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A novel steam explosion sterilization improving solid-state fermentation performance.

Zhi-Min Zhao1, Lan Wang2, Hong-Zhang Chen2

  • 1State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.

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|June 21, 2015
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Summary
This summary is machine-generated.

High-temperature, short-time steam explosion (SE) offers a faster and more effective method for sterilizing solid media (SM). This novel approach enhances nutrient content and significantly boosts fermentation productivity compared to traditional methods.

Keywords:
Image processingNutritionSolid mediumSteam explosionSterilization

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Area of Science:

  • Biotechnology
  • Microbiology
  • Chemical Engineering

Background:

  • Traditional sterilization of solid media (SM) is time-consuming, nutrient-degrading, and often inadequate due to low thermal conductivity.
  • Liquid media sterilization is generally more efficient than solid media sterilization.

Purpose of the Study:

  • To investigate a novel high-temperature and short-time steam explosion (SE) strategy for SM sterilization.
  • To evaluate the impact of SE on SM nutrient content, inhibitor formation, and fermentability.

Main Methods:

  • Utilized high-temperature and short-time steam explosion (SE) for SM sterilization.
  • Determined optimal SE conditions for complete sterilization (172 °C for 2 min and 128 °C for 5 min).
  • Analyzed glucose, xylose, and fermentation inhibitor content using FTIR spectroscopy.

Main Results:

  • SE achieved complete sterilization under mild conditions, significantly increasing glucose (157%) and xylose (93%) content compared to conventional sterilization.
  • No fermentation inhibitors were detected after SE sterilization.
  • Fourier-transform infrared spectroscopy (FTIR) indicated SE released monosaccharides from polysaccharides.
  • Bacillus subtilis fermentation productivity was 3.83 times higher on SE-sterilized SM.

Conclusions:

  • SE is a rapid and effective sterilization method for SM, improving nutrient availability.
  • The enhanced nutrient profile of SE-sterilized SM significantly boosts fermentation productivity.
  • SE technology holds promise for improving the economics of solid-state fermentation.