Vol 80, No 1 - Abstracts

JSCS Vol 80, No 1

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Whole issue - PDF 4,106 kB

J. Serb. Chem. Soc. 80 (1) 1–8 (2015)

UDC 582.282.123.4:547.26’11+577.152.3+543.24:665.327.3; JSCS–4691; doi: 10.2298/JSC140401071D; Original scientific paper

Optimization of the fermentation conditions and substrate specifity of mycelium-bound ester hydrolases of Aspergillus oryzae Cs007

HONG DE YAN, HONG CAI LIU and ZHAO WANG

College of Biological and Environmental Engineering, Zhejiang University of Technology, 310014 Hangzhou, People’s Republic of China

(Received 1 April, revised 6 July, accepted 7 July 2014)

In order to improve the activities of mycelium-bound ester hydrolases of Aspergillus oryzae Cs007, the main production conditions were investigated. The activities of the ester hydrolases were simultaneously determined by titration assay and spectrophotometric assay methods, using olive oil and p-nitrophenyl esters as substrates, respectively. The optimum carbon source and nitrogen source were olive oil and peptone, at concentrations of 1 and 2.2 %, respectively. The effects of the carbon source, the nitrogen source and their concentrations on the production of the enzymes were identical when the enzymes activities were assayed by the two methods. The mycelium-bound enzymes showed hydrolytic activity toward all the tested p-nitrophenyl esters, triglycerides and fatty acid ethyl esters, but it showed greater preference for long-chain triglycerides and short-chain p-nitrophenyl esters.

Keywords: ester hydrolases; lipases; carboxylesterases; Aspergillus oryzae; p-nitrophenyl esters; olive oil.

Full Article - PDF 176 kB Available OnLine: 07. 07. 2014. Cited by

J. Serb. Chem. Soc. 80 (1) 9–20 (2015)

UDC 638.27:543.544.3+66.095.23:547.466.3; JSCS–4692; doi: 10.2298/JSC140401073W; Original scientific paper

An effective GC method for the determination of the fatty acid composition in silkworm pupae oil using a two-step methylation process

JUN WANG*^,**, WEIWEI WU*, XUDONG WANG*, MIN WANG1 and FUAN WU*^,**

*School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212018, P. R. China

**Sericultural Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang 212018, P. R. China

(Received 1 April, revised 9 July, accepted 11 July 2014)

In the search for an accurate and effective method for the determination of the fatty acid composition in silkworm pupae oils, five methylation methods were evaluated for use in the gas chromatographic (GC) quantification of fatty acid methyl esters (FAMEs). These included two one-step acid-catalyzed (H2SO4 and BF3) and two one-step base-catalyzed (KOH and NaOCH3) esterification processes, as well as a two-step procedure catalyzed successively by KOH and H2SO4. These methods were comparatively adopted to quantify FAMEs in silkworm pupae oil using GC–MS and GC and then their precision, stability and average recovery rates were validated. The results indicated that compared with the four one-step methyl esterification methods, the two-step methylation effectively improved the synthesis yield of FAMEs, conserved the agents and eliminated the usage of potential harmful reagents. The proposed GC method was validated, exhibited good accuracy and precision, and was successfully applied to the quantification of FAMEs in several varieties of silkworm pupae oils. The short analytical run time leads to low costs and a fast chromatographic procedure. In summary, two-step pretreatment had superior performance, providing technical references for the determination and analysis of fatty acids in other oils.

Keywords: fatty acid; fatty acid methyl ester; gas chromatography; silkworm pupae oil; two-step methylation.

Full Article - PDF 199 kB Supplementary Material PDF 1,029 kB Available OnLine: 11. 07. 2014. Cited by

J. Serb. Chem. Soc. 80 (1) 21–33 (2015)

UDC 547.565+631.576.4:641.3:615.27–188(497.11); JSCS–4693; doi: 10.2298/JSC140407062D; Original scientific paper

Fibre and polyphenols of selected fruits, nuts and green leafy vegetables used in Serbian diet

MARGARITA DODEVSKA, SLADJANA ŠOBAJIĆ AND BRIŽITA DJORDJEVIĆ

University of Belgrade, Faculty of Pharmacy, Department of Bromatology, Belgrade, Serbia

(Received 4 April, revised 3 June, accepted 4 June 2014)

