Vol 76, No 7 - Abstracts

JSCS Vol 76, No. 7

Whole issue - PDF 2,265 KB

J. Serb. Chem. Soc. 76 (7) 947–954 (2011)

UDC 547.26’11+547.418:544.412.1; JSCS–4173; doi: 10.2298/JSC100909066L; Original scientific paper

Facile and efficient conjugate additions of b-dicarbonyl compounds and nitroalkanes to 4-aryl-4-oxobut-2-enoates

XIN LV, YAOHONG ZHANG, LIEJIN ZHOU and XIAOXIA WANG

Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, P. R. China

(Received 9 September 2010, revised 3 January 2011)

Facile and efficient conjugate additions of carbon nucleophiles, such as b-dicarbonyl compounds and nitroalkanes, to 4-aryl-4-oxobut-2-enoates have been achieved under simple base catalysis. A variety of multi-functional g-keto esters could be conveniently obtained in good to excellent yields with complete regioselectivity.

Keywords: conjugate addition; multi-functional g-keto ester; b-dicarbonyl compound; nitroalkane; 4-aryl-4-oxobut-2-enoate.

Full Article - PDF 244 KB Supplementary Material PDF 157 K Available OnLine: 21. 04. 2011. Cited by

J. Serb. Chem. Soc. 76 (7) 955–963 (2011)

UDC 547.367+547.279.3+54–328+546.215:544.478; JSCS–4174; doi: 10.2298/JSC100904086S; Original scientific paper

H₅PV₂Mo₁₀O₄₀ as an efficient catalyst for the oxidation of thiols to the corresponding disulfides using hydrogen peroxide as the oxidant

ABDOLLAH FALLAH SHOJAEI, MOHAMAD ALI REZVANI and MAJID HERAVI*

Department of Chemistry, Faculty of Science, University of Guilan, Rasht, 419961-3769, Iran

*Department of Chemistry, School of Science, Alzzahra University, Vanak, Tehran, Iran

(Received 4 September 2010, revised 10 January 2011)

The H₅PV₂Mo₁₀O₄₀ catalyzed the oxidation of thiols to their homodisulfides using hydrogen peroxide as the oxidant under mild conditions is reported. This system provides an efficient, convenient and practical method for the syntheses of symmetrical disulfides. In this work, comparisons of Keggin and Dawson type polyoxometalates are addressed in term of relative stability, hardness and acidity.

Keywords: heteropolyacids; thiols; disulfides; hydrogen peroxide; Keggin type; polyoxometalate; Dawson.

Full Article - PDF 198 KB Available OnLine: 16. 06. 2011. Cited by

J. Serb. Chem. Soc. 76 (7) 965–972 (2011)

UDC 66.011+577.152.3+663.1:579.852; JSCS–4175; doi: 10.2298/JSC101010098B; Original scientific paper

Optimization of the growth of and a-AMylase production by Bacillus subtilis IP 5832 in shake flask and laboratory fermenter batch cultures

NATAŠA BOŽIĆ, JORDI RUIZ*, JOSEP LÓPEZ-SANTÍN* and ZORAN VUJČIĆ**

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

*DepartAMent d’Enginyeria Química, Escola d’Enginyeria, Unitat de Biocatàlisi Aplicada associada al IIQA (CSIC), Universitat Autònoma de Barcelona, Edifici Q, 08193-Bellaterra, Spain

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

(Received 25 October, revised 27 December 2010)

Cell growth and the level of a-AMylase in response to the carbon and nitrogen sources used for the growth of the strain Bacillus subtilis IP 5832 were exAMined. Based on the AMylase productivity level in shake flask cultures after 24 hours of growth, the growth medium containing starch and peptone was selected as the best medium. Amylase production was greatly reduced when glutAMate or citrate as sources of carbon were used. Experiments performed at different initial concentrations of starch showed that although the strain grew well with all the starch concentration used, 0.5 % starch was necessary for maximum a-AMylase production, inducing 1.55 IU mL^-1 of AMylase to be secreted after 8 h of cultivation in shaking flasks. During the batch fermentation of B. subtilis IP 5832 strain in 2 L laboratory fermenter, a 60 % higher activity (2.5 IU mL^-1) was obtained. The production of the enzyme was directly related to the growth of the strain. Maximum enzyme activity was obtained at the beginning of the stationary growth phase.

