Analysis of some chemical nutrients in four Brazilian tropical seaweeds

Resumo

Seaweeds have various chemical components with beneficial effects for human use; however, their nutritional values in Brazilian species are not well known. This study aimed to evaluate the content of water, ash, protein, carbohydrate, and lipid in four seaweeds (Hypnea musciformis, Solieria filiformis, Caulerpa cupressoides and C. mexicana). Algal constituents were determined by difference, gravimetric or colorimetric method, being the values expressed as g 100 g^-1 dehydrated weight (d.w.). Results revealed that the water (10.7 ± 0.18-15.06 ± 1.14 g 100 g^-1 d.w.), ash (7.79 ± 0.87-15.12 ± 0.51 g 100 g^-1 d.w), protein (17.12 ± 0.99-20.79 ± 0.58 g 100 g^-1 d.w.), lipid (0.33 ± 0.01-3.77 ± 0.13 g 100 g^-1 d.w.) and carbohydrate (38.07 ± 0.32-54.24 ± 0.157 g 100 g^-1 d.w.) contents varied between the species (p < 0.05). H. musciformis and S. filiformis (Rhodophyta) had highest ash contents (14.14 ± 1.23-15.12 ± 0.51 g 100 g^-1 d.w.), whereas lipids were higher for Caulerpa species (Chlorophyta) (1.52 ± 0.17-3.77 ± 0.13 g 100 g^-1 d.w.) (p < 0.05). Protein and carbohydrate were the most sources in all the species. Therefore, the studied seaweeds could be a potential source of food ingredients for diets.