Department of Chemistry, University of Kelaniya, Kelaniya, Sri Lanka.
J Chem Ecol. 1991 Dec;17(12):2449-58. doi: 10.1007/BF00994593.
A mixture oftrans-2-hexenal;n-tridecane (60:40, w/w), the natural combination present in the defensive secretion ofCoridius janus (Hemiptera; Pentatomidae) was shown by comparison with similar aldehyde mixtures having longer and shorter chainn-alkanes, to be the optimal combination as a fumigant and a repellent against three test insect species,Anoplolepis longipes, Sitotroga cerealella, andCulex quinquefasciatus. Toxic values obtained for the three insects, respectively: 1/LC50, 1.72, 4.54, and 6.66 ppm while repellencies were 63%, 50%, and 69%. This study revealed that amongt-2-hexenal:n-alkane combinations those with medium carbon chains,viz C-11 and C-12, also possessed high toxicities and repellencies comparable to that of the natural combination while those with shorter and longern-alkanes possessed lower activity. Toxicities and repellencies ofn-alkane series were only moderate to low showing highest toxic values forn-tridecane at 1/LC50, 0.39, 2.32, and 2.32 ppm and repellencies at 31%, 30%, and 32% for the three test insects, respectively. This series, nevertheless, showed similar variation, medium length chains, C-11, C-12, and C-13 showing comparatively higher activity than other alkanes of shorter and longer chains. This study also revealed that the fumigant property of both alkane and aldehyde are of equal importance while repellency is heavily dependent on the aldehyde.
一种由反式-2-己烯醛和正十三烷（60:40，质量比）组成的混合物，其与具有更长和更短链正烷烃的类似醛混合物进行对比，显示出作为熏蒸剂和三种测试昆虫（稻绿蝽、玉米螟和致倦库蚊）驱避剂的最佳组合。三种昆虫的毒性值分别为：1/LC50，1.72、4.54 和 6.66 ppm，而驱避率分别为 63%、50%和 69%。本研究表明，在反式-2-己烯醛-正烷烃组合中，具有中等碳链的 C-11 和 C-12 也具有与天然组合相当的高毒性和驱避率，而具有较短和较长链的正烷烃则具有较低的活性。正烷烃系列的毒性和驱避率仅为中等至低等，在三种测试昆虫中，正十三烷的 1/LC50 值最高，为 0.39、2.32 和 2.32 ppm，驱避率分别为 31%、30%和 32%。然而，该系列表现出相似的变化，中等长度的链 C-11、C-12 和 C-13 比其他较短和较长链的烷烃具有更高的活性。本研究还表明，烷烃和醛的熏蒸性能同等重要，而驱避性则严重依赖于醛。
