Antioxidant Activities and Phytochemical Study of Leaf Extracts from 18 Indigenous Tree Species in Taiwan

Table 4

Antioxidant activities and contents of major phytochemicals from the A. oliverianum leaves.

Phytochemicals	Contents (mg/g of methanolic extract)	Free radical scavenging activity (IC50, μM)
		DPPH radical	Superoxide radical
1	2.75±0.08^C	8.2±0.2^CD	16.2±1.3^B
2	0.41±0.01^E	8.6±0.2^C	>50
3	3.42±0.08^A	3.0±0.1^F	10.3±1.0^C
4	3.37±0.05^A	2.8±0.1^F	6.5±0.4^D
5	3.55±0.04^A	5.9±0.1^E	8.6±0.2^CD
6	2.64±0.05^C	11.6±0.4^B	17.4±0.3^B
7	2.95±0.05^B	19.6±0.7^A	18.1±0.7^B
8	0.73±0.06^D	>50	>50
(+)-Catechin	—	7.7±0.1^D	47.1±0.4^A

Results are mean ± SD (𝑛=3). Different capital letters in superscript indicate significant differences among groups (𝑃<0.05).