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Teor de taninos em três espécies medicinais arbóreas simpátricas da caatinga Tannin concentration in three simpatric medicinal plants from caatinga vegetation

By Julio Marcelino Monteiro, Ernani Machado de Freitas Lins Neto, Elba Lúcia Cavalcanti de Amorim, Ruth R. Strattmann, Elcida Lima Araújo and Ulysses Paulino de Albuquerque

Abstract

O teor de taninos em três espécies medicinais do semi-árido do Nordeste do Brasil foi determinado. A partir de amostras das cascas do caule e folhas de 10 indivíduos de Anadenanthera colubrina (Vell.) Brenam, Myracrodruon urundeuva (Engl.) Fr. All. e Caesalpinia pyramidalis Tul., os teores de fenóis totais e taninos foram determinados em extratos metanólicos 80% pelo método de Folin-Ciocalteau, seguido do método da precipitação de proteínas. Adicionalmente, testou-se a hipótese de que a concentração de taninos está diretamente relacionada com a altura e diâmetro das plantas. As espécies estudadas apresentaram expressivos teores de extrativos tânicos, e os resultados não ratificaram a hipótese testada.<br>A comparative study of tannin concentration in three medicinal plants from caatinga vegetation (Northeast Brazil) was carried out through colorimetric assays. Bark and leaf samples of 10 individuals of each species were extracted with 80% methanol. Tannin was determined by Folin-Ciocalteau analysis for total phenolic materials, followed by precipitation with casein. Additionally, it was tested the hypothesis that the tannin concentration is directly related with the height and diameter of the plants. The results show that the studied species contain an expressive amount of tannins

Topics: Caatinga, taninos, Anadenanthera colubrina, Myracrodruon urundeuva, Caesalpinia pyramidalis, Caatinga, tannins, Anadenanthera colubrina, Caesalpinia pyramidalis, Myracrodruon urundeuv, LCC:Forestry, LCC:SD1-669.5, LCC:Agriculture, LCC:S, DOAJ:Forestry, DOAJ:Agriculture and Food Sciences
Publisher: Sociedade de Investigações Florestais
Year: 2005
DOI identifier: 10.1590/S0100-67622005000600020
OAI identifier: oai:doaj.org/article:285b804371d342f6b3ea84b9ecbde4aa
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