Abstract
Recently, H. pluvialis has been demonstrated to have significant potential for biofuel production. To explore the correlation between total lipid content and other physiological parameters under s tress conditions, the responses of H. pluvialis to high light intensity (HL), nitrogen deprivation (-N), and high light intensity with nitrogen deprivation (HL-N) were investigated. The total lipid content in the control cells was 12.01% dw, whereas that of the cells exposed to HL, -N, and HL-N conditions was 56.92, 46.71, and 46.87% dw, respectively. The fatty acid profile was similar under all conditions, with the main components including palmitic acid, linoleic acid, and linolenic acid. A good correlation was found between individual carotenoid and total lipids, regardless of culture conditions. P hotosynthetic parameters and lipid content were also found to be well-correlated.
Highlights
Energy has become a crucial factor for humans’ economic growth and high standard of living, especially after the industrial revolution in the late eighteenth and early nineteenth centuries (Atabani et al, 2012)
The cells exposed to the control culture retained their flagella for longer periods compared to that under stress conditions
We found that polyunsaturated fatty acid (PUFA) 16:2, 16:4 and EPA decreased when H. pluvialis cells were cultivated under stress conditions
Summary
Energy has become a crucial factor for humans’ economic growth and high standard of living, especially after the industrial revolution in the late eighteenth and early nineteenth centuries (Atabani et al, 2012). Algae species and culture conditions have been found to be the two most important factors contributing to high oil yield (Ghasemi et al, 2012; Xu et al, 2013; Mou et al, 2012). It has been reported that the oil content of Botryococcus braunii can reach 75% dw under nitrogen-deficient condition; the alga has been found to exhibit low productivity (Ghasemi et al, 2012). It was observed that nitrogen is quantitatively the most important nutrient affecting the biomass growth and lipid productivity of various microalgae (Griffiths and Harrison, 2009). The lipid production of the most common algae ranged between 20 and 50%, and high light intensity has been observed to stimulate higher productivities (Mata et al, 2010)
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