Fig. 4

The differences of DL properties between authentic and sulfur fumigation herbal materials. a1 Angelicae sinensis radix (whole materials); a2 Angelicae sinensis radix (sulphur fumigation sample, whole materials); a3 DL decay curves. Data are plotted as the mean ± SEM. Note that the data are plotted on a log–log scale; a4 Histograms comparing the DL properties between Angelicae sinensis radix and its sulphur fumigation sample. Mean ± SD, *p < 0.05; b1 Dioscoreae rhizoma (sliced materials); b2 Dioscoreae rhizoma (sulphur fumigation sample, sliced materials); b3 DL decay curves. Data are plotted as the mean ± SEM. Note that the data are plotted on a log–log scale; b4 Histograms comparing the DL properties between Dioscoreae rhizoma and its sulphur fumigation sample. Mean ± SD, *p < 0.05; c1 Gastrodiae rhizoma (whole materials); c2 Gastrodiae rhizoma (sulphur fumigation sample, whole materials); c3 DL decay curves. Data are plotted as the mean ± SEM. Note that the data are plotted on a log–log scale; c4 Histograms comparing the DL properties between Gastrodiae rhizoma and its sulphur fumigation sample. Mean ± SD, *p < 0.05