JSCS Vol 66, No. 5

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J.Serb.Chem.Soc. 66(5)289-295(2001)
UDC 66.5.382
Original scientific paper

Selective desulfonylation in D-xylofuranose 3,5-disulfonates


Institute of Chemistry, Faculty of Science, University of Novi Sad, trg Dositeja Obradovica 3, 21000 Novi Sad, Yugoslavia

(Received 4 December 2000)
Amethod for the preparation of D-xylofuranose derivatives with a free terminal (C5) alcohol function was developed, starting from monocyclohexylidene-3,5-disulfonyl-
or 5-O-sulfonyl-3-O-methyl ester. The regioselective displacement of the C5 sulfonyl ester functionwith acetate ion in dimethylsulfoxide afforded the corresponding
5-O-acetyl-1,2-O-cyclohexylidene-3-O-sulfonyl or 5-O-acetyl-3-O-methyl-a -D-xylofuranose. These esters could be readily hydrolysed into the desired 1,2,3-trisubstituted
Keywords: D-xylofuranose, sulfonyl ester, nucleophilic substitution, desulfonylation
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J.Serb.Chem.Soc. 66(5)297–308(2001)
UDC 553.98
Original scientific paper

An organic geochemical correlation study of some Drmno depresssion crude oils
(southern part of the Pannonian Basin, Yugoslavia)


*Faculty of Chemistry, University of Belgrade, P.O. Box 158, YU-11001 Belgrade,
*ICTM-Center of Chemistry, P.O. Box 815, YU-11001 Belgrade,
*Federal Institute for Geosciences and Natural Resources, P.O. Box 510153, Hannover, Germany and
*Faculty of Mining and Geology, University of Belgrade, Belgrade, Yugoslavia

(Received 8 January 2001)
The results of an investigation of crude oils originating from the Sirakovo and Bradarac-Maljurevac localities (southern part of the Pannonian Basin) are reported in this paper. The aim was to estimate the organic geochemical similarity of the crude oils from the Drmno (Kostolac) depression oil fields. The nine selected samples originated from reservoir rocks of various depths. Reliable source and organic geochemical maturation parameters served as the basis for the correlation studies. The similar origin of the investigated Drmno depression crude oils was corroborated, characterized by a significant participation of terrestrial precursor biomass. They were shown to be of relatively low maturity and to have been formed during the earlier stages of the diagenet- ic-catagenetic sequence of processes leading to the formation of crude oils, most probably in source rocks ofTertiary age, corresponding to vitrinite reflectances between Ro = 0.70 % and Ro = 0.80 %. The crude oils from Bradarac-Maljurevac seemed to be somewhat less homogeneous with respect to organic geochemical parameters compared to Sirakovo crude oils.
Keywords: crude oils, Drmno (Kostolac) depression, correlation parameters, source, maturation, age.
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J.Serb.Chem.Soc. 66(5)309–322(2001)
UDC 668.814.1
Original scientific paper

Photolysis of incorporated benzophenone derivatives inside compressed lipid monolayers


Faculty of Technology, YU-16000 Leskovac, Yugoslavia

(Received 4 July 2000)
The goal of this work was to study the possibility of the occurrence of radical-type lipid peroxidation of the lipid constituents on biomembranes, in compressed monolayers, having lipoidal benzophenone photosensitizers incorporated. The triplets of the photosensitizer abstract allylic and doubly-allylic hydrogen atoms from anticonjugated moities of the lipid molecules. The results simultaneously confirmed the occurrence of H-abstraction (and so the initiation of the peroxidizing chain mechanism), and the absence of the formation of lipid peroxides. The reason lies in "cage effect": the highly restricted spacial area of compressed lipid monolayers limits the mobility of the created radicals (lipid radicals and ketyl radicals) and leads to their recombination, thus preventing the propagation step of the chain mechanism. With certain reservations it may be concluded that these results have a clear implication on real biomembranes: the structure of which is one of themain factors preventing the spread of the chain reaction, and the formation of lipid peroxides.
Keywords: free radicals, lipid peroxidation, photosensitizers, benzophenone, monolayers.
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J.Serb.Chem.Soc. 66(5)323–330(2001)
UDC IgG hyman, 546.668
Original scientific paper

Two new murine monoclonal antibodies rised against human IgG


Institute for Immunology and Virology “Torlak”, Vojvode Stepe 458, YU-11221 Belgrade and
*Faculty of Chemistry, University of Belgrade, Studentski trg 16, YU-11000 Belgrade, Yugoslavia

