Effect of different cobalt concentrations on growth, biochemical composition and fatty acids profile of microalgae Isochrysis galbana

Document Type : Research Paper

Authors

1 Ph.D. Student in Fisheries, Department of Fisheries Science, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 Associate Professor in Department of Fisheries Science, Science and Research Branch, Islamic Azad University, Tehran, Iran

3 Professor in Department of Aquatic Health and Diseases, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran

4 Professor in Department of Fisheries, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

Abstract

Manipulation in the concentration of the nutrients of microalgae is one of the effective strategies to improve biomass and nutritional value. In this study, the effect of different concentrations of cobalt (0.001, 0.01 (control), 0.1, 1 and 10mg/L) on cell density, chlorophyll a and b, lipid, fatty acid profile, iodine and soap numbers of Isochrysis galbana were studied for two weeks. Adding 0.001 mg/L cobalt significantly improved chlorophyll a (3.2118mg/L) and b (2.001mg/L) and lipid (24.09%) and protein (53.91%) content of I. galbana compared to other treatments (P<0.05). The highest level of saturated fatty acid (47.83%) was observed in 10mg/L cobalt treatment, while the reduction of cobalt to 0.001mg/L caused an increase in monounsaturated fatty acid (MUFA) and polyunsaturated fatty acids (PUFA). Also, the maximum and minimum iodine and soap numbers were observed at concentrations of 0.001 and 10mg/L cobalt, respectively. Overall, a concentration of 0.001 mg/L cobalt provided the nutritional value of this microalgae in terms of chlorophyll a and b, protein, lipid and PUFA, although an alteration in the optimal concentration had a negative effect on biomass.

Keywords

References

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Aquatic Physiology and Biotechnology
Volume 9, Issue 1
June 2021
Pages 97-123

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