Abstract. Benlembarek K, Lograda T, Ramdani M, Figueredo G, Chalard P. 2021. Chemical composition, antibacterial, antifungal and antioxidant activities of Taxus baccata essential oil from Algeria. Biodiversitas 22: 5475-5483. This work aims to study the chemical composition, the antibacterial, antifungal and antioxidant activities of Taxus baccata essential oil of Algeria. The essential oil was obtained by hydro distillation; its chemical composition was determined by GC and GC-MS analysis. The antibacterial and antifungal activities are evaluated by the disk diffusion method against three-gram negative bacteria, four-gram positive bacteria and four phytopathogenic fungi. The evaluation of antioxidant activity is carried out by the DPPH scavenging method. Twenty-seven compounds have been identified in the essential oil, where the major product was undecanone-2, followed by nonanone-2, tridecanone-2, decanone-2 and the methyl dehydroabietic. The T. baccata essential oil showed moderate antibacterial and antifungal activities against the strains tested, with the exception of E. faecalis, MRSA and Fusarium graminum, which have shown significant resistance. T. baccata essential oil has a moderate antioxidant activity.
Abstract. Benlembarek K, Lograda T, Ramdani M, Figueredo G, Chalard P. 2021. Chemical composition and antibacterial activities of Rhus tripartita essential oils from Algeria. Biodiversitas 22: 482-492. The yield of Rhus tripartita essential oils in Algeria is low with an average of 0.16 ± 0.017. The chemical composition of the oils was determined by GC-GC / MS analysis. Seventy-eight compounds were identified with an average of 92.3 ± 26.4% in the total oil. The α-pinene (58.72 ± 14.45%), Δ3-carene (5.21 ± 6.89%), caryophyllene-Z (4.55 ± 4.68%) and β-pinene (3.07 ± 1 85%) are the major components of the oils of R. tripartita populations. The results reveal a notable difference between the chemical composition of essential oils from male and female populations. The oils of this species are composed of four chemotypes, the Δ3-carene, α-pinene; limonene chemotype characterizes the male populations of Tamanrasset and Boussaada. The α-pinene - Δ3-carene - caryophyllene-Z chemotype characterizes the male populations of M’sila and Mergueb. The female M’sila population is characterized by the α-pinene - Δ3-carene - Δ-cadinene chemotype. The remaining populations show the α-pinene - β-pinene - caryophyllene-Z chemotype. The evaluation of antibacterial activities reveals that Staphylococcus aureus, Escherichia coli, Proteus mirabilis and Pseudomonas aeruginosa are not sensitive to the essential oils of R. tripartita. In contrast, Enterococcus faecalis is the most sensitive to the oils.
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