Journal
JOURNAL OF APPLIED PHYCOLOGY
Volume 32, Issue 5, Pages 3113-3122Publisher
SPRINGER
DOI: 10.1007/s10811-020-02156-7
Keywords
Microalgae; Nannochloropsis gaditana; Extraction; Polyunsaturated fatty acids; Carotenoids
Funding
- European Union's Horizon 2020 Research and Innovation Programme [727874 SABANA]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior Brasil (CAPES) [001]
- National Council for Scientific and Technological Development [CNPq 306078/2017-1]
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Extraction of carotenoids and fatty acids from microalgae is a technological bottleneck in processing. An improved extraction process was developed to scale the production of these bioproducts from Nannochloropsis gaditana. Different cell disruption methods were evaluated in terms of carotenoid release. Ethanol was substituted with isopropyl alcohol in a three-component solution of water:isopropyl alcohol:hexane (WIH), in which the extracts were separated by solution partitioning. This resulted in higher carotenoid and fatty acid recovery yields if compared with the standard method. The extraction method was replicated on a pilot scale, obtaining similar carotenoid recovery yields, higher than those of the standard method. Although fatty acid recovery was lower than that of the small-scale tests, yields above 85% were obtained. This demonstrated that the method was scalable for the extraction of high-value products from microalgae up to 10-L reactor volume. The use of isopropyl alcohol, which is cheaper than ethanol, and the separation of the solution phases by partitioning (avoiding drying) could contribute to reduce operation costs of downstream processing.
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