Browsing by Author "Djemoui, A"

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    INFLUENCE OF PHENOLIC COMPOUNDS ON ANTIOXIDANT CAPACITY OF LEAVES EXTRACTS OF MORINGA OLEIFERA FROM TAMANRASSET REGION
    (university of el oued/جامعة الوادي, 2019-01-01) Djemoui, D; Saidi, M; Rahmani, Z; Djemoui, A
    In the present research the crude extract and all fractions of Moringa oleifra leaves grown in Tamanrasset, were examined for its antioxidant activities by using three different assays such as DPPH scavenging activity, superoxide anion scavenging activity and phosphomolybdenum capacity.The quantitative estimation of total phenolics, flavonoids and tannins content additionally was calculated by spectrophotometric methods.The results showed that the extracts contained total phenolic compound at concentration of 32.985±0.07 to 309.418 ± 0.71 (mg GAE/g EW) and higher total flavonoids contents of 5.192 ± 0.17 to 44.695 ± 0.23 (mg QE/g EW), for total tannins contents of 3.864 ±0.07 to 15.148 ± 0.66 (mg/g). It also this experiment found out that each extract confirmed a good antioxidant. Consequently, it can be concluded that the phenolic compounds content may be answerable for the good activities of Moringa oleifra leaves.
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    SYNTHESIS, CHARACTERIZATION AND SWELLING STUDY OF PGMA HYDROGEL BASED ON POLY (GLYCIDYL METHACRYLATE)
    (university of el oued/جامعة الوادي, 2018-09-01) Souli, L; Lahrech, M.B; Djemoui, A
    The PGMA hydrogel studied in this work was prepared by physical cross-linking of poly (glycidyl methacrylate) (PGMA) at 50-55°C without cross-linking agent. The PGMA was synthesized by ring opening polymerization of glycidyl methacrylate (GMA) in presence of Maghnite-H+ as an catalyst at room temperature. The PGMA hydrogel synthesized was characterized by FT-IR, by X-ray diffraction (XRD), by scanning electron microscope (SEB) and by swelling measurements. The results obtained by X-ray diffraction, showed that the PGMA hydrogel formed by two structures, a crystalline structure and an amorphous structure. Scanning electron microscopy (SEM) analysis indicated that a porous structure of PGMA hydrogel. The equilibriums water content (EWC) obtained were 74.81% at 20°C, 79.38% at 40°C and 85.81% at 60°C.