Volume 10, No. 4 (2009)

SYNTHESIS AND SPECTROSCOPIC STUDIES OF (Cy₂NH₂)₂C₂O₄•2SnMe₂Cl₂, (Me₄N)₂C₂O₄•2SnMe₂Cl₂ AND (Cy2NH2)2C2O4•2SnMe2(C2O4)2(Cy2NH2)2

ALIOUNE FALL(1), K.Y. ARIMAN OKIO(1), LIBASSE DIOP(1)*, B. MAHIEU(2)

Three new oxalato organotin IV adducts and complex have been synthesized, their infrared and Mössbauer studies carried out. In the three compounds the coordination number of tin IV is 6, the SnMe2 residue being linear, the oxalate anion behaving as a bichelating or a monocoordinating ligand. The structures, suggested from spectroscopic data, are all discrete. The key role of the non symmetrical cation Cy2NH2+ involved in NH----O and NH----Cl hydrogen bonds is noteworthy.

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SYNTHESIS AND INFRARED STUDY OF SOME NEW MOLYBDATO AND HYDROGENOMOLYBDATO ADDUCTS, DERIVATIVES AND COMPLEXES OF CADMIUM AND ANTIMONY (V)

SERIGNE FALLOU POUYE, IBRAHIMA CISSÉ*, LIBASSE DIOP

Five new molybdato adducts, derivative and complexes of Cd and Sb have been synthesized and studied by infrared. The structures are discrete, the anion behaving as a trichelating and polydentate ligand. The key role of Cy2NH2+ in the supramolecular architecture is noteworthy.

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NEW PHENOXYALKYL CARBOXYLIC ACIDS DERIVATIVES SYNTHESIS AND CHARACTERIZATION

ANCA MIHAELA MOCANU

In the present paper the studies on the sulphon-amidated aryloxy-alkylcarboxylic acids are extended by their attaching on certain substrata able to confer some especial biological properties to the final products, such as anti-tumor and antioxidant actions useful in treating inflammatory processes, ulcer, convulsions and diabetes, as well as herbicidal action. The stepwise syntheses of the sulphonamidated aryloxyalkylcarboxylic acid derivatives and their characterization by elemental analysis data and IR and 1H-NMR spectral measurements are described. The newly obtained compounds could show potential pharmaceutical and herbicide properties.

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EFFECT OF THE HYDRIC STRESS ON THE SYNTHESIS OF MITOCHONDRIAL AND CHLOROPLAST PROTEINS FOR TWO VARIETIES OF DURUM WHEAT. <br/> EFFET DU STRESS HYDRIQUE SUR LA SYNTHESE DES PROTEINES MITOCHONDRIALES ET CHLOROPLASTIQUES DE DEUX VARIETES DE BLE DUR

W. ZERRAD(1), B.S. MAATAOUI(2), T. FECHTALI(1), S. HILALI(2), S. EL ANTRI(1), S. LAZAR(1)*, A HMYENE(1)

The effect of water stress on the synthesis of mitochondrial and chloroplast proteins of two varieties of durum wheat Karim and Tomouh were evaluated. The conditions of water stress resulted in both varieties studied a reduction of water potential with an increase in the accumulation of total protein in both chloroplasts and in mitochondria.

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IN VITRO ANTIOXIDANT ACTIVITY AND TOTAL PHENOLIC CONTENTS IN METHANOL CRUDE EXTRACTS FROM THE ALGERIAN MEDICINAL PLANT LIMONIASTRUM FEEI

IMAD ABDELHAMID EL-HACI, AMEL DIDI*, FAWZIA ATIK BEKKARA, MOHAMMED GHERIB

The use of synthesis antioxidant molecules is being dangerous anyway, because of the potential toxicological risks. In fact, new source of natural antioxidant molecules are required. The phenolics, natural compounds largely present in the vegetable kingdom, are recognized for their antioxidant activity and still little exploited by different industry. Our work aim is to evaluate the antioxidant capacity of the phenolic compounds extracted from the Algerian medicinal plant: Limoniastrum feei. This plant presented high levels of polyphenols ranged from 232.69 to 254.90 mg gallic acid equivalents/g dried extract, and flavonoids ranged from 106.33 to 129.66 mg catechin equivalents/g dried extract. The antioxidant activity of the methanolic crude extracts were evaluated using different antioxidant assays, including: reducing power and DPPH free radical scavenging activity. The results showed that the methanolic extract of Limoniastrum feei presented an average reducing power and more potent inhibition of DPPH radical activity. The study of organic fractions of this plant may reveal interesting results.

