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CONDENSED TANNINS EXTRACTED OF EUCALYPTS BARK WASTE

机译：桉树皮废料中浓缩的鞣质

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摘要

This work aimed evaluate the quality and quantity tannins contained from the eucalypts bark waste. The tannins were extracted with water and aqueous solutions under different concentrations (0, 4, 6, 8 and 10%) of sodium sulfate and sodium carbonate. The influence of the different concentrations of chemical compounds (Na2SO4 and Na2CO3), on yield and extract characteristics, namely: total solids content, tannins yield, non-tannins yield, pH, polyphenols yield by Stiasny reaction and reactive polyphenols contents by ultraviolet method. The results obtained showed that the sodium carbonate solution (8%) provided higher tannins extraction and sodium sulfate solution (4%) the lower amounts. The influence of 8% sodium carbonate on the eucalypts bark characteristics in extraction provided highest Stiasny number and tannins content, in addition, were achieved high extraction yield, indicating the importance of use this concentration of salt in the extraction process. While for sodium sulfate the highest gravimetric yield in tannins was 4%. The eucalypt bark may be used in tannins extraction for being available and allowing a good yield in tannin.
机译：这项工作旨在评估桉树皮废料中所含单宁的质量和数量。用水和水溶液以不同浓度（0、4、6、8和10％）的硫酸钠和碳酸钠萃取单宁酸。不同浓度的化合物（Na2SO4和Na2CO3）对产量和提取物特性的影响，即总固体含量，单宁酸产量，非单宁酸产量，pH，通过Stiasny反应的多酚产量和通过紫外线法的反应性多酚含量。得到的结果表明，碳酸钠溶液（8％）提供了更高的单宁提取率，而硫酸钠溶液（4％）提供了更低的数量。 8％的碳酸钠对桉树皮的萃取特性有很大的影响，提供了最高的锡尼值和单宁含量，此外，萃取率高，这表明在萃取过程中使用这种浓度的盐非常重要。而对于硫酸钠，单宁的最高重量产率为4％。桉树皮可用于单宁提取，因为它可用于单宁并具有良好的单宁收率。

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