. 2018 May 15;59:14. doi: 10.1186/s40529-018-0230-1

Table 2.

Antioxidant activity of Baizhi taproot and lateral root at three growth stages

Harvest stage	Taproot	Lateral root
DPPH radical scavenging capacity
V-stage	5.70 ± 4.54^a*	5.07 ± 5.20^a
B-stage	6.46 ± 3.06^a	6.76 ± 5.37^a
S-stage	10.92 ± 3.82^b	6.12 ± 5.12^a
Fe²⁺ chelating capacity
V-stage	2.52 ± 7.13^a	2.55 ± 6.13^a
B-stage	1.66 ± 1.70^a	1.90 ± 1.74^a
S-stage	11.94 ± 6.09^b	2.65 ± 6.33^a

Roots were extracted with methanol and subjected to DPPH and Fe²⁺ chelating assay. Activity of extracts is shown as mean ± SD IC50 (mg/ml) predicted by Loess regression

* Different letters indicate statistical significance (p < 0.05) by t test