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Effects of C. petasites extracts and its active compounds on A549 lung cell viability. Cells were treated with CpEE (A), CpDM (B), CpEA (C), Cp-H2O (D), hesperidin (E), hesperetin (F) and hispidulin (G) for 24 and 48 h. Cell survival was determined using SRB assay. Data are presented as mean ± S.D. values of three independent experiments. * p < 0.05, ** p < 0.01 and *** p < 0.001 vs. control.
