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Acta Chimica Slovenica

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https://www.readbyqxmd.com/read/28621407/determination-of-microelements-in-human-milk-and-infant-formula-without-digestion-by-icp-oes
#1
Dijana Đurović, Branka Milisavljević, Mirjana Nedović-Vuković, Branislav Potkonjak, Snežana Spasić, Miroslav Vrvić
The concentrations of zinc (Zn), iron (Fe) and copper (Cu) in both human milk and infant formula were determined using a new sample preparation method, by inductively coupled plasma - optical emission spectometry (ICP-OES) and flame atomic absorption spectrometry (FAAS). Human milk samples were diluted in ultrapure water. The infant formula of powder samples (suitable for an infant 1-6 months of age) and standard reference material (SRM-1849) were analyzed in parallel. The results have shown that FAAS method was more sensitive for Fe determination in human milk while ICP-OES was more sensitive for both Zn and Cu detection...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621406/2d-frameworks-self-assembled-from-a-hydrazone-ligand-and-azide-salts-synthesis-structures-and-luminescent-property
#2
Peng Wang, Yu-Shan Wu, Xiao-Meng Han, Shan-Shan Zhao, Jie Qin
Three metal-organic coordination polymers [Cu(L)(N3)]·(H2O)0.25n (1), [Zn(L)(N3)]·(H2O)0.5n (2) and [Cd2(L)2(N3)2(H2O)]n (3) have been synthesized from hydrazone ligand N'-(1-(pyrazin-2-yl)ethylidene)isonicotinohydrazide (HL), NaN3 and corresponding metal nitrates. Complexes were characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction. All three complexes feature 2D coordination network in which L1- acts as NNON tetradentate ligand and azide acts as end-on bridging ligand...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621405/synthesis-and-structural-characterization-of-a-double-helical-dinuclear-copper-ii-complex-with-tetradentate-biacetyl-bis-benzoylhydrazone
#3
Rasoul Vafazadeh, Najmeh Abdollahi, C Anthony Willis
The reaction of tetradentate hydrazone ligand H2babh with Cu(CH3COO)2 in methanol solvent leads to the formation of the mono-nuclear complex [Cu(babh)]. However, on being dissolved in dichloromethane solvent and on addition of ethanol solvent, a dinuclear complex of [Cu2(μ1,3-babh)2(C2H5OH)2] is obtained. The X-ray crystallography indicates that the dinuclear helical complex formation is caused due to the unsymmetrical twisting of the H2babh ligand. One oxygen and two nitrogen atoms from the ligand and one oxygen atom from the other ligand coordinate to each copper(II) center...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621404/adsorption-kinetics-of-malachite-green-and-methylene-blue-from-aqueous-solutions-using-surfactant-modified-organoclays
#4
Haseeb Ullah, Muhammad Nafees, Farhat Iqbal, Muhammad Awan, Afzal Shah, Amir Waseem
The main objective of this research is to study the adsorption behaviour of malachite green and methylene blue dyes onto the surfactant modified natural clays. The results of SEM, XRD, IR, and thermal analysis confirms the intercalation of organic moiety in to the clay. The adsorption results show that pseudo-first order kinetics best fitted for both the dyes adsorbed on organo-clay. The data also reveals that both dyes are in a good agreement with Langmuir isotherm in both types of modified clays. The value of separation factor, RL, from Langmuir equation and Freundlich constant, n, give an indication of favourable adsorption...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621403/mixed-metal-oxides-of-the-type-coxzn1-xfe2o4-as-photocatalysts-for-malachite-green-degradation-under-uv-light-irradiation
#5
Martin Tzvetkov, Maria Milanova, Zara Cherkezova-Zheleva, Ivanka Spassova, Evgenia Valcheva, Joana Zaharieva, Mitov Ivan
A combination of thermal and mechanical (high energy ball milling) treatment was applied in an attempt to obtain polycrystalline mixed metal binary and ternary oxides of the type CoxZn1-xFe2O4 (x = 0; 0.25; 0.5; 0.75; 1). The synthetic procedure used successfully produced single-phased, homogeneous ZnFe2O4, CoFe2O4, and Co0.75Zn0.25Fe2O4, as well as mixed oxides, whose composition depended both on the duration of the high energy ball milling and the ratio Zn(II)/Co(II). The formation of spinel-like structures was proved by XRD, Mössbauer spectroscopy and Raman spectroscopy...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621402/microwave-assisted-synthesis-of-hybrid-heterocycles-as-potential-anticancer-agents
