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Applied Microbiology and Biotechnology

, Volume 99, Issue 5, pp 2393–2404 | Cite as

Mixotrophic metabolism of Chlorella sorokiniana and algal-bacterial consortia under extended dark-light periods and nutrient starvation

  • Cynthia Alcántara
  • Carolina Fernández
  • Pedro A. García-Encina
  • Raúl Muñoz
Environmental biotechnology

Abstract

Microalgae harbor a not fully exploited industrial and environmental potential due to their high metabolic plasticity. In this context, a better understanding of the metabolism of microalgae and microalgal-bacterial consortia under stress conditions is essential to optimize any waste-to-value approach for their mass cultivation. This work constitutes a fundamental study of the mixotrophic metabolism under stress conditions of an axenic culture of Chlorella sorokiniana and a microalgal-bacterial consortium using carbon, nitrogen, and phosphorous mass balances. The hydrolysis of glucose into volatile fatty acids (VFA) during dark periods occurred only in microalgal-bacterial cultures and resulted in organic carbon removals in the subsequent illuminated periods higher than in C. sorokiniana cultures, which highlighted the symbiotic role of bacterial metabolism. Acetic acid was preferentially assimilated over glucose and inorganic carbon by C. sorokiniana and by the microalgal-bacterial consortium during light periods. N-NH4 + and P-PO4 −3 removals in the light stages decreased at decreasing duration of the dark stages, which suggested that N and P assimilation in microalgal-bacterial cultures was proportional to the carbon available as VFA to produce new biomass. Unlike microalgal-bacterial cultures, C. sorokiniana released P-PO4 −3 under anaerobic conditions, but this excretion was not related to polyhydroxybutyrate accumulation. Finally, while no changes were observed in the carbohydrate, lipid and protein content during repeated extended dark-light periods, nutrient deprivation boosted both C-acetate and C-glucose assimilation and resulted in significantly high biomass productivities and carbohydrate contents in both C. sorokiniana and the microalgal-bacterial cultures.

Keywords

Algal-bacterial consortium Bioremediation C. sorokiniana Extended dark-light periods Mass balances Nutrient deprivation 

Notes

Acknowledgments

This research was supported by the regional government of Castilla y León and the European Social Fund (Contract N° E-47-2011-0053564 and Project Ref. GR76). The financial support of the Ministry of Economy and Competitiveness and the National Institute for Agricultural Research and Technology and Food is also gratefully acknowledged (Project Ref. RTA2013-00056-C03-02).

Supplementary material

253_2014_6125_MOESM1_ESM.docx (45 kb)
ESM 1 (docx 45.1 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Cynthia Alcántara
    • 1
  • Carolina Fernández
    • 1
  • Pedro A. García-Encina
    • 1
  • Raúl Muñoz
    • 1
  1. 1.Department of Chemical Engineering and Environmental TechnologyValladolid UniversityValladolidSpain

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