Microbial production of biopolymers from the renewable resource wheat straw
Article first published online: 13 JUL 2014
© 2014 The Society for Applied Microbiology
Journal of Applied Microbiology
Volume 117, Issue 4, pages 1035–1044, October 2014
How to Cite
Gasser, E., Ballmann, P., Dröge, S., Bohn, J. and König, H. (2014), Microbial production of biopolymers from the renewable resource wheat straw. Journal of Applied Microbiology, 117: 1035–1044. doi: 10.1111/jam.12581
- Issue published online: 15 SEP 2014
- Article first published online: 13 JUL 2014
- Accepted manuscript online: 20 JUN 2014 01:14AM EST
- Manuscript Accepted: 16 JUN 2014
- Manuscript Revised: 6 JUN 2014
- Manuscript Received: 11 APR 2014
- “European Regional Development Fund”
- renewable resources;
- thermal pressure hydrolysis;
- wheat straw
Production of poly-ß-hydroxybutyrate (PHB) and the chemical basic compound lactate from the agricultural crop ‘wheat straw’ as a renewable carbon resource.
Methods and Results
A thermal pressure hydrolysis procedure for the breakdown of wheat straw was applied. By this means, the wheat straw was converted into a partially solubilized hemicellulosic fraction, consisting of sugar monomers, and an insoluble cellulosic fraction, containing cellulose, lignin and a small portion of hemicellulose. The insoluble cellulosic fraction was further hydrolysed by commercial enzymes in monomers. The production of PHB from the sugar monomers originating from hemicellulose or cellulose was achieved by the isolates Bacillus licheniformis IMW KHC 3 and Bacillus megaterium IMW KNaC 2. The basic chemical compound, lactate, a starting compound for the production of polylactide (PLA), was formed by some heterofermentative lactic acid bacteria (LAB) able to grow with xylose from the hemicellulosic wheat straw hydrolysate.
Two strains were selected which were able to produce PHB from the sugars both from the hemicellulosic and the cellulosic fraction of the wheat straw. In addition, some of the LAB tested were capable of producing lactate from the hemicellulosic hydrolysate.
Significance and Impact of the Study
The renewable resource wheat straw could serve as a substrate for microbiologically produced basic chemicals and biodegradable plastics.