Research Article

Antioxidant Activities of Stilbenoids from Rheum emodi Wall

Table 2

Antioxidant activities of different compounds expressed as IC50 values (μmol/L) from in vitro assays of DPPH (I) and superoxide anion (II) scavenging and lipid peroxidation inhibition (III).

PICEPICGRESPODVcEDA

I138.9149.8167.277.562.6
II124.6305.2438.318.97
III31.2837.7072.89166.429.65

— indicated that the activity was rather weak and therefore IC50 value could not be calculated.