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<p>Elevated atmospheric CO₂ emissions are the primary contributor to global warming, and cyanobateria offer a sustainable solution through biological carbon fixation. Therefore, this study aims to evaluate the impact of CO₂ supplementation on the growth, biomass productivity, and biochemical composition of <i>Baaleninema</i> sp. InaCC.M217, an Indonesian strain newly positioned phylogenetically in marine <i>Geitlerinema</i> based on 16S rDNA and ITS genes. Cultures were cultivated in Seawater-Batam (SWBT) medium under three CO₂ concentrations of 0, 10, and 20&#xa0;mL over eight days. Growth rate, biomass yield, CO₂ fixation, and cellular contents of carbohydrate, protein, and lipid were measured. The results showed that different CO₂ supplementation influenced the pH change, ranging from 6 to 8.5 during cultivation. The 10&#xa0;mL CO₂ treatment at pH 8.5 caused the highest specific growth rate (0.1280 ± 0.0154/day), biomass productivity (0.1312 ± 0.0025&#xa0;mg/mL/day), and CO₂ fixation rate (0.2401 ± 0.00464&#xa0;mg/mL/day). Under this condition, InaCC.M217 also showed elevated metabolite levels, including 31% carbohydrates, 28% proteins, and 23% lipids. Statistical analysis (α = 0.05) confirmed that CO₂ supplementation significantly affected biomass production and biochemical composition. These results suggested that 10&#xa0;mL CO₂ at pH 8.5 was an optimal condition for maximizing growth and carbon fixation in InaCC.M217. In conclusion, InaCC.M217 demonstrated strong potential as a biofixation agent for reducing atmospheric CO₂, underscoring the significant value for sustainable carbon management in marine systems.</p>

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CO₂-Supplemented Cultivation of Baaleninema sp. InaCC.M217: Growth Performance and Metabolite Accumulation

  • 期刊论文

  • 发表日期：

    2026年5月22日

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  • Muhamad Amrulloh,
  • Rose Dewi,
  • Delicia Yunita Rahman,
  • Hani Susanti

摘要

Elevated atmospheric CO₂ emissions are the primary contributor to global warming, and cyanobateria offer a sustainable solution through biological carbon fixation. Therefore, this study aims to evaluate the impact of CO₂ supplementation on the growth, biomass productivity, and biochemical composition of Baaleninema sp. InaCC.M217, an Indonesian strain newly positioned phylogenetically in marine Geitlerinema based on 16S rDNA and ITS genes. Cultures were cultivated in Seawater-Batam (SWBT) medium under three CO₂ concentrations of 0, 10, and 20 mL over eight days. Growth rate, biomass yield, CO₂ fixation, and cellular contents of carbohydrate, protein, and lipid were measured. The results showed that different CO₂ supplementation influenced the pH change, ranging from 6 to 8.5 during cultivation. The 10 mL CO₂ treatment at pH 8.5 caused the highest specific growth rate (0.1280 ± 0.0154/day), biomass productivity (0.1312 ± 0.0025 mg/mL/day), and CO₂ fixation rate (0.2401 ± 0.00464 mg/mL/day). Under this condition, InaCC.M217 also showed elevated metabolite levels, including 31% carbohydrates, 28% proteins, and 23% lipids. Statistical analysis (α = 0.05) confirmed that CO₂ supplementation significantly affected biomass production and biochemical composition. These results suggested that 10 mL CO₂ at pH 8.5 was an optimal condition for maximizing growth and carbon fixation in InaCC.M217. In conclusion, InaCC.M217 demonstrated strong potential as a biofixation agent for reducing atmospheric CO₂, underscoring the significant value for sustainable carbon management in marine systems.