EXTRACTION, QUANTIFICATION, AND FTIR CHARACTERIZATION OF BARK TANNINS OF FOUR FOREST SPECIES GROWN IN NORTHEAST BRAZIL

IF 0.6 4区农林科学 Q4 FORESTRY

Revista Arvore Pub Date : 2021-01-01 DOI:10.1590/1806-908820210000041

Sarah Rebeka Rodrigues Marques, Tatiane Kelly Barbosa Azevêdo, A.R.F. De Castilho, R. Braga, A. Pimenta

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引用次数: 7

Abstract

ABSTRACT Condensed tannins are chemical compounds derived from the secondary metabolism of plants. They are of particular interest due to their broad range of technological uses and applications. The objective of this study was to extract, quantify, and characterize by Fourier-transform infrared spectroscopy (FTIR) the bark tannins of four forest species grown in Northeast Brazil: Acacia mangium, Azadirachta indica, Mimosa tenuiflora, and Mimosa caesalpiniifolia. Bark samples were collected from 5 trees of each species grown in a five-year-old forest stand. Samples were collected, grounded, and submitted to extraction with hot water, then measured to determine total solids content (TSC), Stiasny number (SN), and condensed tannins content (CTC). FTIR spectra were acquired from tannin samples fixed in potassium bromide pellets. Among the four species, M. tenuiflora presented the highest CTC, equal to 23.4%, and the purest crude hot-water extract with SN of 91.27%. Based on FTIR characterization, tannins from M. caesalpiniifolia, A. indica, and A. mangium barks were classified as proanthocyanidins and those from M. tenuiflora bark as prodelphinidins.

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巴西东北部生长的四种森林树种树皮单宁的提取、定量和特征分析

缩合单宁是植物次生代谢产生的化合物。由于其广泛的技术用途和应用，它们特别令人感兴趣。本研究利用傅里叶变换红外光谱(FTIR)对巴西东北部生长的四种森林树种——mangium、Azadirachta indica、Mimosa tenuflora和Mimosa caesalpiniifolia树皮单宁进行提取、定量和表征。在一个5年的森林林分中，从每个物种的5棵树上采集树皮样本。样品采集、研磨、热水提取，测定总固体含量(TSC)、斯蒂斯尼数(SN)和缩合单宁含量(CTC)。对固定在溴化钾球团中的单宁样品进行了红外光谱分析。4种植物中，藤茅的CTC最高，为23.4%;热水粗提物的SN最纯，为91.27%。FTIR分析结果表明，荆芥、籼米和mangium树皮中的单宁为原花青素，荆芥树皮中的单宁为原花青素。

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来源期刊

Revista Arvore FORESTRY-

CiteScore

1.00

自引率

0.00%

发文量

审稿时长

4-8 weeks

期刊介绍： A Revista Árvore é um veículo de comunicação científica da Sociedade de Investigações Florestais – SIF. O jornal é de acesso gratuito, revisado por pares, que publica bimestralmente trabalhos científicos originais no campo da Ciência Florestal. As áreas temáticas para publicação são: Ambiência e Conservação da Natureza, Manejo Florestal, Silvicultura e Tecnologia da Madeira e Utilização de Produtos Florestais. A política editorial visa manter alta conduta ética em relação à publicação e aos seus funcionários, rigor na qualidade dos artigos científicos, seleção de revisores qualificados, respeito profissional aos autores e processo de tomada de decisão imparcial. A Revista Árvore publica artigos apenas em inglês. Artigos de revisão podem ser publicados se houver uma discussão relevante resumindo o estado da arte sobre o assunto. A revisão estrita da literatura não é aceita.