Chemistry Journal of Moldova

2012 Volume 7, no.2

Author(s):

S. Kovalskaya, N. Kozlov, A. Aricu, V. Kulcitki, N. Ungur


Field: Natural product chemistry and synthesis
Type: Short communication
Issue: 2012 Volume 7, no.2
Pages: 147-148
Keywords: diterpenoids, Ritter’s reaction, diamide, sclareol.
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DOI:
dx.doi.org/10.19261/cjm.2012.07(2).01

Graphical Abstract:
 The main products of sclareol (1) Ritter’s reaction in mild conditions are (8R,13R)-Labd-14(15)-en-8,13-diacetamide (2) (8R,13S)-Labd-14(15)-en-8,13-diacetamide (3) stereoisomeric on C13 atom and having unrearranged native diol skeleton. We present in the current communication the results of sclareol converting (1) into nitrogen-containing labdanes
in the Ritter’s reaction conditions.


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Author(s):

E. Pylypchuk, V. Mishchenko and T. Yu. Gromovoy


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2012 Volume 7, no.2
Pages: 143-146
Keywords: MALDI-ToF, X-ray phase analysis, albumin, immunoglobulin G, hydroxyapatite, interaction.
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DOI:
dx.doi.org/10.19261/cjm.2012.07(2).02

Graphical Abstract:
 It was shown by X-ray phase analysis, IR spectra analysis and MALDI-ToF mass spectrometry methods that interaction of synthetic hydroxyapatite with a solution of immunoglobulin G leads to its partial dissolution due to leaching from the surface of calcium triphosphate which, in our opinion, forms complexes with immunoglobulin G.


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Author(s):

Z. Ribcovskaia, F. Macaev


Field: Organic chemistry
Type: Research paper
Issue: 2012 Volume 7, no.2
Pages: 136-142
Keywords: mono-substituted 1,3,4-oxadiazoles, symmetrically 2,5-disubstituted 1,3,4-oxadiazoles.
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DOI:
dx.doi.org/10.19261/cjm.2012.07(2).03

Graphical Abstract:
 
This article is an extended abstract of a communication presented at the Conference Ecological Chemistry 2012


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Author(s):

F. Khamooshi and B. H. K. Jhaleh


Field: Organic chemistry
Type: Research paper
Issue: 2012 Volume 7, no.2
Pages: 130-135
Keywords: 5-Aryloxy tetrazoles, arylcyanates, guanyl azides, ZnCl 2 /AlCl 3 /silica (ZAS).
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DOI:
dx.doi.org/10.19261/cjm.2012.07(2).04

Graphical Abstract:
 A simple and efficient method for preparation of 5-aryloxy tetrazoles (3a-h) from arylcyanates (1a-h) with using ZnCl2/AlCl3/silica (ZAS) as an effective heterogeneous catalyst in solvent free are described with excellent yields and high purity. The rate of product formation was enhanced by introduction of electron donating substituents. The 1H NMR and chemical shifts and multiplicities are also discussed.


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Author(s):

I. Voda, V. Druta, C. Indricean, I. Ciumacov, C. Turta


Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2012 Volume 7, no.2
Pages: 124-129
Keywords: solvothermal synthesis; Cobalt(II), Nickel(II), Zinc(II) complexes; 4,5-diphenyl-2-nitroimidazole, physico- chemical properties.
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DOI:
dx.doi.org/10.19261/cjm.2012.07(2).05

Graphical Abstract:
 By interaction of cobalt(II), nickel(II), or zinc(II) nitrate with 4,5- diphenylimidazole in methanol in solvotermal conditions the new derivative of imidazole (4,5-diphenyl-2-nitroimidazole) and three new coordinative compounds [M(4,5-Ph2ImNO2)2(CH3OH)2] have been synthesized and investigated. Metal ions have a distorted octahedral environment with N2O4. Coordination number of metal is six. Ligand is coordinated to metal ion by one oxygen atom of nitrogroup and one nitrogen atom of imidazole.


