Table 5. Total polyphenol contents and DPPH radical scavenging activity of water and ethanol extracts of plants.

Natural extracts	Total polyphenol contents (%)			DPPH radical scavenging activity [(IC50) mg/mL]
	Ethanol extraction	Hot water extraction	t-value	Ethanol extraction	Hot water extraction	t-value
Schisandra chinensis (Turcz.) Baill. (4)	1.44±0.03e	0.45±0.01f	0.000**	1.62±0.03b	14.03±1.79a	0.066
Ecklonia cava (23)	10.53±0.08c	3.61±0.05c	0.000**	2.73±0.54a	4.49±1.00b	0.116
Elaeagnus umbellata Thunb. f. nakaiana (Araki) H. Ohba (27)	1.88±0.02e	1.04±0.06e	0.000**	1.53±0.01b	2.18±0.16c	0.100
Punica granatum L. (peel) (32)	12.51±0.34b	8.17±0.13b	0.000**	0.06±0.01c	1.43±0.00c	0.002**
Rubus coreanus Miq (36)	5.37±0.06d	1.58±0.01d	0.000**	1.56±0.03b	1.29±0.01c	0.070
Nelumbo nucifera Gaertner (ovary) (45)	22.73±1.13a	10.07±0.14a	0.000**	0.10±0.00c	0.27±0.00c	0.004**

All values are mean±SD of three replicates.

^a–fMeans within a row with different letters are significantly different.

^*p<0.05,

^**p<0.01 (t-test).