TANINOS CONDENSADOS DA CASCA DE ANGICO-VERMELHO (Anadenanthera colubrina var. cebil ) EXTRAÍDOS COM SOLUÇÕES DE HIDRÓXIDO E SULFITO DE SÓDIO

Abstract

This research aimed to evaluate the tannins extracted content of Anadenanthera colubrina (Vell.) Brenan var. cebil (Gris..) Alts. bark in aqueous solution of sodium hydroxide, sodium sulfite and hydroxide + sulfite having as comparison the amount extracted in distilled. A total of 25 g of dry sawdust and 3% of chemicals were used with relationship to dry weight of sawdust. To compare the effect of water with one of the other used solutions it was found that the addition of sodium hydroxide, sodium sulfite or hydroxide + sulfite caused an increase in solid total contents (TST) of 60,17%, 28,45% and 60,17%, in condensed tannin contents (TTC) of 34,5%, 20,02% and 18,02% and of no-tannins of 117,34%, 47,3% and 146,6% and a reduction in the Stiasny’s index of 15,62%, 5,53% and 24,51%, respectively. Statistical analyzes showed that the sodium hydroxide solution extracted a larger amount from tannic substances when compared with the water, having the sodium sulfite and the hydroxide + sodium sulfite solutions presented middlemen results. The distilled water extracted a lower solid total content than other solutions, but the extract contained a greater Stiasny’s index than those obtained by other solutions.