#6
Avula Srinivas, Malladi Sunitha, Kammachichu Raju, Banothu Ravinder, Siluveru Anusha, Thallapalli Rajasri, Pothuganti Swapna, Dupa Sushmitha, Deva Swaroopa, Gurala Nikitha, Chakunta Rao
In a one pot procedure, a series of novel hybrid heterocycles 6a-g and 7a-g were prepared by condensation of (3aS,4S,6S,6aS)-6-((1-(4-chlorophenyl)-1H-1,2,3-triazol-4-yl)methoxy)-2,2-dimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carbaldehyde 5 with mercapto acids and primary amines in the presence of ZnCl2 under both microwave irradiation and conventional heating conditions. Compound 5 was prepared from di-acetone D-mannose via a click reaction, primary acetonide deprotection and oxidative cleavage. Characterization of new compounds has been done by IR, NMR, MS and elemental analysis...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621401/encapsulation-of-sour-cherry-pomace-extract-by-freeze-drying-characterization-and-storage-stability
#7
Vesna Šaponjac, Gordana Ćetković, Jasna Čanadanović-Brunet, Sonja Đilas, Biljana Pajin, Jovana Petrović, Stajčić Slađana, Jelena Vulić
In this study sour cherry pomace was extracted with food-grade solvent (50% ethanol), concentrated and stabilized in whey and soy proteins by encapsulation. Soy proteins exhibited higher encapsulation efficiency (94.90%), but not significantly (p < 0.05), from whey (90.10%). Storage properties of whey (WP) and soy protein (SP) encapsulates in terms of total polyphenols, anthocyanins and antioxidant activity were tested for 6 weeks. At the end of storage period the retention of polyphenols in SP and WP was similar (67...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621400/study-on-the-equilibria-of-the-complex-formation-of-the-ion-pair-of-germanium-iv-with-4-nitrocatechol-and-1-4-diphenyl-3-phenylamino-1h-1-2-4-triazole
#8
Petya Racheva, Kirila Stojnova, Vidka Divarova, Vanya Lekova
The complex formation of the ion-pair formed between the anionic chelate of Ge(IV)-4-nitrocatechol (4-NC) and the cation of 1,4-diphenyl-3-(phenylamino)-1H-1,2,4-triazole (Nitron, Nt) in the liquid-liquid extraction system Ge(IV)-4-NC-Nt-H2O-CHCl3 was studied by spectrophotometry. The optimum extraction-spectrophotometric conditions for the complex formation were established. The validity of Beer's law was checked and some analytical characteristics of the system were calculated. The effect of co-existing ions and reagents on the process of complex formation was investigated...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621399/-mii-ncs-2-nia-2-oh2-2-preparation-crystal-structure-and-thermal-properties-mii-mn-fe-nia-nicotinamide
#9
Marta Počkaj, Nives Kitanovski, Boris Čeh, Romana Cerc-Korošec
Two novel isostructural coordination compounds of manganese(II) (1) and iron(II) (2) with common formulae [MII(NCS)2(nia)2(OH2)2] have been prepared from water solution of appropriate metal salt, nicotinamide and KSCN. Their crystal structures were determined by means of X-ray diffraction on single crystals. The mononuclear title compounds crystallize in a triclinic P-1 space group with six monodentate octahedrally arranged ligands around the metal centre. The coordination molecules are self-assembled with an extended network of hydrogen bonds into a three-dimensional structure...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621398/ab-initio-prediction-of-stable-confomeric-polymorphs-of-benzocaine-molecule-a-local-anaesthatic-molecule
#10
Pallipurath Nidhin, David Stephen, Selvaraj Arun Paul
