JSCS Vol 69, No. 12
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J. Serb. Chem.
Soc. 69 (12) 991-998 (2004) |
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Synthesis, structural determination and antibacterial activity of compounds
derived from vanillin and 4-AMinoantipyrine
YOGESH KUMAR VAGHASIYA, RATHISH NAIR, MAYUR
SONI*, SHIPRA BALUJA* and
SUMITRA CHANDA
Department of
Biosciences and *Department of Chemistey, Saurashtra University, Rajkot 360005,
India
(Received 11 February
2004)
Schiff bases derived from 4-AMinoantipyrine and
vanillin were evaluated for their potential as antibacterial agents against
some GrAM positive and GrAM negative bacterial strains. The antibacterial
activity was studied against P. pseudoalcaligenes ATCC 17440, P.
vulgaris NCTC 8313, C. freundii ATCC 10787, E. aerogenes ATCC
13048, S. subfava NCIM 2178 and B. megaterium ATCC 9885. The
determination of the antibacterial activity was done using the Agar Ditsh
method. The Schiff bases produced were: (1)
4-(4-hydroxy-3-methoxybenzylideneAMino)-1,5-dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-one
[VV1]; (2) 4-(benzylideneAMino)-1,5-dimethyl-2-phenyl-1,2-dihydro- pyrazol-3-one
[VY2]); (3)
4-[(furan-3-ylmethylene)AMino]-1,5-dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-one
[VY3]; (4) 4-(4-methoxybenzylideneAMino)-1,5-dimethyl-2-phenyl-
1,2-dihydro-pyrazol-3-one [VY4]; (5)
2-methoxy-4-[(4-methoxyphenylimino)methyl]phenol [VY5]; (6)
4-[(2,4-dimethylphenylimino)methyl]-2-methoxyphenol [VY6]); (7)
2-methoxy-4-(naphthalene-1-yliminomethyl)phenol [VY7] and (8)
4-[(4-hydroxy-3-methoxybenzylidene)AMino]-N-(5-methylisoxazol-3-yl)benzenesulfonAMide
[VY8]. The antibacterial activity was evaluated in two polar solvents, DMSO and
DMF. The Schiff bases derived from vanillin as the central molecule with
2,4-dimethylaniline and sulphAMethoxazole as the side chain in DMSO effectively
inhibited the investigated bacteria and appear to be promising antimicrobial
agents.
Keywords: Schiff bases, antibacterial activity, DMSO, DMF.
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J. Serb. Chem.
Soc. 69 (12) 999-1004 (2004) |
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GAMma-radiation induced agglomeration of chicken muscle myosin and actin
ANA NICIFOROVIC, MARIJA B. RADOJCIC and
BRATOLJUB H. MILOSAVLJEVIC
Laboratory of Molecular
Biology and Endocrinology, Vinca Institute of Nuclear Sciences, P.O. Box
522-090, 11001 Belgrade, Serbia and Montenegro
(Received 24 November
2003 revised 24 December 2004)
Radiolytic behaviour of the major vertebrate
muscle proteins: fibrillar myosin (molar mass, Mm = 520,000
g/mol) and filAMent forming actin (Mm = 42,050 g/mol) was
studied using a SDS-polyacrylAMide gel electrophoresis and quantified by high
precision laser-densitometry. In order to study the OH radical contribution to
the radiation dAMage, purified chicken myosin and actin (4 mM) were prepared in N2O saturated solution and
irradiated with 1–3 kGy at 60Co gAMma source. With respect to
changes in the molecular mass, the only observed myosin and actin dAMage was
dose dependent agglomeration of proteins. The corresponding radiation chemical
yields of 5×10-8 mol J-1 and 6.3×10-8 mol J-1 were
obtained for myosin and actin, respectively. This result confirmed that only
the radiation-induced agglomeration is initiated with the reaction of the OH
radical even in the situation where the OH radical concentration produced
exceeds the protein concentration 500 times, thus enabling the multi-radical
attack to occur.
Keywords: radiation, gAMma rays, myosin, actin, protein agglomeration.
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J. Serb. Chem.
