Influence of blue and yellow light-emitting diodes on the lipid and carbohydrate composition of Isochrysis galbana

The marine microalgae, Isochrysis galbana is of fundamental importance to the aquaculture industry. In this study, I. galbana was cultured under blue, yellow LED and fluorescent light for 13 days, and the morphology, growth and proximate composition (protein, lipid and carbohydrate) were compared. Isochrysis galbana cultured under fluorescent light (8.19 x 10(6) cells ml(-1)) had higher cell density compared to blue LED (4.75 x 10(6) cells ml(-1)). The specific growth rate for fluorescent light (0.28 day(-1)) was higher compared to yellow (0.21 day(-1)) and blue LED (0.20 day(-1)) cultures. Lipid content was higher in I. galbana grown under yellow LED (27.94%, 0.19 g dry cell weight, DCW/L) compared to fluorescent light (23.01%, 0.15 g DCW/L). Whereas carbohydrate content was higher when grown under fluorescent light (7.99%, 0.05 g DCW/L) compared to blue LED (5.32%, 0.03 g DCW/L). The use of different colour LED can be used to enhance the proximate composition of microalgae.

Automated summary

The marine microalgae Isochrysis galbana cultured under different light conditions showed variations in cell density and proximate composition, with higher growth rate under fluorescent light and higher lipid content under yellow LED.