Extracellular Electron Transfer Enhances Polyhydroxybutyrate Productivity in Ralstonia eutropha

Koichi Nishio, Yuki Kimoto, Jieun Song, Tomohiro Konno, Kazuhiko Ishihara, Souichiro Kato, Kazuhito Hashimoto, Shuji Nakanishi

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


Polyhydroxyalkanoate is a biodegradable and biocompatible polymer that is synthesized in intracellular granules by a wide variety of microorganisms under growth-suppressed conditions. Herein, we report that polyhydroxybutyrate (PHB) productivity in Ralstonia eutropha was accelerated by extracellular electron transfer (EET) using a biocompatible mediator in an electrochemical system. When the electrode potential was poised at 0.6 V (vs the standard hydrogen electrode) where the EET pathway was constructed, the PHB production rate was enhanced by 60% compared to the case without the EET process. The results indicate that the extracellular anode served as an additional electron acceptor for microbial metabolism, resulting in acceleration of glycolysis and hence PHB synthesis.

Original languageEnglish
Pages (from-to)40-43
Number of pages4
JournalEnvironmental Science and Technology Letters
Issue number1
Publication statusPublished - 2013 Nov 11
Externally publishedYes

ASJC Scopus subject areas

  • Environmental Chemistry
  • Ecology
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis


Dive into the research topics of 'Extracellular Electron Transfer Enhances Polyhydroxybutyrate Productivity in Ralstonia eutropha'. Together they form a unique fingerprint.

Cite this