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Table 1 Antioxidant activities and contents of major phytochemicals of the EtOAc fraction from R. oldhamii leaves

From: Antioxidative phytochemicals from Rhododendron oldhamii Maxim. leaf extracts reduce serum uric acid levels in potassium oxonate-induced hyperuricemic mice

Phytochemicals Content (mg/g of EtOAc fraction) IC50 (μM)
DPPH radical scavenging Superoxide radical scavenging
(2R, 3R)-Epicatechin (1) 15.0 ± 0.3 8.4 ± 0.2a 34.1 ± 1.3a
(2R, 3R)-Taxifolin (2) 27.0 ± 0.4 7.6 ± 0.2abc 17.9 ± 1.0b
(2R, 3R)-Astilbin (3) 130.8 ± 10.9 8.2 ± 0.5ab 33.2 ± 1.7a
Hyperoside (4) 105.5 ± 8.5 6.8 ± 0.4c 16.1 ± 0.3bc
Guaijaverin (5) 104.1 ± 4.7 7.4 ± 0.1bc 15.8 ± 0.4bc
Quercitrin (6) 108.6 ± 4.0 6.9 ± 0.2c 13.0 ± 0.9c
  1. Different letters within a column indicate significant difference at the P < 0.05 level according to Scheffe’s test