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Inhibition of lipolytic reactions during wet storage of T-Isochrysis lutea biomass by heat treatment

Balduyck, Lieselot, Dejonghe, Céline, Goos, Peter, Jooken, Etienne, Muylaert, Koenraad, Foubert, Imogen
Algal research 2019 v.38 pp. 101388
biofuels, biomass, carotenoids, enzymes, fatty acid composition, free fatty acids, heat treatment, lipid content, lipids, microalgae, peroxide value, storage temperature
Microalgal lipids have a huge potential in several applications such as biofuels, food and feed. However, enzymatic lipolytic reactions during wet storage cause the formation of substantial amounts of free fatty acids (FFA), which give several problems for these applications. In this study, a full factorial (32) design with varying time and temperature was used to optimize a heat treatment, that inactivates lipolytic enzymes in the wet paste of T-Isochrysis lutea. Therefore, the FFA and lipid content were evaluated at three time points (0, 3 and 7 days) during wet storage at 4 °C. A treatment of at least 8 min at 80 °C was found to inactivate the lipolytic enzymes. A second experiment elucidated that this optimal treatment had no negative impact on fatty acid composition, peroxide value, phenolic content or carotenoid content. A short heat treatment, thus, enables wet storage of microalgal paste to several days at 4 °C.