Question

The effect of sodium bicarbonate supplementation on growth and biochemical composition of marine

Answer 1

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The addition of bicarbonate to microalgal cultures has been evaluated for two species  in respect of growth and biochemical composition. In batch cultures, addition of bicarbonate resulted in significantly  higher final mean cell abundances for both species. No differences in specific growth rates  were recorded for T. suecica between treatments; however, increasing bicarbonate addition decreased SGR values in N. salina cultures. Bicarbonate addition  significantly improved nitrate utilisation from the external media and photosynthetic efficiency  in both species. For both T. suecica and N. salina, bicarbonate addition significantly increased the cellular concentrations of total pigment compared to cultures with no additional bicarbonate. Moreover, final concentrations of total cellular fatty acids in T. suecica and N. salina cultures supplemented with 2 g L−1 bicarbonate (7.6 ± 1.2 and 1.8 ± 0.1 pg cell−1, respectively) were significantly higher than those cells supplemented with 0 or 1 g L−1 bicarbonate. In nitrate-deplete cultures, bicarbonate addition caused species-specific differences in the rate of cellular lipid production, rates of change in fatty acid composition and final lipid levels. In summary, the addition of sodium bicarbonate is a viable strategy to increase cellular abundance and concentrations of pigments and lipids in some microalgae as well as the rate of lipid accumulation in nitrate-deplete cultures.

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