ABNT NBR 6401 PDF

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With regard to jurema, in a study by Paes et al. The solution was evaluated using four treatments: 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. The results for angico vermelho, in turn, did not show potential for this purpose. The mean comparison is shown in Table 2.

Xbnt design and data analysis The experiment included particle mixtures for all individuals of the same species and parts bark or fruit.

The removal of the bark and fruit was performed in situ without killing the tree, using hand tools including knives and a wooden mallet. The soluble solids correspond to a fraction of the total solids, and the other portion corresponds to the insoluble solid difference between total solids and water soluble solids.

To avoid overheating the mill, milling was performed slowly with periodic stops Paes et al. Generation of analytical solution Comparing the results obtained in this study with the literature was problematic given the different analytical techniques used by the other researchers and also because the methodology of the present study abnh relatively new and directed towards a potential species of the Caatinga biome.

Few studies have been realized to investigate the occurrence of species in the Caatinga, particularly studies seeking to extract and quantify tannins 64401 species, which present potential for commercial exploitation for this purpose Paes et al.

A tendency for the moisture content of jurema bark to exceed that of angico was observed.

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Universidade Federal de Santa Maria; 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, ; Haslam, Remember me Forgot password?

The particles were stored in numbered and sealed bottles, protected from light and humidity.

Boletim de Pesquisa Florestal ; After this, the solution was once again filtered using white belt type filter paper. The extraction to obtain ml of analytical solution followed. Ve tila tilaca ca ir qual qualit ity.

ABNT NBR 6406-1980 Calibradores – Caractersticas construtivas, tolerncias

Journal of Forest Products e Industries ; 2 1: Given this, various methods have been adopted when considering this substance. Mean comparisons are qbnt in Table 2.

The experiment included particle mixtures for all individuals of the same species and parts bark anbt fruit. In a study of acacia species cultivated in Sudan, Haroun et al.

Determination of the anhydrous mass of the particles submmited to extraction Knowing the moisture content secondary sample and air dried mass of the portion transferred to the extraction chamber primary samplethe anhydrous mass of the sample that was submitted to extraction was calculated Equation 2.

It had a completely ant design, with four treatments being evaluated: Pr jeto da inst lacoes Pa Pa Br seguinte: Higher soluble solids values are preferable. The total solids content can be understood as the total of the powdered extract. Additionally, the moisture present facilitated grinding the material, with little loss in the form of yarns and, consequently, with few incrustations in the mill knives.

Services on Demand Journal. No abtn significant differences for tannin content were observed between acacia and angico barks, which presented values of Blank test achievements As required by ASTM a and ISOthe test was performed only by filtering distilled water through the skin powder, determining the dry residue of the filtrate and the corrections to be made from previous analyses.

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The method which uses skin powder is one of the methods recommended to analyze tannins for tanning Yazaki et al. The present study aimed to quantify nnr tannic substances in the bark and fruits of angico vermelho, jurema preta, and acacia negra, using skin powder as detanizador agent.

NBR 16401-3 2008

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.

Your consent to our cookies if you continue to use this website. 64011 differences in humidity can be associated with the period when these authors conducted the study dry seasonthe methodology and the storage location.

The hydrolysable tannins are composed by glucose polyesters and the acid formed; their hydrolysis is classified into gallic tannins or ellagi tannins Pizzi, abny Ricci et al. The highest value for non-tannic soluble solids was observed in angico bark