[ad#PhycoBiosciences AIM Interview]

Research

Brown algae being engineered for food and bio-ethanol

December 2, 2013
AlgaeIndustryMagazine.com

New research shows that all major sugars in brown macroalgae can be used as feedstocks. Photo: David Csepp, NOAA/NMFS/AKFSC/Auke Bay Lab

New research shows that all major sugars in brown macroalgae can be used as feedstocks. Photo: David Csepp, NOAA/NMFS/AKFSC/Auke Bay Lab

European Biotechnology News reports that researchers, together with Norwegian and Chilean bioethanol producers, have developed advanced techniques to produce food and bio-ethanol from brown algae, which does not require arable land, fresh water or fertilizers.

Until now, cultivation of that feedstock was not sustainable, because yeasts weren’t able to transform the brown algae’s alginate and mannitol to bio-ethanol. Now the team, under Yasuo Yoshikuni from Bio Architecture Lab Inc. (Berkeley, USA) and the biofuel firms BALChile SA (Santiago de Chile) and Statoil ASA (Trondheim, Norway), have presented a metabolically-engineered yeast strain that can achieve that.

After re-engineering the alginate and mannitol catabolic pathways in the standard industrial microbe Saccharomyces cerevisiae, researchers also integrated the alginate monomer (4-deoxy-L-erythro-5-hexoseulose uronate, or DEHU) transporter from the alginolytic eukaryote Asteromyces cruciatus into the yeast genome.

Overexpression of the transporter gene together with the required bacterial alginate and deregulated native mannitol catabolism genes, enabled S. cerevisiae to efficiently metabolise DEHU and mannitol.

When this platform was further adapted to grow on mannitol and DEHU under anaerobic conditions, it was capable of ethanol fermentation from mannitol and DEHU, achieving titres of 4.6%(v/v) (36.2 g l21) and yields up to 83% of the maximum theoretical yield from consumed sugars.

According to the researchers, these results show that all major sugars in brown macroalgae can be used as feedstocks for biofuels and value-added renewable chemicals in a manner that is comparable to traditional arable-land-based feedstocks.

The research is reported in Nature

Read More

More Like This…

HOME Algae Industry Jobs

Copyright ©2010-2013 AlgaeIndustryMagazine.com. All rights reserved. Permission granted to reprint this article in its entirety. Must include copyright statement and live hyperlinks. Contact editorial@algaeindustrymagazine.com. A.I.M. accepts unsolicited manuscripts for consideration, and takes no responsibility for the validity of claims made in submitted editorial.

From The A.I.M. Archives

— Refresh Page for More Choices
Stavanger, Norway-based Skretting, a 100+ year-old leader in the manufacture and supply of aquaculture feeds for fish and shrimp, has announced that they are now offering...
Jason Smith reports for undercurrentnews that Kentucky-based Alltech is willing to invest in overseas algae production plants closer to its feed customers if demand for i...
Tom Lindfors writes in the New Richmond News about how the Roberts, Wisconsin, wastewater treatment plant – considered a minor utility designed to treat an average flow o...
Global Algae Innovations, with headquarters in San Diego, California, and cultivation/production facilities in Lihue, Hawaii, have introduced a new algae harvesting syste...
Algae Health Sciences, Inc., a subsidiary of BGG, has announced that it has submitted a New Dietary Ingredient (NDI) to the US FDA for its flagship product AstaZine® Natu...
Nicolas Sainte-Foie writes for Labiotech.eu about French startup Algopack manufacturing bio-based plastics made from brown algae. Founded by Rémy Lucas in 2010 and manage...