Productivity, amino acid profile, and protein bioaccessibility in heterotrophic batch cultivation of Galdieria sulphuraria
Open access
Date
2024-05Type
- Journal Article
ETH Bibliography
yes
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Abstract
The polyextremophilic Galdieria sulphuraria is emerging as a promising microalgal species for food applications. This work explores the potential of heterotrophically cultivated G. sulphuraria as a protein producer for human consumption. To this end, the performances of four G. sulphuraria strains grown under the same conditions were compared. Amino acid profiles varied among strains and growth phases, but all samples met FAO dietary requirements for adults. The specific growth rates were between 1.01 and 1.48 day−1. After glucose depletion, all strains showed an increase of 38–49 % in nitrogen content within 48 h, reaching 7.8–12.0 % w/w. An opposite trend was observed in protein bioaccessibility, which decreased on average from 69 % during the exponential phase to a minimum of 32 % 48 h after stationary phase, with significant differences among the strains. Therefore, selecting the appropriate strain and harvesting time is crucial for successful single-cell protein production. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000665752Publication status
publishedExternal links
Journal / series
Bioresource TechnologyVolume
Pages / Article No.
Publisher
ElsevierSubject
Microalgae; Extremophile; Single cell protein; Strain selection; In vitro digestion; Biomass yield on substrate; Nitrogen to protein conversionOrganisational unit
09571 - Mathys, Alexander / Mathys, Alexander
Funding
21-2 FEL-28 - Volcanic protein (ETHZ)
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ETH Bibliography
yes
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