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Bioactivity of Different Chemotypes of Oregano Essential Oil against the Blowfly Calliphora vomitoria Vector of Foodborne Pathogens
Insects ( IF 3 ) Pub Date : 2021-01-11 , DOI: 10.3390/insects12010052
Stefano Bedini , Priscilla Farina , Edoardo Napoli , Guido Flamini , Roberta Ascrizzi , Antonella Verzera , Barbara Conti , Lucia Zappalà

Blowflies play a substantial role as vectors of microorganisms, including human pathogens. The control of these insect pests is an important aspect of the prevention of foodborne diseases, which represent a significant public health threat worldwide. Among aromatic plants, spices essential oils (EOs) are the most suitable to protect food from insect pests. In this study, we determined the chemical composition of three oregano EOs and assessed their toxicity and deterrence to oviposition against the blowfly Calliphora vomitoria L. The chemical analyses showed that the EOs belonged to three chemotypes: one with a prevalence of carvacrol, the carvacrol chemotype (CC; carvacrol, 81.5%), and two with a prevalence of thymol, the thymol/p-cymene and thymol/γ-terpinene chemotypes (TCC and TTC; thymol, 43.8, and 36.7%, respectively). The bioassays showed that although all the three EOs chemotypes are able to exert a toxic activity against C. vomitoria adults (LD50 from 0.14 to 0.31 μL insect−1) and eggs (LC50 from 0.008 to 0.038 μL cm−2) as well as deter the oviposition (Oviposition Activity Index, OAI, from 0.40 ± 0.04 to 0.87 ± 0.02), the bioactivity of oregano EOs significantly varies among the chemotypes, with the thymol-rich EOs (TCC and TTC) overall demonstrating more effectiveness than the carvacrol-rich (CC) EO.

中文翻译:

不同化学类型的牛至精油对食源性病原菌蝇v愈伤组织载体的生物活性

蝇类作为包括人类病原体在内的微生物的载体发挥着重要作用。控制这些害虫是预防食源性疾病的重要方面,食源性疾病代表了全球范围内重大的公共卫生威胁。在芳香植物中,香料香精油(EOs)最适合保护食物免受虫害侵害。在这项研究中,我们确定了三种牛至EO的化学成分,并评估了它们对苍蝇Calliphora vomitoria L的毒性和对产卵的威慑作用。化学分析表明,EO属于三种化学型:一种是香芹酚,一种是香芹酚。 (CC;香芹酚,81.5%),和两个百里酚的流行,百里酚/ p-cymene和百里香酚/γ-萜品烯的化学型(TCC和TTC;百里香酚,分别为43.8和36.7%)。生物测定法显示,尽管所有三种EOs化学型都能够对毒成虫(LD 50从0.14到0.31μL昆虫-1)和卵(LC 50从0.008到0.038μLcm -2)发挥毒性作用由于阻止了产卵(产卵活动指数,OAI,从0.40±0.04到0.87±0.02),牛至EOs的生物活性在化学类型之间显着不同,富含百里酚的EOs(TCC和TTC)总体上比香芹酚更有效。 -富(CC)EO。
更新日期:2021-01-11
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