Title: Conversion of corn stover alkaline pre-treatment waste streams into biodiesel via Rhodococci

Journal Article · · RSC Advances
DOI: https://doi.org/10.1039/c6ra28033a · OSTI ID:1356963
 [1];  [1];  [1];  [1];  [2];  [3];  [4];  [5];  [6]
  1. Univ. of Tennessee, Knoxville, TN (United States). Department of Chemical & Biomolecular Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Bioscience Division
  2. Michigan State Univ., East Lansing, MI (United States). Department of Chemical Engineering & Materials Science and Great Lakes Bioenergy Research Center
  3. Michigan State Univ., East Lansing, MI (United States). Great Lakes Bioenergy Research Center and Department of Biochemistry
  4. Michigan State Univ., East Lansing, MI (United States). Department of Chemical Engineering & Materials Science, Great Lakes Bioenergy Research Center and Department of Biosystems & Agricultural Engineering
  5. Texas A & M Univ., College Station, TX (United States). Synthetic and Systems Biology Innovation Hub, Department of Plant Pathology and Microbiology
  6. Univ. of Tennessee, Knoxville, TN (United States). Department of Chemical & Biomolecular Engineering and Department of Forestry, Wildlife, and Fisheries, Center for Renewable Carbon; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Bioscience Division

We present the bioconversion of second-generation cellulosic ethanol waste streams into biodiesel via oleaginous bacteria is a novel optimization strategy for biorefineries with substantial potential for rapid development. In this study, one- and two-stage alkali/alkali-peroxide pretreatment waste streams of corn stover were separately implemented as feedstocks in 96 h batch reactor fermentations with wild-type Rhodococcus opacus PD 630, R. opacus DSM 1069, and R. jostii DSM 44719T . Here we show using 31P-NMR, HPAECPAD, and SEC analyses, that the more rigorous and chemically-efficient two-stage chemical pretreatment effluent provided higher concentrations of solubilized glucose and lower molecular weight (70 300 g mol1 ) lignin degradation products thereby enabling improved cellular density, viability, and oleaginicity in each respective strain. The most significant yields were by R. opacus PD 630, which converted 6.2% of organic content with a maximal total lipid production of 1.3 g L1 and accumulated 42.1% in oils based on cell dry weight after 48 h.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Joint Institute for Biological Sciences (JIBS); Texas A&M AgriLife Research, College Station, TX (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Bioenergy Technologies Office (BETO); USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725; EE0006112; EE0007104
OSTI ID:
1356963
Journal Information:
RSC Advances, Journal Name: RSC Advances Journal Issue: 7 Vol. 7; ISSN 2046-2069; ISSN RSCACL
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (10)

Biotransformation of lignin: Mechanisms, applications and future work journal October 2019
Synergistic maximization of the carbohydrate output and lignin processability by combinatorial pretreatment journal January 2017
Integrated diesel production from lignocellulosic sugars via oleaginous yeast journal January 2018
Combinatorial pretreatment and fermentation optimization enabled a record yield on lignin bioconversion journal January 2018
RETRACTED ARTICLE: Bacterial conversion of depolymerized Kraft lignin journal September 2018
Lipid metabolism of phenol-tolerant Rhodococcus opacus strains for lignin bioconversion journal December 2018
Recent advances in lignin valorization with bacterial cultures: microorganisms, metabolic pathways, and bio-products journal February 2019
Bacterial conversion of depolymerized Kraft lignin journal March 2019
Development of Rhodococcus opacus as a chassis for lignin valorization and bioproduction of high-value compounds journal August 2019
Utilization of simultaneous saccharification and fermentation residues as feedstock for lipid accumulation in Rhodococcus opacus journal September 2017