Biotechnology and Bioprocess Engineering

, Volume 17, Issue 2, pp 290–297 | Cite as

Fundamental analysis of real-time PCR quantification and modeling for thermophilic L-lactate fermentation by Bacillus coagulans from glucose

  • Taira HidakaEmail author
  • Hiroshi Tsuno
  • Haruka Yagi
  • Yusuke Kosaka
Research Paper


Batch and semi-continuous thermophilic l-lactate fermentation experiments were performed using Bacillus coagulans and glucose as a substrate. Reactor performance and biomass concentrations were assessed using two methods: turbidity as a traditional biomass index and real-time polymerase chain reaction (PCR) quantification of 16S rRNA genes. In the batch experiment, although the relationship between turbidity and real-time PCR assay differed depending on the growth phase, a correlation was observed between both assay methods. In the semi-continuous experiment, real-time PCR measurement was well suited for use as an index for evaluating bacterial mass under different organic loading conditions. A mathematical model was applied to evaluate the real-time PCR quantification to long-term, semi-continuous lactate fermentation. Lactate fermentation was well suited since only B. coagulans was involved in the reactions. The results obtained revealed a fundamental relationship between real-time PCR and traditional biomass analyses.


real-time PCR Bacillus coagulans lactate fermentation turbidity inhibition glucose 


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Copyright information

© The Korean Society for Biotechnology and Bioengineering and Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Taira Hidaka
    • 1
    Email author
  • Hiroshi Tsuno
    • 1
  • Haruka Yagi
    • 1
  • Yusuke Kosaka
    • 1
  1. 1.Department of Environmental EngineeringKyoto UniversityKyotoJapan

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