Abstract
Two lignocellulosic agricultural residues, sunflower stalks and rape straw, were investigated as potential low-cost, non-food substrates for the production of triacylglycerols by the oleaginous, lignocellulolytic bacteria Streptomyces lividans . Chemical analysis of each type of residue revealed similar cell wall compositions in the polysaccharides and lignins of the two feedstocks, with high lignin β -O-4 bond content compared to other angiosperms’ lignin. Growing tests of Streptomyces lividans TK 24 were performed before and after sequential water and ethanol extraction by assessing bacterial fatty acid accumulation. All extracted and non-extracted samples were found to be substrates of the bacteria with fatty acid production ranging between 19% and 44% of the production obtained with arabinose as a reference substrate. The maximum conversion rate was obtained with the less lignified, non-extracted sample. This study suggests that lignocellulosic residues from oleaginous crops could be advantageously valorized by microbial bioconversion processes for the production of lipids of interest.
Highlights
Lipid-based chemicals and biofuels are of great interest in the current context of petroleum resource rarefaction
The lignocellulose of the secondary, lignified plant cell wall is composed of an interpenetrated assembly of three polymers: cellulose, hemicelluloses, and lignin
The objective of this study was to assess the possibility of converting lignocellulose into lipids of interest for industrial use with microorganisms known for their wood-degrading activity and constituent lignin-degrading enzymes
Summary
Lipid-based chemicals and biofuels are of great interest in the current context of petroleum resource rarefaction. Because of the competition with food usage, the use of these lipid sources is ques-. Lignocellulose constitutes the main part of plant biomass and is available either as a byproduct of the agriculture and food industries (brans and stems) or as dedicated biomass feedstocks (wood and fiber crops). It represents an important, renewable carbon pool for the production of bioenergy (Somerville et al, 2010) and biomolecules of interest, in particular by bacterial bioconversion (Mathews et al, 2015). While cellulose and hemicelluloses are converted into sugars by enzymes, the presence of lignin, a hydrophobic phenolic polymer, is responsible for lignocellulose’s overall recalcitrance to the enzymatic deconstruction processes (Zhao et al, 2012)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
