Acetylcholinesterase Inhibitory Activities of Flavonoids from the Leaves of Ginkgo biloba against Brown Planthopper

Table 1

AChE inhibitory activity of compounds 1–15.

Compound	IC50 (𝜇g/mL)^a
1	100.5
2	95.8
3	88.5
4	110.9
5	79.4
6	57.8
7	77.5
8	73.1
9	97.8
10	112.6
11	101.7
12	133.1
13	103.8
14	—^b
15	—
Chlorpyrifos	12.4

aAll compounds were examined in a set of experiments repeated three times; IC₅₀ values of compounds represent the concentration that caused 50% enzyme activity loss. ^bNo inhibitory activity.