Effect of Carbon Dioxide (CO2) on Lipid Production and Fatty Acids Profile Affecting on Biodiesel Properties Produced from Green Microalga, Botryococcus braunii KMITL 2
Main Article Content
Abstract
Effect of carbon dioxide (CO2) on lipid production and fatty acid composition affecting on
biodiesel properties produced from green microalga Botryococcus braunii KMITL 2 was studied. Alga
was cultivated and supplemented with 0.04, 1, 3, 5, 10, 15 and 20 % CO2 (v/v) until reached the late
exponential phase. The experimental results showed that the alga supplemented with 5% CO2 produced
significantly the highest lipid content (52.97±5.02%) and lipid productivity (72.06±0.40 mg/l/d) that
were 2.0 and 5.1 times higher than control set (0.04% CO2). The lipid yield (0.54±0.02 g/l) of the alga
supplemented with 10% CO2 was 3.6 times higher than the control, and significantly higher than others
CO2 concentrations except 5% CO2. Alga supplemented with 10% CO2 showed the highest percentage of
C10:0-C18:1 fatty acids (95.41%) with cetane number higher than 47. The alga supplemented with 5%
CO2 showed low unsaturated fatty acid which lead to long term storage of biodiesel. Considerably, the
highest lipid content and good biodiesel properties, 5% CO2 could be the optimum condition for cultivation
of this algal strain.
Article Details
King Mongkut's Agricultural Journal
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