Fruits and vegetables are known as good sources of numerous bioactive compounds AMong which polyphenols and dietary fibre are considered essential because of their protective health effects. The aim of this study was to characterize the quality of selected plant foods of Serbia regarding the AMount of total phenols, fibres and ratio of certain fractions of fibre. Fifteen sAMples of plant foods (green leafy vegetables, fruits and nuts) were evaluated for their total antioxidant activity, total phenolic content, total, soluble and insoluble fibre and fractions of fibre: β-glucans, arabinoxylan, cellulose and resistant starch. Generally, nuts were the richest sources of fibre and total phenols. However, when serving size was taken into consideration, it appeared that raspberry and blackberry were the richest in total, soluble fibre and cellulose. Furthermore, almonds and hazelnuts were particularly rich in insoluble fibre, while walnuts had the highest polyphenol content. The analyzed plant foods were poor sources of arabinoxylan and β-glucan. Data on the presence of resistant starch in cashew nut was the first confirmation that resistant starch could be found in significant AMount in some nuts. The results give rare insight into the quality of selected plant foods regarding dietary fibre and polyphenols from the nutritive point of view.

Keywords: total fibre; fractions of fibre; total phenols; antioxidant activity.

Full Article - PDF 164 kB Available OnLine: 04. 06. 2013. Cited by

J. Serb. Chem. Soc. 80 (1) 35–43 (2015)

UDC 546.562+542.9+547.571+547.551+547.576+547.313.2–304.2; JSCS–4694; doi: 10.2298/JSC140201078S; Original scientific paper

Cu(II) complexes of an ionic liquid-based Schiff base [1-{2-((2-hydroxybenzylidene)AMino)ethyl}-3-methylimidazolium]PF₆: Synthesis, characterization and biological activities

SANJOY SAHA, DHIRAJ BRAHMAN* and BISWAJIT SINHA*

1Department of Chemistry, Kalimpong College, Kalimpong-734301, India

*Department of Chemistry, University of North Bengal, Darjeeling-734013, India

(Received 1 February, revised 1 June, accepted 21 July 2014)

Two Cu(II) complexes of an ionic liquid based Schiff base 1-{2-[(2-hydroxybenzylidene)AMino]ethyl}-3-methylimidazolium hexafluorophosphate, were prepared and characterized by different analytical and spectroscopic methods such as elemental analysis, magnetic susceptibility, UV–Vis, IR and NMR spectroscopy, and mass spectrometry. The Schiff base ligand was found to act as a potential bidentate chelating ligand with N, O donor sites and formed 1:2 metal chelates with Cu(II) salts. The synthesized Cu(II) complexes were tested for their biological activity.

Keywords: ionic liquid based Schiff base; salicylaldehyde; Cu(II) complexes; 1-(2-AMinoethyl)-3-methylimidazolium hexafluorophosphate.

Full Article - PDF 258 kB Supplementary Material PDF 114 kB Available OnLine: 20. 07. 2014. Cited by

J. Serb. Chem. Soc. 80 (1) 45–51 (2015)

UDC 546.732+547.785.5+546.137:548.7:543.42; JSCS–4695; doi: 10.2298/JSC140415081T; Original scientific paper

Synthesis, crystal structure and properties of [Co(L)₂](ClO₄)₂(L = 1,3-bis(1H-benzimidazol-2-yl)-2-oxapropane)

AYDIN TAVMAN and CIGDEM SAYIL

Department of Chemistry, Faculty of Engineering, Istanbul University, Avcilar, 34320, Istanbul, Turkey

(Received 15 April, revised 26 July, accepted 28 July 2014)

The reaction of 1,3-bis(1H-benzimidazol-2-yl)-2-oxapropane (L) with Co(ClO4)2·6H2O in absolute ethanol yielded the bis[1,3-bis(1H-benzimidazol-2-yl-kN3)-2-oxapropane]cobalt(2+) diperchlorate chelate complex ([Co(L)2](ClO4)2, 1). Complex 1 was characterized by elemental analysis, magnetic moment and molar conductivity measurements, thermogravimetric analysis, FT-IR, UV–Vis and mass spectrometry, and its solid-state structure was determined by single crystal X-ray diffraction. According to the elemental and thermogravimetric analysis data, no water either coordinated or uncoordinated is present in 1. Complex 1 has 1:2 M:L ionic characteristic according to the molar conductivity value. In the complex, the distances between the cobalt and the ethereal oxygen atoms (Co1–O2: 2.805(3); Co2–O1: 2.752(2) Å) show semi-coordination bonding and the Co(II) ion is six-coordinated with a N4O2 ligand set, resulting in a distorted octahedron.

