WASHINGTON鈥擡nergy experts believe that seaweed holds enormous potential as a biofuel alternative to coal and oil, and US-based scientists say they have unlocked the secret of turning its sugar into energy.
A newly engineered microbe can do the work by metabolizing all of the major sugars in brown seaweed, potentially making it a cost-competitive alternative to petroleum fuel, said the report in the US journal Science.
The team at the Berkeley, California-based Bio Architecture Lab engineered a form of E. coli bacteria that can digest the seaweed鈥檚 sugars into ethanol, it said.
Unlike other microbes before, researchers found it can attack the primary sugar constituent in seaweed, known as alginate.
鈥淥ur scientists have engineered an enzyme to degrade and a pathway to metabolize the alginate, allowing us to utilize all the major sugars in seaweed, said Daniel Trunfio, chief executive at Bio Architecture Lab.
The advance 鈥渕akes the biomass an economical feedstock for the production of renewable fuels and chemicals,鈥� he said.
A company spokesman told AFP that the lab currently has four aquafarming sites in Chile where it hopes to 鈥渟cale up its microbe technology as the next step on the path to commercialization鈥� in the next three years.
Seaweed is seen as an appealing option for biofuel because, unlike corn and sugar cane, it does not use arable land and so does not compete with crops grown for food.
Less than three percent of the world鈥檚 coastal waters can produce enough seaweed to replace some 60 billion gallons of fossil fuel, according to background information in the article.
At peak production, seaweed could produce 19,000 liters per hectare annually, about twice the level of ethanol productivity from sugarcane and five times higher than the ethanol productivity from corn.
Funding for the research came from the US Department of Energy鈥檚 Advanced Research Projects Agency, a grant from InnovaChile, and Norwegian oil giant Statoil.