Enhancing Phycoerythrin Production of Marine Red Microalga <i>Porphyridium purpureum</i> with Low Salinity and Semi-Continuous Culture Strategy.

In the batch culture (the control), the maximum biomass concentration reached 2.64 g L −1 on day 18, after which a decreasing trend was observed.

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In the 30% RM and 50% RM treatments, the phycoerythrin content consistently decreased after each harvest, while the 10% RM treatment showed a slightly increasing trend.

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As shown in Figure 2 c, the exopolysaccharide concentrations in every group showed an increasing trend from day 14.

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