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  • Title: High-productivity lipid production using mixed trophic state cultivation of Auxenochlorella (Chlorella) protothecoides.
    Author: Rismani-Yazdi H, Hampel KH, Lane CD, Kessler BA, White NM, Moats KM, Thomas Allnutt FC.
    Journal: Bioprocess Biosyst Eng; 2015 Apr; 38(4):639-50. PubMed ID: 25326061.
    Abstract:
    A mixed trophic state production process for algal lipids for use as feedstock for renewable biofuel production was developed and deployed at subpilot scale using a green microalga, Auxenochlorella (Chlorella) protothecoides. The process is composed of two separate stages: (1) the photoautotrophic stage, focused on biomass production in open ponds, and (2) the heterotrophic stage focused on lipid production and accumulation in aerobic bioreactors using fixed carbon substrates (e.g., sugar). The process achieved biomass and lipid productivities of 0.5 and 0.27 g/L/h that were, respectively, over 250 and 670 times higher than those obtained from the photoautotrophic cultivation stage. The biomass oil content (over 60% w/DCW) following the two-stage process was predominantly monounsaturated fatty acids (~82%) and largely free of contaminating pigments that is more suitable for biodiesel production than photosynthetically generated lipid. Similar process performances were obtained using cassava hydrolysate as an alternative feedstock to glucose.
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