Thursday, November 20, 2014

Bio Architecture Lab Engineered an Enzyme to Degrade Seaweed Sugars

"Bio Architecture Lab (BAL) has partnered with global aquaculture, chemical and petroleum industries to unlock the potential for sustainable fuels, chemicals and other products. BAL will work collaboratively with other industrial and specialty manufacturers to integrate their technology, or create new technology, designed to help make end products more sustainable and cost effective."
One of the biggest criticisms leveled at biofuels that are derived from crops such as wheat, corn and sugar cane, is that they result in valuable land being taken away from food production. For this reason there are various research efforts underway to turn seaweed into a viable renewable source of biomass. Now a team from BAL claims to have developed a breakthrough technology that makes seaweed a cost-effective source of biomass by engineering a microbe that can extract all the major sugars in seaweed and convert them into renewable fuels and chemicals.

Because of its high sugar content, the fact it doesn't require arable land or freshwater to grow, and is environmentally friendly, seaweed is seen as an ideal global feedstock for the commercial production of biofuels and renewable chemicals. According to BAL, less than three percent of the coastal waters globally is all that's required to produce enough seaweed capable of replacing over 60 billion gallons (227 billion liters) of fossil fuel annually.

The BAL team's breakthrough, which could help make this underutilized resource much more economically attractive, centers around an enzyme that is able to unlock and metabolize the polysaccharides within the seaweed.

"About 60 percent of the dry biomass of seaweed are fermentable carbohydrates, and approximately half of those are locked in a single carbohydrate - alginate," said Daniel Trunfio, Chief Executive Officer at Bio Architecture Lab. "Our scientists have engineered an enzyme to degrade and a pathway to metabolize the alginate, allowing us to utilize all the major sugars in seaweed, which therefore makes the biomass an economical feedstock for the production of renewable fuels and chemicals."

BAL was a co-recipient of an award for the development of a process to convert sugars from seaweed into isobutanol from the U.S. Department of Energy's new Advanced Research Projects Agency - Energy (ARPA-E).

"BAL's technology to ferment a seaweed feedstock to renewable fuels and chemicals has suggested an entirely new pathway for biofuels development, one that is no longer constrained to terrestrial sources," says ARPA-E Program Director Dr. Jonathan Burbaum. "When fully developed and deployed, large scale seaweed cultivation combined with BAL's technology promises to produce renewable fuels and chemicals without forcing a tradeoff with conventional food crops such as corn or sugarcane."

The BAL team's breakthrough is detailed in an article entitled "An Engineered Microbial Platform for Direct Biofuel Production from Brown Macroalgae", which appears in the January 20, 2012 issue of Science.

Closely held Bio Architecture, based in Berkeley, California, started operating in Chile in 2009 with an eye to turning parts of the country’s 6,400-kilometer (4,000-mile) coastline into farms for biofuel, he said. The company will continue researching algae-to-ethanol technologies so that it’s positioned if feedstock prices fall enough to make the business model viable.

“Seaweed is worth $1.30 a kilogram without doing anything to it, so why would you harvest it and produce ethanol” which cost 75 cents a kilogram, Lucien said. “The opportunity cost is too great.”

Lucien declined to comment on how much the company spent on the effort and on the future of a partnership it has with oil company Statoil ASA (STL) to produce ethanol from algae off the coast of Norway. The Chilean project includes applications for permits to 4,800 hectares of so-called aquafarms, he said.

Seaweed has been farmed since the fourth century in Japan and is now processed into food products valued at as much as $5 billion a year, according to the United Nation’s Food and Agriculture Organization’s website.

More information:
» Biofuels Digest: Bio Architecture Lab Changes CEO and Strategy
» Science Daily: University of Michigan Lab Uses Fungus and Engineered E. coli

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