Article Dans Une Revue Algal Research - Biomass, Biofuels and Bioproducts Année : 2025

Influence of seawater treatment by ultrafiltration and culture conditions on the biochemical composition of the diatom Odontella aurita

Résumé

Microalgae synthesized several biologically active substances. Their rapid growth rate and cellular plasticity in response to changing culture conditions renders microalgae a virtually inexhaustible resource with considerable industrial potential. However, the utilisation of this resource at industrial scale is subject to several constraints, both biological and technical, including contamination and predation, as well as the difficulty of processing very large volumes of water. This study ascertains the impact of culture conditions on the growth and biochemical composition of the marine diatom Odontella aurita and more especially the water treatment by ultrafiltration. Based on an original approach by an experimental design, results are presented to evaluate the impact of the culture parameters through a quantitative and qualitative analyzes on biomass concentration and microalgae growth in terms of the productivity, the dry weight composition and the cell composition. For the first time, a study shows that the seawater ultrafiltration process, utilized as a seawater treatment for microalgae cultivation, exerted a substantial influence on the growth dynamics of the culture, leading to an average increase in cell concentration of 47.5 % compared to cultures in chlorinated seawater. Additionally, the impact of this process on the biochemical composition of the biomass was noteworthy, as it leaded to an improvement in overall productivity (an augmentation x 1.76 of dry mass production) and a shift toward enhanced protein and carbohydrate production. Ultrafiltration resulted in a biochemical profile of the algal biomass that was composed mainly of proteins, carbohydrates and pigments. In contrast, the use of chlorinated water favours the proportion of lipids and minerals.

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hal-05296601 , version 1 (12-03-2026)

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Stacy Ragueneau, Camille Benard-Pardell, Clémence Cordier, Adeline Lange, Magalie Claeys-Bruno, et al.. Influence of seawater treatment by ultrafiltration and culture conditions on the biochemical composition of the diatom Odontella aurita. Algal Research - Biomass, Biofuels and Bioproducts, 2025, 91, pp.104207. ⟨10.1016/j.algal.2025.104207⟩. ⟨hal-05296601⟩
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