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Butanol fermentation of the brown seaweed Laminaria digitata by Clostridium beijerinckii DSM-6422

Hou, Xiaoru, From, Nikolaj, Angelidaki, Irini, Huijgen, Wouter J.J., Bjerre, Anne-Belinda
Bioresource technology 2017 v.238 pp. 16-21
Clostridium beijerinckii, Laminaria, alginates, biomass, butanol, coasts, cost effectiveness, fermentation, fuel production, hydrolysates, macroalgae, sugars, North Sea
Seaweed represents an abundant, renewable, and fast-growing biomass resource for 3rd generation biofuel production. This study reports an efficient butanol fermentation process carried out by Clostridium beijerinckii DSM-6422 using enzymatic hydrolysate of the sugar-rich brown seaweed Laminaria digitata harvested from the coast of the Danish North Sea as substrate. The highest butanol yield (0.42g/g-consumed-substrates) compared to literature was achieved, with a significantly higher butanol:acetone-butanol-ethanol (ABE) molar ratio (0.85) than typical (0.6). This demonstrates the possibility of using the seaweed L. digitata as a potential biomass for butanol production. For the first time, consumption of alginate components was observed by C. beijerinckii DSM-6422. The efficient utilization of sugars and lactic acid further highlighted the potential of using this strain for future development of large-scale cost-effective butanol production based on (ensiled) seaweed.