Characterization of the alginates from algae harvested at the Egyptian Red Sea coast.
The alginates from five species of brown algae from the Egyptian Red Sea coast, namely: Cystoseira trinode, Cystoseira myrica, Sargassum dentifolium, Sargassum asperifolium, and Sargassum latifolium, were isolated and their compositions and structures studied by 1H NMR spectroscopy. All the alginates studied contain more guluronic acid (G) than mannuronic acid (M) and have a homopolymeric block-type structure (eta<1). The intrinsic viscosity of the alginate samples range from 8.6 to 15.2 and the gel strength ranges from 10.97 to 15.51. The constitutional G- and M-blocks of alginates from two different species (C. trinode and S. latifolium) were separated after partial acid hydrolysis. The 1H NMR spectral data of the blocks GG and MM obtained by chemical fractionation were compared with those of polymeric alginates. The monomeric uronic acids were separated by complete acid hydrolysis of S. asperifolium alginate and the G and M monomers were characterized by 1H, 13C NMR spectroscopy as well as by paper electrophoresis.
Department of Biotechnology, Faculty of Chemistry and Biology, Norwegian University of Science and Technology (NTNU), Trondheim, Norway.
Bjorn
B
Larsen
Dalia M S A
DM
Salem
Mohammed A E
MA
Sallam
Morcos M
MM
Mishrikey
Ali I
AI
Beltagy
D000464:Alginates / Q000737:chemistry*; D000818:Animals; D002241:Carbohydrates / Q000032:analysis / Q000737:chemistry; D002854:Chromatography, Paper; D004534:Egypt; D005643:Fucose / Q000032:analysis / Q000737:chemistry; D005782:Gels / Q000737:chemistry; D006603:Hexuronic Acids / Q000032:analysis / Q000737:chemistry; D006868:Hydrolysis; D019156:Indian Ocean; D009682:Magnetic Resonance Spectroscopy; D000459:Phaeophyceae / Q000737:chemistry* / Q000145:classification; D019800:Phenol / Q000737:chemistry; D013464:Sulfuric Acids / Q000737:chemistry; D014783:Viscosity
D000464:Alginates; D002241:Carbohydrates; D005782:Gels; D006603:Hexuronic Acids; D013464:Sulfuric Acids; C007896:guluronic acid; D005643:Fucose; D019800:Phenol; C008324:mannuronic acid; C033158:sulfuric acid