Analysis of Effects of Volatile Substances from Cheyletus malaccensis in Grain Based on Gas Chromatography-Ion Mobility Spectrometry
The effect of grain volatile organic compounds(VOCs)after application natural enemies of stored grain pests is an important part to evaluate the safety of natural enemy control technology.Cheyletus malaccensis is an important natural enemy in warehouses in China.In this study,the effects of Cheyletus malaccensis on VOCs in grain after application in granaries were studied.Cheyletus malaccensis,grain and grain with Cheyletus malaccensis were collected to extract the VOCs by gas chromatography-ion mobility spectrometry(GC-IMS),and the fingerprints were formed.The VOCs of wheat and rice with Cheyletus malaccensis in different storage periods were analyzed to e-valuate the safe application of Cheyletus malaccensis.The results indicated that the VOCs of pure Cheyletus malaccensis increased with the number,and 23 were detected in 500 Cheyletus malaccensis,62 in pure wheat and 89 in pure rice.No specific VOCs were found in wheat with natural enemies,but there were differences in the contents of 26 VOCs.In addition,the contents of 6 VOCs in pure wheat were very different with the extension of storage time(P＜0.01),while the contents of 3 substances in wheat with natural enemies also changed.Similarly,no specific VOCs were found in rice with natural enemies,but the contents of 38 VOCs were found to be different.With the extension of storage time,the contents of 5 VOCs were very different in pure rice(P＜0.01),while the contents of 8 VOCs changed in rice with nat-ural enemies.In conclusion,the types of VOCs did not change,but the concentration was changed.
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