Chemistry Journal of Moldova

2011 Volume 6, no.1

MERCURY ADSORPTION BY ARTHOBACTER GLOBIFORMIS AND SPIRULINA PLATENSIS

Author(s):

T. L. Kalabegishvili, I. Murusidze, D. T. Pataraya, E. Ginturi, M. V. Frontasyeva, E. I. Kirkesali, Gh. Duca, I. Zinicovscaia


Field: Ecological chemistry
Type: Review
Issue: 2011 Volume 6, no.1
Pages: 6-9
Keywords: Langmuir-Freundlich model, Arthrobacter globiformis, Spirulina platensis, biosorption, mercury, neutron activation analysis.
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DOI:
dx.doi.org/10.19261/cjm.2011.06(1).01

Graphical Abstract:
 The increasing contamination of soil, sediment, and water with heavy metals by natural and industrial processes is a worldwide problem. Many bacteria and microalgae have demonstrated ability to absorb toxic elements. To study mercury biosorption by bacteria Arthrobacter globiformis and microalga Spirulina platensis neutron activation analysis (NAA) was applied. The process of mercury biosorption by these media was described by Freundlich and Langmuir-Freundlich Model. Both microorganisms showed a great potential to be used as biosorbing agents for mercury removal from the environment.

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ON THE PECULIARITIES OF THE RING CONTRACTION REACTIONS OF HOMODRIMANES VIA ACID MEDIATED EPOXIDE REARRANGEMENT

Author(s):

Veaceslav Kulciţki, Tatiana Sîrbu, Nicon Ungur


Field: Natural product chemistry and synthesis
Type: Short communication
Issue: 2011 Volume 6, no.1
Pages: 110-112
Keywords: terpenoids, homodrimane, epoxide, rearrangement, hydrindane.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2011.06(1).02

Graphical Abstract: 
A selective rearrangement of a epoxy-homodrimanic substrate is described. Using fluorosulfonic acid at low temperature leads by ring contraction to a perhydrindanic structure. On the contrary, using boron trifluoride-diethyl ether at r.t. selectively brings about angular methyl migration.

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SYNTHESIS AND ANTIVIRAL ACTIVITY OF NEW THIAZOLE, 1,2,4-TRIAZOL AND OXINDOLE DERIVATIVES

Author(s):

Oleg Radul, Natalia Sucman, Serghei Pogrebnoi, Alic Barba, Athina Geronikaki, Fliur Macaev


Field: Organic chemistry
Type: Research paper
Issue: 2011 Volume 6, no.1
Pages: 101-109
Keywords: 2-aminothiazole, 1,2,4-triazol, oxindoles, cytotoxicity, antiviral activity.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2011.06(1).03

Graphical Abstract:

 


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SYNTHESIS AND CHARACTERIZATION OF [(5-MERCAPTO-1,3,4-OXADIAZOL-2-YL)ARYL]-3,5-DIARYL-4,5-DIHYDRO-1H-PYRAZOLE-1-CARBOTHIOAMIDES

Author(s):

Zinaida Ribkovskaia, Serghei Pogrebnoi, Alic Barba, Fliur Macaev


Field: Organic chemistry
Type: Research paper
Issue: 2011 Volume 6, no.1
Pages: 90-100
Keywords: carbothioamides, pyrazolines, isothiocyanatophenyl-2-thio-1,3,4-oxadiazoles.
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SYNTHESIS AND IR, NMR CARACTERISATION OF NEW P-(N,N-DIPHENYLAMINO) CHALCONES

Author(s):

Sîrbu Dumitru, Marin Ion


Field: Organic chemistry
Type: Research paper
Issue: 2011 Volume 6, no.1
Pages: 86-89
Keywords: chalcone, isothiocyanat, imidazole, NMR, IR.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2011.06(1).05

Graphical Abstract:
 This article reports on the high yield synthesis and novel chalcones with isothiocyanate and imidazol groups. The synthesis was started from N,N-diphenilamine and finished with 4-(N,N-diphenylamino)-4’-(2-thioxo-imidazolidin-4-one)-chalcone, where the cheap and accessible reagents were used.

