期刊
FOOD AND BIOPRODUCTS PROCESSING
卷 143, 期 -, 页码 21-27出版社
ELSEVIER
DOI: 10.1016/j.fbp.2023.10.003
关键词
Deep eutectic solvents (DES); Polar antisolvents; Lipid recovery; Deep eutectic solvent (DES) regeneration
This study developed a novel strategy to separate dissolved oils from imidazole/hexanoic acid mixture and regenerate the solvent using polar antisolvents. By adding small amounts of water and methanol, high recovery of lipids was achieved, while ethanol required a large amount and caused solvent dilution.
Deep eutectic solvents (DES) can be a green alternative extraction technology for microalgae lipids, acting simultaneously as a pre-treatment agent and solvent. However, due to the low vapor pressure of both DES and lipid solute, the recovery of lipids and solvent regeneration remains difficult. In this study, we developed a novel strategy to separate the dissolved sunflower and model algae oil from imidazole/hexanoic acid DES by using polar antisolvents (water, methanol, and ethanol). The polarity and the amount of antisolvent influenced the lipid solubility in DES. While the water was the strongest antisolvent, the alcohols were easier to evaporate, ensuring easy DES regeneration. By adding small amounts of water and methanol, more than 90% of the lipids were recovered in the form of high-purity oils (>90%). In the case of ethanol, a large amount of ethanol was required, which diluted the solvent-rich phase and solubilized more lipids in it. Based on three repeated cycles with the selected antisolvent methanol, > 90% of the eutectic solvent could be regenerated.
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