Resumen del producto

Because chemical composition of seaweed may vary seasonally, the objective of this study was to describe a bimonthly variation in the chemical composition and in the bioactivities and properties of the extracts obtained from blades and stipes of Eisenia arborea collected in Magdalena Bay, Mexico, over a period from September 2013 to July 2014. The proximate chemical analysis was carried out on dry milled algal samples and showed that the major constituents in both blades and stipes were carbohydrates (53.85 and 47.65 %, respectively) and ashes (28.44 and 33.90 %). The crude ethanolic extract (EtOH) yield was higher (p<0.05) in blades (3.25 %) than in stipes (1.3 %); this was also true for antioxidant activity (AAOX). September and November showed the highest EtOH yields (5.40 & 4 %) and AAOX (EC50= 82.7 & 55 ?g mL-1) in blades, while in stipes May showed the highest EtOH yield (2.07 %) and AAOX (EC50=320.3 ?g mL-1). The yield of crude fucoidan obtained from blades was higher (p0.05) within blades and stipes. Both blades and stipes showed the highest yield from November to March with a mean of 20.28 % and 22.52 for blades and stipes respectively. The highest viscosity and gel strength were determined in January in both blades (464 m Pa s y 3239 g cm-2) and stipes (1008 m Pa s y 3336 g cm-2). Our results suggest that the period from November to March is the best for collecting the algae due to highest yields and bioactivity and better properties of extracts. We suggest using only blades when a major yield of EtOH and fucoidan are needed. Moreover, if alginates are resource of interest, using both blades and stipes is recommended, because of the unique properties of each alginate.

Palabras clave: alginate; Eisenia arborea; Chemical composition; Fucoidan

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