الفهرس 
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Abstract
Alginate is a family of non-branched binary co-polymers of 1-4 glycosidically linked . D-mannuronic acid and a-L-gulurenic acid residues, the relative amount of the two uronic acid monomers and their sequential arrangement vary widely, depending on the alginate origin. The tensile properties and characteristics of alginate hydro-gels make it suitable for industrial applications, specifically, high Guluronic alginate content yielded stronger gel. The
aim of study was to isolate some useful biopolymers from Egyptian brown algae and investigate their biotechnological applications. in bio-control, water treatment (heavy metal <removal) and antimicrobial activity, especially as wound dressing.
Five brown algal species have been collected from the Egyptian Mediterranean Sea, at
Abu Quir bay. Their alginate polymer content was isolated and completely characterized by
phenol sulfuric method, IR and NMR techniques, in which Sargassum vulgare species gave
the highest Guluronic acid content. The extracted alginates were successfully examined for
inhibition of the Agrobacterium tumefaciens tumorigenic activity using potato discs anti-
turnor bioassay, in which Padina pavonia sodium alginate with high content of mannuronic
acid gave anti-tumor inhibition of 68%. Sargassum vulgare Mg-alginate gave a high capacity
for heavy metal removal from water, comparing with other legends. Antimicrobial activities
against Pseudomonas aeruginosa and Escherichia coli were evaluated to asses its possible
application as wound dressing material, especially for diabetic ulcer patients.