Volume 14, No. 3 (2013)

CONSIDERATIONS ON THE INFLUENCE OF COMPLEXATION IN THE COPPER UPTAKE AND TRANSLOCATION

Anca Dumbrava(*), Semaghiul Birghila, Daniela Stamate

The actual knowledge about food and the environment underlines the fact that agricultural and environmental sciences must solve various problems regarding copper uptake from soil to plants and its bioaccumulation, being important issues for copper concentration in crops and also for phytoremediation of polluted soils. We studied the relation between the form in which copper is applied to soil and the consequential copper bioavailability, uptake and translocation, using as examples simple and complex copper compounds. The copper concentration in basil plants harvested from soils treated with copper compounds and the calculated values of transfer coefficient, translocation factor, bioaccumulation factor, and uptake coefficient demonstrated that the ionic copper (from simple salts) is not necessarily easier to uptake than complex ions, but is easier translocated in plants, while the copper given as complex ions is most likely to be retained by roots. The results indicated that the involvement of copper complexes in agricultural treatments is a solution for soils phytoremediation, concerning the phytostabilization technology.

SYNTHESIS AND ANTIBACTERIAL STUDY OF NOVEL BENZIMIDAZOLIUM DERIVATIVES

Hamid Ennajih(1,2), Farida Ohmani(3), Rachid Bouhfid(1), El Mokhtar Essassi(1,2*)

Condensation of o-phenylenediamine with formic acid, acetic acid and glycolic acid gave a series of benzimidazole which on reaction with alkyl halide in phase transfer catalysis afforded the formation of the corresponding 1,3-dialkylbenzimidazolium salts. The structure has been established on the basis of spectroscopic and spectrometric analysis (1H and 13C NMR, IR, MS and single X-ray diffraction). The in vitro antibacterial activities of these salts have been investigated.

MICROENCAPSULATION OF CORIANDER OIL USING COMPLEX COACERVATION METHOD

Cristian Dima(1), Romică Creţu(2), Petru Alexe(1), Ştefan Dima(2*)

In the present study, the gelatin/gum Arabic/chitosan microcapsules encapsulating coriander oil were prepared by complex coacervation using glutaric aldehide and transglutaminase as hardening agents. The effects of wall materials, core/wall ratio, particle size, cross-linking agents, dispersing medium and temperature on the release of coacervate microcapsule were investigated. The antioxidative properties and antibacterial activity of free and microencapsulated coriander oil were examined. In the case of DPPH assay, the IC50 values of coriander oil free and coacervat microcapsule was comparables. Addition of chitosan in wall materials did not interfere with the antioxidant activity of coriander oil, but it improves the antibacterial activity of system. Coriander oil extraction by hydrodistillation revealed the influence of particle size on extraction yield. It increases with the decreasing of particle size resulting in maximum efficiency 0.836% for particles of 500 µm, 0.753% for those of 630 µm, and 0.704% for the size of 710 μm.

REMOVAL OF COPPER IONS USING ALIQUAT 336/TBP BASED SUPPORTED LIQUID MEMBRANE

Baghdad Medjahed, Mohamed A. Didi(*)

The sorption of copper (II) present in an aqueous media using a supported liquid membrane (SLM) by chloride tri-N-octylmethylammonium (Aliquat 336) and Tri-n-butylphosphate (TBP) from molar ratio 1:1, with polytetrafluoroethylene (PTFE) as a membrane support was studied. The effects of various parameters as initial pH, KSCN concentration and ammonium acetate concentration on the extraction yield were carried out. By a calculation program using CHEAQS V. L20.1, the determination of the percentages of the present species before and after extraction were given, in aqueous medium and on the membrane to be able to determine the relation between the nature of the extracted species and the extraction yield. The 23 factorial design achieve the best conditions of recovery procedure. The recovery of copper (II) is almost quantitative (94 %), in one step.

RECOVERY OF OVERRIPE BANANAS FOR BIOETHANOL PRODUCTION

Maria Cristiana Garnai(*), Camelia Vizireanu, Felicia Dima

This paper aimed the capitalization of overripe bananas that can no longer be used as fruits for consumption. Bananas fermentation was performed in several variants depending on the fermentation agent (yeasts) and on the different nutrients and growth promoters added to the fermentation media. The research aimed to establish an optimal bioconversion of the banana carbohydrates into ethanol.

(Cy2NH2)2SO4.2SnMe3SO4Cy2NH2; 2(Cy2NH2)2SO4.5SnMe3SO4Cy2NH2: SYNTHESIS AND INFRARED STUDY

Daouda Ndoye, Libasse Diop(*)

Allowing (Cy2NH2)2.SO4.2H2O or Cy2NH2.HSO4 to react with SnMe3Cl in ethanolic media in two specific ratios the sulphato complexes (mentioned in this paper title) were obtained and their infrared study was carried out. Discrete structures containing the complex-anion [SO4(SO4SnMe3)2]4- consisting of a central bidentate sulphate linked to SnMe3 groups which are then coordinated to monodentate sulphate anions or the complex-anion [(SO4)6(SnMe3)5]7- consisting of planar SnMe3 groups, monodentate or bidentate sulphate anions, these complex-anions dimerizing through cations via hydrogen bonds, are suggested.

SYNTHESIS AND INFRARED STUDY OF 3(Me4N)2MoO4.2SnBr4 AND (Me4N)2MoO4.SnBr4.H2O

Alexis Bienvenu Beleke, Libasse Diop(*)

On allowing (Me4N)2MoO4 to react with SnBr4 in specific ratios 3(Me4N)2MoO4.2SnBr4 and (Me4N)2MoO4.SnBr4.H2O adducts were obtained. Their infrared studies have been carried out allowing to suggest a discrete and an infinite chain structures.