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Rice straw fermentation using lactic acid bacteria.

Lijuan Gao1, Hongyan Yang, Xiaofen Wang

  • 1College of Agronomy and Biotechnology, China Agricultural University Beijing 100094, PR China.

Bioresource Technology
|August 19, 2007
PubMed
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A novel lactic acid bacteria community, SFC-2, effectively ferments rice straw, reducing environmental disposal issues. This process lowers pH and boosts lactic acid production, utilizing key Lactobacillus species.

Area of Science:

  • Agricultural Microbiology
  • Biotechnology
  • Environmental Science

Background:

  • Rice straw presents a significant environmental disposal challenge.
  • Efficient utilization of agricultural waste is crucial for sustainable practices.
  • Lactic acid fermentation offers a potential bioconversion pathway for lignocellulosic biomass.

Purpose of the Study:

  • To develop a lactic acid bacteria (LAB) community for efficient rice straw fermentation.
  • To characterize the microbial composition of the developed LAB community.
  • To evaluate the impact of LAB fermentation on rice straw properties.

Main Methods:

  • Development of a LAB community (SFC-2) through enrichment culture using rice straw and MRS-S broth.
  • Identification of bacterial species using plate isolation, denaturing gradient gel electrophoresis (DGGE), and 16S rDNA sequencing.

Related Experiment Videos

  • Assessment of fermentation efficacy by measuring pH and lactic acid concentration in rice straw.

    • Main Results:

    • The SFC-2 community rapidly decreased broth pH and produced high lactic acid levels.
    • Microbial analysis identified Lactobacillus species, primarily L. fermentum, L. plantarum, and L. paracacei, within SFC-2.
    • Fermentation with SFC-2 significantly lowered rice straw pH and markedly increased lactic acid concentration.

    Conclusions:

    • The SFC-2 LAB community effectively accelerates rice straw fermentation.
    • L. plantarum, L. fermentum, and L. paracacei are key species driving this fermentation process.
    • This approach offers a viable strategy for valorizing rice straw and mitigating environmental concerns.