Tannin Content of the Bark and Branch of Caatinga Species
Tarcila Rosa da Silva Lins *
Department of Forest Science, Federal University of Paraná, Brazil.
Rafael Leite Braz
Department of Forest Science, Federal Rural University of Pernambuco, Brazil.
Thiago Cardoso Silva
Department of Forest Science, Federal Rural University of Pernambuco, Brazil.
Emmanoella Costa Guaraná Araujo
Department of Forest Science, Federal Rural University of Pernambuco, Brazil.
Jordânia Xavier de Medeiros
Department of Forest Science, Federal Rural University of Pernambuco, Brazil.
Cibelle Amaral Reis
Department of Forest Science, Federal Rural University of Pernambuco, Brazil.
*Author to whom correspondence should be addressed.
Abstract
This research aimed to determine the concentration of tannins in the bark and in the branches of ten species of Caatinga occurrence. The Folin-Denis colorimetric method was used to determine the phenol content and the tannins are precipitated using a protein. The tannin content was obtained by the difference between the supernatant and the non-tannic phenol content. The data were subjected to the Shapiro-Wilk normality’s test and after, to Analysis of Variance using a 2x10 factorial design and Turkey’s test was used to detect differences. For bark sample, the species Parapiptadenia zehntneri, Parapiptadenia rigida and Libidibia ferrea presented the three highest percentages among the studied species, being 10.84%, 10.74% and 10.27%, respectively. For branch sample, Aspidosperma pyrifolium presented the highest percentage of tannins among the ten species, with 9.15% of these substances. It is possible to suggest the use of other parts of the tree to extract the tannins, such as the branches and their bark, offering an alternative for the extraction that is usually made from the main trunk and providing sustainability to the Caatinga.
Keywords: Caatinga's species, non-timber forest product, wood extractive, phenolic compounds.