TECHNICAL VIABILITY OF TANNINS OF FOUR FOREST SPECIES OF BRAZILIAN SEMI-ARID REGION TO SKIDDER SKINS

Os taninos vegetais s\ue3o encontrados em v\ue1rias esp\ue9cies florestais. Atualmente, os curtidores da Regi\ue3o Nordeste t\ueam no angico-vermelho (Anadenanthera colubrina var. cebil), sua \ufanica fonte de taninos. Este estudo teve como objetivos avaliar o potencial tan\uedfero e a capacidade curtente dos taninos, por meios das caracter\uedsticas f\uedsico-mec\ue2nicas das peles curtidas, de quatro esp\ue9cies florestais de ocorr\ueancia no Semi-\uc1rido brasileiro, visando a possibilitar a diversifica\ue7\ue3o de esp\ue9cies a serem utilizadas nos curtumes da regi\ue3o. Os taninos foram obtidos de angico (Anadenanthera colubrina var. cebil), cajueiro (Anacardium occidentale), jurema-preta (Mimosa tenuiflora) e de jurema-vermelha (Mimosa arenosa). Peles de caprinos foram curtidas com os taninos extra\ueddos dessas esp\ue9cies e comparadas a peles curtidas com tanino comercial de ac\ue1cia negra ("Seta Natur"). Amostras de peles curtidas foram submetidas a testes de resist\ueancia \ue0 tra\ue7\ue3o, ao alongamento e ao rasgamento progressivo. Verificaram-se bons resultados das peles curtidas com os taninos obtidos de jurema-preta e jurema-vermelha. Pela abund\ue2ncia no Semi-\uc1rido brasileiro, a jurema-preta e a jurema-vermelha apresentam potencial de explora\ue7\ue3o para obten\ue7\ue3o de taninos, havendo a necessidade pesquisas que indiquem as melhores formas de aplica\ue7\ue3o dos taninos obtidos.Vegetable tannins are found in several forest species.Actually, the Northeast Brazilian tanners have, on Anadenanthera colubrina var. cebil, theironly source of vegetable tannins.This study aimed to evaluate the tanning capacity of tannins extracted from four vegetable species of Brazilian Semi-arid region, seeking to make possible the diversification of species to be used in tannings in the region. Thus, physical and mechanical characteristics of bovid treated skins with extract tannic of Anadenanthera colubrina var. cebil, Anacardium occidentale, Mimosa tenuiflora and Mimosa arenosa were analyzed. Thebovidskins were tanned with extracted tannins of those species and compared to tanned skins by tannins of Acacia mearnsii ("Seta Natur" commercial tannin). The samples of tanned skins were submitted to tension, lengthening and progressive tear resistance tests. Good results were verified to tanned skins by Mimosa tenuiflora and Mimosa arenosa. Due to the abundance of these species in Brazilian Semi-arid region, they showed potential to exploration of tannins. However, researches are necessaries to indicate the best forms of application of obtained tannins