title: [Chemical composition and seasonal fluctuations of the edible green seaweed, Monostroma undulatum, Wittrock, from the Southern Argentina coast].
abstract: The chemical composition of green seaweed, Monostroma undulatum, Wittrock, growing in the Southern Argentina coast, was studied. Samples were collected in Puerto Deseado, province of Santa Cruz (47 degrees 45'L.S., 65 degrees 55'L.W.), from October to December 1999 and 2000. It has been analyzed six sample during this period. Algae were washed with sea water and dried at room temperature for 24 hs. Moisture, nitrogen, lipids and ashes were determined according to AOAC; fiber (total, soluble and insoluble), according to Lahaye. After mineralization with nitric acid, sodium and potassium were determined by flame photometry, calcium by complexometric method, and phosphorus by Gomori's method. The ranges expressed per 100 g dry algae were: protein (Nx6.25): 12.89-21.85; ashes (g): 33.92-40.05; lipid (g): 0.32-1.47; total fiber (g): 14.36-19.6; digestible carbohydrates (calculated by difference) (g): 20.86-32.48; sodium (g): 7.39-13.11; potassium (g): 1.38-3.18; calcium (mg): 149-226; phosphorus (mg): 190-447; Vitamin C (mg): 159-455. These results show that this green seaweed is an important source for protein, fiber, macronutrients minerals and vitamin C, during the macroscopic period. There was an important fluctuation that must be taken into account to consider the commercial collection to use it in human nutrition.
authors.affiliation: Universidad Nacional de la Patagonia San Juan Bosco, Comodoro Rivadavia, Argentina.
authors.forename: Susana
authors.initials: S
authors.lastname: Risso
authors.forename: Carlos
authors.initials: C
authors.lastname: Escudero
authors.forename: Silvia
authors.initials: S
authors.lastname: Estevao Belchior
authors.forename: María Luz
authors.initials: ML
authors.lastname: de Portela
authors.forename: María Angélica
authors.initials: MA
authors.lastname: Fajardo
mesh_terms: D001118:Argentina; D001205:Ascorbic Acid / Q000032:analysis*; D000460:Chlorophyta / Q000737:chemistry*; D004043:Dietary Fiber / Q000032:analysis; D006801:Humans; D008903:Minerals / Q000032:analysis*; D009751:Nutritional Requirements; D009753:Nutritive Value; D012621:Seasons; D012624:Seaweed / Q000737:chemistry*
chemical_list: D004043:Dietary Fiber; D008903:Minerals; D001205:Ascorbic Acid