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26.03.2024 | Original Paper

Biorefinery approach to stimulate astaxanthin and biofuel generation in microalga Haematococcus pluvialis under different light irradiance

verfasst von: Zahra Zarei, Hajar Zamani

Erschienen in: Clean Technologies and Environmental Policy

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Abstract

The main focus of this study was on a biorefinery approach using the microalga Haematococcus pluvialis for the production of the valuable bioproduct astaxanthin. In addition, the study aimed to explore the use of residual algal biomass for biodiesel production. Accordingly, the impact of two light intensities (16 and 66 µmol photons m−2 s−1) during short (20 days) and prolonged (50 days) photoperiods was examined on the growth parameters, chlorophylls, astaxanthin, and biochemical compounds along with fatty acid (FA) profile of H. pluvialis. Moreover, the physical and chemical properties of H. pluvialis derived biodiesel were evalutaed. Results revealed that higher light exposure (66 µmol photons m−2 s−1) increased the algal biomass (g L−1) and biomass productivity (mg L−1 d−1) of H. pluvialis during both short and prolonged photoperiods. Additionally, the highest chlorophyll (a + b) (mg g−1) content was found in cultures exposed to low light (16 µmol photons m−2 s−1) during 20 and 50 days of the experiment. Whilst the cultures under higher light conditions exhibited the highest astaxanthin content (mg g−1) over the induction period. Furthermore, the biochemical composition of cells changed under different light intensities in this study. The algal cultures under higher light conditions remarkably increased in lipid content along with a significant decrease in protein and carbohydrate contents. Besides, all the FA components in algal biomass under low and higher light conditions were acceptable to produce biodiesel. The highest theoretical methane potential was obtained in algal cells cultivated under higher light conditions with a short photoperiod. The results of this study hold the potential to contribute significantly towards the development of an integrated, cost-effective biorefinery strategy aimed at the simultaneous production of astaxanthin and biodiesel.

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Metadaten
Titel
Biorefinery approach to stimulate astaxanthin and biofuel generation in microalga Haematococcus pluvialis under different light irradiance
verfasst von
Zahra Zarei
Hajar Zamani
Publikationsdatum
26.03.2024
Verlag
Springer Berlin Heidelberg
Erschienen in
Clean Technologies and Environmental Policy
Print ISSN: 1618-954X
Elektronische ISSN: 1618-9558
DOI
https://doi.org/10.1007/s10098-024-02803-4