The effect of immobilization technique and salinity (sodium chloride) stress on growth indices, carotenoid and carbohydrate accumulation in microalga Dunaliella salina

Document Type : Research Paper

Authors

1 Assistant Professor in Department of Biological Science, Faculty of Science, University of Kurdistan, Sanandaj, Iran

2 M.Sc. in Biochemistry, Department of Biological Science, Faculty of Science, University of Kurdistan, Sanandaj, Iran

10.22124/japb.2024.25973.1520

Abstract

Microalgae are used to produce valuable natural compounds. Low yield and high cost limit the commercial potential of microalgae. Recently, the techniques of immobilization and increasing production efficiency have been noticed. In the present study, the effect of salt concentration, stabilization and growth period on growth, biomass, carbohydrate, carotenoid, chlorophyll a and b in Dunaliella salina was evaluated. The results showed that the growth of microalgae in free conditions was more than in stabilization condition. At salinity of 150 and 300g/L algae growth was significantly reduced. The maximum biomass was measured at 75g/L salinity and free condition. Carotenoid in salinity of 75g/L and unstabilized condition was more than other treatments. Carbohydrate in salinity of 30g/L was significantly higher than other treatments. In the concentration of 150g/L, carbohydrate was significantly higher in stabilization condition. It seems that the composition of the substrate as well as the method of application of stabilization is an effective factor. Salt stress is a simple method to induce carotenoid synthesis. Research in the field of optimization of the material used as well as the method of applying stabilization to increase the production efficiency of valuable compounds seems necessary.

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