Sample

Concentration of the extract (μg/mL)

EC₅₀

0.5

1

2

4

Flowers

24 ± 2^a

48± 1

85 ± 3

94 ± 0.2

0.99

Leaves

17 ± 1

30 ± 1

57 ± 1

90 ± 0.4

1.47

Bark

22 ± 2

42± 1

76 ± 2

94 ± 0.5

1.12

Quercetin

-

-

-

94 ± 0.5

1.71