4.7 Article

Biobased Solvents for Pressurized Liquid Extraction of Nannochloropsis gaditana Omega-3 Lipids

期刊

MARINE DRUGS
卷 19, 期 2, 页码 -

出版社

MDPI
DOI: 10.3390/md19020107

关键词

microalgae; alternative green extraction; omega-3 PUFA; Nannochloropsis; Isochrysis; Tetraselmis; renewable solvents; pressurized liquid extraction; ultrasound assisted extraction; glycolipids

资金

  1. Comunidad de Madrid (Spain) [P2018/BAA-4532]
  2. European Social Fund

向作者/读者索取更多资源

The study demonstrated that ultrasound assisted extraction and pressurized liquid extraction with different biobased solvents are effective methods for extracting algal lipids. By using solvent mixtures like 2-MeTHF and ethanol, efficient extraction and fractionation of lipids from microalgae biomass can be achieved with high yields.
To develop greener extraction alternatives for microalgae biomass, ultrasound assisted extraction (UAE) and pressurized liquid extraction (PLE) with different biobased solvents were investigated, demonstrating that both techniques are useful alternatives for algal lipid extraction. Specifically, Nannochloropsis gaditana lipids were extracted by UAE and PLE at different temperatures and extraction times with sustainable solvents like 2-Methyltetrahydrofuran (2-MeTHF) and its mixtures with ethanol and other alcohols. The best oil yields for both PLE and UAE of N. gaditana were achieved with the mixture of 2-MeTHF:ethanol (1:3), reaching yields of up to 16.3%, for UAE at 50 degrees C and up to 46.1% for PLE at 120 degrees C. Lipid composition of the extracts was analyzed by HPLC-ELSD and by GC-MS to determine lipid species and fatty acid profile, respectively. Different fractionation of lipid species was achieved with PLE and solvent mixtures of different polarity. Thus, for the extraction of glycolipids, ethanolic extracts contained higher amounts of glycolipids and EPA, probably due to the higher polarity of the solvent. The optimized method was applied to microalgae Isochrysis galbana and Tetraselmis chuii showing the potential of mixtures of biobased solvents like 2-methyl-THF and ethanol in different proportions to efficiently extract and fractionate lipids from microalgal biomass.

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