Amino acid profile and protein bioaccessibility of two Galdieria sulphuraria strains cultivated autotrophically and mixotrophically in pilot-scale photobioreactors

Galdieria sulphuraria is considered one of the most promising microalgae for food applications. In this study, we compared two strains G. cultivated autotrophically and mixotrophically over 35 days in pilot-scale photobioreactors under nonsterile conditions. The low pH (<1.9) used cultivation successfully prevented microbial contamination. had similar autotrophic mixotrophic biomass productivities, latter being 2.3 times higher than productivity. Comparing strains, SAG 108.79 ACUF 064 51% 64% (w/w) protein 4% 9% C-phycocyanin content, respectively. Interestingly, showed a bioaccessibility 62%, line with other microalgal species, whereas only 14%. No differences amino acid profile were found between or trophic modes. Stable well-balanced profiles are encouraging results future applications species. main focus study was production single-cell proteins using polyextremophilic sulphuraria. acidic condition sufficient to guarantee axenic not sterile conditions, even presence glucose. Both rich all essential acids. there 4.4-fold difference strains. Simple an result