Keywords: bis-benzimidazole; oxapropane; cobalt(II) perchlorate; semi-coordination; X-ray diffraction; spectroscopy.

Full Article - PDF 375 kB Supplementary Material PDF 447 kB Available OnLine: 28. 07. 2014. Cited by

J. Serb. Chem. Soc. 80 (1) 53–62 (2015)

UDC 547.421.22–31+547.556.3:541.124; JSCS–4696, doi: 10.2298/JSC140509056J; Original scientific paper

A theoretical study on the mechanism of the reaction between azacyclopropenylidene and oxirane

YING JING AND XIAOJUN TAN *

The General Hospital of Jinan Military Command, Jinan, Shandong, 250031, P. R. China

*College of Biological Science and Technology, University of Jinan, Jinan, Shandong, 250022, P. R. China

(Received 12 May, accepted 28 May 2014)

The reaction mechanism between azacyclopropenylidene and oxirane was systematically investigated employing the second-order Møller–Plesset perturbation theory (MP2) method to understand better the reactivity of azacyclopropenylidene with the three-membered ring compound oxirane. Geometry optimization, vibrational analysis, and energy property for the involved stationary points on the potential energy surface were calculated. The energies of all the species were also further corrected by CCSD(T)/6-311+G single-point calculations. The calculational results showed that there are two possible reaction pathways. From the kinetic viewpoint, the first pathway is primary. From the viewpoint of thermodynAMics, the second dominates.

Keywords: azacyclopropenylidene; oxirane; reaction mechanism; MP2 method.

Full Article - PDF 355 kB Available OnLine: 28. 05. 2014. Cited by

J. Serb. Chem. Soc. 80 (1) 63–72 (2015)

UDC 547.979.4+548.7+542.913:543.424.2:543.426.1; JSCS–4697; doi:10.2298/JSC140819117M; Original scientific paper

Facile synthesis of water-soluble curcumin nanocrystals

ZORAN M. MARKOVIĆ, JOVANA R. PREKODRAVAC, DRAGANA D. TOŠIĆ, IVANKA D. HOLCLAJTNER-ANTUNOVIĆ*, MOMIR S. MILOSAVLJEVIĆ, MIROSLAV D. DRAMIĆANIN and BILJANA M. TODOROVIĆ-MARKOVIĆ

Vinča Institute of Nuclear Sciences, University of Belgrade, P. O. Box 522, 11001 Belgrade, Serbia

*Faculty for Physical Chemistry, University of Belgrade, Studentski trg 14–16, 11000 Belgrade, Serbia

(Received 19 August, revised 12 November, accepted 21 November 2014)

In this paper, a facile synthesis of water-soluble curcumin nanocrystals is reported. Solvent exchange method was applied to synthesize curcumin nanocrystals. Different techniques were used to characterize the structural and photophysical properties of the curcumin nanocrystals. It was found that the nanocurcumin prepared by this method had good chemical and physical stability, could be stored in the powder form at room temperature, and was freely dispersible in water. It was established that the size of curcumin nanocrystals varied in the range of 20–500 nm. Fourier transform infrared spectroscopy and UV–Vis analyses showed the presence of tetrahydrofuran inside the curcumin nanocrystals. Furthermore, it was found that the nanocurcumin emitted photoluminescence with a yellow–green color.

Keywords: curcumin nanocrystals; atomic force microscopy; transmission electron microscopy; RAMan spectroscopy; photoluminescence spectroscopy.

Full Article - PDF 244 kB Available OnLine: 21. 11. 2014. Cited by

J. Serb. Chem. Soc. 80 (1) 73–86 (2015)

UDC 546.47’73’74+543.421:544.654.2:620.193; JSCS–4698; doi: 10.2298/JSC260814113B; Original scientific paper

Ternary Zn–Ni–Co alloy: anomalous codeposition and corrosion stability

MILORAD V. TOMIĆ, MILOŠ M. PETROVIĆ*, SLAVKA STANKOVIĆ**, SANJA I. STEVANOVIĆ*** and JELENA B. BAJAT**

University of Eastern Sarajevo, Faculty of Technology Zvornik, Republic of Srpska, B &AMp; H

*Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research) 3 Research link, Singapore 117602, Department of Mechanical Engineering, National University of Singapore, Singapore 117576

**Faculty of Technology and Metallurgy, University of Belgrade, P. O. Box 3503, 11120 Belgrade, Serbia

***ICTM – IEC, P. O. Box 473, 11001 Belgrade, Serbia

(Received 28 August, revised 31 October, accepted 13 November 2014)

