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<p>Marennine is a blue pigment excreted by the diatom <i>Haslea ostrearia</i>. This pigment is renowned for its antioxidant and antibacterial properties, which have raised research interest. The standard method for obtaining marennine is by harvesting the supernatant from cultures of <i>H. ostrearia</i> and applying a double ultrafiltration approach. Marennine concentration is then assessed by another standard method (UV-visible spectrophotometry). The resulting “blue water” may however contain marennine along with a variety of other molecules, not detectable by spectrophotometry. As changes in supernatant composition are likely to occur depending on culture conditions and modes of operation, it is wondered whether this affects the marennine extract’s quality. This work aims to assess such fluctuations across the exponential, stationary, and senescent phases of a <i>H. ostrearia</i> culture in a membrane photobioreactor (MPBR). Antioxidant and antibacterial bioassays, in conjunction with spectral analyses of marennine extracts, were used to characterize them. Results showed that marennine production peaked during exponential growth phase of the culture and that the resulting extract exhibited the highest antibacterial activity. Antioxidant activity was however unaffected throughout the different growth phases, being solely a function of the marennine concentration as assessed by the standard measurement approach.</p>

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Investigation of marennine quality throughout the main culture phases of Haslea ostrearia in a membrane photobioreactor

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Elodie Pedron,
  • Jean-Luc Mouget,
  • Marylise Duperthuy,
  • Annabelle Mathieu-Denoncourt,
  • Céline Laroche,
  • Réjean Tremblay,
  • Jean-Sébastien Deschênes,
  • Olivier Gonçalves,
  • Anthony Massé

摘要

Marennine is a blue pigment excreted by the diatom Haslea ostrearia. This pigment is renowned for its antioxidant and antibacterial properties, which have raised research interest. The standard method for obtaining marennine is by harvesting the supernatant from cultures of H. ostrearia and applying a double ultrafiltration approach. Marennine concentration is then assessed by another standard method (UV-visible spectrophotometry). The resulting “blue water” may however contain marennine along with a variety of other molecules, not detectable by spectrophotometry. As changes in supernatant composition are likely to occur depending on culture conditions and modes of operation, it is wondered whether this affects the marennine extract’s quality. This work aims to assess such fluctuations across the exponential, stationary, and senescent phases of a H. ostrearia culture in a membrane photobioreactor (MPBR). Antioxidant and antibacterial bioassays, in conjunction with spectral analyses of marennine extracts, were used to characterize them. Results showed that marennine production peaked during exponential growth phase of the culture and that the resulting extract exhibited the highest antibacterial activity. Antioxidant activity was however unaffected throughout the different growth phases, being solely a function of the marennine concentration as assessed by the standard measurement approach.