Biochemical features of organic extractives from Eucalyptus and Corymbia woods using ethanol as a solvent

IF 1.2 4区农林科学 Q3 MATERIALS SCIENCE, PAPER & WOOD

Maderas-ciencia Y Tecnologia Pub Date : 2021-08-01 DOI:10.4067/s0718-221x2021000100807

K. T. Barbosa, A. Acosta, H. Schulz, I. Santi, R. Delucis, R. Beltrame, D. Gatto

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Abstract

The objective of this study is to evaluate chemical characteristics, as well as antioxidant and antibacterial activities of organic compounds extracted from three Eucalyptus woods and Corymbia maculate wood using ethanol as a solvent. To obtain the ethanolic extracts, 15 g of a powdered wood sample was mixed with 150 mL of ethyl alcohol 99 % PA by constant mechanical stirring, which was further magnetically mixed at 60 oC for 24 h. The extractives were analyzed by means of percent yield, Fourier-transform infrared spectrum, inhibitory index (measured after antimicrobial tests), antioxidant activity, and condensed tannins content. The Eucalyptus dunnii extract showed the highest percent yield. The infrared spectra of all the extractives presented similar profiles, with remarkable bands ascribed to the presence of lipophilic extracts, sterols, fatty acids, and other hydroxylated substances, such as carbohydrates and phenolic compounds. In all cases, the higher the concentration of the extractive was, the higher the antioxidant activity was. The antioxidant activity of Eucalyptus saligna extract stood out since overcame that of the positive control (ascorbic acid). Regarding the condensed tannins content, that extract from Eucalyptus grandis excelled

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以乙醇为溶剂提取桉木和山茱萸有机提取物的生化特性

本研究以乙醇为溶剂，对三种桉树和山杉木中提取的有机化合物的化学特性、抗氧化和抗菌活性进行了研究。为获得乙醇提取物，将15 g木粉样品与150 mL 99% PA的乙醇不断机械搅拌混合，并在60℃下进行24 h的磁混合。通过收率、傅里叶变换红外光谱、抑制指数(抗菌试验后测量)、抗氧化活性和缩合单宁含量来分析提取物。dunnii桉叶提取物提取率最高。所有提取物的红外光谱都呈现出相似的特征，其中有明显的亲脂性提取物、甾醇、脂肪酸和其他羟基化物质，如碳水化合物和酚类化合物。在所有情况下，提取物浓度越高，抗氧化活性越高。桉树提取物的抗氧化活性优于阳性对照(抗坏血酸)。在浓缩单宁含量方面，大桉提取物的浓缩单宁含量最高

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来源期刊

Maderas-ciencia Y Tecnologia 工程技术-材料科学：纸与木材

CiteScore

2.60

自引率

13.30%

发文量

审稿时长

>12 weeks

期刊介绍： Maderas-Cienc Tecnol publishes inedits and original research articles in Spanish and English. The contributions for their publication should be unpublished and the journal is reserved all the rights of reproduction of the content of the same ones. All the articles are subjected to evaluation to the Publishing Committee or external consultants. At least two reviewers under double blind system. Previous acceptance of the Publishing Committee, summaries of thesis of Magíster and Doctorate are also published, technical opinions, revision of books and reports of congresses, related with the Science and the Technology of the Wood. The journal have not articles processing and submission charges.