Review Article
Determination of Microalgal Lipid Content and Fatty Acid for Biofuel Production
Table 2
Comparisons between conventional organic solvents extraction and CO2-based solvents extraction approaches.
| Items | Organic solvent | scCO2 | lCO2 |
| Heavy metal contamination | Unavoidable | Free of heavy metals | Free of heavy metals | Inorganic salt content | Difficult to avoid | Free of inorganic salts | Free of inorganic salts | Selectivity | Poor selectivity | Highly selective | Highly selective | Extracted compounds | Polar and nonpolar compounds | Nonpolar compounds | Nonpolar compounds | Safety | Flammable and/or toxic | Nontoxic and nonflammable | Nontoxic and nonflammable | Operation condition | Regular temperature and pressure | High temperature and pressure | Lower temperature and pressure than scCO2 | Recycling | Solvent recovery is expensive | CO2 could be recycled and reused | CO2 could be recycled and reused | Operation cost | High power consumption (in solvent recovery) | High power consumption | Lower than scCO2 | Extraction time | Time-consuming | Shorter than solvent extraction | Shorter than solvent extraction |
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