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Title:
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Biorefinery of the green seaweed Ulva lactuca to produce animal feed, chemicals and biofuels
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Author(s):
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Bikker, P.; Krimpen, M.M. van; Wikselaar, P. van; Houweling-Tan, B.; Scaccia, N.; Hal, J.W. van; Huijgen, W.J.J.; Cone, J.W.; López-Contreras, A. M.
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Published by:
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Publication date:
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ECN
Biomass & Energy Efficiency
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30-4-2016
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ECN report number:
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Document type:
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ECN-W--15-008
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Article (scientific)
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Number of pages:
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18
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Published in: Journal of Applied Phycology (Springer), , 2016, Vol.23 april 2016, p.1-15.
Abstract:
DOI: 10.1007/s10811-016-0842-3; This article is published with open access at Springerlink.com
The growing world population demands an increase in animal protein production. Seaweed may be a valuable source of protein for animal feed. However, a biorefinery approach aimed at cascading valorisation of both protein and non-protein seaweed constituents is required to realise an economically feasible value chain. In this study, such a biorefinery approach is presented for the green seaweed Ulva lactuca containing 225 g protein (N×4.6) kg-1 dry matter (DM). The sugars in the biomass were solubilised by hot water treatment followed by enzymatic hydrolysis and centrifugation resulting in a sugar-rich hydrolysate (38.8 g L-1 sugars) containing glucose, rhamnose and xylose, and a protein-enriched (343 g kg-1 in DM) extracted fraction. This
extracted fraction was characterised for use in animal feed, as compared to U. lactuca biomass. Based on the content of essential amino acids and the in vitro N (85 %) and organic matter (90 %) digestibility, the extracted fraction seems a promising protein source in diets for monogastric animals with improved characteristics as compared to the intact U. lactuca. The gas production test indicated a moderate rumen fermentation of U. lactuca and the extracted fraction,
about similar to that of alfalfa. Reduction of the high content of minerals and trace elements may be required to allow a high inclusion level of U. lactuca products in animal diets. The hydrolysate was used successfully for the production of acetone, butanol, ethanol and 1,2-propanediol by clostridial fermentation, and the rhamnose fermentation pattern was studied.
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