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Algae-based lutein is sustainable and another eco-friendly alternative to plant and synthetic sources. Lutein is a carotenoid pigment and naturally occurring antioxidant commonly used as a supplement for ocular health. In this study, the co-culture of microalgae and bacteria, Chlorella saccharophila and Exiguobacterium sp., was investigated for enhanced lutein production. The co-culture, particularly under nitrate-depleted conditions with 3% CO₂ supplementation, exhibited the highest lutein productivity (238.31 μg.L−1 d−1), a 1.33-fold and 3.54-fold increase compared to the co-culture nitrate-depleted and mono-culture, respectively. Additionally, the co-culture showed an elevated chlorophyll a level, indicating a positive influence of both bacteria and carbon dioxide (CO₂) on algal photosynthesis. Metabolomics analysis revealed a significant decrease in bacterial trehalose and an increase in algal sucrose, suggesting beneficial metabolic interactions. These findings highlight the potential of co-culture strategies for inducing new metabolite pathways and increasing the yield of valuable compounds, contributing to a circular bioeconomy through CO₂ valorization.

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Beyond Carbon Capture: Trehalose Transforms Algae into Biofactories

  • 章节

  • 发表日期：

    2026年

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  • Makaranga Abdalah,
  • Bharmjeet Singh,
  • Asha Arumugam Nesamma,
  • Pannaga Pavan Jutur

摘要

Algae-based lutein is sustainable and another eco-friendly alternative to plant and synthetic sources. Lutein is a carotenoid pigment and naturally occurring antioxidant commonly used as a supplement for ocular health. In this study, the co-culture of microalgae and bacteria, Chlorella saccharophila and Exiguobacterium sp., was investigated for enhanced lutein production. The co-culture, particularly under nitrate-depleted conditions with 3% CO₂ supplementation, exhibited the highest lutein productivity (238.31 μg.L−1 d−1), a 1.33-fold and 3.54-fold increase compared to the co-culture nitrate-depleted and mono-culture, respectively. Additionally, the co-culture showed an elevated chlorophyll a level, indicating a positive influence of both bacteria and carbon dioxide (CO₂) on algal photosynthesis. Metabolomics analysis revealed a significant decrease in bacterial trehalose and an increase in algal sucrose, suggesting beneficial metabolic interactions. These findings highlight the potential of co-culture strategies for inducing new metabolite pathways and increasing the yield of valuable compounds, contributing to a circular bioeconomy through CO₂ valorization.