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HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY FOR DETERMINATION OF AROMATIC ALDEHYDES IN WINE DISTILLATES

Author(s):

Elena Nezalzova


Field: Food chemistry
Type: Research paper
Issue: 2011 Volume 6, no.1
Pages: 81-85
Keywords: wine distillate, age of maturation, aromatic aldehydes, high-performance liquid chromatography.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2011.06(1).06

Graphical Abstract:
 Quality control of alcoholic beverages, coming into the market, is a defining element in preventing the production and supplying of defective products. One of the main criteria for quality control of wine distillates is to estimate their age, and more precisely the period of maturation as the dominant factor in determining the quality of cognacs and, consequently, their market price. On the opinion of majority scientists, one of the main factors, which determines the age of wine distillates, is the content of aromatic aldehydes, mostly vanillin, and their ratio.

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PRODUCTS DERIVED FROM CATALYTIC OXIDATION OF METHYLENE BLUE

Author(s):

T. Lupaşcu, M. Ciobanu, O. Bogdevici, V. Boţan


Field: Ecological chemistry
Type: Research paper
Issue: 2011 Volume 6, no.1
Pages: 77-80
Keywords: methylene blue, catalytic oxidation, chromatography, mass spectrometry.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2011.06(1).07

Graphical Abstract:
 It was established that the process of catalytic oxidation of methylene blue, at low concentrations (20 mg/L), i.e. in real solutions, gives sulfates and nitrates and new product, which can be categorized, in their vast majority, as impurities, probably got from the vacuum distillation unit, which make up for only ~ 10 % of methylene blue used in the experiment. Methylene blue adsorption at the interface occurs in real solutions. In case of performing the process at methylene blue concentration of 120 mg/L, hemi-micelles are adsorbed at the interface and the OH• radical acts more effectively due to the presence at the interface of a greater number of dye molecules.

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PHASE STABILITY OF MONOATOMIC ALCOHOL-GASOLINE MIXTURES FOR DIFFERENT COMPOSITIONS AND HYDRODYNAMIC CONDITIONS

Author(s):

Valerian Cerempei


Field: Analytical chemistry
Type: Research paper
Issue: 2011 Volume 6, no.1
Pages: 73-76
Keywords: butanol, ethanol, gasoline, mixtures, phase stability.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2011.06(1).08

Graphical Abstract:
 The article investigates phase stability for the mixtures of monoatomic alcohols (ethanol, butanol) with gasoline in the presence of water. There have been determined the optimal storage conditions of mixtures depending on their composition and mixing conditions. The positive influence of butanol on the phase stability of ethanol-gasoline mixtures was detected.

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VOLTAMMETRIC CHARACTERIZATION OF THE BEHAVIOR OF BIOLOGICALLY ACTIVE COMPOUND ENOXIL IN VARIOUS MEDIA

Author(s):

Gheorghe Nemţoi, Tudor Lupaşcu, Alexandra Ciomaga, Alexandru Cecal


Field: Analytical chemistry
Type: Research paper
Issue: 2011 Volume 6, no.1
Pages: 62-68
Keywords: complex biologically active compound Enoxil, cyclic voltammetry, standard redox potential, dosage of pharmaceuticals.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2011.06(1).09

Graphical Abstract:
 This paper presents the results of scientific research related to the electrochemical behavior of the complex preparation Enoxil. It was established that the oxidation-reduction process of Enoxil is quasireversible. The reactivity of Enoxil obtained from alcohol soluble enotannins is more pronounced, compared to that obtained from standard enotannins. The dependence of cathodic current intensity on Enoxil concentration is linear. This can be used to establish Enoxil concentration in solution. Cyclic voltamograms were used to establish reduction and oxidation potential and the formal redox potential on platinum electrode in sodium perchlorate aqueous environment. These features can be used for identification and determination of Enoxil in pharmaceuticals.

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TEMPERATURE INFLUENCE ON PHASE STABILITY OF ETHANOL-GASOLINE MIXTURES

Author(s):

Valerian Cerempei


Field: Analytical chemistry
Type: Research paper
Issue: 2011 Volume 6, no.1
Pages: 69-72
Keywords: composition, ethanol, gasoline, mixtures, phase stability, temperature.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2011.06(1).10

Graphical Abstract:
 The article investigates phase stability of ethanol-gasoline mixtures depending on their composition, water concentration in ethanol and ethanol-gasoline mixture and temperature. There have been determined the perfect functioning conditions of spark ignition engines fueled with ethanol-gasoline mixtures.

Downloads: 10