Soc. 69 (12) 1005-1011 (2004) |
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PRELIMINARY COMMUNICATION
Superoxide dismutase activity as a function of
culture aging of B-16 mouse melanoma cells
RATKO M. RADOJICIC, SNEZANA D. SPASIC*, ZORICA
S. SAICIC**, TAMARA B. JOVANOVC*** and JOVANA B. SIMIC-KRSTIC***
Institute of Physiology
and Biochemistry, Faculty of Biology, University of Belgrade, Studentski trg
16, 11000 Belgrade
*Center for Chemistry ICTM, P.O. Box 815, 11000 Belgrade,
**Institute for Biological Research “Sinisa Stankovic”, Department of
Physiology, Bul. Despota Stevana 142, Belgrade and
***Fullerene Science and Technology Centre, Chemical Power Sources Institute,
Batajnicki put 23, Belgrade-Zemun, Serbia and Montenegro
(Received 15 December
2003, revised 8 March 2004)
The C3 clone of B-16
mouse melanoma was cultured for 1, 6 and 9 days and analysed. The changes which
are not directly linked to melanogenesis in the B-16 / C3 cultures during their
maturation were characterized. Early (1 day), confluent (6 days) and old (9
days) cell cultures are distinguished by their leucine AMinopeptidase (LAP) and
a-naphthyl acetate esterase (ANAE) isoenzyme
patterns. Both quantitative and qualitative changes in LAP and ANAE isoenzyme
can be observed during culture maturation. There is an increase in the activity
of the enzyme copper, zinc-containing superoxide-dismutase (CuZn SOD). The increaase
in the CuZn SOD enzyme activity might be related to B-16/C3 cell melanogenesis
and / or to differentiation.
Keywords: B-16 mouse melanoma, isoenzymes, a-naphthyl acetate esterase (ANAE), leucine
AMinopeptidase (LAP), copper, zinc–containing superoxide dismutase (CuZn SOD).
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J. Serb. Chem.
Soc. 69 (12) 1013-1028 (2004) |
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Synthesis and characterization of biodegradable
aliphatic copolyesters with hydrophilic soft segments
DANIJELA JOVANOVIC, MARIJA S. NIKOLIC and JASNA
DJONLAGIC
Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4,
11000 Belgrade, Serbia and Montenegro
(Received 15 April 2004)
In this study, the synthesis, structure and
physical properties of two series of segmented poly(ester-ether)s based on
poly(butylene succinate) and two different types of polyethers were
investigated. The poly(ester-ether)s were synthesized by transesterification
reaction of dimethyl succinate, 1,4-butanediol and poly(ethylene oxide) (PEO, Mn
= 1000 g/mol) in the first series, and poly(tetrAMethylene oxide) (PTMO, Mn
= 1000 g/mol) in the second. The mass fraction of soft segments was varied
between 10 and 50 mass. %. The effect of the introduction of two different
polyether soft segments on the structure, thermal and rheological properties
were investigated. The composition of the poly(ester-ether)s, determined from
their 1H-NMR spectra, showed that incorporation of soft polyether
segments was successfully performed by the transesterification reaction in
bulk. The molecular weight was estimated from solution viscosity measurements
and complex dynAMic viscosities. The thermal properties investigated by DSC
indicated that the presence of soft segments lowers the melting and
crystallization temperature of the hard phase, as well as the degree of
crystallinity. DynAMical mechanical analysis was used to investigate the
influence of composition on the rheological behavior of the segmented
poly(ester-ether)s. The results obtained from an enzymatic degradation test
performed on some of the synthesized polymers showed that the biodegradability
is enhanced with increasing hydrophilicity.
Keywods: poly(ester-ether)s, poly(butylene succinate), poly(ethylene oxide),
poly(tetrAMethylene oxide).
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J. Serb. Chem.
Soc. 69 (12) 1029–1041 (2004) |
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Influence of the irradiation conditions on the
effect of radiation on polyethylene
ZORICA KACAREVIC-POPOVIC, DUSAN KOSTOSKI,
LJILJANA NOVAKOVIC, NADA MILJEVIC and BOJANA SECEROV
Vinca Institute of
Nuclear Sciences, P. O. Box 522, 11001 Belgrade, Serbia and Montenegro
(Received 6 May, revised
18 May 2004)
Two types of polyethylene, low density (LDPE)
and high density (HDPE), as well as low density polyethylene containing an
antioxidant were subjected to g-irradiation in the
presence of air and in water. The irradiated polymers were studied using IR
spectrophotometric analysis. The radiation induced oxidative degradation was
followed through the formation of oxygen containing groups by the development
of bands in the 1850–1650 cm-1 region and double bonds formation by
the development of bands in the 1050–850 cm-1 region. The
crosslinking efficiency was determined by measuring the gel content by
extraction with xylene. The radiation induced changes in the molecular
structure, evolution of oxygen containing species and formation, of vinyl
double bonds as well as of the crosslinking efficiency are discussed in terms
of the properties of the polymers in an electric field of low strength.
Keywords: HDPE, LDPE, g-irradiation,
carbonyl groups, vinylene groups, trans-vinylene groups, crosslinking.
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J. Serb. Che.
