4.5 Article

Magnetic fields exhibit a positive impact on lipid and biomass yield during phototrophic cultivation of Spirulina sp.

期刊

BIOPROCESS AND BIOSYSTEMS ENGINEERING
卷 44, 期 10, 页码 2087-2097

出版社

SPRINGER
DOI: 10.1007/s00449-021-02585-9

关键词

Ferrite magnets; Cyanobacteria; Solenoid; Microalgae biomass

资金

  1. Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior-Brasil (CAPES) [001]
  2. Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq, Brazil) [485575/2013-2]

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This study found that the effects on the metabolism of Spirulina sp. are directly related to the photosynthesis cycle and time period in which the magnetic field (MF) was applied. The lipid concentration increased in all conditions and important changes were observed in the protein profile.
This study aimed to investigate the effects of magnetic field (MF) application (1, 12 and 24 h day( -1)) to Spirulina sp. LEB 18 in different photosynthesis cycles (dark and/or light) during short (15 days) and long periods (50 days) of cultivation. MF application was performed via two sources: ferrite magnets and solenoids. At the end of cultivation, the biomass was characterized in terms of lipids, proteins, and carbohydrates. In the 15 day cultures, the highest maximum biomass concentrations (2.06 g L-1 and 1.83 g L-1) were observed when 30 mT was applied for 24 h day( -1) or 12 h day( -1) (on the light cycle), respectively. MF application throughout cultivation (24 h day( -1)) for more than 30 days is not recommended. In all conditions, there was an increase in the lipid concentration (from 14 to 45%). The protein profile suggested important changes in photosystems I and II due to MF application. Cell morphology was not altered by MF application. In conclusion, the effects on the metabolism of Spirulina sp. are directly related to the photosynthesis cycle and time period in which the MF was applied.

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