Figure 2.
Effects of UV-B on the non-enzymatic antioxidants. (A) Total antioxidant capacity (TAC) and (B) phenolic compounds were determined in control (bars in white) and UV-B treated (bars in black) microalgal strains (F4, LG1, PEC, and ETI). UV-B exposure level was set at 1.7 W m−2 supplemented with 70 μmol m−2 s−1 photosynthetically active radiation (PAR) following a time course from 0 to 18 h. Control microalgal group only received PAR. Asterisks represent significant differences (* p < 0.05) between control and UV-B treatment within the same strain at a specific time point. Data are expressed as means of 3 different replicates ± standard deviation (SD). nd: not detectable. F4 and LG1: Chlorella sorokiniana strains; PEC: Pectinodesmus pectinatus strain; ETI: Ettlia pseudoalveolaris strain.