Potencial taninífero da jurema preta e do angico vermelho avaliado por diferentes métodos

Abstract

The chemical characterization and the determination of secondary compounds in native legumes are very important for enabling better use these plants as raw material for various segments in the industry. This study aimed to characterize the chemical-bromatological bark and leaves with stems of two native legumes, quantify and characterize the fractions of condensed tannins. The species were collected: ‗Jurema preta‘ (Mimosa tenuiflora (Willd) Poiret) and ‗Angico vermelho‘ (Anadenanthera macrocarpa (Benth) Brenan.), in three cities of the northeastern semiarid: Arcoverde / PE, Patos / PB and Delmiro Gouveia / AL. The chemical analysis performed were: dry matter (DM), mineral matter (MM), crude protein (CP), neutral detergent fiber (NDF) and acid detergent fiber (ADF), neutral detergent insoluble nitrogen (NDIN) and acid detergent insoluble nitrogen (ADIN) and lignin digested in acid (LDA) and condensed tannins by the methodologies of HCl-Butanol and phenols by the precipitable protein (PPP). The chemical-composition data and fractions of condensed tannins were analyzed using descriptive statistics, and to compare the methods of quantification of the total condensed tannins was used the t test, at 5% significance level. They were obtained values of DM, CP and PIDA to the leaves with stems of Jurema preta e angico vermelho respectively: 435.2; 428.83 g / kg MN, 159.3; 199.6 g / kg DM, 60.1; 66.64 g / kg CP. As for total condensed tannins through the HCl-Butanol methodologies and phenols by precipitable protein, respectively, 165.32 and 258.70 g / kg DM for leaves with stems and 456.64 and 360.97 for the shells. And for the Angico vermelho: 52.62 and 162.26 g / kg DM to the leaves with stems and 168.04 and 376.03 for the shells. Concluding that a portion of the crude protein of legumes studied is unavailable because it is connected to the ADF and condensed tannins. Jurema preta was the species that showed higher total condensed tannins content. And the PPP methodology is considered the most efficient quantification of condensed tannins.