2014, Vol. 2, Issue 4, Part A

author(s)
Mohamed Ayad Berfad, Tarig M. S. Alnour

abstract
This study was conducted in the faculty of Art and sciences and aimed to determine the chemical composition of the seagrass Posidonia oceanica using Ethyl acetate, Chloroform, Ethanol, Cyclohexan and Acetone and to determine the antibacterial activity of the crude extracts against: Staphylococcus aureus, Salmonella typhi, Pseudomonas aeruginosa, Proteus mirabilis, Klebsiella pneumoniae and Escherichia coli. The seagrass was collected, identified, washed, dried, grind and exposed to extraction by soxhlet apparatus, and the crude extracts was subjected to chemical reaction and agar disk diffusion method to detect the presence of the chemical compounds and antimicrobial susceptibility tests. Posidonia oceanica possess several chemical compounds including: alkaloids, flavanoides, phenols, tannins, saponins, phlobatannins, sterols, proteins, reducing sugars, polysaccharides, and resins which differ in concentration according to the solvent used and has potent antimicrobial activity against Pseudomonas aeruginosaand Staphylococcus aureus with variable activity against other used bacterial strains.