Chemistry Journal of Moldova

Ecological chemistry

INFLUENCE OF IODINATED OIL AND MARGARINE ON THE THYROID SYSTEM OF RATS

Author(s):

Rodica A. Sturza, Olga I. Deseatnicov, Cristina M. Popovici, Valentin S. Gudumac, Ion Nastas


Field: Ecological chemistry
Type: Research paper
Issue: 2008 Volume 3, no.1
Pages: 77-84
Keywords: Iodine deficiency, food fortification, sunflower oil, margarine, in vivo study.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2008.03(1).05

Graphical Abstract:
 Iodine deficiency is the most prevalent micronutrient deficiency in the world today. Food fortification is an important compliment to food-based approaches, and iodine fortification of foods as one of the strategies for the control of iodine deficiency. Manufacturing and consumption of sunflower oil fortified with iodine as well as derivative products on it basis is a perspective direction for elimination of alimentary dependent iodine deficiency disorders. The present work examines morphological changes in the thyroid system of rats at the experimental mercatholile-induced hypothyroidism. As well it determines the influence of iodinated oil and margarine on the thyroid system of rats. It specifies the safe value of iodinated oil and margarine for rats. In-vivo study demonstrated the efficacy of fortification of lipid products with iodine under iodine deficiency status.

Downloads: 13

THE ROLE OF ACTIVATED CARBON IN SOLVING ECOLOGICAL PROBLEMS

Author(s):

V. M. Mukhin, T. G. Lupascu


Field: Ecological chemistry
Type: Research paper
Issue: 2008 Volume 3, no.1
Pages: 62-66
Keywords: activated carbon, precious metals, environment.
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DOI:
dx.doi.org/10.19261/cjm.2008.03(1).09

Graphical Abstract:
 The authors present a brief analysis of the current global situation concerning the utilization of activated carbon in various fields. The article presents data concerning the synthesis and adsorption and structure properties of new activated carbons, used for solving ecological problems. The authors investigated the newly obtained activated carbons in comparison with several AC marks known in the world. It has been shown that currently synthesized AC are competitive with foreign marks.

Downloads: 26

THE INFLUENCE OF BINDING MATERIAL ON POROUS STRUCTURE OF SHAPED HOPCALITE

Author(s):

N.K. Kulikov, S.G. Kireev, A.O. Shevchenko, V.M. Mukhin, S.N. Tkachenko, T.G. Lupascu


Field: Ecological chemistry
Type: Research paper
Issue: 2008 Volume 3, no.1
Pages: 67-69
Keywords: bentonitic clay, hopcalite, adsorption, porosity, catalytic properties.
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DOI:
dx.doi.org/10.19261/cjm.2008.03(1).11

Graphical Abstract:
The authors have investigated the equilibrated adsorption of water vapors on GFG hopcalite, which was obtained using the extrusion shaping method, with bentonite clay as the binding compound. In the frames of the BET model, the values of the monolayer capacity and the size of medium area occupied by the water molecule in the filled monolayer have been determined. The distribution of pores according to their sizes has been evaluated. It has been established that the modification of the bentonitic clay allows directed construction of the hopcalite porous structure, i.e. the formation of the mesoporous structure with a narrow distribution of the pores capacities by sizes, which was achieved varying the sizes of binding compound particles.

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THE STUDY OF REDOX CONDITIONS IN THE DNIESTER RIVER

Author(s):

Viorica Gladchi, Nelli Goreaceva, Gheorghe Duca, Elena Bunduchi, Lidia Romanciuc, Igor Mardari, Ruslan Borodaev


Field: Ecological chemistry
Type: Research paper
Issue: 2008 Volume 3, no.1
Pages: 70-76
Keywords: kinetic indicators, hydrogen peroxide, redox state, free radicals, inhibition capacity
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DOI:
dx.doi.org/10.19261/cjm.2008.03(1).14

Graphical Abstract:
 The work presented in the paper discusses the contribution of the Novodnestrovsc water system to the formation of redox conditions in the lower Dniester. The conclusions were drawn on the basis of a long-term protocol of analyses that included the analysis of the oxygen regime, evaluation of the content of hydrogen peroxide, rH2, biological oxygen demand as well as other additional parameters.

