Repellent, insecticidal and antimicrobial activities of leaf essential oils from three Eucalyptus species.

Repellent, insecticidal and antimicrobial activities of leaf essential oils from three Eucalyptus species. Chem Biodivers. 2020 Jan 08;: Authors: Tian Y, Dong F, Yang X, Zhou X Abstract Developing effective and eco-friendly antimicrobials and pesticides has become a highly important issue. The repellent, insecticidal and antimicrobial activity of essential oils (EOs) isolated by hydrodistillation from dried leaves of the three Eucalyptus species ( E. cloeziana, E . umbellata and E. benthamii ) were investigated. During GC-MS analysis, α-pinene (47.36%), 1,8-cineol (38.53%) and α-pinene (35.31%) were identified as major components of E. cloeziana, E . umbellata and E. benthamii , respectively. The EOs from E. cloeziana exhibited the longest effective protection time (465 min, at 50.0% w/w) for humans among the EOs studied. The effective protection time was 30 min and 300 min at concentrations of 12.5% (w/w) and 25.0% (w/w), respectively. Fumigating insecticidal activity of EOs from three Eucalyptus was tested by airtight fumigation in conical flask, which indicated that essential oils had a highly and rapidly insecticidal activity on Culex pipiens quinquefasciatus . The antimicrobial activity of EOs was evaluated by using disc diffusion and agar dilution methods. There was no significant difference in the antibacterial activity of EOs from E. cloeziana and E. umbellate and they had the same MICs (20 ml/L) on Staphylococcus aureus, S...
Source: Chemistry and Biodiversity - Category: Biochemistry Authors: Tags: Chem Biodivers Source Type: research