Cytoprotective Effect of Ligustrum robustum Polyphenol Extract against Hydrogen Peroxide-Induced Oxidative Stress via Nrf2 Signaling Pathway in Caco-2 Cells

Table 2

Total polyphenolic contents and antioxidant capacities of various extracts of Ligustrum robustum.

	Total phenol contents	ABTS	ORAC	DPPH	FRAP
	mg CAE/g dried leaves	mmol Trolox/g	μmol Trolox/g	mmol Trolox/g	mmol/g
Chloroform	1.20±0.01	0.0088±0.0002	8.50±0.70	0.0010±0.0001	0.0074±0.0008
Ethyl acetate	29.77±0.11	0.2342±0.0153	236.40±31.63	0.0806±0.0029	0.1865±0.0224
n-butanol	75.70±0.29	0.4496±0.0104	420.75±49.42	0.2634±0.0052	0.5102±0.0408
Water	9.78±0.06	0.0662±0.0029	40.42±3.93	0.0276±0.0006	0.0684±0.0055

The values reported are mean ± SD. CAE: chlorogenic acid (a: different from n-butanol fraction, b: different from ethyl acetate fraction, c: different from remaining water fraction, p<0.05).