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ESTIMATION OF THE NATURAL WATER SELF-PURIFICATION CAPACITY FROM THE KINETIC STANDPOINT

Author(s):

Gheorghe Duca, Elena Bunduchi, Viorica Gladchi, Lidia Romanciuc, Nelli Goreaceva


Field: Ecological chemistry
Type: Review
Issue: 2008 Volume 3, no.1
Pages: 10-21
Keywords: self-purification capacity, hydrogen peroxide, free radicals, kinetic indicators, redox state, inhibition capacity.
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DOI:
dx.doi.org/10.19261/cjm.2008.03(1).16

Graphical Abstract:
 The current paper contains a synthesis of the processes of chemical auto-purification that take place in natural waters; examples of mechanisms of such processes occurring with participation of dissolved organic matter, oxidants of the biogeochemical cycle of oxygen and of transition metals including copper and iron are presented. The kinetic indicators of natural water quality are presented as well.

Downloads: 32

INHIBITION OF IN VITRO NITROSATION OF NORNICOTINE

Author(s):

Diana Porubin


Field: Ecological chemistry
Type: Research paper
Issue: 2007 Volume 2, no.1
Pages: 78-82
Keywords: N-nitrosonornicotine, nitrosation, inhibition, grape seed extract, polyphenol.
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DOI:
dx.doi.org/10.19261/cjm.2007.02(1).11

Graphical Abstract:
 The inhibition of nornicotine nitrosation was studied. The concentration of nornicotine was 100 μM and nitrite 1000 μM. As inhibitors were used following compounds: ascorbic acid (as reference) (800, 1000, and 5000 μM), dihydroxyfumaric acid (1000 μM), (+)catechin (1000 μM), resveratrol (1000 μM), tartaric acid (1000 μM), quercetin (1000 μM), and grape seed extract (50, 100, 150 μg/ml). The best inhibitory effect was obtained for AAs at 5000 μM (90.7%), (+)Ct (95.5 %) and GSE at 150 μg/ml (96.1%). The small inhibitory effect was observed for TA – 22,5%.

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THE ROLE OF THE NATURAL ANTIOXIDANTS IN THE OXIHAEMOGLOBIN OXIDATION AND THE DIMINUTION OF NITRITE CONCENTRATION

Author(s):

Maria Gonţa


Field: Ecological chemistry
Type: Research paper
Issue: 2007 Volume 2, no.1
Pages: 67-77
Keywords: nitrite, haemoglobin, inhibitor of methemoglobinization.
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DOI:
dx.doi.org/10.19261/cjm.2007.02(1).12

Graphical Abstract:
 The paper includes the study of the inhibition of the process of methemoglobinization at oxidation with nitrites in the presence of sodium dihydroxyfumarate (DFH3Na) and resveratrol (3,4’,5-trihydroxystilben). The experimental study was carried out by treatment of the erythrocyte mass by hemolysis and exposure to nitrite. The kinetic investigations were carried out in following conditions: [Resv] = (5.10-5 – 1.10-3) mol/l, [DFH3Na] = 1.10-6 – 5.10-6 mol/l; [HbO2]=1.10-3 mol/l; pH 7,1; t = 370C. The rate of transformation of HbO2 in the presence of resveratrol and DFH3Na was calculated from kinetic curves of consumption of the substrate and formation of MetHb obtained pectrophotometrically (λmax= 540 nm for HbO2 and λmax=630 for MetHb). It has been found out that the introduction of resveratrol and DFH3Na in the system HbO2 – NO2- causes the decrease of the autooxidation factor φ DFH3Na approximately by 1.1 – 2.5 times and φresveratrol by 1.1 – 1.7 times. The time of achievement of the maximum rate of oxidation of HbO2 dζ/dτ (where ζ is the rate of transformation of HbO2 in MetHb) increases while the phase of fast oxidation of HbO2 decreases with increase of content of inhibitors. The process of interaction of nitrites with reducers (such as DFH4, DFH3Na, resveratrol and (+)-catechine) was carried out as well. It has been established that degree of diminishing of the concentration of nitrites in the system RedH2-NO2- decreases as follows: DFH4.

