Abstract
ABSTRACT This study aimed to quantify the tannic content of the barks and fruit of angico-vermelho, jurema-preta and acacia-negra using skin powder as detanizador agent. Materials from these species were ground and classified, with 12.5g of air dried particles subjected to extraction using a steam jacket type extractor to obtain 1000 ml of solution, using a completely randomized analytic design. The solution was evaluated using four treatments: angico bark; jurema bark; acacia bark and angico fruit. Three replicates per treatment were realized and subrepetitions were analyzed in triplicate. The results were interpreted by comparison of means with Tukey test at 5% significance. Best results in terms of total solids content, were observed in acacia bark (67.2%), differing statistically for angico bark (63.5%). The soluble solids content, in turn, was superior to angico bark (60.3%), differing statistically from acacia bark (49.8%). No statistically significant differences for tannin content were observed between acacia and angico barks, which presented values of 28.4 and 26.8%, respectively.
Highlights
The present study aimed to quantify the tannic substances in the bark and fruits of angico vermelho, jurema preta, and acacia negra, using skin powder as detanizador agent
In which: Total Solids (TS) = % total solids; Sea = dry mass (g) of the residue extrapolated to the total volume of the solution (1L); Mae = dry mass (g) of the sample used in the extraction (Equation 2)
Quantification of tannins by the skin powder method was based on the methodology presented by the technical standards D 6401-99 (ASTM, 2004a), NBR 11131 (ABNT, 2008b) and ISO 14088 (ISO, 2009)
Summary
Tannic agents may be understood as natural, synthetic or mineral substances capable of transforming skin into leather, which occurs due to chemical bonds between the collagen of the skin and polyphenols (Panshin et al, 1962; Haslam, 1966). A lack of proper management, coupled with uncontrolled exploitation of angico vermelho and jurema preta, especially due to the lack of options in terms of species for tannin production, which would make it possible to constitute mixtures for skin tanning over the short term, has led to a depletion of these forest species, as well as affecting the production chain and the livelihood of families that depend on them (Diniz et al, 2003). The present study aimed to quantify the tannic substances in the bark and fruits of angico vermelho, jurema preta, and acacia negra, using skin powder as detanizador agent
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