Keywords: growth; a-AMylase; Bacillus subtilis; fermenter; batch cultures

Full Article - PDF 329 KB Available OnLine: 29. 06. 2011. Cited by

J. Serb. Chem. Soc. 76 (7) 973–985 (2011)

UDC 547.972:544.032.6–31:615.27:544.4; JSCS–4176; doi: 10.2298/JSC101123089C; Original scientific paper

Effects of continuous UV-irradiation on the antioxidant activities of quercetin and rutin in solution in the presence of lecithin as the protective target

DRAGAN CVETKOVIĆ, DEJAN MARKOVIĆ, DRAGANA CVETKOVIĆ* and BLAGA RADOVANOVIĆ**

Faculty of Technology, 16000 Leskovac, Serbia

*Nevena Color, d.o.o, 16000 Leskovac, Serbia

**Faculty of Science, Department of Chemistry, 18000 Niš, Serbia

(Received 23 November 2010, revised 20 Januaty 2011)

The stabilities and antioxidant action of two selected flavonoids, quercetin and rutin, dissolved in methanol and water, toward continuous UV-irradiation from three different sub-ranges (UV-A, UV-B and UV-C) were studied. The flavonoids underwent degradation (bleaching) following first-order kinetics. The bleaching rates were highly dependent on the energy input of the involved UV-photons. The antioxidant activities of the two flavonoids on UV-induced lecithin lipid peroxidation were studied by the thiobarbituric acid–malondialdehyde (TBA–MDA) test, and appeared to be also affected by the continuous UV irradiation. The energy input of the incident UV-photons again played a major governing role, but an impact of the flavonoids structures cannot be neglected.

Key words: flavonoids; UV-irradiation; antioxidant; kinetics.

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J. Serb. Chem. Soc. 76 (7) 987–994 (2011)

UDC 582.293.378+634.22:543.613.3; JSCS–4177; doi: 10.2298/JSC101004087S; Short communication

SHORT COMMUNICATION

Volatile constituents of selected Parmeliaceae lichens

IGOR Ž. STOJANOVIĆ, NIKO S. RADULOVIĆ*, TATJANA Lj. MITROVIĆ**, SLAVIŠA M. STAMENKOVIĆ** and GORDANA S. STOJANOVIĆ*

Department of Pharmacy, Faculty of Medicine, University of Niš, Bul. Z. Đinđića 81, 18000 Niš, Serbia

*Department of Chemistry, Faculty of Science and Mathematics, University of Niš, Višegradska 33, 18000 Niš, Serbia

**Department of Biology and Ecology, Faculty of Science and Mathematics, University of Niš, Višegradska 33, 18000 Niš, Serbia

(Received 4 October, revised 27 December 2010)

The acetone soluble fraction of the methanol extracts of Parmeliaceae lichens: Hypogymnia physodes, Evernia prunastri and Parmelia sulcata, growing on the sAMe host tree (Prunus domestica) and at the sAMe locality was analyzed for the first time by GC and GC–MS. The major identified components were olivetol (33.5 % of the H. physodes extract), atraric acid (30.1 and 30.3 % of the E. prunastri and P. sulcata extracts, respectively), orcinol (25.0 % of the E. prunastri extract), vitAMin E (24.7 % of the P. sulcata extract) and olivetonide (15.7 % of the H. physodes extract). Even though all the identified compounds are known, a number of them were found for the first time in the exAMined lichens, i.e., orcinol monomethyl ether (H. physodes), orcinol, atranol, lichesterol, ergosterol (H. physodes and P. sulcata), methyl haematommate, atraric acid, olivetol, vitAMin E (H. physodes and P. sulcata) and b-sitosterol (P. sulcata).

Keywords: Hypogymnia physodes; Evernia prunastri; Parmelia sulcata; volatile constituents.

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J. Serb. Chem. Soc. 76 (7) 995–1001 (2011)

UDC 546.924+547.313.2+547.466.4+547.213–32:548.7; JSCS–4178; doi: 10.2298/JSC101025088G; Original scientific paper

Stereospecific ligands and their complexes. VI. The crystal structure of (S,S)-ethylenediAMine-N,N’-di-2-propanoic acid hydrochloride, (S,S)-H₂eddp•HCl

VERICA V. GLODJOVIĆ, GORDANA P. RADIĆ, SNEŽANA M. STANIĆ*, FRANK W. HEINEMANN** and SREĆKO R. TRIFUNOVIĆ

Department of Chemistry, Faculty of Science, University of Kragujevac, Radoja Domanovića 12, 34000 Kragujevac, Serbia

*Department of Biology, Faculty of Science, University of Kragujevac, Radoja Domanovića 12, 34000 Kragujevac, Serbia

**Department of Chemistry and Pharmacy, Inorganic Chemistry, Egerlandstrasse 1, D-91058 Erlangen, Germany

(Received 25 October, revised 23 December 2010)

(S,S)-EthylenediAMine-N,N’-di-2-propanoic acid hydrochloride, (S,S)-H₂eddp·HCl, was prepared and its crystal structure determined. The compound was characterized by infrared and ¹H- and ¹³C-NMR spectroscopy. It forms P1 in the space group of a triclinic crystal system with a = 5.3902(2) Å, b = 5.8967(2) Å, c = 10.3319(2) Å, a = 99.625(2)°, b = 91.645(2)°, g = 109.995(2)° and Z = 1.

