# Static Magnetic Fields Effects on Polysaccharides Production by Different Microsalgae Strains
## 4 Conclusions  
SMF increased the biomass productivities besides the starch content in _Chlorella_ biomass; probably the glycogen content in _Spirulina_ biomass and modifying EPS composition. Outdoor cultures of _C. fusca_ showed 30% more starch than indoor assays, besides,  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Monosaccharides (\%** & \multicolumn{2}{c}{_Arthrospira Platensis_ **SAG 21.99**} & \multicolumn{2}{c}{_Spirulina_ **sp. LEB 18**} \\
**Molar Ratio**) & & & & & & \\ \hline  & **Control** & **SMF 24 h d\({}^{-1}\)** & **SMF 1 h d\({}^{-1}\)** & **Control** & **SMF 24 h d\({}^{-1}\)** & **SMF 1 h d\({}^{-1}\)** \\ \hline Fucose & 5.8 \(\pm\) 0.01 & 10.2 \(\pm\) 0.01 & 7.0 \(\pm\) 0.01 & 13.34 \(\pm\) 0.01 & 13.5 \(\pm\) 0.02 & 15.30 \(\pm\) 0.01 \\ Arabinose & 1.7 \(\pm\) 0.01 & - & - & 1.77 \(\pm\) 0.01 & 2.28 \(\pm\) 0.01 & 1.43 \(\pm\) 0.01 \\ Rhamnose & - & 4.8 \(\pm\) 0.02 & 4.5 \(\pm\) 0.02 & 9.77 \(\pm\) 0.01 & 6.59 \(\pm\) 0.01 & 4.33 \(\pm\) 0.01 \\ Galactose & 7.2 \(\pm\) 0.01 & 16.9 \(\pm\) 0.01 & 15.5 \(\pm\) 0.04 & 18.99 \(\pm\) 0.01 & 21.05 \(\pm\) 0.02 & 20.42 \(\pm\) 0.01 \\ Glucose & 71.8 \(\pm\) 0.01 & 52.4 \(\pm\) 0.01 & 57.2 \(\pm\) 0.04 & 19.66 \(\pm\) 0.01 & 23.35 \(\pm\) 0.02 & 24.51 \(\pm\) 0.03 \\ Xylose & 9.9 \(\pm\) 0.01 & 7.8 \(\pm\) 0.02 & 6.2 \(\pm\) 0.01 & 17.37 \(\pm\) 0.01 & 17.62 \(\pm\) 0.04 & 16.78 \(\pm\) 0.02 \\ Glucuronic acid & 3.6 \(\pm\) 0.01 & 8.1 \(\pm\) 0.01 & 6.50 \(\pm\) 0.02 & 13.45 \(\pm\) 0.01 & 14.30 \(\pm\) 0.01 & 15.48 \(\pm\) 0.01 \\ Galacturonic acid & - & - & - & 4.18 \(\pm\) 0.01 & - & - \\ \hline \hline \end{tabular}
\end{table}
Table 3: Monosaccharide composition of EPS from cyanobacteria strains cultivated under different conditions of SMF application.  
when SMF was applied for 1 h d\({}^{-1}\), starch content was higher than control. Regarding uronic acids in the EPS of cyanobacteria, the SMF action significantly increased the content (\(p\leq 0.05\)) in both conditions. For cyanobacteria, SMF application did not significantly modify the EPS amounts, while the increase in total carbohydrate content was already observed suggesting that the SMF action is on the intracellular polysaccharide fraction. However, a modification in the EPS composition was highlighted, that may improve biological activities of EPS. Indeed, the SMF applied for 24 d\({}^{-1}\) and 1 h d\({}^{-1}\) induced an increase in some monosaccharides content such as fucose, rhamn, and glucuronic acid that are suggested to be relied to these activities. This study showed that SMF may alter the composition and concentration of carbohydrate and microalgae metabolism.  
Conceptualization, K.M.D. and C.L.; funding acquisition, J.A.V.C. and C.L.; investigation, K.M.D. and C.G.; methodology, K.M.D.; supervision, J.A.V.C., K.M. and C.L.; validation, C.L.; writing--original draft, K.M.D.; writing--review and editing, K.M.D., M.G.d.M., L.O.S. and C.L. All authors have read and agreed to the published version of the manuscript.  
This research was funded by the Coordination for the Improvement of Higher Education Personnel--Brazil (CAPES), Program CAPES-COFECUB (Sv 945/19) and Ministry of Science, Technology, Innovations and Communication (MCTIC). This study was financed in part by the Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior--Brasil (CAPES)--Finance Code 001.  
Not applicable.  
The authors declare no conflict of interest.