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The application of TiO2 photocatalysis in various environmental fields has been extensively studied in the last decades due to its ability to induce the degradation of adsorbed organic pollutants. In the present work, TiO2 powders doped and co-doped with sulfur and nitrogen and modified with platinum were prepared by particulate sol-gel synthesis. PXRD measurements revealed that the replacement of HCl with H2SO4 during synthesis reduced the size of the crystallites from ~ 30 nm to ~20 nm, increasing the surface area from ~44 m2/g to ~80 m2/g. Read More

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Synthesis of Fused Quinoline Derivatives With Antiproliferative Activities and Tyrosine Kinases, Pim-1 Kinase Inhibitions.

Acta Chim Slov 2022 Mar 15;69(1):13-29. Epub 2022 Mar 15.

Chemistry Department, faculty of science, Cairo university.

Cyclohexan-1,3-dione (1) reacted with either 2-aminoprop-1-ene-1,1,3-tricarbonitrile (2a) or diethyl 3-amino-2-cyanopent-2-enedioate (2b) to give the 5,6,7,8-tetrahydronaphthalene derivatives 3a and 3b, respectively. The latter compounds underwent further heterocyclization reactions to give the thieno[2',3':5,6]benzo[1,2-e][1,3]oxazine derivatives. On the other hand, the reaction of compound 1 with trichloroacetonitrile afforded the (2,2,2-trichloroethylidene)cyclohexane derivative 14. Read More

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Glucose-Decorated Silica-Molybdate Complex: A Novel Catalyst for Facile Synthesis of Pyrano[2,3-d]-Pyrimidine Derivatives.

Acta Chim Slov 2022 Mar 15;69(1):30-38. Epub 2022 Mar 15.

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This article describes the preparation and identification of [email protected]/Si(OEt)2(CH2)3N=Mo[Mo5O18] as a new bifunctional acid-base catalyst (both acidic and basic Lewis sites). Aminopropyltriethoxysilane was first reacted with hexamolybdate anions and then treated with glucose to prepare Glu/Si(OEt)2(CH2)3N=Mo[Mo5O18]. Nano-silica was then modified by the prepared glucose/molybdate complex to obtain [email protected]/Si(OEt)2(CH2)3N=Mo[Mo5O18]. Read More

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Synthesis of the New 1-(7-Methoxy-1-benzofuran-2-yl)-3-(4-methylphenyl)prop-2-en-1-one and Controlling of Spectroscopic, Optical and Conductivity Properties by Concentration.

Acta Chim Slov 2022 Mar 15;69(1):73-80. Epub 2022 Mar 15.

Firat University.

Chalcone derivatives have an important place in science due to their different applications ranging from their semiconductor properties to biological properties. In this work 1-(7-methoxy-1-benzofuran-2-yl)-3-(4-methylphenyl)prop-2-en-1-one (2) has been prepared by condensation of 1-(7-methoxy-1-benzofuran-2-yl)ethanone with 4-methylbenzaldehyde in basic medium. The chemical structure of 2 was confirmed by elemental analysis, FT-IR, 1H NMR and 13C NMR. Read More

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A Facile Synthesis of Bioactive Five- and Six-membered N-heterocyclic Aromatic Compounds Using AlCoFe2O4 as a Green Catalyst.

Acta Chim Slov 2022 Mar 15;69(1):91-97. Epub 2022 Mar 15.

Payam Noor University.

Nitrogen-containing heterocycles have been extensively studied due to their broad biological and pharmaceutical applications. In this study, we synthesized five- and six-membered nitrogen-containing rings through one-pot multicomponent reaction using an aluminium-doped cobalt ferrite nano-catalyst. The nano-catalyst was prepared by the co-precipitation method from the corresponding metal salts. Read More

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Combustion Synthesis of Nano Fe2O3 and its Utilization as a Catalyst for the Synthesis of Nα-Protected Acyl Thioureas and Study of Anti-bacterial Activities.

