Oil Accumulation via Heterotrophic/Mixotrophic <Emphasis Type="Italic">Chlorella protothecoides</Emphasis> |
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Authors: | Tamarys Heredia-Arroyo Wei Wei Bo Hu |
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Institution: | 1.Department of Chemical Engineering,University of Puerto Rico at Mayagüez,Mayagüez,Puerto Rico;2.Department of Mathematical Sciences,University of Puerto Rico at Mayagüez,Mayagüez,Puerto Rico;3.Department of Bioproducts and Biosystems Engineering,University of Minnesota at Twin Cities,Saint Paul,USA |
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Abstract: | Microalgal oil is a potential energy source because it can be easily converted to fatty acid methyl ester or hydrocarbon type
of diesel, and it is produced with relatively higher productivity compared with oil from plants and animals. Heterotrophic
growth of microalgae is superior due to its high final product concentration; however, the cost of the raw materials is unacceptable
if sugar is utilized as the carbon source. The aim of this study is to optimize the lipid accumulation of Chlorella protothecoides by using carbon sources other than glucose in heterotrophic and mixotrophic cultures. Different factors such as different
carbon sources, carbon to nitrogen ratio, initial pH level, salinity, and rotational speed are studied in affecting the cell
growth and the oil accumulation. Our experiments revealed that the heterotrophic and mixotrophic cultures of C. protothecoides grew better than autotrophic cultures. C. protothecoides can grow on glycerol or acetate, as well as on glucose. Several stress factors were confirmed or discovered to significantly
increase the lipid content of microalgae cells. The replacement of glycerol and acetate as carbon sources for microalgae cultivations
provides potential for waste utilization: glycerol from biodiesel industry and acetate from biohydrogen production. |
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