(Received 24 November 2000)
Many pathological conditions are accompanied with changes in the concentration of the total IgG or some of its fraction. For this reason there is great interest in the production of reagents specific for IgG. In this paper, the binding characteristics of two new murine monoclonal antibodies (MoAb), assigned MoAb 15 and MoAb 22, are reported. These MoAbs were produced by hybridoma technology. By performing ELISAs and Western blots analyzes, it was demonstrated that both MoAbs interact specifically with human IgG. Cross reactivity with other sera proteins was not observed. In order to precisely localize the epitopes recognized by MoAb 15 and MoAb 22, the Western blots interactions of these MoAbs with electrophoreticaly separated IgG-fragments, obtained by the action of proteolytic enzymes (papain, pepsin, trypsin), were analyzed. According to the results of these experiments, both MoAbs interacted with epitopes in the Cg3 domain. The affinity constants, calculated from Scatchard plots of binding of MoAb15 and MoAb22 to human IgG, were Ka15 = 1.71×106 M-1 and Ka22 = 2.15×109 M-1. According to all these findings, MoAb 15 and MoAb 22 could be used in standard immunochemical techniques. However, the experiments showed that both MoAbs had bad immunoprecipitating properties. In solid  phase techniques (ELISAs, Western blot, dot-blot, etc.), their application gave excellent results that highly recommended them for use in these types of analyzes.
Keywords: human IgG, affinity constant, murine monoclonal antibodies, immunochemical technique.
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J.Serb.Chem.Soc. 66(5)331–334(2001)
UDC 546.668:669.794
Short communication

Synthesis and characterization of a novel (glycinato-N,O) yttrium(III) complex


Chemistry Department, Faculty of Science, University of Belgrade, Studentski trg 16, P.O. Box 158, YU-11001 Belgrade, Yugoslavia

(Received 20 November 2000, revised 7 February 2001)
A novel yttrium(III) complex with glycine has been synthesized starting from tris(ethanedioato-O,O)yttrium(III) by the substitution of the acetylacetonato chelate ligands with glycine. The reaction product was purified by ion-exchange chromatography and characterized on the basis of infrared spectroscopy. The structure of the productwas
tentatively established as tris(glycinato-N,O)yttrium(III) dihydrate.
Keywords: yttrium(III) complexes; glycinato-N,O chelates, IR spectroscopy.
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J.Serb.Chem.Soc. 66(5)335–343(2001)
UDC 661.862
Original scientific paper

Densification and crystallization behaviour of colloidal cordierite-type gels


Department of Inorganic Chemical Technology, Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, YU-11001 Belgrade and
*The Vinca Institute of Nuclear Sciences, P. O. Box 522, YU-11000 Belgrade, Yugoslavia

(Received 26 October 2000, revised 31 January 2001)
Three cordierite-type gels were prepared from an aqueous solution of Mg(NO3)2, a boehmite sol and silica sols of very small particle sizes. The effect of varying the silica particle size on the crystallization and densification behaviour was studied. Phase development was examined by thermal analysis and X-ray diffraction, while the densification behaviour was characterized by measuring the linear shrinkage of pellets. The activation energy of densification by viscous flow was determined using the Franckel model for non-isothermal conditions and a constant heating rate. The results show that spinel crystallizes from the colloidal gels prior to cristobalite, and their reaction gives a-cordierite, which is specific for three-phase gels. Decreasing the silica particles size lowers the cristobalite crystallization temperature and the a-cordierite formation temperature. The activation energy of densification by viscous flow is lower and the densification more efficient, the smaller the silica particles are.
Keywords: cordierite, sol-gel, densification, crystallization, activation energy of densification.
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J.Serb.Chem.Soc. 66(5)345–357(2001)
UDC 66.065:546.48:
Original scientific paper

Underpotential deposition of cadmium onto Cu(111) and Cu(110) from chloride containing solutions


Materials Engineering Department, Drexel University, Philadelphia, PA 19104, USA

(Received 26 December 2000)
Underpotential deposition (UPD) of Cd onto the (111) and (110) faces of copper in chloride containing electrolyte has been investigated by cyclic voltammetry and the potentiostatic pulse technique. It was shown that the UPD of Cd onto the (111) face of copper is characterized by two pairs of peaks, one pair corresponding to the formation of the (Ö19×Ö19)R23.4° structure of Cd and the other one, taking place close to the reversible potential of Cd deposition, corresponding to the alloying of Cu with Cd. Deposition of (Ö19×Ö19)R23.4° structure of Cd was found to take place by the mechanism of replacement of the adsorbed structure of chloride, without chloride desorption (the chloride stays adsorbed on top of the Cd layer). Similar behaviour was found for the (110) face of copper, with more pronounced alloying which provokes an irreversible change of the original (110) surface of copper.
Keywords: Cu(111), Cu(110), (Ö19×Ö19)R23.4° structure of Cd, alloying.
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