Abstract Several species of Eucalyptus are used in folk medicine as an antiseptic, anti-inflammatory, and against respiratory infections, such as colds, sinus congestion and influenza. These species have shown potential antioxidant properties in addition to antimicrobial activities. In the present paper, we were interested in Eucalyptus blakelyi Maiden, a species belonging to the Myrtaceae family. Our study can be considered as the first detailed report on the chemical composition, antioxidant and antimicrobial activity of different extracts. The aim of the current study is to evaluate the biological activities of essential oils, methanolic and aqueous extracts of this plant. The present work was realized on leaves collected from National Institute for Forest Research (INRF) of Baïnem (Algiers, Algeria), and the results showed that essential oil’s yield obtained by hydrodistillation was 2.13 %. Actually, 15 compounds were identified by GC-MS profile, and the major compound was 1.8-cineole with 62.74 %. Indeed, the antiradical activity using the DPPH method has shown that methanolic and aqueous extracts had an interesting antioxidant ability with an IC50 of 0.33 and 0.39 mg/ ml respectively. The antimicrobial activity of the essential oil, methanolic and aqueous extracts on eleven microbial strains was evaluated using the aromatogram method. Thus, the methanolic extract proved to be the most active compared to the aqueous extract and the essential oil by inducing a maximum inhibition zones of 19.66 mm for Staphylococcus aureus ATCC29213 and 25.66 mm for Candida albicans. The results suggest potential applications of essential oil in food and extracts in pharmaceutical industry.

中文翻译：

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使用精油、甲醇和水提取物评估桉树的一些生物活性

摘要 几种桉树在民间医学中用作防腐剂、抗炎剂和抵抗呼吸道感染，如感冒、鼻窦充血和流感。除了抗菌活性外，这些物种还显示出潜在的抗氧化特性。在本文中，我们对属于桃金娘科的物种 Eucalyptus blakelyi Maiden 感兴趣。我们的研究可以被认为是关于不同提取物的化学成分、抗氧化和抗菌活性的第一份详细报告。当前研究的目的是评估这种植物的精油、甲醇和水提取物的生物活性。目前的工作是在从贝纳姆（阿尔及利亚阿尔及尔）国家森林研究所 (INRF) 收集的叶子上实现的，结果表明，加水蒸馏得到的精油收率为2.13%。实际上，GC-MS 谱图鉴定了 15 种化合物，主要化合物为 1.8-桉树脑，占 62.74%。事实上，使用 DPPH 方法的抗自由基活性表明，甲醇和水提取物具有令人感兴趣的抗氧化能力，IC50 分别为 0.33 和 0.39 mg/ml。使用芳香图法评估了精油、甲醇和水提取物对 11 种微生物菌株的抗菌活性。因此，与水提取物和精油相比，甲醇提取物被证明是最具活性的，通过诱导金黄色葡萄球菌 ATCC29213 的最大抑制区为 19.66 毫米和白色念珠菌的最大抑制区为 25.66 毫米。