Impact of Stress-Induced Shocks on Carotenoids and Phenolics Production from Chlorella vulgaris and Anabaena torulosa | ||||
| Egyptian Journal of Aquatic Biology and Fisheries | ||||
| Article 124, Volume 29, Issue 2, March and April 2025, Page 1823-1847 PDF (673.47 K) | ||||
| DOI: 10.21608/ejabf.2025.421340 | ||||
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| Author | ||||
| Sadek et al. | ||||
| Abstract | ||||
| Chlorella vulgaris and Anabeana torulosa are microalgae containing many valuable bioactive compounds. This study aimed to investigate the impact of novel strategy by applying stress-induced shocks on the biomass and biological activities of the growing microalgae. The effects of stress-induced shocks at high light intensities, high and low temperatures, high salinities, excision and depletion of nitrate, and gamma radiation on biomass, extracts, carotenoids, and phenolics production of the two studied microalgae in relation to their antioxidant activity percentage (A.O%) were tested. Methanol extracts of C. vulgaris and A. torulosa grown on BG-11 were tested by using Fourier-transform infrared spectroscopy and gas chromatography mass spectrophotometer. The chosen optimal stress parameters were illumination shocks at 350μmol photons m−2 s−1 for 20min, temperature at 43oC for 6h, and 0.5g/ L nitrate concentration for 6 days of incubation. Additionally, 100mM salinity concentration and 1kGy of gamma radiation dose for A. torulosa, while, 150mM and 1.5 kGy for C. vulgaris. 136.0 and 138.3mg/ g of total phenolics and 141.7 and 134.7mg/ g of total carotenoids for C. vulgaris and A. torulosa, respectively. The percentages of antioxidant activity produced by C. vulgaris and A. torulosa were 95.7 and 94.3%, respectively, recording the highest antioxidant activity percentage. Employing of abiotic stress-induced shocks on C. vulgaris and A. torulosa is considered as a promising economic technique for the production of carotenoids and phenolics. The produced carotenoids and phenolics from the studied algae were a protective agent in overcoming stress conditions and are therefore considered as powerful antioxidant and radioprotective agents. | ||||
| Keywords | ||||
| Antioxidant activity; Phenolics; Carotenoids; Chlorella vulgaris; Anabaena torulosa; Gamma radiation | ||||
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