Evaluation of Oil Producing Potential of a New Isolate—<i>Chlorella lewinii</i> SUB3545914 for Biodiesel Production under Heterotrophic Cultivation — Oak Academic Publishing
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Evaluation of Oil Producing Potential of a New Isolate—<i>Chlorella lewinii</i> SUB3545914 for Biodiesel Production under Heterotrophic Cultivation
Department of Microbiology, University of Agriculture, Makurdi, Nigeria
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Department of Microbiology, University of Nigeria, Nsukka, Nigeria
1 Department of Microbiology, University of Agriculture, Makurdi, Nigeria
2 Department of Microbiology, University of Nigeria, Nsukka, Nigeria
Microalgae with high oil productivities are most desired in biodiesel production. Chlorella lewinii SUB3545914, was isolated and assessed for its growth rates, lipid productivities and fatty acid profiles under heterotrophic cultivation. The alga was isolated after enrichment in BG-11 medium (pH = 7.3) under a light intensity of approximately 17.5 μE·m -2 ·s -1 at 30°C ± 2°C. In addition to morphology, polymerase chain reaction (PCR) and metagenomics were used for isolate identification. The DNA was sequenced and multiple sequence alignment of the BLASTED results revealed 95% similarity to Chlorella lewinii . Maximum growth (3.15 ± 0.06 g·L -1 ), lipid content (44.0%) and lipid volumetric productivities (118.80 ± 3.02 mg·L -1 ·day -1 ) in glucose supplemented media were more appreciable in comparison with the glycerol counterparts. Similarly, the highest growth (2.03 ± 0.68 g·L -1 ), lipid content (31.47%) and lipid productivities (47.21 ± 2.08 mg·L -1 ·day -1 ) in glycerol supplemented media were more than those got under autotrophic cultivation. Chlorophyll contents did not vary remarkably in heterotrophic cultures. The major fatty acids obtained by Gas Chromatography Mass Spectrometry (GC-MS) were oleic and Octadecanoic acids for all the culture conditions. Chlorella lewinii is appropriate for accumulating lipids for biodiesel under heterotrophic cultivation on glucose because of high lipid volumetric productivities.
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