Influence of light absorption rate on the astaxanthin production by the microalga Haematococcus pluvialis during nitrogen starvation - Nantes Université Accéder directement au contenu
Article Dans Une Revue Bioresources and Bioprocessing Année : 2023

Influence of light absorption rate on the astaxanthin production by the microalga Haematococcus pluvialis during nitrogen starvation

Résumé

Large amounts of astaxanthin (about 4% DW) can be produced under nitrogen starvation of Haematococcus pluvialisin photobioreactors (PBRs) exposed to high light conditions to induce a light stress. However, in PBR, the large bio-mass concentration usually achieved leads to strong light attenuation conditions, which makes complex the analysisof this “light stress”. This study aims to elucidate the role of light transfer in astaxanthin cell content and produc-tivity from the microalga Haematococcus pluvialis during nitrogen starvation. Haematococcus pluvialis was culti-vated in a flat-panel PBR in a batch mode with sudden nitrogen starvation conditions and an incident photon fluxdensity (PFD) of 250 μmolhν m−2 s−1 . Different initial biomass concentrations (Cx0 ) were evaluated, 0.21, 0.52, 1.39and 2.21 kg m−3. As a result, spectral mass absorption cross-sections of Haematococcus pluvialis were measuredat different times during nitrogen starvation, and were used to relate the mean rate of photon absorption (MRPA)to the astaxanthin productivity. A minimum initial MRPA of 7000 ± 500 μmolhν kgx−1 s−1 was found necessary to trig-ger large accumulation of astaxanthin in Haematococcus pluvialis cells (up to 3.21% DW) during nitrogen starvationconditions. The results also demonstrated the link between the MRPA and the daily astaxanthin productivity of Haem-atococcus pluvialis cultures, introducing then the MRPA as a physical quantity of interest for a rational optimizationof the light culture conditions in PBRs.
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hal-04590849 , version 1 (28-05-2024)

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Khadija Samhat, Antoinette Kazbar, Hosni Takache, Ali Ismail, Jeremy Pruvost. Influence of light absorption rate on the astaxanthin production by the microalga Haematococcus pluvialis during nitrogen starvation. Bioresources and Bioprocessing, 2023, 10 (1), ⟨10.1186/s40643-023-00700-0⟩. ⟨hal-04590849⟩
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