Influence of high pressure homogenization on free fatty acid formation in Nannochloropsis sp.
Balduyck, L.; Bruneel, C.; Goiris, K.; Dejonghe, C.; Foubert, I. (2018). Influence of high pressure homogenization on free fatty acid formation in Nannochloropsis sp. European Journal of Lipid Science and Technology 120(4): 1700436. https://dx.doi.org/10.1002/ejlt.201700436
In: European Journal of Lipid Science and Technology. Wiley-Blackwell: Hoboken. ISSN 1438-7697; e-ISSN 1438-9312, meer
Although Nannochloropsis lipids have many potential applications in biofuels and high value products, their extraction is limited by the tough cell wall of this species. High pressure homogenization (HPH) can be used to improve the extraction efficiency. However, this can possibly induce free fatty acid (FFA) formation, which has a negative impact on oil quality. In this study, the HPH pressure and number of passes are varied in a full factorial design to study the impact of these factors on FFA formation, lipid extraction efficiency, and fatty acid profile. It is found that substantial amounts of FFA are formed during HPH treatments when compared to the non‐disrupted biomass. The FFA formation is mostly influenced by the number of passes applied, which can explained by a combined effect of the longer time residing as a wet paste and the temperature increase during the treatment. The large amount of FFA formed during the least intensive HPH treatment is in contrast with only a slight increase of the lipid extraction efficiency, which indicates that minor damage to the cell is sufficient to induce lipolytic reactions. The relative fatty acid profile after HI extraction is not influenced by the HPH treatment.
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