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EVALUATION OF THE INSECTICIDAL, LARVICIDAL AND OVICIDAL EFFECTS ON CALLOSOBRUCHUS MACULATUS OF ESSENTIAL OILS OF CYMBOPOGON GIGANTEUS AND OF XYLOPIA AETHIOPICA

JEAN-PIERRE NOUDOGBESSI(1), MARTIN KEKE(1), FÉLICIEN AVLESSI(1), DANSOU KOSSOU(2), DOMINIQUE C. K. SOHOUNHLOUE(1)*

The chemical composition of essential oils extracted from leaves of Cymbopogon giganteus (Hochst.) Chiov and fruits of Xylopia aethiopica (Dunal) A. Richard has been studied by gas chromatography (GC) and gas chromatography coupled with mass spectrometry (GC/MS). The doses of each of these essential oils tested on Callosobruchus maculatus at temperatures between 22 °C and 31 °C and a relative humidity of 80% are 0, 10, 20, 30 and 40µL.mL-1. The tests of conservation carried out of cowpea seeds (Vigna unguiculata (L.) Walp.) of local variety "Chawe" showed that these essential oils have variously exhibited larvicidal and ovicidal effects on larvae and eggs of C. maculatus (Fabricius) adult to the highest dose tested (40 µL.mL-1).The damage generated by C. maculatus and its larvae were evaluated by the percentages of attack (A) and the loss in weight of seeds of cowpea (B).

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THE CENTRAL ROLE OF THE FENUGREEK (TRIGONELLA FOENUM-GRAECUM L.) IN THE REGULATION OF THE GLYCEMIA IN NORMAL RATS: A STEREOTAXIC STUDY

A. SOUMARI(1), M. SLIMANI(1), S. EL ANTRI(2), S. LAZAR(2), A. HMYENE(2), F. BERRADA(3), T. FECHTALI(1)*

The fenugreek or “Trigonella foenum-graecum” was used for a long time like remedy for the diabetes and the problems of appetite. By its amino-acid the 4-hydroxy-isoleucine, this plant made evidence in several phytopharmacologic studies and in particular by stimulating the production of insulin and by improving the sensitivity of the organization to this hormone. The aim of the present work is to undertake for the first time to our knowledge a study on the central effect of this plant on the brain for regulating the glycaemia. In order to make this study, we carried out the intracerebroventricular injection of two extracts of the fenugreek; one is an aqueous extract while the other is extracted with methanol. Measurements of the rate of glucose in blood were made regularly from the injection and each 10 minutes till the third hour. The results obtained showed a decrease of 30% of the glycaemia two hours following the administration of the aqueous extract of the plant, this value returned to its initial value one hour later. Concerning the organic extract, a more important decrease was noted at the end of the second hour but remained stable until the third hour.

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PRELIMINARY STUDIES REGARDING THE BEHAVIOUR OF SELECTED STREPTOMYCES STRAINS AS XYLANASES PRODUCERS PRESERVED BY LYOPHILIZATION

GIGI COMAN*, MARIANA RADVAN

Lyophilization is an effective method for conservation of most bacteria and fungi started cultures. Through the combination of low pressures and low temperatures, the water has been removed until residual moisture of 1 - 3%. The aim of this study was to evaluate the behavior and stability of lyophilizated selected Streptomices sp. strains, selected by for xylanases producing, included in the collection of micro-organisms Bioaliment Research Platform (acronym MIUG). Behavior of freeze-dried cultures after reactivation varies depending on the nature and concentration of protective agents during lyophilization.

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MODELING OF THE THERMO-PHYSICAL PROPERTIES OF GRAPES JUICE II. BOILING POINT AND DENSITY

ANDREI I. SIMION*, CRISTINA GRIGORAS, LACRAMIOARA RUSU, LUCIAN GAVRILA

When optimizing the process of grape juice manufacture not just to obtain an excellent quality, but also to develop a data base is essential to know the evolution of physical properties, such as density or boiling point elevation. These properties are affected by pressure, temperature and solid content. The aim of this work was to establish a mathematical relation between these variables. In order to assess and select a suitable mathematical model the known data were fitted in different equations. Tests results have shown that at constant dry matter content the pressure and the boiling point are related by a “shifted power” equation while between temperature and density variation a logarithmic model seems to be the most appropriate.

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MATHEMATICAL MODELING OF VITAMIN C LOSSES IN LEMONS DURING THERMAL TREATMENTS

ANDREI I. SIMION*, OANA-IRINA PATRICIU, LACRAMIOARA RUSU, LUCIAN GAVRILA

Predicting the evolution of vitamin C concentration in different thermal treatments could be beneficial in offering an estimative nutritive value for food products which are in the conceptual stage. Known for its chemical instability, vitamin C can be deactivated by a wide range of oxidizing agents, but in food industry the most common cause of vitamin C reduction is the use of various thermal processes alongside raw materials conversion into the final products. Mathematical analysis for a comparative study about the variations of vitamin C concentrations in lemons, variations produced by the uses of low, medium and respectively high temperature treatments is presented in this paper.

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