Avaliação do potencial tanífero de duas espécies florestais de ocorrência no Semi-árido Brasileiro.

Abstract

The tannins are complex phenolic substances of vegetal origin used in tanning of hides and medicine uses can represent from 2 to 40% of the dry mass of bark of several forestry species. In these research were analyzed the levels of tannins in two forest species present in Lameirão Farm vegetavam, located in the municipality of Santa Terezinha, Paraíba, Brazil.. The samples were air dried and windmill type Willey and classified of 16 mesh (1.00 mm) and 60 mesh. The obtained material was homogenised and the moisture content obtained to enable the calculations in a dry basis, of tannin present in each sample. the tannin was determined by Stiasny’s method. The research assessed the potential of two forest species of occurrence in the brazilian semi-arid region Were utilized 25 g dry weight of sawdust. The Anadenanthera colubrina var.cebil presented 23,3% of total solids and Piptadenia estipulaceae, 11%. The Stiasny’s index of Anadenanthera colubrina var.cebil was 58.8% and P. estipulaceae, 11.8%. According to the highest level of total solid and the largest Stiasny’s index, the tannin condensed of A. colubrina was 13.95% being greater than that of P. estipulaceae. The A. colubrina presents good potential as producing of tannins.