Promoting fucoxanthin accumulation in <i>Phaeodactylum tricornutum</i> by multiple nitrogen supplementation and blue light enhancement.

Zexiong Yang; Runqing Yang; Defei Zhu; Dong Wei

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Promoting fucoxanthin accumulation in Phaeodactylum tricornutum by multiple nitrogen supplementation and blue light enhancement.

Author: Zexiong YANG ¹ ; Runqing YANG ¹ ; Defei ZHU ¹ ; Dong WEI ¹
Author Information

1. School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China.
Publication Type:Journal Article
Keywords: Phaeodactylum tricornutum; blue light; fucoxanthin; nitrogen supplementation; two phases culture
MeSH: Nitrogen; Light; Xanthophylls; Diatoms; Dietary Supplements
From: Chinese Journal of Biotechnology 2023;39(11):4580-4592
CountryChina
Language:Chinese
Abstract: The aim of this study was to promote fucoxanthin accumulation in Phaeodactylum tricornutum by photo-fermentation through optimizing the mode of multiple nitrogen supplementation and blue light enhancement. The results showed that the mixed nitrogen source (tryptone: urea=1:1, N mol/N mol; total nitrogen concentration at 0.02 mol/L) added to the culture system by six times was the best mode in shake flasks. Two-phase culture with light adjustment was then carried out in 5 L photo-fermenter with an enhanced blue light (R: G: B=67.1:16.7:16.3) in the second phase, leading to improved cell density (1.12×10⁸ cells/mL), biomass productivity (330 mg/(d·L)), fucoxanthin content (19.62 mg/g), titer (69.71 mg/L) and productivity (6.97 mg/(d·L)). Compared with one-phase culture under red/blue (R: G: B=70.9:18.3:10.9) light and six-times nitrogen supplementation, the fucoxanthin content was significantly increased by 7.68% (P < 0.05) but the productivity did not change significantly (P > 0.05). Compared with one-phase culture under red/blue (R: G: B=70.9:18.3:10.9) light and one-time nitrogen supplementation, the content and productivity of fucoxanthin were significantly increased by 45.98% and 48.30% (P < 0.05), respectively. This study developed a two-phase culture mode with multiple nitrogen supplementation and blue light enhancement, which effectively promoted the accumulation of fucoxanthin and improved the efficiency of nitrogen source utilization, thus providing a new approach for fucoxanthin accumulation in P. tricornutum by photo-fermentation.