Figure 4

Changes in formaldehyde levels in culture medium and cell viability in the presence of geniposide. Decreases in formaldehyde concentrations in the medium of cells treated with geniposide (100 μM and 25 μM) for 24 h were detected by HPLC when compared with the formaldehyde-only group (control; A). Changes in SH-SY5Y cell viability in the presence of TLJN, geniposide, or ginsenoside Rg1 at different concentrations (250 μM, 100 μM and 25 μM; B). Data are expressed as the mean ± SD from at least three independent experiments. *P < 0.05, **P < 0.01 vs. the group treated with formaldehyde alone.