Keywords: (S,S)-ethylenediAMine-N,N’-di-2-propanoate ligand; X-ray crystal structure, ¹H-NMR, ¹³C-NMR spectroscopy.

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J. Serb. Chem. Soc. 76 (7) 1003–1014 (2011)

UDC 661.1.001.5:544.02:615.01; JSCS–4179; doi: 10.2298/JSC101104091F; Original scientific paper

Estimation of the volume of distribution of some pharmacologically important compounds from their structural descriptor

MOHAMMAD H. FATEMI and ZAHRA GHORBANNEZHAD

Chemometrics Laboratory, Faculty of Chemistry, University of Mazandaran, Babolsar, Iran

(Received 4 November 2010)

Quantitative structure–activity relationship (QSAR) approaches were used to estimate the volume of distribution (V_d) using an artificial neural network (ANN). The data set consisted of the volume of distribution of 129 pharmacologically important compounds, i.e., benzodiazepines, barbiturates, nonsteroidal anti-inflAMmatory drugs (NSAIDs), tricyclic anti-depressants and some antibiotics, such as betalactAMs, tetracyclines and quinolones. The descriptors, which were selected by stepwise variable selection methods, were: the Moriguchi octanol–water partition coefficient; the 3D-MoRSE-signal 30, weighted by atomic van der Waals volumes; the fragment-based polar surface area; the d COMMA2 value, weighted by atomic masses; the Geary autocorrelation, weighted by the atomic Sanderson electronegativities; the 3D-MoRSE – signal 02, weighted by atomic masses, and the Geary autocorrelation – lag 5, weighted by the atomic van der Waals volumes. These descriptors were used as inputs for developing multiple linear regressions (MLR) and artificial neural network models as linear and non-linear feature mapping techniques, respectively. The standard errors in the estimation of V_d by the MLR model were: 0.104, 0.103 and 0.076 and for the ANN model: 0.029, 0.087 and 0.082 for the training, internal and external validation test, respectively. The robustness of these models were also evaluated by the leave-5-out cross validation procedure, that gives the statistics Q² = 0.72 for the MLR model and Q² = 0.82 for the ANN model. Moreover, the results of the Y-randomization test revealed that there were no chance correlations AMong the data matrix. In conclusion, the results of this study indicate the applicability of the estimation of the V_d value of drugs from their structural molecular descriptors. Furthermore, the statistics of the developed models indicate the superiority of the ANN over the MLR model.

Keywords: quantitative structure–activity relationship; molecular descriptor; volume of distribution; artificial neural network.

Full Article - PDF 220 KB Supplementary Material PDF 131 K Available OnLine: 16. 06. 2011. Cited by

J. Serb. Chem. Soc. 76 (7) 1015–1026 (2011)

UDC 544.421.032.4:546.32’82+547.461.2:543.57; JSCS–4180; doi: 10.2298/JSC100615083M; Original scientific paper

Thermal decomposition of potassium titanium oxalate

KARUVANTHODI MURALEEDHARAN and LABEEB PASHA

Department of Chemistry, University of Calicut, Kerala, 673 635, India

(Received 15 June, revised 14 December 2010)

The thermal decomposition of potassium titanium oxalate (PTO) was studied using non-isothermal thermogravimetry at different heating rates under a nitrogen atmosphere. The thermal decomposition of PTO proceeds mainly through five stages forming potassium titanate. The theoretical and experimental mass loss data are in good agreement for all stages of the thermal decomposition of PTO. The third thermal decomposition stage of PTO, the combined elimination of carbon monoxide and carbon dioxide, were subjected to kinetic analyses both by the method of model fitting and by the model free approach, which is based on the isoconversional principle. The model free analyses showed that the combined elimination of carbon monoxide and carbon dioxide and formation of final titanate in the thermal decomposition of PTO proceeds through a single step with an activation energy value of about 315 kJ mol^-1.

Keywords: potassium titanium oxalate; non-isothermal thermogravimetry; decomposition kinetics; model free methods.

