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

Table 3

Antioxidant activities of methanolic extracts and their derived soluble fractions from the leaves of R. pseudochrysanthum.

Extracts	IC50 (µg/mL)
	DPPH radical scavenging	Superoxide radical scavenging	Ferrous ion; chelating
Crude extract	7.5 ± 0.7^BC	12.4 ± 0.8^C	1344.4 ± 18.5^B
Hexane fraction	71.7 ± 7.4^A	>100	>2000
EtOAc fraction	3.7 ± 0.2^C	14.2 ± 1.4^BC	1907.8 ± 212.5^A
BuOH fraction	3.3 ± 0.2^C	7.4 ± 0.6^D	>2000
Water fraction	15.4 ± 0.2^B	19.3 ± 1.5^A	281.7 ± 18.5^C
(+)-Catechin	2.1 ± 0.3^C	16.6 ± 0.9^AB	>2000

The results are presented as means ± SD (n = 3). Different letters within a column indicate significant difference at the P < 0.05 level according to Scheffe’s test.