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.
Means within a row with different letters are significantly different.
p<0.05,
p<0.01 (t-test).