Browsing by Author "Rebiai, A."

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Chemical Composition And Antioxidant Activity Of Apis Mellifera Bee Pollen From Northwest Algeria
(University of Eloued جامعة الوادي, 2012-07-01) Rebiai, A.; Lanez, T.
The aim of this study was to assess the nutritional compositionand antioxidant activity of bee pollen produced in the North western region of Algeria.The content of total phenolic compounds,flavonoids, and antioxidant activity using the molybdate ion reductionmethod were determined. The meancontents of phenolic compounds and total flavonoids were 30.46 ± 8.22 mgof GAE.g–1 pollen and 8.92 ± 5.5 mg of RE.g–1 pollen, respectively. Highantioxidant activities were found for the molybdate ion reductionmethod, with values that ranged from 71.95 to 101.5μg of GAE.g–1 pollen. The bee pollen ofBoufarikshowed high antioxidant activity probably due to the high contentof phenolic compounds present in pollen.
Comparative Study Of Honey Collected From Different Flora Of Algeria
(University of Eloued جامعة الوادي, 2014-01-01) Rebiai, A.; Lanez, T.
The aim of the present study was to evaluate the physical and chemical properties of five Algerian unifloral types of honey. Several physical parameters of honey, such as pH, moisture content, electrical conductivity, total dissolved solids, color intensity and total sugar content, were measured. The mean pH, moisture content, EC and water insoluble solids of Algerian honey were 4.41± 0.58, 15.3 ± 1.5%, 0.324± 0.116 mS/cm and 0.141± 0.065%, respectively. The mean color was 81 ± 72 mm Pfund. The majority of honey samples test results (moisture content, electric conductivity and acidity) levels were within the acceptable range of world honey standards.
FATTY ACID COMPOSITION OF ALGERIAN PROPOLIS
(University of Eloued جامعة الوادي, 2017-09-01) Rebiai, A.; Belfar, M. L.; Mesbahi, M. A.; Nani, S.; Tliba, A.; Ghamem Amara, D.; Chouikh, A.
The fatty acid composition of eight honey bee (Apis mellifera) propolis load samples acquired in Algeria, were determined. The fatty acids presented a variable composition among these samples. All samples contained oleic, linoleic, stearic, eicosenoic, palmitoleic and palmitic acid. Only two samples did not contain arachidonic acid. Also results indicated palmitic, palmitoleic, linoleic, arachidonic and eicosenoic acid, respectively, accounted for 0.05% to 3.71%, 0.14% to 14.58%, 1.3% to 12.1%, 0.19% to 18.83%, and 0.23% to 12.86%; of the total lipids.The unsaturated fatty acid level varied from 19.72% to 51.85% of the total fatty acid composition, suggesting that propolis is a good source of unsaturated fatty acids to the diet. These data might help the regulatory agencies establish quality parameters for propolis produced in Algeria. There are no additional data available on Algerian propolis fatty acid composition.
Square Wave Voltammetric Determination Of Lead In Commercial Kohl Using A Glassy Carbon Electrode
(University of Eloued جامعة الوادي, 2011-07-01) Saha, M. A.; Alia, M.; Rebiai, A.; Lanez, T.
A simple sensitive square wave voltammetric method for the determination of lead contamination of several kohl samples purchased from Algeria retail stores was developed using glassy carbon electrode. The peak current response of 5 standards aqueous solution of lead in NaNO3 as supporting electrolyte was observed showing a linear calibration curve in the concentration range of 4×10-3 – 2.5×10-4 mol/l of lead. Over this concentration range, the equation obtained from the linear calibration graph for lead is Y = 0.00068 + 0.0093x with a correlation coefficient of r2 = 0.987. Following this step, the potential of an aqueous solution of 12 kohl samples containing 2 M nitric acid solution as supporting electrolyte is then swept in the same range of potential (-400 to -700 mV). The amount of lead is then deduced using the linear calibration graph for lead. The results showed up to 52.14% of lead present in kohl, this concentration was over the safe limits of lead set by the world health organization standards. However; only five commercial samples of ko
Study Of Antioxidant Capacity Of Different Parts Of Two South Algerian Eggplant Cultivars
(University of Eloued جامعة الوادي, 2012-07-01) Boubekri, C.; Rebiai, A.; Lanez, T.
In this study the antioxidant capacity of ethanolic EE and water WE extracts fromdifferent parts (calyx, peel, and pulp) of eggplant (Solanum melongena L) were evaluated using cyclic voltammetry.The antioxidant capacity of different parts of eggplant was measured using ascorbic acid equivalent antioxidant capacity assays. The peel extracts of both dark purple and white samples showed the highest antioxidant capacity (66.78and 75.62 mg/g) followed by pulp (16.54 and 30.56 mg/g), and calyx (14.82 and 21.27 mg/g). These results indicate that antioxidant capacity of eggplant varied by parts and solvents.