Corrêa, P.S.Coimbra, R.S.T.Caetano, N.S.2024-03-192024-03-192023Corrêa, P.S., Coimbra, R.S.T., & Caetano, N.S. (2023, June 21-22). Exploring the antioxidant potential of Lobosphaera sp. and Odontella sp. biomasses under different extraction and preservation conditions [Poster]. Seagriculture 2023 - 12th International Seaweed Conference EU, Trondheim, Norwayhttp://hdl.handle.net/10400.22/25199Microalgae has aroused academic and industrial interest due to the great variety of biomolecules present in their biomasses, in addition to other products released to the extracellular medium during cultivation [1]. Lobosphaera sp. is a freshwater green alga known to accumulate large amounts of polyunsaturated fatty acids (PUFAs), especially arachidonic acid (ARA, ω-6) [2]. In contrast, Odontella sp. is a marine diatom that has been reported as a potential source of fucoxanthin and eicosapentaenoic acid (EPA, ω-3). Also producing chrysolaminarin (β-1,3-glucan) as a storage polysaccharide, which has a high capacity to scavenge hydroxyl radicals [3]. Nevertheless, other antioxidants can be obtained through ethanolic extraction of some polar compounds (e.g., phenols, flavonoids, chlorophylls) [4]. Under specific conditions Lobosphaera sp. and Odontella sp. were able to produce extracts with considerable amounts of phenolic compounds, 11.5 and 20.9 mg GAE·g-1, respectively. Interestingly, studies have suggested that phenolic compounds have the main effect on total antioxidant activity when compared to carotenoids and tocopherols, for example [5,6]. Finally, the ferrous-ion chelating ability (FICA) and DPPH• radical scavenging activity (RSA) of ethanolic extracts obtained from these genera were also investigated, varying from 43 to 60 % and 1 to 9 %, respectively.engAntioxidantsLobosphaera sp.Odontella sp.BiomassExtractionPreservationconference object