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Seasonal nutritional profile of Gelidium corneum (Rhodophyta, Gelidiaceae) from the center of Portugal
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Advisor(s)
Abstract(s)
Gelidium corneum is a well-known agarophyte, harvested worldwide for its high agar quality. However, the species also exhibits an interesting nutritional profile, but with seasonal variations. Therefore, to evaluate the nutritional value of G. corneum, ash, crude protein, total lipids, and
carbohydrates were analyzed at different times of the year. The heavy metals mercury, arsenic, lead,
cadmium, and tin, as well as iodine were also measured. Finally, the seasonal antioxidant capacity
of G. corneum extracts was evaluated. Our results indicate that the biomass is rich in protein (up to
16.25 ± 0.33%) and carbohydrates (up to 39.5 ± 3.29%), and low in lipids (up to 2.75 ± 0.28%), and
especially in the summer, the AI, TI indexes, n-6/n-3 and h/H ratios (0.93, 0.6, 0.88 and 1.08, respectively) are very interesting. None of the contaminants exceeded the legally established limits, and
the iodine values were adequate for a healthy diet. Finally, the antioxidant capacity is fair, with the
DPPH ≤ 10.89 ± 1.46%, and ABTS ≤ 13.90 ± 1.54% inhibition, FRAP ≤ 0.91 ± 0.22 AAE.g−1, and TPC
≤ 6.82 ± 0.26 GAE.g−1. The results show that G. corneum is an attractive resource, with potential use
as food or as a food supplement.
Description
Funding: Funded by Fundação para a Ciência e Tecnologia (FCT), through the strategic project UIDB/04292/2020 granted to MARE and the project Operational Programme MAR2020 through the project MAR-04.03.01-FEAMP-0101–Limo do Cais. FCT also supported this research through the individual doctoral grant UI/BD/150957/2021 attributed to M.V.F.
Keywords
Red seaweeds Total protein Carbohydrates Total lipids Heavy metals Antioxidant capacity Seasonal variations