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Gas-Phase Integration of Trophically Distinct Microbial Cultures for Net-Reduced CO2 and Enhanced Metabolite
Jaeyoung Yu1, Danbee Kim2,3, Jiye Lee2
1Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, Tokyo, Japan.
Microbial Biotechnology
|December 20, 2025
Summary
This study introduces a gas-linked co-culture system for sustainable biomanufacturing. It enhances carbon fixation and metabolite production by linking heterotrophic and autotrophic processes, reducing CO2 emissions.
Area of Science:
- Biotechnology and Biomanufacturing
- Environmental Science and Engineering
- Microbiology
Background:
- Rising atmospheric carbon dioxide (CO2) drives demand for sustainable carbon capture and utilization (CCU) biotechnologies.
- Autotrophic processes offer CO2 fixation but lack industrial productivity; heterotrophic fermentation is productive but carbon-inefficient.
- Integrating autotrophic efficiency with heterotrophic productivity is key for circular biomanufacturing.
Purpose of the Study:
- To develop and evaluate a gas-linked co-culture system for enhanced carbon cycling in biomanufacturing.
- To enable spatial separation of heterotrophic and autotrophic metabolisms with gas-phase CO2 exchange.
- To assess the impact on biomass accumulation, value-added metabolite production, and net CO2 emissions.
Main Methods:
- Designed a novel gas-linked co-culture system enabling CO2 transfer between spatially separated heterotrophic and autotrophic microorganisms.
- Facilitated reutilization of CO2 from heterotrophic metabolism by autotrophic metabolism for cooperative carbon cycling.
- Quantified biomass, polyhydroxybutyrate (PHB), and carotenoid production, alongside net CO2 emissions, comparing gas-linked to non-linked controls.
Main Results:
- The gas-linked system significantly enhanced biomass accumulation compared to controls.
- Production of value-added metabolites, including PHB and carotenoids, nearly doubled in the gas-linked system.
- Net CO2 emissions were reduced by 20.62% in the gas-linked co-culture system.
Conclusions:
- Gas-phase integration of trophically distinct cultures provides a promising strategy for circular carbon biorefineries.
- This approach supports cooperative carbon cycling, improving efficiency and sustainability in biomanufacturing.
- Further optimization is needed to achieve fully net-zero CO2 emissions, but the platform shows significant potential.
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