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Abstract
G. sulphuraria is a polyextremophilic microalga that can tolerate low pH, high temperature and high osmotic pressure. We cultivated G. sulphuraria ACUF 064 in chemostat at a biomass concentration of 134 to 243 g·m−2 aiming for maximal pigment content without compromising biomass productivity. Autotrophy was compared to ‘oxygen balanced’ mixotrophy with intracellular recirculation of oxygen and carbon dioxide. No differences were found in C-phycocyanin (C-PC) and protein content between autotrophic and mixotrophic cultures. In mixotrophy the biomass productivity and concentration were doubled compared to the photoautotrophic counterpart. In mixotrophy aeration was not needed and 89% of the substrate carbon was converted into biomass. Mixotrophically grown biomass contained 10% w/w C-PC which, combined with its high areal biomass productivity (49 g·m−2·day−1), sums up as one of the highest C-PC areal productivities ever reported (5 g·m−2·day−1) under 24 h/24 h illumination. C-PC extracted from G. sulphuraria was more stable than the currently used C-PC extracts from Spirulina. No significant loss of color was observed down to a pH of 3 and up to a temperature of 55 °C. G. sulphuraria had a protein content of 62% w/w and compared favorably with FAO dietary recommendation of adults regarding amino acid composition. G. sulphuraria contains a high proportion of essential, sulfur amino acids compared to Chlorella, Spirulina and soybean protein. Due to its attractive amino acid profile and high protein content, G. sulphuraria is a good candidate for food and feed applications to overcome sulfur amino acid deficiencies. In addition, oxygen balanced mixotrophy allows for efficient and productive cultivation of G. sulphuraria biomass.
Original language | English |
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Article number | 102603 |
Journal | Algal Research |
Volume | 61 |
DOIs | |
Publication status | Published - Jan 2022 |
Keywords
- Acid stable phycocyanin
- Amino acid profile
- Oxygen balance
- Phycocyanin productivity
- Protein production
- Thermo stable phycocyanin
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Dive into the research topics of 'Mixotrophic cultivation of Galdieria sulphuraria for C-phycocyanin and protein production'. Together they form a unique fingerprint.Press/Media
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Algae inspire poetry in blue
2/06/22 → 3/06/22
2 Media contributions
Press/Media: Expert Comment › Professional
Projects
- 1 Active
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ProFuture: MICROALGAE PROTEIN INGREDIENTS FOR THE FOOD AND FEED OF THE FUTURE
1/10/19 → 30/09/23
Project: EU research project