Authors
1
Food and Drug Research Center, Food and Drug Administration, Ministry of Health and Medical Education, Tehran, Iran
2
Mohammad Javad Hessami, Department of Biotechnology, Faculty of Applied Sciences, UCSI University 56000 Cheras, KL, Malaysia
3
Faculty of Marine Sciences, Department of Marine Biology, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran
4
Iranian Fisheries Science Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
10.22092/ijfs.2025.134844
Abstract
This study aimed to optimise the growth conditions of Arthrospira platensis by modifying the ionic composition of the standard Zarrouk medium using a seawater-based medium (MK1B). The optimisation process involved three stages: adjusting the ionic composition, optimizing iron concentration, and comparing different iron sources. The final mass concentrations for the control, G1, and G2 were 1.25, 1.1, and 1.15 g. L-1, respectively, with no significant differences (p>0.05). The specific growth rate of the control group was significantly higher than G2 and G1. Carbohydrate content was higher in G1 and G2 compared to the control, while the protein content was lower in G1 and G2 compared to the control. In the semi-industrial phase, A. platensis cultivated in MK1B medium showed a productivity of 27.066 mg. L-1 per day and a total biomass of 0.862 g. L-1 after 30 days. The average chlorophyll content was 7.82 mg. g-1, beta-carotene 1.9 mg. g-1, protein 57.96%, lipid 9.35%, and carbohydrate 26.52%. The microbial load of A. platensis in MK1B medium met USP43 and ISIRI11166 safety standards, confirming its suitability for food and pigment applications. Finally, using seawater for the sustainable production of Spirulina microalgae, with potential applications in food supplements and natural pigment resources is feasible.
Keywords
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