(460b) Growth and Lipid Production of a Microalga Capable of Phagotrophic, Heterotrophic and Phototrophic Metabolisms

With fast growth rates and potentially high lipid yields, microalgal culture has been considered as one of the most promising approaches to feedstock production for renewable biofuel, bio-based surfactants, and other products.  We identified a microalga capable of phagotrophic, heterotrophic and phototrophic metabolisms and accumulation of high intracellular lipid contents.  In this study, the effects of pH, dissolved oxygen concentration, and shear associated with mechanical agitation on algal growth were examined to establish the optimal growth conditions. The effects of different carbon sources (glucose, acetic acid, bacteria cells, and waste ketchup) on algal growth and lipid productivity were also studied. The results show that the microalga could grow effectively on various carbon sources and the lipid content could reach as high as 80% of their dry weight.  The potential of culturing this microalga for lipid production was clearly demonstrated.