Asian Science Citation Index is committed to provide an authoritative, trusted and significant information by the coverage of the most important and influential journals to meet the needs of the global scientific community.  
ASCI Database
308-Lasani Town,
Sargodha Road,
Faisalabad, Pakistan
Fax: +92-41-8815544
Contact Via Web
Suggest a Journal
 
Articles by Hanaa H. Abd El-Baky
Total Records ( 2 ) for Hanaa H. Abd El-Baky
  Hanaa H. Abd El-Baky , Farouk K. El Baz and Gamal S. El-Baroty
  The effect of nitrogen limitation and salt stress on total lipid and unsaponifiable contents as well as fatty acid composition of Dunaliella salina were studied. The contents of total lipids, unsaponifiables and fatty acid composition were basically depend on NaCl and nitrogen concentration in the culture. The highest yield of total lipids (37.69%) and unsaponifiables (29.02%) was obtained in cells grown at 16% NaCl combined with 2.5 mM nitrogen. While, minimum yield occurred in cells grown in a culture containing 8% NaCl and 5 mM N. Cells grown at 16% NaCl combined with 2.5 mM N produced relatively higher proportion of polyunsaturated fatty acids (PUFAs), in particular C18:3w3 and C16:4w3. Increasing NaCl combined with decreasing N levels in the growth medium increased the total unsaturated fatty acids (TU) at the expense of total saturated fatty acids. At higher salinity, the total amounts of carotenoids and α-tocopherol in unsaponifiable fraction were significantly increased to reaching up to 12.03 and 4.10%. The results obtained suggest that D. salina cells containing high amount of total lipid, rich in w3 polyunsaturated fatty acids and antioxidant compounds in unsaponifiable lipid fraction may used as a supplemental ingredient or as a complete food to enhance the performance and state of the human body or improve a specific bodily function.
  Ahmed M. Aboul-Enein , Farouk K. El Baz , Gamal S. El-Baroty , A.M. Youssef and Hanaa H. Abd El-Baky
  The antioxidant of seven algal extracts was evaluated by decrease the thiobarbituric acid reactive substance (TBARS) produced from lipid peroxidation of liver microsomes induced by Fe++/ascorbate, Fe++/H2 O2 and CCl4 model systems. All algal extracts had significant effect to prevent the production of TBARS in all oxidizing model systems and this phenomenon was increased by increasing their concentration. The values of inhibition % of TBARS generate from Fe++/ascorbate, Fe++/H2 O2 and CCl4 model system by Dunaliella salina were 100, 94.43 and 90.9% respectively, (at 15 min) at concentration level 200 ppm, while the inhibition values were 98.49, 89.8 and 88.8% at 100 ppm. This extract possesses higher antioxidant activity with average 2 times than the BHT at the same concentration level (100 ppm). On the other hand, mutant strains extract of Scenedesmus dimorphus, Scenedesmus acutus and Chlorella ellipsoida showed higher antioxidant activity than the normal cells extracts. The most of all algal extracts showed more potent as an antioxidant than the BHT which, is one of the powerful synthetic antioxidant agent. The antioxidant activity of algal extract and BHT against the induced lipid peroxidation in all model system were in the following descending order: Dunaliella salina > Sc. dimorphus mutant = Chlorella mutant > Sc. dimorphus normal > Chlorella normal > Sc. acutus (mutant) > Sc. acutus (normal) > BHT. The antioxidant activity of algal extracts on induced lipid peroxidation in different model system was dependent on the chemical composition of their extracts which containing mainly the carotenoids, tocopherol and vitamin C. These substances can protect lipid peroxidation in all model system by different mode of action. Therefore, micro algae extracts inhibited the lipid peroxidation products by scavenging reactive oxygen species (OH, O¯ and 1O2) and chain reaction breaking consequently its protect bodies from harmful effect of their substances.
 
 
 
Copyright   |   Desclaimer   |    Privacy Policy   |   Browsers   |   Accessibility