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COMPOSITION OF MINERAL PHASES OF THE GHIDIRIM DIATOMITE

Author(s):

Vasile Rusu, Aliona Vrînceanu and Igor Polevoi


Field: Ecological chemistry
Type: Research paper
Issue: 2007 Volume 2, no.1
Pages: 63-66
Keywords: diatomite, mineralogical composition.
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DOI:
dx.doi.org/10.19261/cjm.2007.02(1).13

Graphical Abstract: 
Studies of the mineralogical composition of diatomite from the Ghidirim location of RM, as well as of the extracted clay phase are presented. The mineral phase of the diatomite contains a number of clay minerals, like montmorillonite (in a mixture with insignificant quantities of slightly chloritized montmorillonite), illite and kaolinite. Diatomite contains also non-clay components as fine-dispersed quartz and amorphous material, the more probable sources of which are opal, amorphous alumosilicates, aluminum and iron hydroxides. The applied procedure for separation of clay fractions by sizing settling in liquid media proves to be very useful, enabling possibilities for more accurate identification of the clay constituents of diatomic material. Procedure allows to separate very clean clay fraction especially rich in montmorillonite, which can be utilized itself as mineral adsorbent for practical purposes.

Downloads: 29

USE OF CARBON CATALYSTS FOR OXIDATIVE DESTRUCTION OF WASTEWATERS

Author(s):

Svetlana S. Stavitskaya, Nikolai T. Kartel


Field: Ecological chemistry
Type: Research paper
Issue: 2007 Volume 2, no.1
Pages: 58-62
Keywords: carbon, catalysis, oxidation, destruction, wastewaters.
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DOI:
dx.doi.org/10.19261/cjm.2007.02(1).14

Graphical Abstract: 
The paper considers a possibility of using the catalytic action of the carbonaceous adsorbents modified by different ways for the purification of various solutions, natural and wastewaters. It has been found that the oxidative destruction of organic (phenols, dyes, pesticides, etc.) and inorganic (H2S) contaminants in water solutions is considerably intensified in the presence of both ordinary activated carbons and especially, carbons with specially introduced catalytic additives. It is shown that the sewage treatment level is strongly affected by the amount and nature of a modifying agent introduced on the carbon surface.

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STUDIES ON THE WATER SOLUBILIZATION PROCESSES OF OENOTANNINS AND THEIR PHYSICO-CHEMICAL PROPERTIES

Author(s):

Gh. Duca, T. Lupaşcu, P. Vlad, V. Kulciţki, R. Nastas


Field: Ecological chemistry
Type: Research paper
Issue: 2006 Volume 1, no.1
Pages: 60-64
Keywords: physico-chemical properties, water solubilization, oenotannins.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2006.01(1).01

Graphical Abstract:
 The results of investigation of oenotannins content in the seeds of different grape varieties are presented in the paper. It was demonstrated that the oenotannins content depends on the grape variety as well as on the geographycal zone of grape cultivation. A new procedure for
 water sollubilization of oenotannins by depolimerization has been elaborated. The mechanism of the oenotannins depolimerization has been reveiled by mass-spectrometric studies. It has been established, that the depolimerization process brings about formation of carboxilic acids and organic peroxides. The presence of the carboxilic and peroxidic groups was detremined on the basis of
 IR spectral analysis. It was demonstrated that the antioxidant properties of modified tannins are higher then those of initial unmodified ones.

Downloads: 297