Antioxidant Activities and Phytochemicals of Leaf Extracts from 10 Native Rhododendron Species in Taiwan

Table 2

Correlation coefficients among DPPH radical scavenging activity (DPPH assay), superoxide radical scavenging activity (NBT assay), ferrous ion chelating ability (Chelating assay), reducing power assay (Reducing power), and total phenolic contents (TPC) in extracts.

	DPPH assay	NBT assay	Chelating assay	Reducing power	TPC
DPPH assay	—	0.103	0.004	0.752*	0.787*
NBT assay	0.103	—	0.711*	0.577	0.581
Chelating assay	0.004	0.711*	—	0.424	0.480
Reducing power	0.752*	0.577	0.424	—	0.966**
TPC	0.787**	0.581	0.480	0.966**	—

∗P < 0.05; ∗∗P < 0.01.