Authors: Victor Ujor Chidozie Victor Agu Venkat Gopalan Thaddeus Chukwuemeka Ezeji
Publish Date: 2014/05/17
Volume: 98, Issue: 14, Pages: 6511-6521
Abstract
Lignocellulosederived microbial inhibitors such as furfural and 5hydroxymethyl furfural adversely affect fermentation of lignocellulosic biomass hydrolysates to fuels and chemicals due to their toxicity on fermenting microbes To harness the potential of lignocellulose as a cheap source of fermentable sugars in situ detoxification of furfural and other lignocellulosederived microbial inhibitors is essential To enhance in situ detoxification and tolerance of furfural by Clostridium beijerinckii NCIMB 8052 during acetonebutanolethanol ABE fermentation the effect of glycerol on NADH/NADPH generation and ABE production by furfural 4 5 and 6 g/Lchallenged cultures was investigated in this study In all instances beneficial outcomes were observed For example the fermentation medium supplemented with glycerol and subjected to 5 g/L furfural elicited up to 18 and 3fold increases respectively in NADH and NADPH levels in C beijerinckii 8052 relative to the control culture These critical changes are the likely underpinnings for the glycerolmediated 23fold increase in the rate of detoxification of 5 g/L furfural substrate consumption and ABE production compared to the unsupplemented medium Collectively these results demonstrate that increased intracellular NADH/NADPH in C beijerinckii 8052 due to glycerol utilization engenders favorable effects on many aspects of cellular metabolism including enhanced furfural reduction and increased ABE productionSalaries and research support were provided in part by State of Ohio funds appropriated to the Ohio Plant Biotechnology Consortium by The Ohio State University Ohio Agricultural Research and Development Center OARDC Western Region Sungrant Prime award No 20103850221839 and the Hatch grant Project No OHO01222
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