Browsing by Author "Gherraf, N."

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INHIBITION EFFECT OF FLAVONOID EXTRACT OF EUPHORBIA GUYONIANA ON THE CORROSION OF MILD STEEL IN H2SO4 MEDIUM
(University of Eloued جامعة الوادي, 2009-07-01) Chihi, S.; Gherraf, N.; Alabed, B.; Hameurlain, S.
The influence of flavonoids extracts of three parts of Euphorbia Guyoniana towards the corrosion of type API 5L X52 steel in 15% H2SO4 has been evaluated by weight loss method and polarization technique. The results showed that extracts are a good inhibitors for API 5L X52 steel in this medium. The corrosion inhibition efficiency increases on increasing plant extracts concentration. The inhibition is attributed to the adsorption of the surface of the metal. Potentiodynamic polarization results revealed that the studied inhibitors behave as a mixed type.
Phytochemical Analysis, Antioxidant And Antimicrobial Activities Of Leaves Extract Of Date Palm Grown In Algeria
(University of Eloued جامعة الوادي, 2012-07-01) Laouini, S. E.; Segni, L.; Ouahrani, M. R.; Gherraf, N.; Mokni, S.
In this study, we have determined the phenolic compounds, antioxidant and antimicrobial activity of methanolic extracts from three varieties of leaves tree. According to the results the leaves extracts have very important values for polyphenols (215.24 to 156.46 mg GAE / g DW) and high antioxidant activity (324. 45 to 206.21 mg GAE / g DW), DPPH (IC50 = 2.98 to 4.83 μg / ml) and β-bleaching test (IC50 = 133. 93 to 194. 12 μg / ml); also the three extracts reveal a considerable antimicrobial potency and antifungal considerable activity , the diameter of inhibition is 14.4 ± 0.6 mm for Hamraya, 19.8 ± 0.5 mm for Ghars and 17.4 ± 0.8 mm for Deglet Nour (concentration 50 mg / ml) from Staphylococcus aureus ATCC.
Reinvestigation Of Essential Oil Content Of Thapsia Garganica Grown In The East Of Algeria
(University of Eloued جامعة الوادي, 2011-07-01) Ladjel, S.; Zellagui, A .; Gherraf, N.
Thapsia garganica is a very famous medicinal plant known especially for its therapeutic effects such as diuretic, emetic and purgative. A resin is extracted with alcohol from the bark of the root. The plant has been considered specific in treating pain, though caution is advised since it is poisonous to some mammals. The plant is also strongly rubefacient, producing blisters and intense itching. In the present study, we have undertaken a Reinvestigation of essential oil content of this widely used plant because of its important bioactive effect to heal many ailments.
Scavenging Activity, Anti-inflammatory And Diabetes Related Enzyme Inhibition Properties Of Ethanol Leaves Extract Of Phoenyx Dactylifera
(University of Eloued جامعة الوادي, 2013-07-01) Laouini, S. E.; Segni, L.; Gherraf, N.; Ouahrani, M. R.; Mokni, S.
In this study we investigate the antioxidant, anti-inflammatory, and antidiabetic activities of ethanolic leaf extracts of three selected varieties of Phoenyx dactylifera L. namely: “Ghars”, “Deglet Nour” and “Hamraya”. The assessment of the antioxidant potential of crude leaf extracts, using superoxide anions inhibition, radical scavenging activity "DPPH" and total antioxidant activity essays, was carried out. Furthermore, the anti-inflammatory properties of the extracts were determined by measuring the inhibition of nitric oxide (NO) production. Moreover, the antidiabetic effect was evaluated by inhibition of α-amylase and α-glucosidase enzymes. The total phenolic content measured by Folin-ciocalteu method. The raw leaf extracts of the selected varieties were found to contain a high content of total phenolic content (342.45 mg GAE/ gDW for GE) and therefore exhibited a higher antioxidant activity and inhibitory effect of radicals scavenging activity against DPPH and superoxide anion (IC50=7.44 μg/mL and 39.11 μg/mL respectively).
The Synthesis Of (5-hydroxy-5-(1-methoxypropan-2-yl) -4-methylfuran-2(5h)-one, 5-(1-methoxypropan-2-yl) -4-methylfuran-2(5h)-one) And Biological Activity
(University of Eloued جامعة الوادي, 2011-07-01) Gherraf, N.; Tamma, N.
Butenolides are a class of lactones with a four carbon heterocyclic ring structure. They are sometimes considered as oxidized derivatives of furan. The simplest butenolide is 2-furanone, which is a common component of larger natural products and is sometimes referred to as simply "butenolide". A common biochemically important butenolide is ascorbic acid (vitamin C). The butenolide and their analogues represent a wide range of the natural compounds of medical and biological importance. In the last decades, a great number of compounds of various structures, in general from Alkylidene butenolide were isolated and showed biological activities. In this work we have studied the reactivity of some alkylidene butenolide and carried out their antibacterial activity.