Fig. 2

Antioxidant activities of Baizhi root extracts from different growth stages. Baizhi roots were extracted with methanol, and extracts were diluted or concentrated to at least seven concentrations, and subjected to DPPH assay of taproot (a) and lateral root (b) and Fe²⁺ chelating assay of taproot (c) and lateral root (d). The gray-line zones indicate 95% confidence intervals for the loess regression line derived from ten plant samples for each concentration