Planta Med 2018; 84(03): 160-167
DOI: 10.1055/s-0043-118912
Biological and Pharmacological Activity
Original Papers
Georg Thieme Verlag KG Stuttgart · New York

Liquid and Vapor-Phase Activity of Artemisia annua Essential Oil against Pathogenic Malassezia spp.

Francesca Santomauro
1  University of Florence, Department of Human Health Sciences, Florence, Italy
,
Rosa Donato
1  University of Florence, Department of Human Health Sciences, Florence, Italy
,
Gabriella Pini
2  University of Florence, Department of Experimental and Clinical Medicine, Florence, Italy
,
Cristiana Sacco
1  University of Florence, Department of Human Health Sciences, Florence, Italy
,
Roberta Ascrizzi
3  University of Pisa, Department of Pharmacy, Pisa, Italy
,
Anna Rita Bilia
4  University of Florence, Department of Chemistry, Sesto Fiorentino, Florence, Italy
› Author Affiliations
Further Information

Publication History

received 06 June 2017
revised 14 August 2017

accepted 23 August 2017

Publication Date:
06 September 2017 (eFirst)

Abstract

Artemisia annua essential oil has given us many encouraging results for its numerous antimicrobial properties. In this study, the essential oil, both in liquid and in vapor phases, was tested against various Malassezia species closely related to many skin disorders in humans and animals. Malassezia treatment and eradication are mainly based on old azole drugs, which are characterized by poor compliance, unpredictable clinical efficacy, emerging resistance, and several side effects. Monoterpenes (ca. 88%) represent the most abundant group of compounds in the essential oil, mainly the oxygenated derivatives (ca. 74%) with camphor (25.2%), 1,8-cineole (20%), and artemisia ketone (12.5%). In vapor phase, monoterpenes represent more than 98% of the constituents, α-pinene being the main constituent (22.8%), followed by 1,8-cineole (22.1%) and camphene (12.9%). Essential oil of A. annua, both in vapor phase and liquid, showed strong antimicrobial activity towards almost the tested twenty strains of Malassezia analyzed. The minimum fungicidal concentrations from most of the strains tested were from 0.78 µL/mL to 1.56 µL/mL, and only three strains of Malassezia sympodialis required a higher concentration of 3.125 µL/mL. Overall, the minimal inhibitor concentrations obtained by vapor diffusion assay were lower than those obtained by the liquid method. The average values of minimal inhibitor concentrations obtained by the two methods at 72 h are 1.3 – 8.0 times higher in liquid compared to those in the vapor phase.

Supporting Information