Electrochemically deposited Zn–Ni–Co alloys under various deposition conditions were investigated using atomic absorption spectroscopy for the determination of the chemical composition, atomic force microscopy for surface morphology analysis, and electrochemical impedance spectroscopy for determination of corrosion properties. The influence of the ratio of the alloying elements, [Co2+]/[Ni2+], in a chloride deposition solution, as well as the deposition current density, on the chemical content, morphology and corrosion properties of the ternary alloys was studied. The plating solutions used were with the sAMe overall metal concentration, free of additives and the deposition was realized at room temperature. It was shown that the deposition of the ternary alloy coatings was of anomalous type and that the ratio of nickel to cobalt ions in the plating solution, as well as the deposition current density, had a significant influence on the chemical composition and corrosion stability of these coatings. The presence of both Ni and Co was beneficial for their corrosion stability. It was shown that morphology and porosity were important factors in the corrosion stability of these coatings. The coating deposited from the solution with higher [Co2+]/[Ni2+] ratio at 8 A dm-2 was made up of the smallest crystalline aggregates, had a small surface roughness and porosity, and was with quite uniform distribution of agglomerates and it exhibited the best corrosion stability.

Keywords: electrodeposition; ternary alloy coatings; corrosion; EIS; AFM.

Full Article - PDF 540 kB Supplementary Material PDF 164 kB Available OnLine: 13. 11. 2014. Cited by

J. Serb. Chem. Soc. 80 (1) 87–96 (2015)

UDC 547.677.5+546.47+577.213.3:539.196+543.552; JSCS–4699; doi: 10.2298/JSC140218120H; Original scientific paper

Polarographic determination of DNA based on its interaction with the phenanthroline–zinc(II) complex

NI HUI, AIQIN LIANG, CHANGHUI XUE and WEI SUN*

College of Chemistry and Pharmacy, Qingdao Agriculture University, Qingdao 266109, P. R. China

*College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, 571158, P. R. China

(Received 18 February, revised 28 November, accepted 2 December 2014)

By using the linear sweep voltAMmetric technique, a phenanthroline (Phen) and zinc(II) (Phen–Zn(II)) complex was used as the electrochemical probe for the determination of double-stranded (ds) DNA. In pH 9.0 Britton–Robinson (B–R) buffer solution, Phen can interact with Zn(II) to form a stable electroactive [Phen–Zn(II)] complex, which had a sensitive second order derivative polarographic reductive peak at –1.300 V (vs. SCE). After the addition of dsDNA into a solution of Phen–Zn(II) complex, the reduction peak current decreased with a negative shift of the reduction peak potential and without the appearance of new peaks. The results showed that a new suprAMolecular complex was formed via interaction of the Phen–Zn(II) complex with dsDNA. The conditions of interaction and the electrochemical detection were carefully investigated. Under the optimum conditions, the decrease in the reduction peak current was directly proportional to the dsDNA concentration in the range of 0.4–18.0 mg L-1 with the linear regression equation: ΔIp″/nA = 349.48 + 84.647(c/mg L-1) (n = 13, γ = 0.991) and a determination limit of 0.20 mg L-1 (3σ). The relative standard deviation (RSD) for 10 parallel determinations of 10.0 mg L-1 dsDNA was found to be 2.03 %. The method was successfully applied to the detection of synthetic sAMples with satisfactory results.

Keywords: phenanthroline; zinc; DNA; interaction; linear sweep voltAMmetry.

Full Article - PDF 238 kB Available OnLine: 02. 12. 2014. Cited by

J. Serb. Chem. Soc. 80 (1) 97–106 (2015)

UDC 678.744:544.5+544.14+547.298.4; JSCS–4700; doi: 10.2298/JSC140317083Z; Original scientific paper

Influence of the AMount of poly(vinyl alcohol) on the in situ production of photo-crosslinked thioAMide functionalized nanofiber membranes

BIHTER ZEYTUNCU, MEHMET HAKAN MORCALI*, SULEYMAN AKMAN** and ONURALP YUCEL*

Istanbul Technical University, Applied Research Center of Materials Science and Production Technology, 34469, Istanbul, Turkey

*Istanbul Technical University, Faculty of Chemical and Metallurgical Engineering, 34469, Istanbul, Turkey

**Istanbul Technical University, Faculty of Science and Letters, Department of Chemistry, 34469, Istanbul, Turkey

(Received 17 March, revised 31 July, accepted 7 August 2014)

