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Impact of harvesting method on total lipid content and extraction efficiency for Phaeodactylum tricornutum
Vandamme, D.; Gheysen, L.; Muylaert, K.; Foubert, I. (2018). Impact of harvesting method on total lipid content and extraction efficiency for Phaeodactylum tricornutum. Separation and Purification Technology 194: 362-367. https://dx.doi.org/10.1016/j.seppur.2017.10.035
In: Separation and Purification Technology. ELSEVIER SCIENCE BV: Amsterdam. ISSN 1383-5866; e-ISSN 1873-3794, more
Peer reviewed article  

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Keyword
    Marine/Coastal
Author keywords
    Flocculation; Dewatering; Microalgae; Biofuels; FAME; Lipid extraction

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Abstract
    Flocculation is a promising low-cost alternative to centrifugation for harvesting microalgae for bulk lipid production. However, little is known about the effect of the harvesting method on the lipid content on the one hand and the lipid extraction efficiency on the other hand. In this study, both total lipid content (and fatty acid composition and free fatty acid amount) and lipid extraction efficiency of Phaeodactylum tricornutum biomass were compared after harvesting using either alum or alkaline flocculation, or centrifugation. Alum and alkaline flocculation did not severely impact total lipid content when expressing results on ash-free dry weight basis to account for the salts transferred to the biomass during flocculation. The fatty acid composition does not change substantially and alum nor alkaline flocculation had any effect on the extraction efficiency when using a commercial solvent system. This study demonstrates that alkaline flocculation can be an excellent primary harvesting method for Phaeodactylum tricornutum without impacting the lipid extraction efficiency.

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