Department of Agro-environmental Sciences, Chemistry and Plant Protection, University of Foggia, Via Napoli 25, 71122 Foggia, Italy.
J Food Prot. 2012 Feb;75(2):366-70. doi: 10.4315/0362-028X.JFP-11-142.
The purpose of this work was to develop a biodegradable carrier material to control insect pests in cereal products. To this aim, (E)-2-hexenal was used, being a natural compound with antimicrobial activity that is also commonly adopted as a flavoring agent. Three coating layers of polycaprolactone (PCL) were spread onto the internal side of a paperboard carton, the first being the active coating containing (E)-2-hexenal. The antennal sensitivity of Sitophilus granarius to a broad range of doses of (E)-2-hexenal was first demonstrated. Next, the ability of different concentrations of this compound to disrupt the orientation of adult S. granarius beetles to odors of intact wheat kernels was established in a two-choice pitfall bioassay. In addition, invasion tests were carried out over an 8-week period to highlight the effects of the biobased repellent packaging and their potential persistence. The results demonstrated that during the entire monitoring period, the percentage of S. granarius adults found in cartons coated with (E)-2-hexenal-loaded multilayer PCL was about 10 % of the total number of insects used in the bioassay, very low compared with the respective control samples, thus assessing both the effectiveness and persistence of the repellent system developed. Although the infestation level of treated packages was reduced relative to the infestation levels in the controls, any infestation of food packages is unacceptable to consumers, so further tests are required to determine whether infestation can be completely prevented using (E)-2-hexenal.
这项工作的目的是开发一种可生物降解的载体材料来控制谷物产品中的害虫。为此，使用了(E)-2-己烯醛，它是一种具有抗菌活性的天然化合物，也常被用作香料。三层聚己内酯(PCL)涂层涂在纸板纸箱的内侧，第一层是含有(E)-2-己烯醛的活性涂层。首先证明了赤拟谷盗对(E)-2-己烯醛的广泛剂量的触角敏感性。接下来，在双选择陷阱生物测定中，确定了不同浓度的这种化合物破坏成年赤拟谷盗对完整麦粒气味定向能力的能力。此外，还进行了 8 周的入侵测试，以突出生物基驱虫包装的效果及其潜在的持久性。结果表明，在整个监测期间，在涂有(E)-2-己烯醛负载多层 PCL 的纸箱中发现的赤拟谷盗成虫的百分比约为生物测定中使用的昆虫总数的 10%，与各自的对照样品相比非常低，从而评估了所开发的驱虫系统的有效性和持久性。尽管处理过的包装的虫害水平相对于对照的虫害水平有所降低，但任何食品包装的虫害对消费者来说都是不可接受的，因此需要进一步测试，以确定是否可以使用(E)-2-己烯醛完全防止虫害。
