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- Bioactive compounds and antioxidant activity from Alaria esculenta cultivated on long-lines in Bantry Bay: effect of cultivation and processing methodPublication . Blanco González, Silvia; Barreira, Luísa; Moejes, Fiona WanjikuThe demand for seaweed-based products for food, pharmaceuticals and fish and cattle feed has been rising with a significant expansion of the global seaweed cultivation industry. The growing demand is driven for contaminant-free seaweed and by the commercial sector requiring seaweed-derived products for biotechnological and medical applications in countries with little traditional interest in seaweed aquaculture. Brown macroalgae contain a wide variety of bioactive compounds beneficial to health with therapeutic properties such as anticancer, anti-obesity, antidiabetic, antiviral or antibacterial activity. However, these compounds can show seasonal variations and its amount can also be affected by the extraction, isolation, and biomass processing methods used. This work aims to extract, produce fractions enriched in the compounds of interest, characterize, and analyse the antioxidant activity of extracts rich in fucoxanthin and phlorotannins, determining the effect of the drying method (oven and freeze-drying), the deployment date and the sampling date on these bioactive compounds. To achieve this, Alaria esculenta, a winter and fast-growing species, was cultivated on long-lines in Bantry Bay, Ireland. Biomass yield was calculated to assess seaweed growth and the characterization and quantification of fucoxanthin and phlorotannins was performed using Ultra-High-Performance Liquid Chromatography, followed by DPPH scavenging capacity in order to assess the antioxidant activity of the extracts. The results demonstrate that the bioactive compounds concentration is dependent on the deployment and sampling dates and that these compounds have a strong relationship with the antioxidant activity of the extracts. However, no significant differences were found when applying the two drying methods: oven-drying and freeze-drying. We have concluded that a later deployment (December) will produce a higher biomass yield in less time, with levels of fucoxanthin and phlorotannins peaking on May 5th, probably related with the presence of epiphytes and grazers. However, high variability was observed, suggesting that further studies need to be carried out to improve the sampling method.