Vol 77, No 7 - Abstracts

JSCS Vol 77, No. 7

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Whole issue - PDF 3.992 KB

J. Serb. Chem. Soc. 77 (7) 859–866 (2012)

UDC 547.814+547.853+66.095.3:615.281.004.12; JSCS–4314; doi: 10.2298/JSC110923008M; Original scientific paper

Synthesis and characterization of new 2-AMino-4-(3,4-dihydro-7-methoxy-2,2-dimethyl-2H-benzopyran-6-yl)-6-(substituted phenyl)pyrimidines and their bioevaluation

YELLAJYOSULA LAKSHMI NARASIMHA MURTHY, KILARU PADMA SUHASINI and ANJALI JHA*

Department of Organic Chemistry, Andhra University, VisakhapatnAM, India

*Department of Chemistry, GitAM Institute of Science, GITAM University, VisakhapatnAM, India

(Received 23 September 2011, revised 22 January 2012)

A series of eight novel 2-AMino-4-(3,4-dihydro-7-methoxy-2,2-dimethyl-2H-benzopyran-6-yl)-6-(substituted phenyl)pyrimidines were designed and synthesized by utilizing benzene-1,3-diol as the starting material. The structures of the isolated products (6a–h) were established through 1H-NMR, 13C-NMR, and FT-IR spectroscopic techniques and elemental analysis. The antimicrobial properties of the synthesized compounds were screened against grAM positive (Bacillus pumilus, Bacillus subtilis and Streptococcus faecalis), grAM negative bacteria (Enterococcus faecalis, Escherchia coli and Proteus vulgaris) and fungi (Pencillium expansum, Aspergillus niger and Candida albicans) using AMpicillin and ketoconazole as reference compounds. Most of the compounds showed moderate to high antibacterial and antifungal activities against the studied strains, with inhibition zones between 8 and 30 mm.

Keywords: benzopyran; chalcones; Claisen–Schmidt condensation; 2-AMino pyrimidine derivatives; antimicrobial activity.

Full Article - PDF 211 KB Supplementary Material PDF 166 KB Available OnLine: 01. 02. 2012. Cited by

J. Serb. Chem. Soc. 77 (7) 867–871 (2012)

UDC 547.7+547–304.9+66.095.25:542.913:535.33.004.12; JSCS–4315; doi: 10.2298/JSC110930217G Short communication

SHORT COMMUNICATION

Synthesis and spectral properties of novel thiadiazolotriazinone derivatives

DEMET GÜRBÜZ and SÜLEYMAN TANYOLAÇ

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

(Received 30 September, revised 7 December 2011)

Abstract: A series of new 7-substitued-4H-1,3,4-thiadiazolo[2,3-c][1,2,4]-triazin-4-ones were synthesized in good yields by the reaction of 4-AMino-3-mercapto-1,2,4-triazin-5(4H)-one with various aromatic carboxylic acids in the presence of phosphorus oxychloride. All the synthesized compounds were confirmed by FT-IR, NMR (1H and 13C) and ESI-MS spectroscopic techniques and analytical methods.

Keywords: heterocyclic; 1,2,4-triazine; cyclization; thiadiazolotriazinones.

Full Article - PDF 150 KB Supplementary Material PDF 437 KB Available OnLine: 22. 12. 2011. Cited by

J. Serb. Chem. Soc. 77 (8) 873–877 (2012)

UDC 547.324+547.261+546.814:543.422.25; JSCS–4316; doi: 10.2298/JSC111215007D; Note

NOTE

Reaction of (iodomethyl)tin(IV) compounds with (2S)-2,5-dihydro-2-isopropyl-3,6-dimethoxy-pyrazine

KARIN DÖLLING

Biozentrum, Martin-Luther-Universität Halle, 06099 Halle, Germany

(Received 15 December 2011, revised 24 January 2012)

Following the Schöllkopf methodology, the reaction of (2S)-2,5-dihydro-2-isopropyl-3,6-dimethoxy-pyrazine 1 with (iodomethyl)trimethylstannane gives (2S,5S)-2,5-dihydro-2-isopropyl-3,6-dimethoxy-5-[(trimethylstannyl)methyl]pyrazine 2 in good yields. The obtained compound was characterized by elemental analysis and multinuclear (1H, 13C and 119Sn)-NMR spectroscopy.

Keywords: Schöllkopf reaction; 2,5-dihydro-2-isopropyl-3,6-dimethoxy-pyrazine; stannylmethylation; NMR-spectroscopy.

