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

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

Phytochemicals	Content (mg/g of EtOAc fraction)	IC₅₀ (μM)
Phytochemicals	Content (mg/g of EtOAc fraction)	DPPH radical scavenging	Superoxide radical scavenging
(2R, 3R)-Epicatechin (1)	15.0 ± 0.3	8.4 ± 0.2^a	34.1 ± 1.3^a
(2R, 3R)-Taxifolin (2)	27.0 ± 0.4	7.6 ± 0.2^abc	17.9 ± 1.0^b
(2R, 3R)-Astilbin (3)	130.8 ± 10.9	8.2 ± 0.5^ab	33.2 ± 1.7^a
Hyperoside (4)	105.5 ± 8.5	6.8 ± 0.4^c	16.1 ± 0.3^bc
Guaijaverin (5)	104.1 ± 4.7	7.4 ± 0.1^bc	15.8 ± 0.4^bc
Quercitrin (6)	108.6 ± 4.0	6.9 ± 0.2^c	13.0 ± 0.9^c

Different letters within a column indicate significant difference at the P < 0.05 level according to Scheffe’s test

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