Publications Scientifiques

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Author: search.filters.author.Benamara, S.

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    Adsorption kinetics modelling of methylene blue solution by activated carbon using Peleg’s equation
    (Université M'hamed Bougara de Boumerdès, 2020) Bourfis, Nassima; Benaissa, F.; Benamara, S.; Gougam, H.; Louhab, K.
    The aim of this study is to envisage the possibility of modelling the adsorption kinetics of methylene blue (MB) by activated carbon using the Peleg’s model. Equation often used to describe the sorption and absorption kinetics of water by the material. The study of equilibrium adsorption was also envisaged in this study and the isotherms of Langmuir and Freundlich were tested. The activated carbon was prepared from almond shells bitter, fruit of plants growing in parts of Algeria, especially in the Setif region. Statistical analyses, have proved that the adsorption kinetics of MB by activated carbon is perfectly (R² = 0.9999) described by the Peleg model. On another hand, the study showed that, compared to the Langmuir model, Freundlich model is most appropriate to describe the equilibrium adsorption
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    Enhancement of the antioxidant activity of a by-product (Phoenix dactyliferaL.) from the Agri-food industry
    (University M'hamed Bougara - Boumerdes, 2020) Lecheb, F.; Benamara, S.; Gougam, H.
    Despite their biological value, date seeds as by-product are not quite studied, compared to analogue agricultural wastes. In addition to the basic physiochemical characterization, the antioxidant power (AP) of by-product (Phoenix dactyliferaL.) seeds (DS) is presently investigated. The AP was evaluated through the reducing power (RP), as well as antiradicalar activity (AA) of extracts obtained with different solvents (water, methanol, ethanol, acetone, chloroform, and hexane). Except hexane and chloroform, all other employed solvents give extracts with RP above 0.3 optic density units. Concerning the AA, all extracts obtained with cold extraction display a highest antioxidant activity for a dried extract concentration of 0.6 -0.7 mg ml-1. In addition, the most important AA (> 90%) is found for BHT, vitamin E, ethanolic and methanolic extracts, whereas the least values (70-80%) report to the acetone and chloroform extracts. The similar results are also found when the hot extraction is applied. On the other hand, the most interesting correlations (R2>0.94) are reached for combinations of type polyphenols/RP (case of extraction with pure ethanol and 50% -acetone), and flavonoids/RP (in the unique case of the extraction with 50%-acetone). Given their antioxidant potential, DS extracts can be recommended as an ingredient in various food and non-food formulations.
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    Some physicochemical and morphological characterizations of three varieties of Algerian common dates
    (European Journal of Scientific Research, 2007) Chibane, H.; Benamara, S.; Noui, Y.; Djouab, A.
    The date palm is a typical plant of the arid and semi arid areas. Unfortunately in fact they are not all the varieties that profits from an economic interest except for Deglet-Nour. Thus, it represents a danger to the genetic inheritance and the biodiversity. The three varieties studied in this work are: Mech-Degla, Degla-Beida and Frezza, which are common varieties cultivated in the south of Algeria. They are characterized by a good availability and an interesting aptitude for the conservation. In this work (included in our project consisting in the valorization of the common local dates) were presented only the obtained first results. The morphological characteristics (weight of whole date, pea of pulp (pulpit), weight of the seed, length and width of whole date and the seed, pulp/seed ratio, pulp/date ratio, seed/date ration) are given. The physicochemical parameters studied are: pH, ashes, flavonoid, minerals and antioxidant activity. All three varieties are particularly rich in minerals (K, Ca, Na, Zn, Fe, Cu and Mn), in flavonoïd. Concerning the antioxidant activity, different cultivars is endowed with an extraordinary capacity (61.82, 61.56 and 61.61% respectively for Mech-Degla, Degla-Beida and Frezza). © EuroJournals Publishing, Inc. 2007
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    Activités antioxydantes de quelques fruits communs et sauvages d’Algérie
    (Springer, 2010) Allane, T.; Benamara, S.
    Les activités antioxydantes (AA) de 27 fruits provenant principalement du nord algérien sont analysées par mesure du pouvoir réducteur du fer (III) à fer (II). De tous les fruits étudiés, la fraction (pulpe  +   pelure) des baies de l’arbre à fraises (Arbutus  unedo L.), les mûres sauvages (Morus  nigra L.) et les dattes (Phoenix  dactylifera L.) noires arrondies montrent des AA plus élevées  : 2  049, 1  115 et 1  091  mg de vitamine C par 100  g de masse fraîche (mf) respectivement. L’effet synergique (ES), calculé uniquement pour les pelures de trois fruits est de 1,29  ± 0,04 (arbousier/datte grenat à noyaux), 1,74  ± 0,07 (arbousier/raisins noirs), 2,24  ± 0,11 (dattes grenat à noyau/raisins noirs) et 1,45  ± 0,05 (arbousier/datte grenat à noyau/raisins noirs). L’indice d’hétérogénéité (IH) introduit dans cette étude renseigne sur la répartition des substances antioxydantes entre les différentes parties des fruits étudiés
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    Caractérisation d’une préparation semi-solide traditionnelle antibrûlure = Characterization of anti-scald traditional semisolid preparation
    (Springer, 2014) Hamadi, F.; Boudif, K.; Gougam, H.; Djouab, A.; Allane, T.; Benmounah, A.; Benamara, S.
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    Some technologic proprieties of common date (Phoenix dactylifera L.) fruits
    (2008) Benamara, S.; Gougam, H.; Amellal, Hayet; Djouab, A.; Benahmed, A.; Noui, Y.
    Mech-Degla, Degla-Beida and Frezza are the common (or dried) varieties studied in this research. On average, their water and sugar contents are of 15 and 80% dry basis (db), respectively. In this paper we report on their technological abilities. The experimental study consist the following: complementary vacuum (200 mbars) air-drying at 60°C, soaking in citrus juices, double fermentation (alcoholic and acetic) and water-alcohol extract preparation. The three previously quoted varieties show an interesting drying ability since they water content has been reduced to 5-7% (db) without apparent browning, which allows the possibility to produce first fruit powder then tablets. In order to formulate biologic vinegar and to optimize the traditional process as has traditionally applied in Algerian Sahara, the dates have been submitted to the spontaneous double fermentation: alcoholic and acetic. Using oxygenation during 4 h after 14 days of anaerobic fermentation, the acetic acid content reaches a value above 7 g/100 mL (in the Mech-Degla case). The swelling power (more than 50% in relation to the initial fruit`s weight) of Mech-Degla dates immerged in citrus juices as well as the brix degree variation in liquid phase (on average 25%) were also analyzed. Results indicate also the possibility to produce the dates in their auto induced syrup. In addition, the water-alcohol extract obtained reveals an antioxidant activity of about 52%