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|metadata.artigo.dc.title:||Chemical characterization of the bark of Eucalyptus urophylla hybrids in view of their valorization in biorefineries|
Mota, Graciene da Silva
Mori, Fábio Akira
Eucalyptus urophylla hybrids
Híbridos de Eucalyptus urophylla
|metadata.artigo.dc.identifier.citation:||SARTORI, C. et al. Chemical characterization of the bark of Eucalyptus urophylla hybrids in view of their valorization in biorefineries. Holzforschung, Berlin, v. 70, n. 9, p. 819-828, 2016.|
|metadata.artigo.dc.description.abstract:||Eucalyptus urophylla hybrids are important raw materials for the forest industry in Brazil, and large quantities of barks are available at mill site that may be used for added-value products. The chemical composition of barks of six commercial hybrids clones of E. urophylla×E. grandis, E. urophylla×E. Camaldulensis, and undisclosed E. urophylla hybrids was studied. The hybrids had similar composition, on average (data based on oven dry bark): 16% extractives, mainly corresponding to polar compounds that are soluble in ethanol and water, 19% lignin, 47% polysaccharides, 1% suberin, and 2% ash. The polysaccharides consists mainly of cellulose as indicated by 84% of total neutral monosaccharides in the acid hydrolysate and 10% xylose. The compositions of the lipophilic extracts was determined by GC-MS before and after alkaline hydrolysis. In all the barks, fatty acids, and triterpenes (namely: betulinic and ursolic acids) were the most abundant compounds followed by smaller amounts of sterols, long-chain aliphatic alcohols, phenolic acids, and acylglycerols. The ethanol-water bark extract had a high phenolic content: total phenolics ranged 211–551 mg gallic acid equivalents (GAE) g-1 of extract, tannins 76–184 mg catechin equivalents (CE) g-1 extract, and flavonoids 98–234 mg CE g-1 of extract. The antioxidant activity corresponds to 338 mg Trolox g-1 of extract. Development of high-value products is proposed through an integrated biorefinery approach including valorisation of extractives and targeting for cellulose-based applications.|
|Appears in Collections:||DCF - Artigos publicados em periódicos|
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