Luís Ângelo, Neiva Duarte, Pereira Helena, Gominho Jorge, Domingues Fernanda, Duarte Ana Paula
Centro de Investigação em Ciências da Saúde, Universidade da Beira Interior, Av. Infante D. Henrique, Covilhã 6200-506, Portugal.
Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, Lisboa 1349-017, Portugal.
Molecules. 2014 Oct 13;19(10):16428-46. doi: 10.3390/molecules191016428.
These past years have seen an enormous development of the area of natural antioxidants and antimicrobials. Eucalyptus globulus is widely cultivated in subtropical and Mediterranean regions in intensive short rotation coppice plantations. In the Portuguese context, E. globulus is the third species in terms of forest area. The stump is the basal part of the tree, including the near-the-ground stem portion and the woody roots that remain after stem felling. The purpose of this work was to study the phytochemical profile and to evaluate the antioxidant and antimicrobial properties of several crude stump wood and stump bark extracts of E. globulus, comparing it with similar extracts of E. globulus wood (industrial chips). The results showed the presence of high concentrations of total phenolic compounds (>200 mg GAE/g extract) and flavonoids (>10 mg QE/g extract) in E. globulus stump extracts. Generally the stump wood extracts stands out from the other ones, presenting the highest percentages of inhibition of linoleic acid oxidation. It was also possible to conclude that the extracts were more active against Gram-positive bacteria, presenting low MIC values. This study thus provides information supporting the economic valorization of E. globulus stump wood.
在过去几年中，天然抗氧化剂和抗菌剂领域取得了巨大发展。蓝桉在亚热带和地中海地区广泛种植于集约型短轮伐期矮林人工林中。在葡萄牙，就森林面积而言，蓝桉是第三大树种。树桩是树木的基部，包括近地面的茎部以及茎砍伐后残留的木质根。这项工作的目的是研究蓝桉几种粗树桩木材和树桩树皮提取物的植物化学特征，并评估其抗氧化和抗菌性能，同时将其与蓝桉木材（工业木片）的类似提取物进行比较。结果表明，蓝桉树桩提取物中总酚类化合物（>200毫克没食子酸当量/克提取物）和黄酮类化合物（>10毫克槲皮素当量/克提取物）浓度较高。一般来说，树桩木材提取物比其他提取物更突出，对亚油酸氧化的抑制率最高。还可以得出结论，提取物对革兰氏阳性菌更具活性，最低抑菌浓度值较低。因此，本研究提供了支持蓝桉树桩木材经济价值评估的信息。
