Abstract
Natural-based chemicals from microalgae such as lipids and pigments are the interests in industries and the bioeconomy. Cold-adapted Ankistrodesmus sp. OR119838, an isolated strain from Cheshmeh–Sabz Lake in northeastern Iran, was cultivated using a two-stage culture strategy under different environmental conditions. With doubling the nitrate concentration at the vegetative stage (170 mg/L) and increasing the light intensity (180 µmol photons/m2/s) the highest specific growth rate (0.61 ± 0.02 per day) and biomass productivity (121.1 ± 7.2 mg/L/day) were observed at 25 °C. In the optimal growth condition Chl a and Chl b contents of Ankistrodesmus sp. OR119838 reached the highest amount (11.07 ± 0.14 and 11.23 ± 0.29 µg/mL, respectively) at 25 °C. While carotenoid content correlated negatively with optimum biomass productivity (− 0.708) and had the best value (12.23 ± 0.29 µg/mL) in nitrogen deficiency (42 mg/L) and intense light conditions (180 µmol photons/m2/s) at 15 °C. Lipid content was increased with declined nitrate concentration (42 mg/L), high light intensity, and 180 µmol photons/m2/s at 25 °C. The highest percentage of polyunsaturated fatty acids (71.94%) and α-linolenic acid (57.73 ± 6.63%) was observed in conditions with 170 mg/L nitrate concentration and low light intensity (40 µmol photons/m2/ s) at the low temperature (15 °C). While saturated fatty acids content (43.27%) and palmitic acid reached the highest amount under 40 µmol photons/m2/s, 42 mg/L nitrate at 25 °C (35.02 ± 5.33%). Biomass productivity of Ankistrodesmus sp. OR119838, as a cold-adapted strain, decreased by only 8.2% with a 10-degree decline in temperature. Therefore, this strain has good potential to grow in open ponds by tolerating the daily temperature fluctuations.
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The datasets generated during the current study are available from the corresponding authors upon request.
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Acknowledgements
We would like to thank prof.dr.ir. RH (Rene) Wijffels and prof.dr. MJ (Maria) Barbosa from Wageningen University, Netherlands, for using their fluorescence-activated cell sorting to isolate and purify strains.
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Financial support was provided by Ferdowsi University of Mashhad (grant no. 3/45727).
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AR: conceptualization, methodology, investigation, formal analysis, writing-original draft. MC: supervision, conceptualization, resources, writing-review & editing. HA: supervision, conceptualization, resources, writing-review & editing. JV: methodology, writing-review.
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Rezaei, A., Cheniany, M., Ahmadzadeh, H. et al. A new isolate cold-adapted Ankistrodesmus sp. OR119838: influence of light, temperature, and nitrogen concentration on growth characteristics and biochemical composition using the two-stage cultivation strategy. Bioprocess Biosyst Eng 47, 341–353 (2024). https://doi.org/10.1007/s00449-023-02964-4
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DOI: https://doi.org/10.1007/s00449-023-02964-4