Abstract: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 essen-tial oils (EOs) are the most suitable to protect food from insect pests. In this study, we determined thechemical composition of three oregano EOs and assessed their toxicity and deterrence to ovipositionagainst the blowflyCalliphora vomitoriaL. The chemical analyses showed that the EOs belonged tothree 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 allthe three EOs chemotypes are able to exert a toxic activity againstC. vomitoriaadults (LD50from0.14 to 0.31μL insect−1) and eggs (LC50from 0.008 to 0.038μL cm−2) as well as deter the oviposi-tion (Oviposition Activity Index, OAI, from 0.40±0.04 to 0.87±0.02), the bioactivity of oreganoEOs significantly varies among the chemotypes, with the thymol-rich EOs (TCC and TTC) overalldemonstrating more effectiveness than the carvacrol-rich (CC) EO

Bioactivity of Different Chemotypes of Oregano Essential Oil against the Blowfly Calliphora vomitoria Vector of Foodborne Pathogens.

Antonella Verzera;
2021-01-01

Abstract

Abstract: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 essen-tial oils (EOs) are the most suitable to protect food from insect pests. In this study, we determined thechemical composition of three oregano EOs and assessed their toxicity and deterrence to ovipositionagainst the blowflyCalliphora vomitoriaL. The chemical analyses showed that the EOs belonged tothree 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 allthe three EOs chemotypes are able to exert a toxic activity againstC. vomitoriaadults (LD50from0.14 to 0.31μL insect−1) and eggs (LC50from 0.008 to 0.038μL cm−2) as well as deter the oviposi-tion (Oviposition Activity Index, OAI, from 0.40±0.04 to 0.87±0.02), the bioactivity of oreganoEOs significantly varies among the chemotypes, with the thymol-rich EOs (TCC and TTC) overalldemonstrating more effectiveness than the carvacrol-rich (CC) EO
2021
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11570/3191307
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