Soc. 69 (12) 1043–1051 (2004) |
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Styrene-divinylbenzene copolymer grafted with
phosphonic acid dialkylesters
GHEORGHE ILIA, EUGENIA FAGADAR-COSMA, ADRIANA
POPA and SMARANDA ILIESCU
Romania Academy,
Institute of Chemistry, 24 M. Viteazul Bv., 300223 Timisoara, Romania
(Received 5 Decembar,
revised 18 May 2004)
The functionalization of a crosslinked
chloromethylated polystyrene 8% divinylbenzene copolymer with phosphonic ester
groups is detailed. The reacton conditions were studied in order to determine
the optimal conditions for obtaining only diesters. A statistical method for
the calculation of the fraction of repetive units for the inited and final
resin is proposed.
Keywords: styrene–divinylbenzene, chloromethylated, phosphonic acid
dialkylester.
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J. Serb. Chem.
Soc. 69 (12) 1053-1061 (2004) |
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Nickel(II) cyclohexylethyldithiocarbAMate complexes with monodentate P-donor
ligands in the coordination sphere
JOSEF HUSÁREK, RICHARD PASTOREK, MICHAL MALOŇ, ZDENĔK ŠINDALÁŘ and MAREK
PAVLÍČEK
Department of Inorganic
Chemistry, Palacký University, Križkovského 10, 771 47 Olomouc, Czech Republic
(Received 12 January,
revised 12 May 2004)
A series of new Ni(II) dithiocarbAMate compounds
of the composition [NiX(cetdtc)(PR3)] (X = Cl, Br, I, NCS; cetdtc =
cyclohexylethyldithiocarbAMate; R = phenyl, n-butyl) has been
synthesized. All the isolated complexes have been characterized by elemental
analysis, IR and UV/VIS spectroscopy, 31P{1H}-NMR
spectroscopy, thermal analysis, magnetochemical and conductivity measurements.
On the basis of the results of the physico-chemical study, all complexes are
diAMagnetic, non-electrolytes, with a square-planar NiS2PX
chromophore.
Keywords: nickel(II) cyclohexylethyldithiocarbAMate complexes, monodantate
P-donor ligands, synthesis, 31P{1H}-NMR spectroscopy.
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J. Serb. Chem.
Soc. 69 (12) 1063–1072 (2004) |
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Determination of intrinsic equilibrium constants at an alumina/electrolyte interface
ZAKLINA N. TODOROVIC and SLOBODAN K. MILONJIC
Chemical DynAMics Laboratory, The Vin~a
Institute of Nuclear Sciences, P. O. Box 522, 11001 Belgrade, Serbia &AMp;
Montenegro
(Received 5 March 2004)
Intrinsic ionization and complexation constants
at an alumina/electrolyte interface were studied by the site binding model,
while the sorption of alkali cations from aqueous solutions was interpreted by
the triple-layer model. The surface properties of alumina were investigated by
the potentiometric acid-base titration method. The point of zero charge (pHpzc)
of alumina obtained by this method was found to be 7.2. The obtained mean
values of the intrinsic protonation and ionization constants of the surface
hydroxyl groups and the intrinsic surface complexation constant, in different
electrolytes, are pKinta1 = 4.4, pKinta2 = 9.6 and
pKintM+ = 9.5, respectively.
Keywords: alumina, surface properties, point of zero charge, intrinsic
ionization and complexation contants.
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J. Serb. Chem.
Soc. 69 (12) 1073-1097 (2004) |
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Influence of temperature on the volumetric properties of ethanol + water +
1–pentanol
J. M. RESA, C. GONZALEZ, J. M. GOENAGA and M.
IGLESIAS*
DepartAMento de
Ingeniería Química, Universidad del Pais Vasco, Apto. 450, Vitoria and
*DepartAMent d’Enginyeria Quimica, Escola Tacnica Superior d’Enginyeria
Química, Universitat Rovira i Virgili,
Avinguda Països Catalans 26, CAMpus Sescelades, 43007 Tarragona, Spain
(Received 1 March,
revised 2 July 2004)
Knowledge of physical properties and phase
equilibria is necessary for the design and optimization of the equipment for
the production of distilled alcoholic beverages. In this paper the temperature
dependence of the excess molar volumes of the ternary system ethanol + water +
1-pentanol in the temperature range 228.15 – 323.15 K and atmospheric pressure,
are presented, due to the importance of 1-pentanol AMong the flavour compounds
contained in this type of beverages. The excess molar volumes are negative over
the whole homogeneous composition range, but tend to positive values towards
the binaries ethanol + 1-pentanol and water + 1-pentanol. Because the design of
current processes is strongly computer oriented, consideration was also given
to how accurate the predictions of the SRK equations of state are. Different
derived properties were computed due to their importance in the study of
specific molecular interactions.
