Abstract
This study evaluated variations in Neochloris oleoabundans' growth rate and biochemical characteristics (fatty acid methyl ester (FAME) profile and lipid granule properties) in response to light-emitting diodes (LEDs) at a range of spatially-averaged light intensities (LISA) in either the red or white spectra. The red-light spectra (630–700 nm) yielded the greatest proportions of total lipids (25.2 ± 0.2 wt%) as well as monounsaturated fatty acids (MUFAs) such as C16:1 and C18:1, producing a high-quality FAMEs profile for biodiesel production. Using white and red spectra, the half-maximum-rate light irradiance (KL) was 35 and 37 μE m−2 s−1 and the half-inhibition-rate light irradiance (KI) was 299 and 502 μE m−2 s−1, respectively. The greater red-light KI value suggests that N. oleoabundans is less sensitive to photoinhibition by light of that spectra. Transmission electron microscope (TEM) images also showed enlarged lipid bodies in algal cells grown under high light intensities in the red spectra, a clear advantage for lipid production. These results demonstrate that control over light wavelength is a powerful tool for the production of high-quality fatty acids in microalgae could be a viable and sustainable medium for algae cultivation.
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