Ultrasound assisted extraction of Nannochloropsis: Effects on lipid extraction efficiency and lipid stability

Ultrasound assisted extraction of microalgal lipids from Nannochloropsis in presence of hexane/isopropanol extraction solvent was studied. The results were compared with adequate control extractions, using the same solvent system, solvent contact time and extraction temperature but in the absence of...

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Veröffentlicht in:Algal research (Amsterdam) 2024-06, Vol.80, p.103520, Article 103520
Hauptverfasser: Mienis, Esther, Vandamme, Dries, Foubert, Imogen
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Sprache:eng
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Zusammenfassung:Ultrasound assisted extraction of microalgal lipids from Nannochloropsis in presence of hexane/isopropanol extraction solvent was studied. The results were compared with adequate control extractions, using the same solvent system, solvent contact time and extraction temperature but in the absence of ultrasound. Ultrasound assisted extraction at 0.45 W/mL and control extractions at elevated temperatures (comparable to the temperature induced by the ultrasound) resulted in similar lipid, free fatty acid and pigment extraction efficiencies and the free fatty acid and pigment content of the lipid extracts was comparable. The control and ultrasound assisted extractions did not influence the lipolytic and oxidative stability of the lipids during extraction. These results indicated that the positive impact of ultrasound assisted extraction can almost completely be attributed to the ultrasound induced increased temperature. Simpler extraction techniques applying moderate heating (± 40 °C) in presence of lipid extraction solvents are most probably more straightforward to implement industrially compared to ultrasound assisted extraction. •Ultrasound assisted extraction increased Nannochloropsis lipid extraction efficiency.•Improved lipid extraction efficiency (by ultrasound) is mostly due to the temperature increase provoked.•Temperature is main parameter influencing lipid extraction efficiency.•Lipid extracts were lipolytically and oxidatively stable during extraction.•All lipid extracts had comparable composition.
ISSN:2211-9264
2211-9264
DOI:10.1016/j.algal.2024.103520