CEDETS

URI permanente para esta comunidad

https://digital.cic.gba.gob.ar/handle/11746/1663
Nombre: Centro de Emprendedorismo y Desarrollo Territorial Sustentable (CEDETS)
Sitio web: https://www.upso.edu.ar/cedets/
Dependencia: UPSO - CIC
Descripción: Abocado a investigar el emprendedorismo y el desarrollo local como procesos sociales tendientes a contribuir al aumento del bienestar de la comunidad, generando conocimiento original y promoviendo su aplicación para resolver las necesidades del medio.

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Examinando CEDETS por Autor "Almeyda, María Delfina"

Mostrando 1 - 2 de 2
  • Artículo
    Acceso Abierto
    Assessment of Halamphora coffeaeformis Growth and Biochemical Composition for Aquaculture Purposes
    (2020) Scodelaro Bilbao, Paola G.; Martín, Lucas A.; Popovich, Cecilia; Almeyda, María Delfina; Chamorro, Verónica; Leonardi, Patricia I.
    The vast majority of the world’s fishery by-products are utilized in the fish farming industry. However, due to the high cost and unsustainability of these by-products, alternative sources must be found. Marine diatoms produce important amounts of fatty acids, sterols, proteins and carbohydrates. In this work, we assessed the nutritional value of Halamphora coffeaeformis at the exponential growth phase, to determine its suitability for aquafeed. The strain was grown in a photobioreactor at 20 ◦C for 6 days. The production of proteins, lipids and carbohydrates was determined, and essential fatty acid, sterol and amino acid composition was assessed. The highest values of triacylglycerides (TAG), free and esterified sterols, proteins and carbohydrates were found after 6 days of growth in the photobioreactor. Fatty acid analysis by gas chromatography showed the presence of eicosapentaenoic (EPA) and arachidonic (ARA) in amounts similar to those for fish oils. In terms of sterols, a predominance of stigmasterol was observed, followed by cholesterol. The amino acid composition revealed 50% of them to be among those essential for fish and other aquatic animals. Finally, a suitable amount of carbohydrates was found in H. coffeaeformis cultures. Together, these findings support the use of H. coffeaeformis as an alternative and sustainable source for aquafeed to partially replace the use of fishery by-products.
  • Artículo
    Acceso Abierto
    Enhancement of polyunsaturated fatty acid production under low-temperature stress in Cylindrotheca closterium
    (2020) Almeyda, María Delfina; Scodelaro Bilbao, Paola G.; Popovich, Cecilia; Constenla, Diana; Leonardi,Patricia I.
    Marine microalgae synthetize great amounts of essential metabolites such as fatty acids and amino acids. In addition, their exposure to stress factors can induce the overproduction of these desirable metabolites. Thus, in this work, we assessed the effect of low-temperature stress on lipid production and composition of the diatom Cylindrotheca closterium, in order to evaluate its potential as an alternative feedstock of essential polyunsaturated fatty acids (PUFAs). The alga was first cultured in a photobioreactor at 20 °C (control), and stressed by suddenly lowering the culture temperature, from 20 °C to 11 °C, at the exponential (LTEP) or stationary (LTSP) growth phases. Neutral lipids (NLs) were the main lipid fraction of all conditions assayed, and their production was maximal at LTSP. Fatty acid analysis also showed that the greatest production of PUFAs was observed in the NL fraction at LTSP condition. In terms of essential fatty acids, the production of the omega-3 fatty acids eicosapentaenoic acid and docosahexaenoic acid was similar in both treatments. The production of omega-6 fatty acids was significantly higher in the LTSP condition due to an increase in arachidonic acid content. Sterols increased under both stress conditions, with a predominance of cholesterol. Considering that the LTSP condition elicited the best PUFA production, the amino acid composition was determined. The 46.81% of total amino acids were essential components for aquatic animals. These findings provide evidence of the potential of C. closterium as an alternative, sustainable source of sterols, essential fatty acids, and amino acids.