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Author(s):

N. Marchitan


Field: Industrial chemistry
Type: Research paper
Issue: 2012 Volume 7, no.2
Pages: 116-123
Keywords: reactive sorption, tartaric acid, Freudlich equation, Langmuir equation, thermodynamic constants.
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DOI:
dx.doi.org/10.19261/cjm.2012.07(2).06

Graphical Abstract:
 This work describes an investigation of the process of reactive ion-exchange separation of tartaric acid from model systems with macroreticular resin AmberliteXAD2 impregnated with liquid ion-exchanger Amberlite LA-2 in batch equipment.The condition of Amberlite XAD2 impregnation process was investigated. Freudlichand Langmuir equations were verified and values of enthalpy, entropy and Gibbs energy were calculated. This article is an extended abstract of a communicationpresented at the Conference Ecological Chemistry 2012.


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Author(s):

E. Sandulachi, P. Tatarov


Field: Food chemistry
Type: Research paper
Issue: 2012 Volume 7, no.2
Pages: 103-115
Keywords: water activity, frozen strawerries, sugar addition, processing, osmotic treatment, stability.
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DOI:
dx.doi.org/10.19261/cjm.2012.07(2).07

Graphical Abstract:
 This paper presents the study information related to the processing of fruit by combined methods. Is presented on the concept of water activity and its role in product quality; mathematical modeling methods (GAB, BET et al.) in estimate the activity coefficients of non-electrolyte and electrolyte mixture. Have been carried experimental research to study the evolution of the biologically active substances in frozen strawberries with and without sugar addition. It proved that frozen strawberries with sugar, during storage are more stable regarding antioxidants content that strawberry frozen without sugar.


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Author(s):

Gh. Duca, R. Sturza, D. Lazakovich


Field: Food chemistry
Type: Research paper
Issue: 2012 Volume 7, no.2
Pages: 98-102
Keywords: phthalates, wine, gas-chromatography, mass-spectrometry, migration.
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DOI:
dx.doi.org/10.19261/cjm.2012.07(2).08

Graphical Abstract:
 A number of studies have shown phthalates’ potential impact on human health due to their carcinogenic and endocrinedisrupting effects. More than 2000 analyses for determination of phthalates’ rests in alcoholic beverages were done in the laboratory of National Center for Quality Testing of the Alcoholic Beverages (Republic of Moldova) using modern method of analysis like GC-MS. This article is an extended abstract of a communication presented at the Conference Ecological Chemistry 2012.


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Author(s):

S. Cibotaru


Field: Ecological chemistry
Type: Research paper
Issue: 2012 Volume 7, no.2
Pages: 93-97
Keywords: wood charcoal, physico-chemical activation, activated carbons, pore volume, specific surface area.
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DOI:
dx.doi.org/10.19261/cjm.2012.07(2).09

Graphical Abstract:
 This paper presents the results of scientific research aimed at studying processes of obtaining activated carbon from wood charcoal. We presented methods for determining the structure parameters and specific surface of carbonic adsorbents. Scientific research results allow concluding that wood charcoal is a cheap and effective material for the synthesis of activated charcoal.


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Author(s):

T. Mitina, N. Bondarenco, O. Bunciuc


Field: Ecological chemistry
Type: Research paper
Issue: 2012 Volume 7, no.2
Pages: 89-92
Keywords: drinking water, wells, chemical composition, maximum allowable concentration.
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DOI:
dx.doi.org/10.19261/cjm.2012.07(2).10

Graphical Abstract:
 The paper presents the results of groundwater study from different sources, selected in v. Myndreshty, Telenesti district, in various villages of Cahul district and in artesian wells in and around Chisinau. Large differences were evidenced in water chemistry in different villages of one district, as well as within the same village. Was assessed thee compliance of analyzed water to quality requirements of drinking water.


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