Journal
MARINE DRUGS
Volume 17, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/md17020090
Keywords
algae; drying; pigments; phenolic compounds; antioxidant activity; polysaccharides
Categories
Funding
- R&D Co-promotion project [POCI-01-0247-FEDER-003419]
- European Regional Development Fund through the Competitive and Internationalization Thematic Operational Program under the Portugal 2020 Program
- Science and Technology Foundation/Ministry of Education and Science (FCT/MEC) [FCT UID/QUI/00062/2019]
- European Regional Development Fund (FEDER), within the Portugal 2020
- Project AgroForWealth - Centro2020, through FEDER [CENTRO-01-0145-FEDER-000001]
- Project AgroForWealth - Centro2020, through PT2020 [CENTRO-01-0145-FEDER-000001]
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The effect of oven-drying at 25, 40 and 60 degrees C was evaluated on three macroalgae of relevance in Europe, namely Ulva rigida, Gracilaria sp. and Fucus vesiculosus, with respect to quality aspects, including their potential to be exploited as a source of valuable compounds. Notably, as compared to freeze-drying, oven-drying at 25 degrees C promoted the extraction of chlorophylls and carotenoids from U. rigida, as well as those of phycoerythrin and chlorophyll a from Gracilaria sp., while 40 degrees C favored the recovery of fucoxanthin and pheophytin a from F. vesiculosus. On the other hand, the use of oven-drying had a negative impact on the extraction of phenolic compounds from this alga, also diminishing the antioxidant activity of the resulting extracts. Instead, the impact of oven-drying of raw material on the recovery of specific polysaccharides differed among the macroalgae. While the amounts of ulvans and fucoidans obtained from macroalgae dried at higher temperatures tended to be superior, the recovery of agar was not affected with the drying temperatures applied to Gracilaria sp. The overall results showed that oven-drying might serve as a good alternative to stabilize Ulva rigida, Gracilaria sp. and Fucus vesiculosus, especially if extraction of pigments and polysaccharides is aimed, thought the appropriate temperature applied must be adapted for each macroalgae.
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