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Evaluation of the influence of different culture media on growth, life cycle, biochemical composition, and astaxanthin production in Haematococcus pluvialis

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Abstract

Haematococcus pluvialis is known as the richest natural source of carotenoid astaxanthin, whose synthesis is related to changes in cells according its complex life cycle and the availability of nutrients present in the culture media. This study’s objective was to evaluate the influence of different culture media under photoautotrophic and mixotrophic conditions on the growth, life cycle, biochemical composition, and astaxanthin production in H. pluvialis. Cultures were performed using the following media: KM1, MM2, Provasoli, modified Provasoli, and how to control the BBM, all kept at 24 ± 1 °C, with constant aeration, light/dark photoperiod 24:0 and irradiance of 60 μmol photons/m2/s. Growth and life cycle were evaluated by daily cell counts under an optical microscope; values of maximum cell density (MCD) and dry biomass were also assessed. Biochemical analyses were chlorophyll (a and b), astaxanthin, total proteins, and fatty acids. Cultivation under photoautotrophic conditions in BBM medium showed higher concentration of chlorophylls a (33 ± 4.0 μg/mL) and b (18 ± 1.6 μg/mL) and protein (62.7 ± 3.38%). Cultivation in modified Provasoli medium, under mixotrophic conditions, showed higher MCD (84.5 ± 11.7), biomass production (4.9 ± 0.0004 mg/mL), fatty acid methyl esters, and astaxanthin productivity (9.28 ± 0.4 mg/L/day). These results demonstrate that the culture media and the culture conditions to which H. pluvialis is submitted stimulate specific metabolic and biosynthetic pathways of the cells, which directly affect the biochemical composition of the microalgae. Modified Provasoli medium proved to be the most efficient in increasing astaxanthin productivity for this species, as it has shown better growth parameters and biomass production.

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Acknowledgements

The authors would like to thank Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for the financial support provided to this the research and partners involved in its execution and to the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for the scholarship granted to the first author. We would also like to thank the Labpratório de Bioprocessos and Central Análitica do Centro de Tecnologias Estratégicas do Nordeste (CETENE).

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Funding

The financial support granted to this research and the scholarships for the researchers involved were made by the following institutions: Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES).

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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Yllana Ferreira Marinho, Carolina Barbosa Malafaia, Katarynna Santos de Araújo, Túlio Diego da Silva, Ana Paula Felipe dos Santos, Laenne Barbara de Moraes, and Alfredo Oliveira Gálvez. The first draft of the manuscript was written by Yllana Ferreira Marinho, and all authors commented on the previous versions of the manuscript.

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Correspondence to Yllana Ferreira Marinho.

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The authors declare no competing interests.

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Marinho, Y.F., Malafaia, C.B., de Araújo, K.S. et al. Evaluation of the influence of different culture media on growth, life cycle, biochemical composition, and astaxanthin production in Haematococcus pluvialis. Aquacult Int 29, 757–778 (2021). https://doi.org/10.1007/s10499-021-00655-z

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  • DOI: https://doi.org/10.1007/s10499-021-00655-z

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