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

Pédron, Élodie, Mouget, Jean-Luc, Duperthuy, Marylise, Mathieu-Denoncourt, Annabelle, Laroche, Céline, Tremblay, Réjean ORCID: https://orcid.org/0000-0003-2590-8915, Deschênes, Jean-Sébastien, Gonçalves, Olivier et Massé, Anthony (2025). Investigation of marennine quality throughout the main culture phases of Haslea ostrearia in a membrane photobioreactor. Journal of Applied Phycology, 37 . pp. 3939-3953.

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Résumé

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.

Type de document :	Article
Validation par les pairs :	Oui
Information complémentaire :	En libre accès sous licence Springer Nature B.V. 2025
Mots-clés :	Haslea ostrearia ; Pigments ; Marénine ; Bioactivités ; Indicateurs de qualité ; Conditions de production / Haslea ostrearia ; Pigments ; Marennine ; Bioactivities ; Quality indicators ; Production conditions.
Départements et unités départementales :	Institut des sciences de la mer de Rimouski (ISMER)
Date de dépôt :	31 mars 2026 13:51
Dernière modification :	31 mars 2026 13:51
URI :	https://semaphore.uqar.ca/id/eprint/3521