In search of pharmaceutically active products to control type 2 diabetes, five brown seaweeds (Silvetia compressa, Cystoseira\nosmundacea, Ecklonia arborea, Pterygophora californica, and Egregia menziesii) from the Northwest Mexican Pacific coast were\ninvestigated. Proximate composition and total polyphenol content (TPC) as phloroglucinol equivalents (PGE) were determined\nfor the five seaweed powders and their respective hydroethanolic (1 : 1) extracts. Extracts were screened for their radical scavenging\nactivity (DPPH and ORAC) and glycosidase inhibitory activity. HPLC-DAD, HPLC-MS-TOF, and ATR-FT-IR methodologies\nwere used to identify the most abundant phlorotannins and sulfated polysaccharides in the extracts. Hydroethanolic extracts\ncontained minerals (17 to 59% of the dry matter), proteins (4 to 9%), ethanol-insoluble polysaccharides�����
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