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The effects of luteolin on phenoloxidase (PO) from Spodoptera exigua larvae were investigated with the use of a microtitration assay in the present paper. The results showed that luteolin could inhibit the activity of PO and the concentration of this inhibitor that led to a 50% (IC 50 ) activity reduction was estimated to be 0.47 mmol/l. The inhibitory kinetics were analyzed by Lineweaver― Burk plots and the compound was found to be a reversible competitive inhibitor with a K i of 13.11 mmol/l. The compound was obviously toxic against the larvae (≤3rd instar) of Spodoptera exigua. The highest inhibitory percentage in the older larvae ≥3rd instar) was greater than 60% with luteolin treatment. The pupation rate and percentage of eclosion was also evidently reduced with luteolin treatment by the ingestion method in this investigation.

The effects of luteolin on phenoloxidase and the growth of Spodoptera exigua (Huebner) larvae (Lepidoptera: Noctuidae)