Toward Sustainability: Intensification of Light-Driven Whole Cell Biocatalysis

Area of Science:

• Biotechnology
• Sustainable Chemistry

Background:

• Photobiocatalysis using photoautotrophic whole cells offers sustainable production of chiral molecules and platform chemicals.
• Directly coupling enzymatic transformations with natural photosynthesis enhances atom efficiency compared to heterotrophic methods.
• Challenges in scaling up photobiocatalysis include light attenuation in photobioreactors.

Purpose of the Study:

• To review recent advancements in whole-cell phototransformations, focusing on process conditions.
• To discuss strategies for intensifying photobiocatalysis through reactor design, immobilization, and strain development.
• To analyze the sustainability of photosynthesis-driven biotechnology.

Main Methods:

• Review of recent literature on whole-cell photobiocatalysis and process intensification.
• Analysis of reactor design, immobilization techniques, and photoautotrophic strain development.
• Sustainability assessment comparing different electron donors and process parameters.

Main Results:

• Whole-cell photobiocatalysis shows promise for sustainable chemical synthesis under mild conditions.
• Improved reactor design, immobilization, and fast-growing strains can intensify the process.
• Replacing organic donors with water splitting doesn't automatically ensure carbon negativity.

Conclusions:

• Photosynthesis-driven biotechnology can significantly reduce CO2 emissions when combined with high substrate loadings, wastewater utilization, and optimized downstream processing.
• Further research into process intensification and strain engineering is crucial for large-scale photobiocatalysis.
• Sustainability of these processes depends on multiple factors beyond just the electron donor source.