Journal
BIORESOURCE TECHNOLOGY
Volume 203, Issue -, Pages 204-210Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.12.043
Keywords
Steam explosion sterilization; Solid-state fermentation; Microstructure; Solid medium; Low-field nuclear magnetic resonance (LF-NMR)
Funding
- National High Technology Research and Development Program (863 Program) [2012AA021302]
- Open Funding Project of the State Key Laboratory of Biochemical Engineering [2013KF-01]
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Physical structure changes of solid medium were investigated to reveal effects of steam explosion sterilization on solid-state fermentation (SSF). Results indicated that steam explosion changed the structure of solid medium at both molecular and three-dimensional structural levels, which exposed hydrophilic groups and enlarged pores and cavities. It was interesting to find that pores where capillary water located were the active sites for SSF, due to the close relationship among capillary water relaxation time, specific surface area and fermentation performance. Therefore, steam explosion sterilization increased the effective contact area for microbial cells on solid medium, which contributed to improving SSF performance. Combined with the previous research, mechanisms of SSF improvement by steam explosion sterilization contained both chemical and physical effects. (C) 2015 Elsevier Ltd. All rights reserved.
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