Impact of heavy metal pollution on growth, biochemical composition and nutrition quality of Spirulina platensis

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Abstract This study focused on the effect of five different concentrations of three heavy metals (Nickel, Copper and Zinc) on growth, IR spectra, the content of fatty acids and total soluble protein profile in Spirulina platensis. Spirulina platensis was selected for this study because of its high nutritional value as an important form of algae that is used commercially (especially for fish feeding) as a source of proteins, minerals, amino acids, vital unsaturated fatty acids, and a range of vitamins. EC50 of the three heavy metals was recorded nearly at concentration 2.0 mg/l. The inhibitory effect of growth measured in optical density was more prominent in case of copper than zinc and nickel. IR spectra showed formation of new compounds and absence of other compounds when compared to untreated cells, it was clearer in case of Cu2+ than in case of Zn2+ and Ni2. Grand total fatty acids decreased under all the tested concentrations, saturated fatty acids were more dominant than unsaturated ones under stress conditions. The destructive effect of the heavy metal ions on protein profile was more prominent under the stress effect of Cu2+ than in case of Zn2+ and Ni2+.

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