Abstract
Production of astaxanthin by sequential heterotrophic-photoautotrophiccultivation of a green alga, Haematococcus pluvialis was investigated.This involved cultivating the cells heterotrophically to high cellconcentration, followed by illumination of the culture for astaxanthinaccumulation. The optimum pH and temperature for heterotrophic biomassproduction were 8 and 25 °C, respectively. There was no significantdifference in the specific growth rate of the cells when acetateconcentration was varied between 10 mM and 30 mM. However, cellgrowth was inhibited at higher acetate concentrations. A pH stat methodwas then used for fed-batch heterotrophic culture, using acetate as theorganic carbon source. A cell concentration of 7 g L-1 wasobtained. Higher cell concentration could not be obtained because the cellschanged from vegetative to cyst forms during the heterotrophic cultivation.However, by using repeated fed-batch processes, the cells could bemaintained in the vegetative form, leading to more than two times increasein cell number output rate. When the vegetative cells were transferred tophotoautotrophic phase, there was a sharp decrease in the cell number andonly very few cells encysted and accumulated astaxanthin. On the otherhand, when the shift from heterotrophic to photoautotrophic condition wasdone when most of the cells had encysted, there was still a decrease in cellnumber but astaxanthin accumulation was very high. The astaxanthinconcentration (114 mg L-1) and productivity (4.4 mg L-1d-1) obtained by this sequential heterotrophic-photoautotrophiccultivation method are very high compared to the data in the literature.
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Hata, N., Ogbonna, J.C., Hasegawa, Y. et al. Production of astaxanthin by Haematococcus pluvialis in a sequential heterotrophic-photoautotrophic culture. Journal of Applied Phycology 13, 395–402 (2001). https://doi.org/10.1023/A:1011921329568
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DOI: https://doi.org/10.1023/A:1011921329568