ArticleCurrent microbiology2026
CO₂-Supplemented Cultivation of Baaleninema sp. InaCC.M217: Growth Performance and Metabolite Accumulation.
Article in Current microbiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
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.
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