An ab initio methodology to predict the crystal structures of thermodynamically stable polymorphs of benzocaine within the least energy region of energy landscape by analyzing the local minima from the initial gas phase optimization initiated through the flexible torsion using MP2/6-31G(d,p) method. The global search for the hypothetical dense packing for the structures within the energy penalty region of the local minima have revealed the possible stable conformers under a repulsion alone potential field. The generated hypothetical dense packings from the global search were selected for lattice minimization using the repulsion - dispersion potential field to authenticate the stability...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621397/new-bioactive-heteroleptic-copper-ii-carboxylates-structure-enzymatic-and-dna-binding-studies
#11
Afifa Mushtaq, Saqib Ali, Muhammad Tahir, Hammad Ismail, Bushra Mirza, Muhammad Saadiq, Muhammad Haleem, Muhammad Iqbal
Two new binuclear O-bridged copper(II) carboxylates with chemical formulas [Cu2(3-ClC6H4CH2COO)4(phen)2] (1) and [Cu2(3-ClC6H4CH2COO)4(bipy)2] (2) where phen = 1,10-phenanthroline and bipy = 2,2'-bipyridine have been synthesized and characterized by FT-IR, UV-Visible spectroscopy, CHN analysis and single crystal XRD. The results revealed distorted square pyramidal geometry around each copper atom of 1 and 2. The DNA interaction studies showed strong binding with Kb = 5.07 × 103 and 4.62 × 103 M-1 for 1 and 2, respectively...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621396/sodium-saccharin-as-an-effective-catalyst-for-rapid-one-pot-pseudo-five-component-synthesis-of-dihydropyrano-2-3-g-chromenes-under-microwave-irradiation
#12
Leila Moradi, Aghamohammad Sadegh
One-pot microwave-assisted synthesis of dihydropyrano[2,3-g]chromenes catalyzed by sodium saccharin as an efficient, mild and green catalyst was studied. The method presented is a safe and eco-friendly approach for the multicomponent synthesis of dihydropyrano[2,3-g]chromene derivatives with many merits including short reaction times (in comparison with other reported results), high yields and easy work up.
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621395/anti-inflammatory-and-anti-ulcer-activities-of-new-fused-thiazole-derivatives-derived-from-2-2-oxo-2h-chromen-3-yl-thiazol-4-5h-one
#13
Rafat Mohareb, Fatima Al-Omran, Mahmoud Abdelaziz, Rehab Ibrahim
The reaction of the 2-(4-oxo-4,5-dihydrothiazol-2-yl)acetonitrile (1) with salicylaldehyde (2) in 1,4-dioxane containing a catalytic amount of piperidine gave the coumarin derivative 3. The latter reacted with different reagents to give pyrano[4,5-b]thiazole, pyrido[4,5-b]thiazole and thieno[5,4-b]thiazole dereivatives. The anti-inflammatory and anti-ulcer activities of the newly synthesized products were evaluated and the results showed that compounds 7a, 8a, 10b, 13b, 15b, 18a, 19b, 19c, and 19d showed higher activity compared to the rest of the compounds...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621394/influence-of-various-soluble-carbonates-on-the-hydration-of-portland-cement-studied-by-x-ray-diffraction
#14
Simona Medvešček, Venčeslav Kaučič, Anton Meden
The effect of limestone on the hydration of Portland cement has been studied by many researchers. However, a possible influence of adding more soluble carbonates was not explained. Therefore we executed a qualitative and quantitative research on the influence of slightly soluble (CaCO3, MgCO3, dolomite), medium soluble (Li2CO3) and highly soluble (K2CO3 and KHCO3) carbonates on the hydration. Blending of Portland cement with differently soluble carbonates was found to influence the hydrate assemblage of the hydrated cement...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621393/synthesis-crystal-structures-and-catalytic-oxidation-of-manganese-iii-complexes-derived-from-salen-type-schiff-base-n-n-bis-5-nitrosalicylidene-ethane-1-2-diamine
#15
Qing-Bin Li, Yong-Jun Han, Gan-Qing Zhao, Ling-Wei Xue
Two mononuclear Schiff base manganese(III) complexes, [MnL(N3)(OH2)]·CH3OH (1) and [MnL(NCS)(OH2)] · H2O (2), where L is the dianionic form of N,N'-bis(5-nitrosalicylidene)ethane-1,2-diamine, have been prepared and characterized by elemental analysis, IR and UV-Vis spectroscopy and single crystal X-ray diffraction. The Mn atom in each complex is in an octahedral coordination. Molecules of the complexes are linked through intermolecular hydrogen bonds. Catalytic properties for epoxidation of styrene by the complexes using PhIO and NaOCl as oxidant have been studied...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621392/a-natural-based-method-for-hydrophobic-treatment-of-natural-fiber-material
