It is shown that cultivation of Porphyridium purpureum using semicontinuous method for optimal selection of key parameters allows to obtain stably high productivity of this species both by biomass, and by its a valuable components in comparison with other modes. Production characteristics of semicontinuous culture P. purpureum has been defined. Productivity of P. purpureum increases with the growth of specific flow rate of the medium. The highest productivity of biomass and pigments is realized in the range of flow rate of the medium 0.3–0.4 day^-1, and reaches: of biomass – 0.5 g AFDW · l^-1 · day^-1 and of B-phycoerythrin – 40 mg · l^-1 · day^-1. The type of change of the pigments content P. purpureum has been determined under semicontinuous cultivation; the possibility of regulation of pigments content with the help of varying the specific flow rate has been shown. The relative content of pigments in the biomass of P. purpureum in the range of specific flow rate of the medium 0.1–0.4 day^-1 increases by 50 %. The maximum pigment content in the biomass of P. purpureum is noted at the specific flow rate 0.3–0.4 day^-1. Productivity of semicontinuous culture P. purpureum by biomass and pigments is 1.5–3 times higher than its productivity by batch cultivation, which is confirmed by experimental data.

Keywords: Porphyridium purpureum, batch culture, semicontinuous culture, the density of the culture, phycobiliproteins, productivity

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