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Table 6 DPPH free radical scavenging activity of 20 Korean, Australian, Brazilian, and Chinese propolis ethanol extracts and a commercial antioxidant agent ascorbic acid

From: Relationship between total phenolic contents and biological properties of propolis from 20 different regions in South Korea

Sample

IC50, μg/mL (95 % CL)

Slope ± SE

χ2a

P-value

P1

43.4 (36.6–51.4)

1.7 ± 0.16

5.32

0.983

P2

115.3 (100.1–132.9)

1.3 ± 0.11

4.29

0.989

P3

52.7 (44.0–63.3)

1.6 ± 0.17

5.71

0.981

P4

80.2(69.4–92.7)

1.3 ± 0.10

4.28

0.989

P5

56.1 (47.6–66.1)

1.5 ± 0.14

5.10

0.985

P6

97.4 (79.9–118.7)

1.2 ± 0.13

5.76

0.980

P7

73.5 (62.7–86.2)

1.4 ± 0.13

4.87

0.986

P8

159.9 (139.7–183.1)

1.9 ± 0.18

4.44

0.990

P9

81.7 (69.8–95.6)

1.9 ± 0.31

5.76

0.983

P10

58.3 (47.1–72.1)

2.2 ± 0.32

6.73

0.976

P11

161.1 (141.8–183.3)

1.9 ± 0.16

4.20

0.991

P12

235.0 (219.6–251.5)

1.3 ± 0.04

1.96

0.998

P13

67.2 (56.0–80.6)

1.7 ± 0.24

6.03

0.979

P14

135.4 (117.1–156.3)

1.7 ± 0.18

4.80

0.988

P15

98.7 (87.1–111.8)

1.4 ± 0.11

3.89

0.991

P16

81.6 (71.8–92.8)

1.4 ± 0.11

4.00

0.991

P17

74.0 (63.7–86.0)

1.6 ± 0.16

4.89

0.987

P18

96.2 (85.0–109.0)

1.5 ± 0.13

4.05

0.991

P19

202.0 (175.0–233.1)

1.5 ± 0.11

4.39

0.989

P20

269.0 (248.3–291.4)

1.5 ± 0.06

2.44

0.996

Australian

73.8 (49.3–110.5)

0.9 ± 0.12

9.76

0.922

Brazilian

148.1 (121.2–180.9)

1.6 ± 0.22

6.51

0.976

Chinese

179.0 (136.8–234.2)

1.8 ± 0.29

8.59

0.958

Ascorbic acid

14.0 (12.4–15.8)

1.8 ± 0.17

4.45

0.983

  1. aPearson’s chi-square goodness-of-fit test