Polyunsaturated ω-3 and ω-6 fatty acids, total carotenoids and antioxidant activity of three marine microalgae extracts obtained by supercritical CO2 and subcritical n-butane

[Display omitted] •Subcritical n-butane extracted more PUFA ω3 and ω6 than supercritical CO2.•Subcritical n-butane is a promising alternative method for algal lipid extraction.•Higher eicosapentaenoic acid content was obtained when n-butane extraction was used.•Significant correlation between antiox...

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Bibliographic Details
Published in:The Journal of supercritical fluids 2018-03, Vol.133, p.437-443
Main Authors: Feller, Rafael, Matos, Ângelo P., Mazzutti, Simone, Moecke, Elisa H.S., Tres, Marcus V., Derner, Roberto B., Oliveira, José V., Junior, Agenor F.
Format: Article
Language:English
Subjects:
Extraction method
Food and pharmaceutical applications
Liquefied gas
Nannochloropsis oculata
Phaeodactylum tricornutum
Porphyridium cruentum
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Summary:[Display omitted] •Subcritical n-butane extracted more PUFA ω3 and ω6 than supercritical CO2.•Subcritical n-butane is a promising alternative method for algal lipid extraction.•Higher eicosapentaenoic acid content was obtained when n-butane extraction was used.•Significant correlation between antioxidant activity and carotenoid content was found. Microalgae are one of the most promising sources for new functional food products, due to their ability to synthesize polyunsaturated fatty acids, pigments and natural antioxidants (e.g. carotenoids and phenolic compounds). The aim of this study was to compare the fatty acid composition, total carotenoids and antioxidant activity of Phaeodactylum tricornutum, Nannochloropsis oculata, and Porphyridium cruentum extracts obtained from supercritical CO2 (SC-CO2) and subcritical n-butane extraction methods SC-CO2 method was selective in extract saturated fatty acids (SFAs) for all microalgae species studied. On the other hand, subcritical n-butane was shown to be an excellent and powerful method to extract polyunsaturated fatty acids (PUFAs ω3+ω6). Regarding to total carotenoids and antioxidant activity using DPPH scavenging assay a significant correlation coefficient (R2=0.80) was found among the extracts independent of the extraction method tested. This indicates that carotenoid compounds might be the major contributor to the antioxidant capacities of these microalgae.
ISSN:0896-8446
1872-8162
DOI:10.1016/j.supflu.2017.11.015