Influence of led red-light intensity on phycocyanin accumulation in the cyanobacterium Nostoc commune Vaucher

Abstract

Nostoc commune Vaucher, which was isolated from Maetang District, Chiangmai Province, Thailand. The algae was cultivated in laboratory under different red light LED (LD) intensity of, 10, 20, 30, 100 and 120 μmol m^-2 s^-1. The medium using BG 11 modified without N source. Results Biomass as fresh weight and dry weight, %Dry weights, protein, and Phycocyanin contents were fluctuation in difference light intensity. The highest biomass as fresh weight have shown in LD 30 with the value of 9.24 g.L^-1 and the lowest was at LD10 with the value of 2.56 g.L^-1 and as dry weight was maximum at LD120 with 0.21 g.L^-1 and minimum was 0.07 g.L^-1 at LD10. %Dry weights was found the maximum value at LD120 with 3.51% and lowest at LD 30 with the value of 1.8%. Protein content have shown the highest value at LD30 with 1.8%. Protein was high present at LD10 with the value of 1.00+0.12 mg.L^-1 and low value at LD100 with 0.79+0.09 mg.L^-1. The Red light intensity of 30 μmol m^-2 s^-1 was resulted in phycocyanin higher values than other intensities with the value of 0.32+0.09 mg.L^-1 and lowest concentration at LD120 with the value of 0.17+0.01 mg.L^-1. Conclusion LED Red light at 30 μmol m^-2 s^-1 were optimal for phycocyanin accumulation in Nostoc commune Vaucher.

Keywords: Light intensity, Phycocyanin, Nostoc commune Vaucher