Growth factors arrangement enhances Thermosynechococcus sp. CL-1 carotenoid productivity during CO2 fixation

Li, Tzy Ying; Winayu, Birgitta Narindri Rara; Hsueh, Hsin Ta; Chu, Hsin

doi:10.1016/j.fbp.2020.09.010

Cited by 10 publications

(3 citation statements)

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“…A higher [NaCl] did not trigger a response in terms of carotenoid productivity, as would be expected from studies elsewhere [ 30 , 31 ]. The authors of those studies observed the up-regulation/production of carotenoid protective pigments (i.e., β-carotene and zeaxanthin) when high salinities were attained.…”

Section: Discussionsupporting

confidence: 74%

“…However, the results suggest that this strain can adapt to high [NaCl] because the cultures did not collapse. High concentrations of Na + and Cl - in the medium have been claimed to destabilize ion cell homeostasis and consequently lead to osmotic stress, with severe repercussions regarding growth and biomass accumulation [ 30 , 31 ]. For instance, Thermosynechococcus sp.…”

Section: Discussionmentioning

confidence: 99%

“…For instance, Thermosynechococcus sp. CL-1 used in a CO 2 fixation process and subjected to [NaCl] of 8, 18, and 29 g·L −1 , decreased its biomass productivities from 90.31 to 49.58 and 6.46 mg·L −1 ·h −1 , respectively [ 30 ]. This was a consequence of a decrease in photosynthetic efficiency (i.e., the inhibition of the electron transport chain) but also the redirection of energy for the active pumping of Na + ions and the production of carbohydrates as salt protectors to counterbalance the cell stress [ 32 ].…”

Section: Discussionmentioning

confidence: 99%

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Effects of Temperature, pH, and NaCl Concentration on Biomass and Bioactive Compound Production by Synechocystis salina

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Tavares

et al. 2023

Life

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Synechocystis salina is a cyanobacterium that has biotechnological potential thanks to its ability to synthesize several bioactive compounds of interest. Therefore, this study aimed to find optimal conditions, in terms of temperature (15–25 °C), pH (6.5–9.5), and NaCl concentration (10–40 g·L−1), using as objective functions the productivities of biomass, total carotenoids, total PBPs, phycocyanin (PC), allophycocyanin (APC), phycoerythrin (PE), and antioxidants (AOXs) capacity of Synechocystis salina (S. salina) strain LEGE 06155, based in factorial design resorting to Box-Behnken. The model predicted higher biomass productivities under a temperature of 25 °C, a pH of 7.5, and low NaCl concentrations (10 g·L−1). Maximum productivities in terms of bioactive compounds were attained at lower NaCl concentrations (10 g·L−1) (except for PE), with the best temperature and pH in terms of carotenoids and total and individual PBPs ranging from 23–25 °C to 7.5–9.5, respectively. PE was the only pigment for which the best productivity was reached at a lower temperature (15 °C) and pH (6.5) and a higher concentration of NaCl (≈25 g·L−1). AOX productivities, determined in both ethanolic and aqueous extracts, were positively influenced by lower temperatures (15–19 °C) and higher salinities (≈15–25 g·L−1). However, ethanolic AOXs were better recovered at a higher pH (pH ≈ 9.5), while aqueous AOXs were favored by a pH of 8. The model showed that biomass production can be enhanced by 175% (compared to non-optimized conditions), total carotenoids by 91%, PC by 13%, APC by 50%, PE by 130%, and total PBPs by 39%; for AOX productivities, only water extracts exhibited a (marginal) improvement of 1.4%. This study provided insightful information for the eventual upgrading of Synechocystis salina biomass in the biotechnological market.

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Section: Discussionsupporting

confidence: 74%

Section: Discussionmentioning

confidence: 99%