Cupo, Adelaide (2021) Heterotrophic cultivation of microalgae: metabolism and biotechnological applications. [Tesi di dottorato]


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Item Type: Tesi di dottorato
Resource language: English
Title: Heterotrophic cultivation of microalgae: metabolism and biotechnological applications
Date: 26 July 2021
Number of Pages: 213
Institution: Università degli Studi di Napoli Federico II
Department: Biologia
Dottorato: Biologia
Ciclo di dottorato: 33
Coordinatore del Corso di dottorato:
Esposito, SergioUNSPECIFIED
Date: 26 July 2021
Number of Pages: 213
Keywords: heterotrophy, diatoms, lipids
Settori scientifico-disciplinari del MIUR: Area 05 - Scienze biologiche > BIO/04 - Fisiologia vegetale
Date Deposited: 26 Jul 2021 12:23
Last Modified: 07 Jun 2023 11:25

Collection description

This PhD thesis aims to explore the biotechnological potential of the marine diatom Cyclotella cryptica grown under heterotrophic growth conditions. Diatoms are microorganisms generally cultivated in autotrophy, representing an important green source of valuable bio-products, like vitamins, pigments, omega-3 fatty acids and biofuels. However, there are significant limitations associated with autotrophic cultivation of microalgae on large scale, such as light supply and seasonal fluctuations, that affects overall costs. On these grounds, we decided to explore the heterotrophic growth condition that appears to be interesting for the development of commercial products of interest. In this way, all the light dependence constraints would be completely eliminated, by using the fermenter technology already consolidated in the pharmaceutical field at industrial scale. The process could be well controlled in terms of pH, temperature, addition and consumption of nutrients and maintenance of axenicity. The identification of candidate species and strains that have a high potential to grow in heterotrophy, as well as the improvement of culture conditions, represent a major challenge for biotechnology research. We chose Cyclotella cryptica as a model, due to its metabolic plasticity, robustness and the potential of obtainable products as reported in the Aquatic Species Program (ASP) funded by the US Department of Energy. The thesis is developed on several levels, conceptually grouped into three parts: the first one described the assessment of heterotrophic culture conditions and the behavior of C. cryptica grown in dark, the second part explores the potential products obtainable from the heterotrophic growth of C. cryptica and the last one give insights into the lipid pathway, through -omics analysis.


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