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J. Serb. Chem. Soc. 76 (6) 1027–1035 (2011)

UDC 669.112.227/.228:620.193:669.14.018.8:621.791; JSCS–4181; doi: 10.2298/JSC100726090R; Original scientific paper

Corrosion of an austenite and ferrite stainless steel weld

VLADANA N. RAJAKOVIĆ-OGNJANOVIĆ and BRANIMIR N. GRGUR*

Institute of Hydraulic and Environmental Engineering, Faculty of Civil Engineering, University of Belgrade, Bulevar kralja Aleksandra 73, 11 000 Belgrade, Serbia

*Department of Physical Chemistry and Electrochemistry, Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11 000 Belgrade, Serbia

(Received 26 July, revised 25 December 2010)

Dissimilar metal connections are prone to frequent failures. These failures are attributed to the difference in the mechanical properties across the weld, the coefficients of thermal expansion of the two types of steels and the resulting creep at the interface. For the weld analyzed in this research, it was shown that corrosion measurements can be used for a proper evaluation of the quality of weld material and for the prediction of whether or not the material, after the applied welding process, can be in service without failures. It was found that the corrosion of the weld analyzed in this research resulted from the simultaneous activity of different types of corrosion. In this study, electrochemical techniques including polarization and metallographic analysis were used to analyze the corrosion of a weld material of ferrite and austenitic stainless steels. Based on surface, chemical and electrochemical analyses, it was concluded that corrosion occurrence was the result of the simultaneous activity of contact corrosion (ferrite and austenitic material conjuction), stress corrosion (originating from deformed ferrite structure) and inter-granular corrosion (due to chromium carbide precipitation). The value of corrosion potential of –0.53 V shows that this weld, after the thermal treatment, is not able to repassivate a protective oxide film.

Keywords: welding; corrosion; stainless steel.

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J. Serb. Chem. Soc. 76 (7) 1037–1047 (2011)

UDC 628.193:582.522+544.723+544.4; JSCS–4182; doi: 10.2298/JSC100628084L; Original scientific paper

Biosorption of lead contAMinated wastewater using cattails (Typha angustifolia) leaves: kinetic studies

YEN LING SHARAIN-LIEW, COLLIN G. JOSEPH and SIEW-ENG HOW

Industrial Chemistry ProgrAMme, School of Science and Technology, University of Malaysia Sabah, Locked Bag No. 2073, 88999, Sabah, Malaysia

(Received 28 June, revised 27 September 2010)

In this work, dried leaves of Typha angustifolia (TA), also known as the common cattail, were used as an adsorbent in kinetic studies of Pb(II) adsorption from synthetic aqueous solutions. Batch adsorption studies with dried TA leaves were conducted and they were able to adsorb Pb(II) from 100 mL of a 25 mg L^-1 Pb(II) solution effectively with the optimized dosage of 0.6 g. Adsorption equilibrium was achieved within 8 h with an effective removal of 86.04 %. Adsorption kinetics was further evaluated using four kinetic models, i.e., the pseudo-first order, pseudo-second order, intraparticle diffusion and Elovich model. Fitting of the data was performed based on linear regression analysis. The sorption kinetic data fitted best to the pseudo-second order model with an R² of 0.9979, followed closely by the Elovich model with an R² of 0.9952. The obtained results showed the adsorption of Pb(II) by TA leaves, which is an abundant biological material, is feasible, cheap and environmentally friendly.

Keywords: adsorption; lead; kinetics; Typha angustifolia.

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J. Serb. Chem. Soc. 76 (7)1049–1055 (2011)

UDC 546.86’226+621.315.59:544.526.5:667.287.6; JSCS–4183; doi: 10.2298/JSC100425082A; Short communication

SHORT COMMUNICATION

Photodegradation of Naphthol green B in the presence of semiconducting antimony trisulphide

RAKSHIT AMETA, Pinki Bala PUNJABI* and SURESH C. AMETA*

Department of Pure &AMp; Applied Chemistry, University of Kota, Kota - 324010 (Rajasthan) India

*Department of Chemistry, M. L. Sukhadia University, Udaipur -313002 (Rajasthan) India

(Received 25 April, revised 24 June 2010)

Different methods of wastewater treatment are being used for the removal of dyes from their solution, but in most of the cases, either homogeneous catalysts or different adsorbents are used. These methods have their own merits and demerits. In the present work, antimony trisulphide was used as a heterogeneous catalyst. The effects of different parAMeters on the rate of the reaction were observed, such as pH, concentration of dye, AMount of semiconductor and light intensity. A tentative mechanism is proposed in which the role of hydroxyl radical as an active oxidizing species is shown for degradation of Naphthol green B.

Keywords: semiconductor; photocatalyst; Naphthol Green B; hydroxyl radical; antimony trisulphide.

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