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Light regime and growth phase affect the microalgal production of protein quantity and quality with Dunaliella salina

Light regime and growth phase affect the microalgal production of protein quantity and quality with Dunaliella salina

Sui, Yixing ORCID: 0000-0003-2646-5773, Muys, Maarten, Vermeir, Pieter, D'Adamo, Sarah and Vlaeminck, Siegfried E. ORCID: 0000-0002-2596-8857 (2018) Light regime and growth phase affect the microalgal production of protein quantity and quality with Dunaliella salina. Bioresource Technology, 275. pp. 145-152. ISSN 0960-8524 (doi:https://doi.org/10.1016/j.biortech.2018.12.046)

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Abstract

The microalga Dunaliella salina has been widely studied for carotenogenesis, yet its protein production for human nutrition has rarely been reported. This study unveils the effects of growth phase and light regime on protein and essential amino acid (EAA) levels in D. salina. Cultivation under 24-h continuous light was compared to 12-h/12-h light/dark cycle. The essential amino acid index (EAAI) of D. salina showed accumulating trends up to 1.53 in the stationary phase, surpassing FAO/WHO standard for human nutrition. Light/dark conditions inferred a higher light-usage efficiency, yielding 5–97% higher protein and 18–28% higher EAA mass on light energy throughout the growth, accompanied by 138% faster growth during the light phase of the light/dark cycle, compared to continuous light. The findings revealed D. salina to be especially suitable for high-quality protein production, particularly grown under light/dark conditions, with nitrogen limitation as possible trigger, and harvested in the stationary phase.

Item Type: Article
Uncontrolled Keywords: single-cell protein, microbial protein, microalgae, food, photoperiod
Subjects: Q Science > Q Science (General)
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Algal Biotechnology Research Group
Faculty of Engineering & Science > School of Science (SCI)
Last Modified: 27 Apr 2020 10:11
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
Selected for REF2021: REF 3
URI: http://gala.gre.ac.uk/id/eprint/27752

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