Abstract
The type of change in the pigment content of Porphyridium purpureum has been investigated in quasi-continuous cultures. The possibility of regulating the pigment content with varying specific flow rates has been shown. The relative content of pigments in biomass of P. purpureum in the range of specific flow rates of the medium 0.1−0.4 day−1 increased 50%. Productivity of P. purpureum increases with the growth of specific flow rates of the medium. The highest productivity of biomass and pigments is realized in the range of flow rates of the medium 0.3−0.4 day&minus1, and reaches of biomass − 0.5 g AFDW · L−1 day−1 and of B-phycoerythrin − 40 mg · L−1 day−1. The maximum pigment content in the biomass of P. purpureum was recorded at the specific flow rate 0.3−0.4 day−1. Productivity of quasi-continuous cultures of P. purpureum inbiomass and pigments is 1.5−3 times higher than its productivity in batch culture; these results are confirmed by experimental data.
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