Acta Chim Slov 2022 Mar 15;69(1):116-124. Epub 2022 Mar 15.

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A simple and eco-friendly nano Fe2O3 heterogeneous catalytic system is described for the synthesis of acyl thiourea derivatives from corresponding in situ generated acyl isothiocyanates and amino acid esters in acetone obtained in good yields. The structures of synthesized acyl thioureas were confimed by 1H NMR, 13C NMR, mass, and FTIR analysis. Fe2O3 NPs has been prepared via a solution combustion route using ascorbic acid as the reducing agent and ferric nitrate as the source of iron. Read More

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Synthesis of New Regioisomers of 5-Nitro-1,4-Naphthoquinone, Evaluation of Antioxidant and Catalase Inhibition Activities.

Acta Chim Slov 2022 Mar 15;69(1):187-199. Epub 2022 Mar 15.

Istanbul University-Cerrahpasa.

The studies on nitronaphthoquinone derivatives are rare in the literature, and the nitro group associated with the aromatic ring in the quinone system is known to increase the biological activity of naphthoquinone due to its electron-withdrawing properties. In the course of quinone derivatives, the new N(H)-substituted-5-nitro-1,4-naphthoquinones (NQ) as regioisomers were synthesized by reactions of 2,3-dichloro-5-nitro-1,4-naphthoquinone with some heterocyclic ring substituted nucleophiles such as anilines, piperazines, or morpholines, according to a Michael 1,4-addition mechanism. Five NQ regioisomer couples having different functional group (2-chloro-isomers 3, 5, 7, 9 and 13; 3-chloro-isomers 2, 4, 6, 8 and 12) are reported here. Read More

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Crystallography and DFT Studies of Synthesized Tetraketones.

Acta Chim Slov 2022 Mar 15;69(1):243-250. Epub 2022 Mar 15.

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Two tetraketone derivatives, one previously reported and one novel, were synthesized, whose structures have been confirmed by elemental analyses, NMR, HPLC-MS, and IR spectroscopy. The crystal structures of synthesized tetraketones were determined using X-ray single-crystal diffraction. To analyze the molecular geometry and compare with experimentally obtained X-ray crystal data of synthesized compounds 1 (2,2'-((4-nitrophenyl)methylene)bis(5,5-dimethylcyclohexane-1,3-dione)) and 2 (2,2'-((4-hydroxy-3-methoxy-5-nitrophenyl)methylene)bis(5,5-dimethylcyclohexane-1,3-dione)), DFT calculations were performed with the standard 6-31G*(d), 6-31G**, and 6-31+G* basis sets. Read More

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Model Electrochemical Biosensor for the Detection of Methanol in Aqueous Solutions with Yeast Cells.

Acta Chim Slov 2021 Dec 15;68(4):773-780. Epub 2021 Dec 15.

University of Maribor, Faculty of Chemistry and Chemical Engineering.

An electrochemical device that serves as a model biosensor and contains yeast Saccharomyces cerevisiae as the active biological element was developed. Different configurations of the electrochemical cells were assembled and tested. Stainless steel was used in the electrochemical cell composition process and the surface of this metal electrode was modified with a thin layer of WO3 if necessary. Read More

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December 2021

Electrochemical Oxidation of Different Therapeutic Classes of Pharmaceuticals Using Graphite-PVC Composite Electrode.

Acta Chim Slov 2021 Dec 15;68(4):811-820. Epub 2021 Dec 15.

1- Faculty of Pharmacy, University of Al-Ameed, Karbala, Iraq.

This study reports electrochemical treatment of different therapeutic classes of pharmaceuticals (caffeine, prazosin, enalapril, carbamazepine, nifedipine, levonorgestrel, and simvastatin) in a mixture. The electrochemical process was investigated using graphite-PVC anode at different applied voltages (3, 5, and 12 V), initial concentrations of studied pharmaceuticals in aqueous solution (5 and 10 mg/L), and concentrations of sodium chloride (1 and 2 g/L). The % removal of pharmaceuticals increased with the applied voltage, and was found higher than 98% after 50 min of electrolysis at 5 V. Read More

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December 2021

Medicinal Plants Extracts Impact on Oxidative Stress in Mice Brain Under the Physiological Conditions: the Effects of Corn Silk, Parsley, and Bearberry.

