Article Publish Status: FREE
Abstract Title:

Antibacterial Activity ofL. Essential Oil Vapours and Their GC/MS Analysis Using Solid-Phase Microextraction and Syringe Headspace Sampling Techniques.

Abstract Source:

Molecules. 2021 Oct 29 ;26(21). Epub 2021 Oct 29. PMID: 34770961

Abstract Author(s):

Julien Antih, Marketa Houdkova, Klara Urbanova, Ladislav Kokoska

Article Affiliation:

Julien Antih


While the inhalation ofL. essential oil (EO) is commonly approved for the treatment of mild respiratory infections, there is still a lack of data regarding the antimicrobial activity and chemical composition of its vapours. The antibacterial activity of the threeEOs against respiratory pathogens, including, andwas assessed in both liquid and vapour phases using the broth microdilution volatilisation (BMV) method. With the aim of optimising a protocol for the characterisation of EO vapours, their chemical profiles were determined using two headspace sampling techniques coupled with GC/MS: solid-phase microextraction (HS-SPME) and syringe headspace sampling technique (HS-GTS). All EO sample vapours exhibited antibacterial activity with minimum inhibitory concentrations (MIC) ranging from 512 to 1024 μg/mL. According to the sampling technique used, results showed a different distribution of volatile compounds. Notably, thymol was found in lower amounts in the headspace-peak percentage areas below 5.27% (HS-SPME) and 0.60% (HS-GTS)-than in EOs (max. 48.65%), suggesting that its antimicrobialeffect is higher in vapour. Furthermore, both headspace sampling techniques were proved to be complementary for the analysis of EO vapours, whereas HS-SPME yielded more accurate qualitative results and HS-GTS proved a better technique for quantitative analysis.

Study Type : In Vitro Study

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