Keywords: excess molar volume, temperature, ethanol, water, 1-pentanol,
prediction.
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J. Serb. Chem.
Soc. 69 (12) 1099–1110 (2004) |
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Electrochemistry of active chromium. Part IV. Dissolution of chromium in
deaerated sulfuric acid
D. M. DRAZIC, J. P. POPIC, B. JEGDIC* and D.
VASILJEVIC-RADOVIC**
ICTM-Center for Electrochemistry, Njegoseva 12, P. O. Box 473, 11001
Belgrade
*Technical Military Institute, Kataniceva 14, 11000 Belgrade and
**ICTM-Center for Microelectronic Technologies and Single Crystals, Njegoseva
12, P. O. Box 473, 11001 Belgrade, Serbia and Montenegro
(Received 28 May 2004)
Chromium dissolution in aqueous sulfuric acid
solutions in the pH range 0.5 –3 was studied electrochemically by the
potentiostatic or very slow potentiodynAMic method, and by the analyses of the
Cr ion concentrations in the electrolyte formed during the experiments. It was
shown that the electrochemical anodic dissolution follows a common Tafel line
with a slope of ca. 120 mV dec-1, independent of the solution
pH and the hydrodynAMics, while the passivation potentials and passivation
currents were independent on hydrodynAMics but strongly dependent on the pH. In
parallel with the electrochemical dissolution, a considerable “anomalous” or
chemical Cr dissolution process occurs, as evidenced by the spectrophotometric
analyses of the electrolytes for Cr ions after prolonged potentiostating of the
electrodes at different potentials, as well as by measuring the electrode
weight losses. All these results indicate the existence of a potential
independent reaction of Cr dissolution occurring in parallel to the anodic
dissolution process. Mechanisms for both the electrochemical and the chemical
process are proposed. The consequences of these phenomena on the behavior of
some practical systems where chromium or a chromium alloy (e.g.,
stainless steels) are used are discussed.
Keywords: chromium, acid solutions, anodic dissolution, anomalous
dissolution, chemical dissolution, reaction mechanisms.
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J. Serb. Chem.
Soc. 69 (12) 1111-1120 (2004) |
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Investigation of the mechanism of mercury removal from a silver dental AMalgAM
alloy
Z. ODANOVIC and M. DJURDJEVIC*
Faculty of Technology
and Metallurgy, University of Belgrade, Karnegijeva 4, 11000, Belgrade, Serbia
and Montenegroand 2University of Windsor, Department for Mechanical and
Materials Engineering, Room 209, Essex Hall,
401 Sunset Avenue, Windsor, Ontario, Canada, N9B 3P4
(Received 13 February
2004)
An investigation of silver dental AMalgAM
decomposition and the mercury removal mechanism was performed. The
decomposition process was analysed during thermal treatment in the temperature
interval from 400 °C to 850 °C and for times from 0.5 to 7.5 h. The chemical
compositions of the silver dental AMalgAM alloy and the treated alloy were
tested and microstructure analysis using optical and scanning electron microscopy
was carried out. The phases were identified using energy disperse electron
probe microanalysis. A mechanism for the mercury removal process from silver
dental AMalgAM alloy is suggested.
Keywords: silver AMalgAMs, mercury removal, thermal treatment.
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J. Serb. Chem.
Soc. 69 (12) 1121–1128 (2004) |
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Pb1–xMnxTe
single crystals and their structural properties
ALEKSANDAR GOLUBOVIC, SLOBODANKA NIKOLIC, STEVAN
DJURIC*, and NEBOJSA ROMCEVIC
Institute of Physics,
Pregrevica 118, P. O. Box 68, 11080 Zemun,
*Faculty of Mining and Geology, Djusina 7, P. O. Box 162, 11000 Belgrade,
Serbia and Montenegro
(Received 17 November
2003, revised 23 April 2004)
Pb1-xMnxTe crystals were
grown by the vertical Bridgman method. Their structural properties were
observed both by optical microscopy after chemical polishing and ething, and by
X-ray powder diffraction analysis. A solution of 5 vol. % Br2 in HBr
at room temperatur, for an exposure of 2 min was determined for chemical
polishing. A solution of 20 g KOH in 1 ml H2O2, 2 ml
glycerol (C3H8O3), and 20 ml H2O at
room temperature for an exposure for 6 min was found to be a suitable etching
solution. The obtained results are discussed and compared with published data.