Acta Chim Slov 2021 Dec 15;68(4):896-903. Epub 2021 Dec 15.

Emergency Centre, Clinical Centre of Vojvodina, Hajduk Veljkova 1, 21000 Novi Sad, Serbia.

This study was performed to examine the effects of medicinal plant extracts of corn silk (Stigma maydis), parsley leaf (Petroselini folium), and bearberry leaf (Uvae ursi folium) on antioxidant status of the brain of experimental animals (mice) under the physiological conditions. Biological properties of these plants are insufficiently investigated and the aim was to explore their possible antioxidant effects that can alleviate oxidative damage of the brain tissue. Corn silk extract showed positive effect on activities of antioxidant enzymes in mice brain tissue. Read More

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December 2021

Determination of Some Elements in Legumes Using ICP-MS and EDXRF Methodology Applications.

Acta Chim Slov 2021 Dec 15;68(4):913-920. Epub 2021 Dec 15.

Agricultural Institute of Slovenia.

The current study involves two analytical research techniques, inductively coupled plasma-mass spectrometry (ICP-MS) and energy dispersive X-ray fluorescence (EDXRF) spectroscopy, used to determine the elemental composition of different legumes usually produced and consumed in Slovenia. Results indicate that data obtained using these methods are in agreement with certified reference materials. In total, nineteen elements were determined from twenty legume samples. Read More

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December 2021

Development and Evaluation of Lyophilized Methotrexate Nanosuspension using Quality by Design Approach.

Acta Chim Slov 2021 Dec 15;68(4):861-881. Epub 2021 Dec 15.

Department of Pharmaceutics, Smt. Kashibai Navale College of Pharmacy, Kondhwa, Pune (Maharashtra) 411048, India..

With the application of the quality by design (QbD) approach, a high-pressure homogenizer (HPH) methodology was employed to develop methotrexate nanosuspension (MTX-NS) to boost bioavailability. The Ishikawa diagram was used to analyze potential risk factors in formulation development. To screen and study the impact of various formulation and process factors on the critical quality attributes (CQA), the Placket-Burman design and central composite design were utilized. Read More

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December 2021

Lomustine Incorporated Lipid Nanostructures Demonstrated Preferential Anticancer Properties in C6 Glioma Cell Lines with Enhanced Pharmacokinetic Profile in Mice.

Acta Chim Slov 2021 Dec 15;68(4):970-982. Epub 2021 Dec 15.

Centurion University of Technology and Management, odisha, India.

Effective treatment of glioma still stands as a challenge in medical science. The work aims for the fabrication and evaluation of lipid based nanostructures for improved delivery of lomustine to brain tumor cells. Experimental formulations (LNLs) were developed by modified lipid layer hydration technique and evaluated for different in vitro characteristics like particle size analysis, surface charge, surface morphology, internal structure, in vitro drug loading, drug release profile etc. Read More

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December 2021

Synthesis of Adenine-based Fluorescent and Naked-eye Chemosensors: Specific DNA Probes for The Detection of Bacterial Pathogens.

Acta Chim Slov 2021 Dec 15;68(4):781-790. Epub 2021 Dec 15.

Muğla Sıtkı Koçman University.

A rapid and confident tool to identify and diagnose bacterial pathogens with more accuracy using DNA as fingerprints is necessary. Herein, we report a smart chemosensor having a terminal adenine sticking to the thymine of single-stranded DNA (ssDNA) through supramolecular interactions and, which leaves ssDNA when the same ssDNA matches with the targeting desired DNA. We have synthesized a naked-eye coloured chemosensor with carbazole. Read More

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December 2021