Journal
JOURNAL OF BASIC MICROBIOLOGY
Volume 53, Issue 5, Pages 440-450Publisher
WILEY
DOI: 10.1002/jobm.201200001
Keywords
Chlorella sp; Glucose; Heterotrophy; Microalgae; Mixotrophy; Photoautotrophy
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Funding
- Division of Microbiology, Indian Agricultural Research Institute (IARI), New Delhi
- Indian Council of Agricultural Research
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The objective of this study was to identify the most promising nutritional mode of growth for enhanced biomass and lipid productivity in a set of twenty microalgal strains, grown under photoautotrophic and mixotrophic/heterotrophic conditions using 2% glucose as carbon source. These included four cyanobacterial strains (Cyanosarcina, Phormidium, Nostoc and Anabaena) and sixteen green algae belonging to six genera (five strains each of Chlorella and Chlorococcum, two of Scenedesmus and one each of Chlamydomonas, Kirchneria, Bracteacoccus and Ulothrix). Lipid productivity ranged from 213% under photoautotrophic conditions, 1.732% under mixotrophic conditions and 0.920% under heterotrophic conditions. MIC-G5 Chlorella sp. followed by MIC-G11 Chlorella sp. exhibited the highest cellular lipid content (355 and 271g/ml) and lipid productivity of 32% and 28% respectively in mixotrophic condition. In the glucose supplemented conditions (heterotrophic), a significant reduction in PUFA from 25.1 to 9.4, 29.2 to 12.4 and 44.7 to 10.2 was observed in MIC-G4, MIC-G5 and MIC-G11, respectively. A remarkable enhancement of 3370% in SFA was recorded under mixotrophic conditions. As the quality of biodiesel is based on high SFA and low PUFA, our results illustrate the significance of glucose supplemented condition as a promising strategy for generating high value biodiesel from algae.
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