Use este identificador para citar ou linkar para este item: http://repositorio.ufla.br/jspui/handle/1/33404
Título : Tannin extraction and characterization of polar extracts from the barks of two eucalyptus urophylla hybrids
Autor: Sartori, Caroline J.
Mota, Graciene Silva
Miranda, Isabel
Mori, Fábio Akira
Pereira, Helena
Palavras-chave: Eucalyptus urophylla hybrids
Tannin extraction
Híbridos de eucalipto urophylla
Extração de tanino
Publicador: NC State University
Data da publicação: 2018
Referência: SARTORI, C. J. et al. Tannin extraction and characterization of polar extracts from the barks of two eucalyptus urophylla hybrids. BioResources, [S. l.], v. 13, n. 3, p. 4820-4831, 2018.
Abstract: Barks from two commercial clones of Eucalyptus urophylla hybrids used by the charcoal industry in Brazil were analyzed, with their polar extracts characterized. Also, tannins were extracted with water and sodium sulfite. The mean bark chemical composition showed 2.6% ash, 16% extractives (89% of which were polar extractives), 1.2% suberin, 18.9% lignin, and 61.4% polysaccharides composed mainly of glucans (glucose 48.3% of bark) and xylans (xylose plus arabinose 10.1% of bark). The polar extracts included high mean contents of total phenolics (380.9 mg GAE / g extract), flavonoids (178.4 mg CE / g extract), and tannins (67.7 mg CE / g extract). The mean antioxidant activity of the extracts was low (53.6 mg Trolox / g of bark extract). The extracts had Stiasny indices of 20% with water and 45% with sodium sulfite solution. The FTIR spectra showed condensed tannin bands characteristic of C=C, C-C, and O-H bonds. The barks of E. urophylla hybrids are a potential source of polar extractives that may represent an important valorization.
URI: http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_13_3_4820_Sartori_Tannin_Extraction_Polar_Extracts
http://repositorio.ufla.br/jspui/handle/1/33404
Idioma: en_US
Aparece nas coleções:DCF - Artigos publicados em periódicos

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