Effects of Culture Medium Enrichment with Zinc on Astaxanthin Accumulation in a New Strain of the Microalga Dysmorphococcus globosus
2024
Zhaohui Zan | Xinxin Huang | Zahid Hussain | Moyu Zhong | Chenyang Hou | Maozhi Ren | Xiulan Xie
High Zn2+ 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 Zn2+ in the culture medium on the growth of a newly isolated microalgal strain Dysmorphococcus globosus ZY24. Zn2+ and white light stress altered the pigment content in microalgal cells. In addition, high Zn2+ concentrations in the culture medium altered cell morphology and chlorophyll fluorescence and also increased intracellular Zn2+ accumulation. Further, an optimal Zn2+ concentration in the culture medium promoted the synthesis of astaxanthin and other pigments. When the concentration of Zn2+ was 45.5 mg L&minus:1, Dysmorphococcus globosus ZY24 produced 0.31 mg g&minus:1 astaxanthin, whereas the total zinc content of the microalgae was 4337 mg kg&minus:1. This study confirmed that microalgae have a high capacity for Zn2+ enrichment, providing a theoretical basis for studying Zn2+ enrichment in microalgae. Furthermore, Zn2+ supplementation to stimulate astaxanthin production in microalgae is a practical method to enhance their nutritional value.
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