Abstract
Sargassum horneri is inedible and invasive species of brown macroalgae that expands and drifts in Spring and Summer, causing damages to the ecosystem of the south coast of Korea, especially Jeju island. Korean government is preventively collecting large amounts of S. horneri biomass before reaching to the coast, but there is no other way to dispose or utilize the biomass but landfill and incineration. In the present study, S. honeri biomass was tested as a raw material for biological production of lactic acid, a type of commodity chemicals for polymer synthesis. Using commercial cellulases and lactic acid-producing engineered yeast, simultaneous saccharification and fermentation (SSF) conditions were optimized and lactic acid production was demonstrated. Finally, lactic acid was produced at a yield of 0.24 g lactic acid/g dried biomass and at a productivity of 0.73 g lactic acid/L-h, suggesting an industrial potential to biologically utilize S. honeri coastal waste.
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