Journal
BIOTECHNOLOGY AND BIOENGINEERING
Volume 115, Issue 6, Pages 1624-1629Publisher
WILEY
DOI: 10.1002/bit.26578
Keywords
biorefinery; Caldicellulosiruptor; CO2 fixation; Cupriavidus necator; fermentation; lignocellulose
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Funding
- National Science Foundation of China [21676279]
- National High-Tech Research and Development Program of China [2014AA021905]
- US National Science Foundation [CBET-1264052]
- Key Research and Development Projects of Hainan Province, China [ZDYF2016205]
- Chinese Academy of Sciences Strategic Biological Resources Service Network [ZSYS-015]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1264052] Funding Source: National Science Foundation
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Unpretreated rice straw was fermented by the extremely thermophilic bacterium Caldicellulosiruptor kronotskyensis, generating solubilized carbohydrates, organic acids, lignin-derived aromatics, H-2, and CO2, which were subsequently used to produce polyhydroxybutyrate (PHB) by the chemolithoautotrophic bacterium Cupriavidus necator. The fermented liquid significantly enhanced the growth of C. necator, leading to a five-fold cell biomass yield, and a nine-fold PHB yield compared to what was obtained from conventional mineral media. This integrated process utilized all products of lignocellulose fermentation without H (electron) loss and carbon emission, while concomitantly enhancing CO2 fixation by C. necator for PHB production. The sequential coupling of C. kronotskyensis and C. necator provides not only a new biorefinery paradigm characterized by reduced pretreatment and saccharification requirements but also an efficient way for enhancing CO2 fixation.
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