2020, 28(5):79-88.
Abstract:
To explore the use of volatile components in grains to attract pests and improve the trapping control effect, volatile organic compound variety and relative content of ten kinds of cereals were determined by the methods of headspace solid-phase micro-extraction (SPME) at 28 ℃ and GC-MS analysis. And attractive effect of the cereals on larva of the Indian moth, Plodia interpunctella (Hübner) was also assayed at same temperature. Nine categories of volatiles were found including alkanes, alkenes, aromatic aldehydes, alcohols, acids, ketones, esters and furans in headspace sampling of ten kinds of cereals by the solid phase microextraction/gas mass spectrometry analysis. There were significant differences in volatile species and relative contents among grains. The substance numbers of the volatile organic compounds from coix seeds, buckwheat, wheat, sorghum, oats, millet, broomcorn millet, barley, rice, and corn were 30, 26, 23, 22, 20, 20, 19, 16, 15, and 15 respectively. The oat, coix seeds and sorghum have the highest attraction rates which were 30%, 25% and 23%, respectively. The attractive rate of wheat, rice, buckwheat and corn was about 14%, while that of millet, barley and millet was less than 9%. The relative content of aldehydes in oats and coix seeds with high attraction rate to larvae was the highest, and the relative content of acids in sorghum was the highest. Aldehydes and acids which were relatively high in these three kinds of cereals, as well as 2-Methyl-Hexadecane、3,5-Octadien-2-ol、2,2-Dimethyl-1-octanol、β-Elemene、Linalool、Cedrenol、Cedrol、Ethyl hexanoate、2,2,4,4,6-Pentamethylheptane、Hexanoic acid、Tridecanoic acid、Butyl undecyl ester phthalic acid which existed in specific volatiles in oats, coix seeds and sorghum were all worth to be further studied.