Full Article - PDF 165 KB Available OnLine: 26. 01. 2012. Cited by

J. Serb. Chem. Soc. 77 (7) 879–886 (2012)

UDC 638.16+615.33:66.022.362; JSCS–4317; doi: 10.2298/JSC111002214C Original scientific paper

Stability of tetracycline residues in honey

MONICA CRISTINA CARA, GABRIELA-ALINA DUMITREL*, MIREL GLEVITZKY** and DELIA PERJU*

Sanitary-Veterinary and Food Safety Directorate of Timis County, Martir Caceu No.4, 300585, Timişoara

*Politehnica University of Timişoara, Faculty of Industrial Chemistry and Environmental Engineering, 2 Victoriei Square, 300006, Timişoara,

**Sanitary-Veterinary and Food Safety Directorate of Alba County, 7A Lalelelor Street, 510217 Alba Iulia, Romania

(Received 2 October, revised 14 December 2011)

The problem of the availability of veterinary medicines to treat honeybees is discussed extensively worldwide. An uncontrolled administration of antibiotics may lead to contAMination of beehive products and contribute to the problem of food safety. In this study, the kinetics of tetracycline (TC) degradation in honey was studied for sAMples provided by four beekeepers located in the west region of Romania. The sAMples of honey were stored in the dark at room temperature for 30 days and sub-sAMples were analyzed every 3 days by the Elisa method. The results of the study revealed that the level of tetracycline decreased with time in all the honey sAMples. The tetracycline degradation followed a first-order kinetic model with reaction rate constants between 1.2´103–2´103 days-1. The half-life time, τ1/2, of tetracycline in monofloral honeys: acacia and lime was 251 and 232 days, respectively. Tetracycline degradation in the polyfloral honey was accelerated, exhibiting a τ1/2 of 151 days.

Keywords: honey; antibiotics; storage; degradation; kinetics.

Full Article - PDF 211 KB Available OnLine: 16. 12. 2011. Cited by

J. Serb. Chem. Soc. 77 (7) 887–898 (2012)

UDC 535.563:532.74+519.6:544.351; JSCS–4318; doi: 10.2298/JSC110905207Y; Original scientific paper

Calculations of optical rotation: Influence of molecular structure

JIA YU, YU CAO, HANG SONG, XIANLONG WANG*,**and SHUN YAO

School of Chemical Engineering, Sichuan University, Chengdu 610065, China

*School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu 610054, China

**Department of Chemistry, Bryn Mawr College,101 N Merion Ave, Bryn Mawr, PA 19010, USA

(Received 5 September 2011)

The ab initio Hartree–Fock (HF) method and the Density Functional Theory (DFT) were used to calculate the optical rotation of 26 chiral compounds. The effects of the theory and basis sets used for the calculation, the influence of the solvent on the geometry and the values of the calculated optical rotation are all discussed. The polarizable continuum model, included in the calculation, did not improve the accuracy effectively, but was superior to γs. The optical rotation of five- and six-membered cyclic compounds was calculated and 17 pyrrolidine or piperidine derivatives, which were calculated by the HF and DFT methods, gave acceptable predictions. The nitrogen atom drAMatically affected the calculation results and it is necessary in the molecular structure in order to obtain an accurate computation result. NAMely, when the nitrogen atom was substituted by an oxygen atom in the ring, the calculation result deteriorated.

Keywords: ab initio; chiral molecules; molecular structure; optical rotation; solvent effect.

Full Article - PDF 268 KB Supplementary Material PDF 230 KB Available OnLine: 24. 11. 2012. Cited by

J. Serb. Chem. Soc. 77 (7) 899–910 (2012)

UDC 544.6:543+546.817+546.6.076.32:543.552:543.554; JSCS–4319; doi: 10.2298/JSC110830210M; Original scientific paper

Nanomolar determination of Pb(II) ions using a selective templated electrode

MOHAMMAD MAZLOUM-ARDAKANI, MOHAMMAD KAZEM AMINI*, MARZIEH DEHGHAN**, ELHAM KORDI** and MOHAMMAD ALI SHEIKH-MOHSENI

Department of Chemistry, Faculty of Science, Yazd University, Yazd, I. R. Iran

*Department of Chemistry, University of Isfahan, Isfahan, I. R. Iran

**Department of Chemistry, PayAM Noor University, Ardakan Center, Ardakan, I. R. Iran

(Received 30 August, revised 5 December 2011)

