Abstract
Switchable solvents (SS), also termed smart solvents, have the unique ability to change their polarity/hydrophilicity through a protonation reaction using CO2. Recently, a novel method employing the use of SS for lipid extraction in microalgae has shown promising results. In this study the efficiency of the tertiary amine N, N-dimethyl cyclohexylamine (DMCHA) to extract lipids from the eukaryotic microalgae Chlorella vulgaris and Haematococcus pluvialis, was investigated using traditional hexane as a control under wet conditions. The results revealed that high lipid yields using DMCHA can be achieved in both species, however the extraction procedure is significantly more complex compared with hexane. This study found that lipid extraction of H. pluvialis, using DMCHA to be an efficient solvent, achieving a maximum lipid yield of 64.84%. Furthermore, DMCHA achieved a maximum lipid yield of 63.85% with C. vulgaris. The practicalities of DMCHA for lipid recovery are considerably more complex at larger volumes compared with hexane.
Highlights
- DMCHA is biocompatible with Haematococcus pluvialis for lipid extraction.
- Switchable solvents form globules with neutral lipids through Van-der Waal forces.
- Microalgae cell wall rigidity reduces lipid extraction efficiency.
- Switchable hydrophobic solvents are a more environmentally friendly alternative.
- H. pluvialis and C. vulgaris maximum lipid recovery using DMCHA of 64.84% and 63.85%.
List of Authors
Callum Russell, Cristina Rodriguez.