Journal
MARINE DRUGS
Volume 17, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/md17020124
Keywords
Porphyridium; nitrogen; phycoerythrin; exopolysaccharide; polyunsaturated fatty acids
Categories
Funding
- National Natural Science Foundation of China [31602182]
- PhD Start-up Fund of Natural Science Foundation of Guangdong Province [2016A030310016]
- Science and Technology Planning Project of Fujian Province [2013T3008]
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Microalgae of the genus Porphyridium show great potential for large-scale commercial cultivation, as they accumulate large quantities of B-phycoerythrin (B-PE), long chain polyunsaturated fatty acids (LC-PUFAs) and exopolysaccharide (EPS). The present study aimed to adjust culture nitrogen concentrations to produce Porphyridium biomass rich in B-PE, LC-PUFAs and EPS. Porphyridium purpureum SCS-02 was cultured in ASW culture medium with low nitrogen supply (LN, 3.5 mM), medium nitrogen supply (MN, 5.9 mM) or high nitrogen supply (HN, 17.6 mM). HN significantly enhanced the accumulation of biomass, intracellular protein, B-PE and eicosapentaenoic acid. LN increased the intracellular carbohydrate and arachidonic acid content, and promoted the secretion of EPS. The total lipids content was almost unaffected by nitrogen concentration. Based on these results, a semi-continuous two-step process was proposed, which included the production of biomass rich in B-PE and LC-PUFAs with sufficient nitrogen, and induced EPS excretion with limited nitrogen and strong light.
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