Magnetic field as promoter of growth in outdoor and indoor assays of Chlorella fusca

This study aimed to evaluate the influence of a magnetic field (MF) intensity of 25 mT on Chlorella fusca cultivation in outdoor and indoor conditions, and evaluate the changes in the macromolecules, pigment content and protein profile. C. fusca was cultivated for 15 d in raceway photobioreactor. MF was applied for 24 h d(-1) and 1 h d(-1). In outdoor cultivation, MF applied for 24 h d(-1) increased 23% in the biomass concentration, while indoor assays resulted in an increase in both modes, with biomass production increasing between 70 and 85%. Biomass composition was altered when MF was applied for 1 h d(-1) in indoor assays; the highest protein content was achieved (32.7%). Nitrate consumption was higher in outdoor assays, while MF application did not alter the protein profile. The results showed that combining the outdoor conditions with MF is advantageous, as higher biomass concentration can be achieved with lower energy expenditure.

Automated summary

This study found that combining a magnetic field with outdoor conditions can increase the biomass concentration of Chlorella fusca while reducing energy consumption. The magnetic field has an impact on the biomass and protein content of C. fusca, especially with the application of 1 hour of magnetic field in indoor conditions yielding the most significant results.