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Identification of the stereoisomers of pheromone candidates of Dendrolimus houi (Lepidoptera:Lasiocampidae) with Kováts indexes

ZHANG Xue-Mei~1, WANG Cheng-Ju~1, KONG Xiang-Bo~ 2, ZHANG Zhen~2, WANG Hong-Bin~2(1. Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100094, China; 2. The Key Laboratory of Forest Protection, State Forestry Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China)  
Kováts indexes (KIs) of pheromone candidates of Dendrolimus houi Lajonquière, using n-alkanes as reference series, were calculated on temperature programmed capillary column DB-WAX and DB-5, which was applied to identify pheromone components in extracts of pheromone glands of D. houi. Use of Kováts retention indexes, particularly in combination with high resolution gas chromatography-mass spectrometry (GC-MS), can provide substantial information about the stereochemistry assignment of unknowns, especially when those standards of all possible structures are not available for comparison or only trace amounts of the unknowns available. Furthermore, because KIs are highly reproducible, the procedure looks to be a promising method for differentiation and identification of isomeric pheromone components. In this paper, the stereoisomers of pheromone candidates of D. houi were elucidated to have E5,Z7 geometrical isomers using the method of KIs-GC-MS. In addition, some practical and accuracy aspects of KIs are discussed.
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