Optimization of carbohydrate productivity of Spirulina microalgae as a potential feedstock for bioethanol production
2019
Tourang, M. | Baghdadi, M. | Torang, A. | Sarkhosh, S.
The main goal of this research is to use the biomass productivity, carbohydrate content, and carbohydrate productivity as useful responses for optimization of macronutrients concentrations (K₂HPO₄, NaHCO₃, and NaNO₃) in cultivation of Spirulina microalgae as a feedstock for bioethanol production. In this study, individual and synergistic effects of medium components on the mentioned responses were investigated. The culture medium was optimized using central composite design for achieving the maximize biomass productivity (165 mg L⁻¹ day⁻¹ at K₂HPO₄: 438 mg L⁻¹, NaHCO₃: 15.92 g L⁻¹, and NaNO₃: 0.5 g L⁻¹), carbohydrate content (42.0% of dry mass at K₂HPO₄: 192 mg L⁻¹, NaHCO₃: 5.71 g L⁻¹, and NaNO₃: 0.63 g L⁻¹), and finally carbohydrate productivity (56.97 mg L⁻¹ day⁻¹ at K₂HPO₄: 359 mg L⁻¹, NaHCO₃: 9.80 g L⁻¹, and NaNO₃: 0.60 g L⁻¹). The most significant factors on the biomass productivity and carbohydrate productivity were K₂HPO₄ and NaHCO₃. On the other hand, NaHCO₃ was the most effective factor on the carbohydrate content. The results showed a significant interaction between K₂HPO₄ and NaNO₃ (p value < 0.05) on the biomass productivity and carbohydrate productivity. In addition, the model revealed a significant interaction between K₂HPO₄ and NaHCO₃ on the carbohydrate content. The concentrations of NaNO₃ and NaHCO₃ in modified medium were remarkably lower than those in Zarrouk medium. Some possible metabolic pathways causing these effects and interactions were discussed.
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