Bark Characterisation of the Brazilian Hardwood Goupia glabra in Terms of Its Valorisation

Jair Figueiredo Carmo, Isabel Miranda, Teresa Quilhó, Alexandre Monteiro Carvalho, Fábio H. D. J. Carmo, João Vicente de Figueiredo Latorraca, Helena Pereira

Abstract


The bark of Goupia glabra trees grown in a native forest area in the Amazon region of Brazil was anatomically and chemically characterised for potential use as a chemical source for bio-refineries. The bark is silvery-grey to reddish-grey, with a scaly rhytidome composed of 2 to 3 periderms with a small phellem content. The phloem has abundant sieve tube members and a conspicuous presence of sclerified nodules of fiber-sclereids or sclereids; no fibers were observed. The bark had the following average composition (dry mass): 5.2% ash, 24.6% total extractives, 1.1% suberin, and 43.8% total lignin. The polysaccharide composition showed a high ratio of xylan hemicelluloses to cellulose. The ethanol-water bark extract showed high antioxidant capacity. The chemical characterisation of different granulometric fractions showed that extractives were present preferentially in the finest fractions, particularly with enrichment in ethanol solution.

Keywords


Goupia glabra; Bark; Anatomy; Chemical composition; Fractionation; Extractives

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