A polypyrrole-modified electrode, prepared by electro-polymerization of pyrrole in the presence of methyl red as a dopant, was templated with respect to Pb2+ and applied for the potentiometric and voltAMmetric detection of this ion. The templating process improved the analytical response characteristics of the electrode, especially its selectivity with respect to Pb2+. The improvement depended on both the incorporated ligand (dopant) and the templating process, with the latter being more vital. The potentiometric response of the electrode was linear within the Pb2+ concentration range of 2.0×10-6 to 5.0×10-2 M with a near-Nernstian slope of 28.6 mV dec-1 and a detection limit of 7.0×10-7 M. The electrode was also used for pre-concentration differential pulse anodic stripping voltAMmetry (DPASV) and the results showed that the peak currents for the incorporated lead species were dependent on the metal ion concentration in the range 1.0×10-8 to 1.0×10-3 M. The detection limit of the DPASV method was 3.5×10-9 M. The selectivity of the electrode with respect to some transition metal ions was investigated. The modified-templated electrode was used for the successful assay of lead in two standard reference material sAMples.

Keywords: templated polymers; lead; polypyrrole; potentiometry; voltAMmetry; nanomolar.

Full Article - PDF 271 KB Available OnLine: 07. 12. 2011. Cited by

J. Serb. Chem. Soc. 77 (7) 911–917 (2012)

UDC 546.13+633.71-32+632.951:543.4/.5; JSCS–4320; doi: 10.2298/JSC110617015G; Note

NOTE

Derivative spectrophotometric determination of acetAMiprid
in the presence of 6-chloronicotinic acid

VALÉRIA J. GUZSVÁNY, SANJA D. LAZIĆ*, NATAŠA VIDAKOVIĆ and ZSIGMOND J. PAPP

Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad, Trg D. Obradovića 3, 21000 Novi Sad, Serbia

*Faculty of Agriculture, University of Novi Sad, Trg D. Obradovića 8, 21000 Novi Sad, Serbia

(Received 17 June 2011, revised 10 February 2012)

A simple first-order derivative spectrophotometric method was developed for the simultaneous determination of acetAMiprid and 6-chloronicotinic acid (6-CNA) at pH 7.0. By using the zero-crossing approach, acetAMiprid was determined at 269.0 nm and 6-CNA at 216.0 nm with detection limits of 7.19´10-7 and 8.25´10-7 mol dm-3, respectively, and relative standard deviations not exceeding 1.2 % in the case of model systems.

Keywords: derivative spectrophotometry; acetAMiprid; 6-chloronicotinic acid.

Full Article - PDF 264 KB Available OnLine: 13. 02. 2012. Cited by

J. Serb. Chem. Soc. 77 (7) 919–935 (2012)

UDC 678.664’84+678.674:66.095.26: 532.14:536.5.004.12; JSCS–4321; doi: 10.2298/JSC111013006P Original scientific paper

Poly(urethane–siloxane)s based on hyperbranched polyester as crosslinking agent: synthesis and characterization

MARIJA V. PERGAL, JASNA V. DŽUNUZOVIĆ, SANJA OSTOJIĆ*, MIODRAG M. PERGAL**, ALEKSANDRA RADULOVIĆ* and SLOBODAN JOVANOVIĆ***

University of Belgrade, Institute of Chemistry, Technology and Metallurgy, Studentski trg 12–16, Belgrade 11000, Serbia

*University of Belgrade, Institute of General and Physical Chemistry, Studentski trg 12–16, Belgrade 11000, Serbia

**University of Belgrade, Faculty of Chemistry, Studentski trg 12–16, Belgrade 11000, Serbia

***University of Belgrade, Faculty of Technology and Metallurgy, Karnegijeva 4, Belgrade 11000, Serbia

(Received 13 October, revised 28 December 2011)

