Journal
BIORESOURCE TECHNOLOGY
Volume 105, Issue -, Pages 120-127Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.11.103
Keywords
Chlorella vulgaris; Lipid productivity; Microalgal lipid; Medium composition; Cultivation condition
Funding
- Taiwan's National Science Council [NSC 100-3113-E-006-016-, NSC 99-3113-P-110-001-]
- National Cheng Kung University
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The growth and lipid productivity of an isolated microalga Chlorella vulgaris ESP-31 were investigated under different media and cultivation conditions, including phototrophic growth (NaHCO3 or CO2, with light), heterotrophic growth (glucose, without light), photoheterotrophic growth (glucose, with light) and mixotrophic growth (glucose and CO2, with light). C. vulgaris ESP-31 preferred to grow under phototrophic (CO2), photoheterotrophic and mixotrophic conditions on nitrogen-rich medium (i.e.. Basal medium and Modified Bristol's medium), reaching a biomass concentration of 2-5 g/l. The growth on nitrogen-limiting MBL medium resulted in higher lipid accumulation (20-53%) but slower growth rate. Higher lipid content (40-53%) and higher lipid productivity (67-144 mg/l/d) were obtained under mixotrophic cultivation with all the culture media used. The fatty acid composition of the microalgal lipid comprises over 60-68% of saturated fatty acids (i.e., palmitic acid (C16:0), stearic acid (C18:0)) and monounsaturated acids (i.e., oleic acid (C18:1)). This lipid composition is suitable for biodiesel production. (C) 2011 Elsevier Ltd. All rights reserved.
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