#16
Thomas Kick, Thomas Grethe, Boris Mahltig
A treatment for hydrophobic functionalization of natural fiber materials is developed. This hydrophobic treatment is based mainly on natural products. As hydrophobic component the natural Tung Oil is used, which is originally a compound used for wood conservation purposes. The application on textile is done in a padding process under presence of an oxidative agent. For the current investigations a fiber felt from linen was used. The hydrophobic effect is determined by the concentration of Tung Oil and the duration of a thermal drying process...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621391/trace-determination-of-hg-ii-in-human-saliva-using-disposable-electrochemically-pretreated-graphite-pencil-electrode-surfaces
#17
Abdel-Nasser Kawde
An electrochemically pretreated graphite pencil electrode (PGPE) was designed to assay trace levels of Hg(II) in human saliva. The GPE was pretreated in 0.1 mol/L nitric acid by cycling the potential between -1.6 and -0.6 V for 60 cycles at a scan rate of 50 mV/s. The effects of pretreatment conditions, including media constituents, pH, and various electrochemical techniques and parameters, were analyzed and optimum conditions determined. Square wave anodic stripping voltammetry (SWASV) was used for the determination of Hg(II)...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621390/kemijski-laboratorij-celjske-kraljice-ob-580-letnici-kronanja-%C3%A4-e%C3%A5-ke-kraljice-barbare-celjske-chemical-laboratory-of-celje-queen-at-580th-anniversary-of-bohemian-coronation-of-queen-barbara-of-celje
#18
Stanislav Južnič
Barbara Celjska je bila gotovo najbogatejša alkimistka vseh časov. Prispevek skuša pojasniti kakšni poskusi so potekali v njenem laboratoriju in nakazati, katere tehniške kemijske naprave je utegnila pri tem uporabljati. Ker je bila večina leteh iz zlahka lomljivih snovi, bi bilo njihovo iskanje brškone brez haska, saj ni veliko upanja za njihovo ohranitev. Barbara of Cilli was certainly the richest female alchemist of all times. The article tries to explain what kind of experiments she carried out in her laboratory and indicate which technical chemical plant she likely has used...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621389/adsorptive-removal-of-malachite-green-from-model-aqueous-solutions-by-chemically-modified-waste-green-tea-biomass
#19
Cerasella Indolean, Silvia Burcă, Andrada Măicăneanu
The adsorption of malachite green (MG) from aqueous solution by waste green tea (WGT) biomass was investigated. A series of experiments in batch conditions were conducted in order to assess the MG removal on WGT, following adsorbent quantity and temperature influences. Maximum removal efficiency for untreated WGT was 89% (4 g biomass, 100 mL solution of 94 mg/L, 316 K). It was found that the adsorption of MG increased by increasing temperature from 296 to 316 K. Thermodynamic parameters (ΔH°, ΔS°, ΔG°) were calculated, and indicated that dye adsorption onto the studied biomass was endothermic and non-spontaneous...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621388/first-direct-isolation-of-stable-%C3%AE-form-crystals-of-mirabegron-a-selective-%C3%AE-3-adrenoceptor-agonist
#20
G Dattatray Deshmukh, N Mukund Bangal, C Anil Mali, J Vijay Medhane, T Vijayavitthal Mathad
An efficient and scalable method for the direct isolation of stable α-form crystals of Mirabegron (1) is developed. The developed method negates transformation of metastable β-form crystals into α-form crystals thereby overcoming the limitations of reported methods and avoids additional processing steps during its manufacture. The developed method directly provides stable α-form crystals of Mirabegron (1) with yield of around 84% and purity of >99.77% by HPLC in a single step.
June 2017: Acta Chimica Slovenica
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