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Issue 6, 2011
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Biodiesel production: the potential of algal lipids extracted with supercritical carbon dioxide

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Abstract

Supercritical carbon dioxide (scCO2) was used to extract components of interest from Scenedesmus dimorphus, a microalgae species, under varied algal harvesting and extraction conditions. Liquid chromatography-mass spectrometry (LC-MS) was used to quantify the concentration of fatty acid methyl esters (FAME) and the FAME profile of transesterified lipids, phospholipids and pigments extracted under varied supercritical temperatures and pressures. The scCO2 extraction results are compared with conventional solvent extraction to evaluate differences in the efficiency and nature of the extracted materials. Algae harvested by centrifugation (vs.lyophilization) demonstrated a similar extraction efficiency in scCO2, indicating potential energy benefits by avoiding conventional algal mass dehydration prior to extraction. Centrifuged algae and optimized extraction conditions (6000 psi; 100 °C) resulted in comparable FAME yields to conventional processes, as well as increased selectivity, reflected in the decreased pigment, nitrogen and phospholipid contamination of the FAME. Cell pre-treatments—sonication, microwave, bead beating and lyophilization—showed an enhancement in extraction yield in both conventional solvent and scCO2 extraction, allowing for improved extraction efficiencies. This study suggests that scCO2, a green solvent, shows great potential for algal lipid extraction for the sustainable production of biodiesel.

Graphical abstract: Biodiesel production: the potential of algal lipids extracted with supercritical carbon dioxide

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Publication details

The article was received on 18 Jan 2011, accepted on 24 Mar 2011 and first published on 18 Apr 2011


Article type: Paper
DOI: 10.1039/C1GC15068E
Citation: Green Chem., 2011,13, 1422-1429
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    Biodiesel production: the potential of algal lipids extracted with supercritical carbon dioxide

    L. Soh and J. Zimmerman, Green Chem., 2011, 13, 1422
    DOI: 10.1039/C1GC15068E

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