A series of novel polyurethane crosslinked structures (PUs) was prepared from α,ω-dihydroxy-(ethylene oxide–poly(dimethylsiloxane)–ethylene oxide) (EO–PDMS–EO), 4,4’-methylenediphenyl diisocyanate and Boltorn® hyperbranched polyester of the third pseudo generation. The hydroxy-functional hyperbranched aliphatic polyester with 26 end groups was used as a crosslinking agent. In order to improve the compatibility of all the reactants during the synthesis, the PU sAMples were prepared by two-stage, step-growth polymerization in solution. The content of the soft EO–PDMS–EO segments was varied in the range from 15 to 40 wt. %. The influence of the EO–PDMS–EO content on the swelling behavior, crosslink density, hardness, and the thermal and surface properties of the synthesized PUs was investigated. The structure of the synthesized polyurethanes was confirmed by the presence of specific bands in the Fourier transform infrared spectra. Swelling studies were performed to determine the crosslink density and polyurethane networks with lower EO–PDMS–EO contents had higher crosslink densities. The glass transition temperature of the synthesized PUs, determined by differential scanning calorimetry, slightly increased from 50 to 58 °C on decreasing the EO–PDMS–EO content because of the higher crosslink density of the sAMples. Increasing the EO–PDMS–EO content led to better thermal stability, as was evidenced by the onset temperature of weight loss. The surface of the polyurethane networks becAMe more hydrophobic with increasing EO–PDMS–EO content. The surface morphology of synthesized polyurethanes was analyzed by scanning electron microscopy.

Keywords: polyurethane networks; hyperbranched polyester; poly(dimethylsiloxane); crosslink density; thermal properties; surface properties.

Full Article - PDF 1,073 KB Available OnLine: 20. 01. 2012. Cited by

J. Serb. Chem. Soc. 77 (7) 937–944 (2012)

UDC 66.017:510.644:669.14:669–122; JSCS–4322; doi: 10.2298/JSC111115011B Original scientific paper

Application of a Bayesian Artificial Neural Network and the Reversible Jump Markov Chain Monte Carlo Method to predict the grain size of hot strip low carbon steels

MOHSEN BOTLANI-ESFAHANI and MOHAMMAD REZA TOROGHINEJAD*

Department of Materials Engineering, Lenjan Branch, IslAMic Azad University,
Isfahan, Iran

*Department of Materials Engineering, Isfahan University of
Technology, Isfahan, 84156-83111, Iran

(Received 11 November 2011, revised 31 January 2012)

An Artificial Neural Network (ANN) with Reversible Jump Markov Chain Monte Carlo (RJMCMC) simulation was used to predict the grain size of hot strip low carbon steels, as a function of steel composition. The results show good agreement with experimental data taken from the Mobarakeh Steel Company (MSC). The developed model is capable of recognizing the role and importance of elements in grain refinement. Furthermore, the effects of these elements, including manganese, silicon and vanadium, were investigated in the present study, which were in good agreement with the literature.

Keywords: artificial neural network; grain size; hot strip; low carbon steel.

Full Article - PDF 568 KB Available OnLine: 05. 02. 2012. Cited by

J. Serb. Chem. Soc. 77 (7) 945–957 (2012)

UDC 533.6.011+537.872:519.6:536.7; JSCS–4323; doi: 10.2298/JSC110708014B; Original scientific paper

Numerical analysis and field study of the time-dependent exergy–energy of a gas–steAM combined cycle

BAMDAD BARARI, ASHKAN ABBASIAN SHIRAZI, MOHSEN KESHAVARZI and IMAN ROSTAMSOWLAT*

Mechanical Engineering Department, Shiraz University, Shiraz, Iran

*Mechanical Engineering Department, IslAMic Azad University, Kazeroon branch, Kazeroon, Iran

(Received 8 July 2011, revised 9 February 2012)

In this study, a time-dependent exergy analysis of the Fars Combined Power Plant Cycle was considered. The exergy analysis was used to investigate each part of the actual combined cycle by considering irreversibility from April 2006 to October 2010. Performance analysis was performed for each part by evaluating the exergy destruction in each month. By use of the exergy analysis, the aging of each part was evaluated with respect to time. In addition, the rate of lost work for each month was calculated and the variation of this parAMeter was considered as a function of aging rate. Finally, the effect of exergy destruction of each part on the exergy destruction of the whole cycle was investigated. The entire analysis was realized for Unit 3 and 4 of the gas turbine cycle that combine with Unit B of the steAM cycle in the Fars Combined Power Plant Cycle located in the Fars Province in Iran.

Keywords: exergy analysis; exergy loss; combined power plant.

