Effects of microelements (Fe, Cu, Zn) on growth and pigment contents of Arthrospira (Spirulina) platensis

摘要

A laboratory experiment was conducted to assess the bioaccumulation of microelements Fe sup2+/sup, Cu sup2+/sup, Zn sup2+/sup and their effects on the growth and pigment contents of Spirulina platensis in Zarrouk’s media. The mentioned metals concentrations enhanced separately to tenfold of the Zarrouk’s content. The results indicated no differences in the dry weights for the different medias ( p 0.05). A rapid increase in optical density values has been observed in tenfold of Cusup+2/sup concentration giving the maximum optical density values (0.498± 0.234 mg Lsup-1/sup). In contrast, a gradual increase rate in the optical density has been observed at all concentration of treatments. Enrichment factor (EF) improved with increasing the metal concentration of treatments. The maximum EF value has been observed at 13.54 in Znsup+2/sup concentrations. At all concentrations, the maximum production of chlorophyll A (1.213±0.514 mg Lsup-1/sup) occurred in 7supth/sup day of incubation. The highest total carotenoid concentration was recorded in S . platensis treated with Cusup+2/sup (0.0042± 0.0004 mg Lsup-1/sup) after 14 days. The phycobiliproteins decreased in all of the treatments. Results suggested that S. platensis would be important part of in functional food developments.