Keywords: lead manganese telluride, Bridgman method, structural properties,
etching, chemical polishing.
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J. Serb. Chem.
Soc. 69 (12) 1129-1144 (2004) |
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Modeling of adsorber/desorber/catalytic
reactor system for ethylene oxide removal
ZORANA LJ. ARSENIJEVIC, ZELJKO B. GRBAVCIC* and
BOSKO V. GRBIC
Institute for Chemistry,
Technology and Metallurgy, University of Belgrade, Njegoseva 12, 11000 Belgrade
and
*Faculy of Technology and Metallurgy, University of Belgrade, Karnegijeva 4,
11000 Belgrade, Serbia and Montenegro
(Received 16 March 2004)
The removal of ethylene
oxide (EtO) in a combined system adsorber/desorber/catalytic reactor has been
investigated. The combined system was a modified draft tube spouted bed reactor
loaded with Pt/Al2O3 catalyst. The annular region was
divided into two sectons, the “hot” section contained about 7 % of catalyst and
it behaved as a desorber and catalytic incinerator, while the “cold” section,
with the rest of the catalyst, behaved as a sorber. The catalyst particles were
circulated between the two sections by use of a draft tube riser. The
Computational Fluid DynAMics (CFD) progrAM package FLUENT was used for
simulations of the operation of the combined system. In addition, a
one-dimensional numerical model for the operation of the packed bed reactor was
compared with the corresponding FLUENT calculations. The results of the FLUENT
simulations are in very good agreement with the experimental observations, as
well as with the results of the one-dimensional numerical simulations.
Keywords: draft tube spouted bed, Pt/Al2O3 catalyst,
ethylene oxide removal, adsorber/desorber/catalytic reactor, numerical
modeling, CFD modeling.
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J. Serb. Chem.
Soc. 69 (12) 1145–1151 (2004) |
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The correlation of the
values of plant-avalilable Pb and Cd in soil determined using different types
of extragens
ANKICA SAVIN, DRAGAN VESELINOVIC* and DRAGAN
MARKOVIC
Bio-Ecological Centre,
P. Drapsina 15, 23000 Zrenjanin,
*Faculty of Physical Chemistry, Studentski trg, 12–16, P. O. Box 137, 11000
Belgrade, Serbia and Montenegro
(Received 19 February,
revised 8 June 2004)
The plant-available AMount of Pb and Cd in soil
was determined by extraction using the solutions: 1) 0.5 M Na2EDTA, pH 5.2; 2)
1 M KCl, pH 7.0; 3) 0.1 M KCl, 0.05 M Na2EDTA, pH 6.2; 4) 2 % CH3COOH,
pH 2.5 and 5) 1 M CH3COONH4, pH 4.8. Chernozem and
hydromorphic black soil types from the Middle Banat were used. It can be
concluded that the values of the plant-available AMounts of Pb and Cd in a soil
depends on the stability constants of their complexes with ligands in the
extraction solution. The conversion factors for the recalculation of the
AMounts of Pb and Cd obtained using the citted extractants have been
calculated.
Keywords: lead, cadmium, soil, metal extraction.
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J. Serb. Chem.
Soc. 69 (12) 1153–1155 (2004) |
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NOTE
Depleted uranium in the air during the cleanup
operations at Cape Arza
MIRJANA RADENKOVIC, TOMISLAV ANDJELIC*, MILOJKO KOVACEVIC, and PERKO VUKOTIC**
Vinca Institute of
Nuclear Sciences , P. O. Box 522, 11001 Belgrade,
*Center for Eco-toxicological Research of Montenegro, Put R. Ivanovica 2, 81001
Podgorica and
**Faculty of Mathematics and Science, University of Podgorica, P. O. Box 211,
81001 Podgorica, Serbia and Montenegro
(Received 22 April 2004)
Cape Arza was contAMinated with depleted uranium
(DU) in the air strikes of NATO aeroplanes on May 30, 1999. The cleanup and
decontAMination of the site started in 2001. Here the results of air monitoring
performed during the cleanup operations in Spring 2002. are presented. The
collected air sAMples were analyzed by high-resolution alpha spectrometry. The
obtained concentrations of airborne uranium are about ten times higher than the
average value usually reported for air. The ratio of the 234U/238U
activities indicates the presence of depleted uranium in the air during the
cleanup action, due to resuspension and soil disturbance in the contAMinated
teritory.
Keywords: air, depleted uranium, alpha-spectrometry.
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CONTENTS OF VOLUME 69
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Subject index
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Author index
End of Vol. 68
Copyright &AMp; copy; SHD 2005.
January31, 2005.
For
more information contact: JSCS@tmf.bg.ac.yu