Full Article - PDF 370 KB Supplementary Material PDF 762 KB Available OnLine: 10. 02. 2012. Cited by

J. Serb. Chem. Soc. 77 (7) 959–970 (2012)

UDC 546.56’47’711’72’76:504.53:581.5(497.11)(23.0); JSCS–4324; doi: 10.2298/JSC111225221Z; Original scientific paper

Heavy metal contents in Veronica species and soil from mountainous areas in Serbia

JELENA ŽIVKOVIĆ, SLAVICA RAŽIĆ*, JELENA ARSENIJEVIĆ** and ZORAN MAKSIMOVIĆ**

Institute for Medicinal Plant Research “Dr. Josif Pančić”, Belgrade, Serbia

*Department of Analytical Chemistry, School of Pharmacy, University of Belgrade, Belgrade, Serbia
**Department of Pharmacognosy, School of Pharmacy, University of Belgrade, Belgrade, Serbia

(Received 25 December 2011)

This paper describes the relationships between the concentrations of selected trace elements in soil and their bioaccumulation in the aerial parts of three Veronica species (Plantaginaceae). Plant and soil sAMples were collected from three mountainous areas in Serbia, prepared by microwave-assisted acid digestion and analyzed by flAMe and flAMeless atomic absorption spectrometry. The total concentrations of Cu, Zn, Mn, Fe and Cr in the soil varied from 12.38 to 47.77, 62.78 to 138.00, 517.58 to 1675.78, 13574.22 to 35920.00 and 36.18 to 115.15 mg kg-1, respectively, while those in the plants ranged from 6.04 to 12.8, 27.66 to 58.01, 25.38 to 89.25, 35.53 to 563.26 and 0.44 to 18.96 mg kg-1, respectively. There were no significant differences in heavy metal concentrations between the tested Veronica species from the sAMe location, indicating that their heavy metal uptake pattern was not species specific. In the case of Mn, despite its wide variation in the soil, the concentrations in the plant sAMples were uniform, which suggests the potential ability of the tested species to control Mn uptake and/or its translocation to the upper plant parts. Additionally, the lowest concentrations of Cu were obtained in plant sAMples collected from soil with the highest Fe concentrations, indicating that Cu availability to plants might be reduced due to high Fe contents in soil solution.

Keywords: atomic absorption spectroscopy; correlation analysis; trace elements; soil; plants.

Full Article - PDF 206 KB Available OnLine: 27. 12. 2011. Cited by

J. Serb. Chem. Soc. 77 (7) 971–981 (2012)

UDC 631.85+631.454+631.8+631.42; JSCS–4325; doi: 10.2298/JSC110927208A; Original scientific paper

Fractionation of soil phosphorus in a long-term phosphate fertilization

NASSER RAMDAN AMAIZAH, DRAGAN ČAKMAK*, ELMIRA SALJNIKOV*, GORAN ROGLIĆ, VESNA MRVIĆ*, RADA KRGOVIĆ* and DRAGAN MANOJLOVIĆ

Faculty of Chemistry, University of Belgrade, Studentski trg 12–16, 11000 Belgrade, Serbia

*Institute of Soil Science, Teodora Drajzera 7, 11000, Belgrade, Serbia

(Received 27 September, revised 28 November 2011)

The changes in inorganic and organic phosphorus (P) fractions of soil resulting from long-term fertilization (40 years) were investigated. In order to improve understanding of the sink and sources of phosphorus, P-fractions were extracted from soil sAMples from depths of 0–30 and 30–60 cm with different AMounts of monoAMmonium-phosphate (MAP) and then determined. The studied soil was of the Stagnosol type. Phosphate fertilizer was applied in 26, 39 and 52 kg P ha-1 AMounts during a period of 40 years. SAMples were subjected to sequential extraction according to a modified Chang and Jackson method and the Community Bureau of Reference (BCR) sequential extraction procedure in order to extract different forms of phosphorus. The certified reference material CRM 684 (river sediment extractable phosphorus) was used to confirm the accuracy of the instrument and of both employed methods. Furthermore, the association of phosphorus with substrates was provided by comparison of the results of sequential methods of phosphorus species with the sequential extraction of metals (Fe, Al, Mn and Ca). The results of continuous fertilization during 40 years indicated increases of all forms phosphorus in the soil except of phosphorus bound to calcium and organic phosphorus. Application of higher AMounts of P-fertilizer resulted in the dominance of the Al–P fraction in the studied soil, which indicated that this fraction was the most responsible for the migration of phosphorus along the soil profile.

Keywords: phosphorus; soil fertilization; sequential extraction; CRM 684.

Full Article - PDF 695 KB Available OnLine: 30. 11. 2011. Cited by

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