Shahriari_2018_Pestic.Biochem.Physiol_150_40

The current study aimed to determine the potential effects of three essential oil constituents, alpha-pinene, trans-anethole, and thymol, on antioxidant system and acetylcholine esterase (AChE) of Ephestia kuehniella Zeller. The 4th instar larvae were initially fed on an artificial diet containing an LC50 concentration of each above-mentioned compounds separately prior to being undertaken for sample preparation and biochemical assays. The significant higher activities of superoxide dismutase, peroxidase and catalase were observed in the treated-larvae at both time intervals. Similar findings were found in the activity of glutathione S-transferase by using both reagents. Although activities of ascorbate peroxidase and glycerol-6-phosphate dehydrogenase increased in the treated larvae by all constituents while glycerol-6-phosphate dehydrogenase showed no statistically different activity among the larvae fed on alpha-pinene, trans-anethole, and thymol. The concentration of malondialdehyde and the ratio of oxidized (RSSR) to reduced (RSH) thiols showed statistical differences among control and treated larvae except for time interval of 24h regarding the ratio of RSSR/RSH. Finally, our results demonstrated a significant decrease of AChE activity in the treated larvae by all constituents after 24h while no statistical differences were found between control and trans-anethole after 24h. Also, in vitro analysis revealed significant inhibition of AChE representing IC50 values of 0.864, 0.490 and 0.137mul/ml for alpha-pinene, trans-anethole, and thymol, respectively. These results determined significant effects of administered constituents on induction of antioxidant system and inhibition of a nervous system component which expand our knowledge on physiological turbulences due to essential oil treatment.