ISEP – CIETI – Pósteres apresentados a eventos científicos
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Browsing ISEP – CIETI – Pósteres apresentados a eventos científicos by Author "Caetano, N.S."
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- Avaliação de extratos de microalgas para potencial aplicação em alimentos funcionaisPublication . Corrêa, P.S.; Freitas, M.M.A.; Caetano, N.S.(Introdução) Microalgas são micro-organismos fotossintéticos, que para além de servirem como fonte de proteínas, também são capazes de produzir uma gama de compostos bioativos, tais como, pigmentos, lípidos e compostos fenólicos. Tais características as tornam bastante promissoras para aplicação de suas biomassas em alimentos funcionais (Pina-Pérez et al., 2019). De modo geral, os alimentos funcionais além de terem elevado valor nutricional, também trazem algum benefício à saúde. Chromochloris zofingiensis, Koliella longiseta e Schizomeris leibleinii são microalgas de água doce, relativamente pouco estudadas na literatura, mas potencialmente interessantes para produção de carotenoides, lípidos e compostos fenólicos (Fogliano et al., 2010; Zhang et al., 2021). A imposição de condições de estresse abiótico (i.e. variação na concentração de determinado nutriente no meio de cultivo, temperature, pH, etc.), é uma das estratégias mais utilizadas para induzir uma maior produção de determinado composto de interesse (Suparmaniam et al., 2024). Desta forma, este trabalho se propôs a estudar o impacte de diferentes condições de cultivo na produção de carotenoides, clorofilas, lípidos e compostos fenólicos. Além disso, foram produzidos extratos em solventes diferentes (i.e. água e etanol) e testado o potencial antioxidante de cada um.
- Exploring the antioxidant potential of Lobosphaera sp. and Odontella sp. biomasses under different extraction and preservation conditionsPublication . Corrêa, P.S.; Coimbra, R.S.T.; Caetano, N.S.Microalgae 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.
- Increase in antioxidant activity of Nannochloropsis sp. through stress cultivation conditionsPublication . Coimbra, R.S.T.; Corrêa, P:S.; Saraiva, J.A.; Lemos, Á. T.; Tavares, J.; Caetano, N.S.(Introduction) Nowadays, there is a great demand on the use of microalgae, or their derivatives, as novel foods or food ingredientes. Microalgal supplements provide an optimal solution to balance the diet of people who do not consume fish, promoting a healthy diet and reducing metabolic and aging pathologies with an environmentally and economically sustainable approach (1). The genus Nannochloropsis sp. has a high content of antioxidants, specific vitamins, PUFAs (in particular EPA) and is suitable for intensive culture thus being a good candidate for human consumption (1). This research work was done under the scope of the project Nº 33784: EXTRATOTECA – High Value Added Microalgae Extracts.