抄録
With the increasing focus on carbon neutrality, the development of biorefinery technologies has garnered considerable attention. Macroalgae offer potential advantages as biorefinery feedstocks over terrestrial plants and microalgae that have been studied to date, due to their lack of recalcitrant lignin and potentially lower cultivation costs. Sargassum muticum discovered in Fukuoka City, Fukuoka Prefecture, exhibited a maximum average thallus length of 397 cm, exceeding previously reported values, with a maximum individual length of 536 cm observed. The growth density was also higher than previously reported, with an average of 123 ind./m2 and a maximum of 166 ind./m2. Based on thallus length and growth density data obtained from the natural environment, a carbon dioxide fixation capacity of 25,382.8 g/m2 under high-density cultivation was estimated. Component analysis revealed a carbohydrate content of 50.4 %, with an estimated potential ethanol production of 5,146 g/m2. These results indicate the promising potential of S. muticum as a feedstock for macroalgal biorefinery.