Abstract
ABSTRACT. Essential oil (EO) was extracted from Melaleuca cajuputi Powell leaves using the steam distillation method. The main aim of this study is to determine several physicochemical properties of EO, including acid value, saponification value, ester value, relative density, absolute density, and freezing point. In addition, the chemical components were also analyzed using the gas chromatography–mass spectrometry (GC–MS) method. The obtained 1,8-cineol content is quite high (71.83%). In addition, these components in EO had an antioxidant capacity and antibacterial activity, including gram-positive and gram-negative bacteria (using the paper disc diffusion method for antibiotic susceptibility testing). Particularly, this EO inhibited the growth of Escherichia coli (ATCC 25922), Salmonella enteritidis (ATCC 13076), and Staphylococcus aureus (ATCC 25923).
 
 KEY WORDS: Antimicrobial activity, Antioxidant capacity, GC-MS, Essential oil, Melaleuca cajuputi Powell.
 
 Bull. Chem. Soc. Ethiop. 2021, 35(3), 677-683.
 DOI: https://dx.doi.org/10.4314/bcse.v35i3.18
Highlights
Melaleuca cajuputi Powell is a vigorous plant adapted to nutrient-poor soils, especially acid soils, cracking black clay, black peaty sand, and clay loam [1, 2]
The results indicate that the chemical composition and yield of extraction of Essential oil (EO) depend on different extraction methods and sources of the plant [5, 6]
Until now, there have been no studies on the chemical components, antibacterial activity, and physical properties of EO of M. cajuputi leaves from Quang Tri province (Vietnam)
Summary
Melaleuca cajuputi Powell (common name: cajuput tree or white tea tree) is a vigorous plant adapted to nutrient-poor soils, especially acid soils, cracking black clay, black peaty sand, and clay loam [1, 2] This plant has a high economic value in Vietnam; it can be used as building materials, made into paper powder, or the EO extracted from its leaves can be applied in pharmaceutical technology [1]. Until now, there have been no studies on the chemical components, antibacterial activity, and physical properties of EO of M. cajuputi leaves from Quang Tri province (Vietnam). The AC was recorded by observing the decrease in absorbance at 517 nm against a control sample (containing only DPPH in ethanol solution without the tested sample). The data were analyzed using Statgraphics Centurion XV software (version 15.1.02, Statgraphics Technologies, Inc., USA)
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