Poly(vinyl alcohol)/maleic anhydride/acryloyl thioAMide monomer (PVA/MA/ATM) photo-cured nanofiber membranes and pure PVA nanofiber membranes were produced by the electrospinning technique. In situ UV radiation was applied during the electrospinning in order to provide polymerization during the jet flight and promote crosslinking of ATM and MA with PVA. The cross-linking was exAMined by Fourier transform infrared spectroscopy (FTIR). The morphology of the electrospun nanofibers was characterized by scanning electron microscope (SEM). The surface area of the nanofiber membranes was measured by Brunauer–Emmert–Teller (BET) analysis. Furthermore, their water durability was exAMined. The water durability test demonstrated that the in situ photo-cured PVA/MA/ATM nanofiber membrane had the lowest average mass loss. The surface areas of PVA/MA/ATM nanofiber membranes were 160–280 m2 g-1. The surface area and diAMeter of PVA/MA/ATM nanofibers decreased with increasing PVA content. The diAMeter of the obtained nanofibers was less than 100 nm. The results showed that water-insoluble nanofiber membranes with good chemical and thermal resistance were obtained. These nanofiber membranes may be promising candidates for usage in water treatment.

Keywords: electrospinning; nanofiber membrane; poly(vinyl alcohol); photo-curable; thioAMide.

Full Article - PDF 484 kB Available OnLine: 07. 08. 2014. Cited by

J. Serb. Chem. Soc. 80 (1) 107–113 (2015)

UDC 548.15+546.57+551.312.1+544.654.2+621.385.833; JSCS–4701; doi: 10.2298/JSC140306045I; Original scientific paper

Randomly oriented twin domains in electrodeposited silver dendrites

EVICA R. IVANOVIĆ, NEBOJŠA D. NIKOLIĆ* and VELIMIR R. RADMILOVIĆ**

Faculty of Agriculture, University of Belgrade, Nemanjina 6, Belgrade-Zemun, Serbia

*ICTM – Institute of Electrochemistry, University of Belgrade, Njegoševa 12, P. O. Box 473, 11001 Belgrade, Serbia

**Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, P. O. Box 3503, 11001 Belgrade, Serbia

(Received 6 March, revised 16 April, accepted 18 April 2014)

Silver dendrites were prepared by electrochemical deposition. The structures of the Ag dendrites, the type of twins and their distribution were investigated by scanning electron microscopy (SEM), Z-contrast high angle annular dark field transmission electron microscopy (HAADF), and crystallographically sensitive orientation imaging microscopy (OIM). The results revealed that the silver dendrites were characterized by the presence of randomly distributed 180° rotational twin domains. The broad surface of dendrites was of the {111} type. The directions of growth of the main dendrite stem and all branches were of the <112> type.

Keywords: dendrite; silver; electrodeposition; twinning; scanning electron microscopy; high angle annular dark field microscopy; orientation imaging microscopy.

Full Article - PDF 271 kB Available OnLine: 18. 04. 2014. Cited by

J. Serb. Chem. Soc. 80 (1) 115–125 (2015)

UDC 63.875+665.944.7:66.099.72+628.3; JSCS–4702; doi: 10.2298/JSC140102041P; Original scientific paper

The feasibility of Cassia fistula gum with polyaluminum chloride for the decolorization of reactive dyeing wastewater

YUAN SHING PERNG and MANH HA BUI

Department of Environmental Engineering, Dayeh University, No.168, University Rd., Dacun, Changhua- 51591, Taiwan, China

(Received 2 January, revised 10 April, accepted 11 April 2014)

In order to find a new environmentally friendly coagulant that could partially replace conventional polyaluminum chloride (PAC), which was shown to be toxic to aquatic environments, gum extracted from the seeds of Cassia fistula Linn. (CF) was investigated for the decolorization of reactive dyes Blue 19 (RB19) and Black 5 (RB5) using jar-test experiments. The optimal results showed that crude CF gum did not achieve high degrees of decolorization of RB5 and RB19 when compared with PAC coagulant under the sAMe conditions. Whereas when CF gum was used in combination with PAC, decolorization efficiencies of both dyes reached over high values at 40 % volume fraction of gum. These results indicated the potential of using CF gum as a “green” coagulant or as a contributing factor to color removal in textile wastewater.

Keywords: coagulation; dye removal; natural coagulant; reactive blue 19; reactive black 5.

Full Article - PDF 202 kB Supplementary Material PDF 245 kB Available OnLine: 17. 10. 2014. Cited by

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