Effects of Culture Medium Enrichment with Zinc on Astaxanthin Accumulation in a New Strain of the Microalga <i>Dysmorphococcus globosus</i>

Effects of Culture Medium Enrichment with Zinc on Astaxanthin Accumulation in a New Strain of the Microalga <i>Dysmorphococcus globosus</i>

High Zn<sup>2+</sup> concentrations in microalgal cells that produce astaxanthin as a feed additive can reduce the symptoms of malnutrition in aquatic animals. Therefore, in this study, we analysed the effect of Zn<sup>2+</sup> in the culture medium on the growth of a newly i...

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Bibliographic Details
Main Authors: Zhaohui Zan, Xinxin Huang, Zahid Hussain, Moyu Zhong, Chenyang Hou, Maozhi Ren, Xiulan Xie
Format: Article
Language:English
Published: MDPI AG 2024-11-01
Series:Plants
Subjects:
astaxanthin
zinc enrichment
microalgae
hidden starvation
one health
nutritional value
Online Access:https://www.mdpi.com/2223-7747/13/23/3338
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Summary:High Zn<sup>2+</sup> concentrations in microalgal cells that produce astaxanthin as a feed additive can reduce the symptoms of malnutrition in aquatic animals. Therefore, in this study, we analysed the effect of Zn<sup>2+</sup> in the culture medium on the growth of a newly isolated microalgal strain <i>Dysmorphococcus globosus</i> ZY24. Zn<sup>2+</sup> and white light stress altered the pigment content in microalgal cells. In addition, high Zn<sup>2+</sup> concentrations in the culture medium altered cell morphology and chlorophyll fluorescence and also increased intracellular Zn<sup>2+</sup> accumulation. Further, an optimal Zn<sup>2+</sup> concentration in the culture medium promoted the synthesis of astaxanthin and other pigments. When the concentration of Zn<sup>2+</sup> was 45.5 mg L<sup>−1</sup>, <i>Dysmorphococcus globosus</i> ZY24 produced 0.31 mg g<sup>−1</sup> astaxanthin, whereas the total zinc content of the microalgae was 4337 mg kg<sup>−1</sup>. This study confirmed that microalgae have a high capacity for Zn<sup>2+</sup> enrichment, providing a theoretical basis for studying Zn<sup>2+</sup> enrichment in microalgae. Furthermore, Zn<sup>2+</sup> supplementation to stimulate astaxanthin production in microalgae is a practical method to enhance their nutritional value.
ISSN:2223-7747

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