The polyextremophilic is emerging as a promising microalgal species for food applications. This work explores the potential of heterotrophically cultivated as a protein producer for human consumption. To this end, the performances of four 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. 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.

中文翻译：

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Galdieria sulfuraria 异养分批培养的生产力、氨基酸谱和蛋白质生物可利用性

多极端微生物正在成为一种有前途的食品应用微藻物种。这项工作探讨了异养培养作为人类消费蛋白质生产者的潜力。为此，对相同条件下生长的四种菌株的性能进行了比较。氨基酸谱因菌株和生长阶段而异，但所有样品均符合粮农组织对成人的膳食要求。具体增长率在1.01至1.48天之间。葡萄糖耗尽后，所有菌株的氮含量在 48 小时内增加了 38-49%，达到 7.8-12.0% w/w。在蛋白质生物可及性方面观察到相反的趋势，从指数期的平均 69% 降至稳定期 48 小时后的最低 32%，菌株之间存在显着差异。因此，选择合适的菌株和收获时间对于单细胞蛋白质的成功生产至关重要。