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<p><i>Haematococcus pluvialis</i>, the main source for natural astaxanthin, is grown widely in enclosed tubular photo-bioreactors (ETPBRs), characterized by high dissolved oxygen concentrations (DOCs). This study assessed the influence of increasing daylight DOCs on <i>H. pluvialis</i> growth and astaxanthin accumulation in outdoor cultures. “Green” and “red” <i>H. pluvialis</i> cultures were grown outdoors for 7–8&#xa0;days, under artificially increasing DOCs (115% to 430% saturation), while several parameters concerning&#xa0;growth and astaxanthin accumulation were measured. It was found that DOCs above atmospheric levels impair specific growth rate, cell division and photosynthetic efficiency in the "green" non-stressed stage (GS), and volumetric astaxanthin accumulation in the "red" stressed stage (RS). At DOC of 400% saturation and full sunlight, growth rate in the GS was 37.6% of the control and at 413% saturation, volumetric astaxanthin content at the end of the RS was 62% of the control. Unlike past results, low astaxanthin productivity in the RS, at high DOCs, resulted from low biomass productivity rather than from per-biomass (gravimetric) astaxanthin content, which remained unchanged. The combined effect of high DOC and light on growth and productivity, in both GS and RS, is discussed. Our results indicate that low DOCs must be maintained in outdoor <i>H. pluvialis</i> cultures for maximal growth and astaxanthin productivity.</p>

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High dissolved oxygen concentrations reduce growth and astaxanthin accumulation in Haematococcus pluvialis outdoor cultures

  • 期刊论文

  • 发表日期：

    2025年9月13日

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  • G. Banet,
  • A. Drory

摘要

Haematococcus pluvialis, the main source for natural astaxanthin, is grown widely in enclosed tubular photo-bioreactors (ETPBRs), characterized by high dissolved oxygen concentrations (DOCs). This study assessed the influence of increasing daylight DOCs on H. pluvialis growth and astaxanthin accumulation in outdoor cultures. “Green” and “red” H. pluvialis cultures were grown outdoors for 7–8 days, under artificially increasing DOCs (115% to 430% saturation), while several parameters concerning growth and astaxanthin accumulation were measured. It was found that DOCs above atmospheric levels impair specific growth rate, cell division and photosynthetic efficiency in the "green" non-stressed stage (GS), and volumetric astaxanthin accumulation in the "red" stressed stage (RS). At DOC of 400% saturation and full sunlight, growth rate in the GS was 37.6% of the control and at 413% saturation, volumetric astaxanthin content at the end of the RS was 62% of the control. Unlike past results, low astaxanthin productivity in the RS, at high DOCs, resulted from low biomass productivity rather than from per-biomass (gravimetric) astaxanthin content, which remained unchanged. The combined effect of high DOC and light on growth and productivity, in both GS and RS, is discussed. Our results indicate that low DOCs must be maintained in outdoor H. pluvialis cultures for maximal growth and astaxanthin productivity.