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Comparative Study of Conventional, Microwave-Assisted and Supercritical Fluid Extraction of Bioactive Compounds from Microalgae: The Case of Scenedesmus obliquus

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dc.contributor.author Georgiopoulou, Ioulia
dc.contributor.author Louli, Vasiliki
dc.contributor.author Magoulas, Kostis
dc.date.accessioned 2023-10-11T13:57:38Z
dc.date.available 2023-10-11T13:57:38Z
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/58156
dc.identifier.uri http://dx.doi.org/10.26240/heal.ntua.25852
dc.rights Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα *
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/gr/ *
dc.subject microalgae en
dc.subject solid–liquid extraction en
dc.subject microwave-assisted extraction en
dc.subject supercritical fluid extraction en
dc.subject phenolic compounds en
dc.subject carotenoids en
dc.subject chlorophylls en
dc.subject antioxidant activity en
dc.title Comparative Study of Conventional, Microwave-Assisted and Supercritical Fluid Extraction of Bioactive Compounds from Microalgae: The Case of Scenedesmus obliquus en
heal.type journalArticle
heal.language en
heal.access free
heal.recordProvider ntua el
heal.publicationDate 2023-05-04
heal.bibliographicCitation Georgiopoulou, I., Louli, V., & Magoulas, K., Comparative Study of Conventional, Microwave-Assisted and Supercritical Fluid Extraction of Bioactive Compounds from Microalgae: The Case of Scenedesmus obliquus. Separations, 10(5), 290, MDPI, 2023. en
heal.abstract The recovery of bioactive products with green processes is a critical topic for the research and industry fields. In this work, the application of solid–liquid (SLE), microwave-assisted extraction (MAE) with aq. ethanol 90% v/v and supercritical fluid extraction (SFE) with CO2 for the recovery of biocomponents from Scenedesmus obliquus is studied. The effects examined were temperature (30–60 °C), time (6–24 h), and solvent-to-biomass ratio (20–90 mLsolv/gbiom) for SLE, temperature (40–60 °C), time (5–25 min), solvent-to-biomass ratio (20–90 mLsolv/gbiom), and microwave power (300–800 W) for MAE, and temperature (40–60 °C), pressure (110–250 bar), solvent flow rate (20–40 gsolv/min), and cosolvent presence (0, 10% w/w ethanol) for SFE in relation to the extract’s yield, phenolic, chlorophyll, carotenoid content, and antioxidant activity. The optimum extraction conditions determined were 30 °C, 24 h, and 90 mLsolv/gbiom for SLE, 60 °C, 5 min, 90 mLsolv/gbiom, and 300 W for MAE, and 60 °C, 250 bar, and 40 gsolv/min for SFE. Additionally, a kinetic SFE study was conducted and the obtained results were satisfactorily correlated using Sovová’s model. The comparison between the methods proved MAE’s efficiency in all terms compared to SLE. Moreover, SFE was accompanied with the lowest yield and chlorophyll content, yet led to an increased carotenoid content and improved antioxidant activity. Finally, the cosolvent addition significantly improved SFE’s yield and led to the most superior extract. en
heal.sponsor The implementation of the doctoral thesis of the author Ioulia Georgiopoulou was co-financed by Greece and the European Union (European Social Fund-ESF) through the Operational Program “Human Resources Development, Education and Lifelong Learning” in the context of the Act “Enhancing Human Resources Research Potential by undertaking a Doctoral Research” Sub-action 2: IKY Scholarship Program for PhD candidates in Greek Universities. en
heal.publisher MDPI en
heal.journalName Separations en
heal.journalType peer-reviewed
heal.fullTextAvailability false
dc.identifier.doi https://doi.org/10.3390/separations10050290 el


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Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα Except where otherwise noted, this item's license is described as Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα