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<p>Phycobiliproteins and microalgal exopolysaccharides serve as natural pigments and functional additives in food applications. Current production primarily relies on multicellular algae, where yields are constrained by challenges in achieving high-density cultivation. This study investigated photoperiod effects on growth and production of phycobiliproteins and polysaccharides in two unicellular red algae (<i>Porphyridium purpureum</i> and <i>Porphyridium aerugineum</i>). Results demonstrated that short photoperiods enhanced the accumulation of core phycobiliproteins, specifically by increasing phycoerythrin in <i>P. purpureum</i> to a maximum of 30.5 ± 0.8&#xa0;mg/g DW and phycocyanin in <i>P. aerugineum</i> to 41.9 ± 0.2&#xa0;mg/g DW. Conversely, long photoperiods promoted biomass accumulation, yielding peak phycoerythrin production (140.6 ± 0.9&#xa0;mg/L) in <i>P. purpureum</i> and phycocyanin (137.7 ± 1.2&#xa0;mg/L) in <i>P. aerugineum</i> at day 12. Both species exhibited superior exopolysaccharide production under long photoperiods, though <i>P. purpureum</i> showed significantly higher productivity (898.7 ± 41.0&#xa0;mg/L at day 20). These findings offer strategic solutions for sustainable production of food-grade pigments and polysaccharides through optimized unicellular algal cultivation.</p> Graphical abstract <p></p>

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Comparative analysis of two Porphyridium species for phycobiliprotein and polysaccharide production under different photoperiods

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月26日

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  • Liang Ji,
  • Luxuan Xu,
  • Zhangzhen Chen,
  • Yulong He,
  • Artem Yurevich Manyakhin,
  • Pengfei Cheng,
  • Liyun Sun,
  • Jianhua Fan

摘要

Phycobiliproteins and microalgal exopolysaccharides serve as natural pigments and functional additives in food applications. Current production primarily relies on multicellular algae, where yields are constrained by challenges in achieving high-density cultivation. This study investigated photoperiod effects on growth and production of phycobiliproteins and polysaccharides in two unicellular red algae (Porphyridium purpureum and Porphyridium aerugineum). Results demonstrated that short photoperiods enhanced the accumulation of core phycobiliproteins, specifically by increasing phycoerythrin in P. purpureum to a maximum of 30.5 ± 0.8 mg/g DW and phycocyanin in P. aerugineum to 41.9 ± 0.2 mg/g DW. Conversely, long photoperiods promoted biomass accumulation, yielding peak phycoerythrin production (140.6 ± 0.9 mg/L) in P. purpureum and phycocyanin (137.7 ± 1.2 mg/L) in P. aerugineum at day 12. Both species exhibited superior exopolysaccharide production under long photoperiods, though P. purpureum showed significantly higher productivity (898.7 ± 41.0 mg/L at day 20). These findings offer strategic solutions for sustainable production of food-grade pigments and polysaccharides through optimized unicellular algal cultivation.

Graphical abstract