Effect of Photoperiod and White LED on Biomass Growth and Protein Production by Spirulina.

The constant increase in demand for food, valued bio-based compounds and energy demand has prompted the development of innovative and sustainable resources. New technologies and strategies must be implemented to boost microalgae biomass production, such as using different photoperiods along with (LED) light-emitting diodes to stimulate biomass production and boost profits. This work investigates the cultivation of blue-green microalgae (Spirulina) in a closed lab condition. The current study aims to boost Spirulina biomass production by creating ideal growth conditions using different photoperiods (12:12; 10:14; 14:10) light/dark with a constant light intensity of 2000 lx from White LED lights. The obtained optical density and protein content was highest for photoperiod 14L: 10D and values were 0.280 OD, with a protein content of 23.44 g/100 g, respectively. This study is a crucial first step in identifying the best photoperiod conditions to help S. platensis produce more biomass. The study results showed that increasing photoperiod for S. platensis farming can improve the quality and amount of biomass generated in those cultures without negatively affecting growth.