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Bark of Astronium lecointei Ducke trees from the Amazon: chemical and structural characterization

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Abstract

The bark of the Astronium lecointei Ducke tree, a species native to the Brazilian Amazon, was characterized in relation to anatomical and chemical features. The chemical composition was studied for the first time. The bark of A. lecointei has a periderm with thick phellem layer and the phloem has abundant sieve tube members and a conspicuous presence of sclerified nodules of sclereids. The mean chemical composition of A. lecointei bark was 5.8% ash, 12.9% total extractives that were principally polar compounds soluble in water and ethanol, 32.7% lignin, 1.8% suberin, and 46.9% polysaccharides. The ethanol and water extracts contained phenolics compounds (77.1 mg gallic acid equivalents/g extract), flavonoids (58.7 mg catechin equivalents/g extract) and tannins (7.3 mg catechin/g extract) and showed moderate antioxidant capacity. Extractives were present preferentially in the finest fraction with enrichment in the water-soluble portion. The main phenolic constituents found in the bark extract are chlorogenic acid (49.1%), gallic acid (46.8%), o-coumaric acid (2.7%) and trans-cinnamic acid (1.4%). The bark showed high calcium concentration (267 mg/g) and had 103 mg/g nitrogen and 46 mg/g potassium. Based on the potential use of polar extractives, polysaccharides and lignin, bark from A. lecointei is suggested as a valuable resource of raw material for production of high-value products.

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Acknowledgments

Thanks are due to Alana Silva for help with the anatomical analysis. This work was financially supported by Mining company Paragominas S.A. of the Hydro group. This work also is part of the research activities Laboratory of Anatomy of Wood of Universidade Federal de Lavras, a research unit supported by CAPES (Coordenação de Apoio ao Pessoal de Nível Superior, Brazil), FAPEMIG (Fundação de Apoio a Pesquisa do Estado de Minas Gerais, Brazil) and CNPq (Conselho Nacional de Pesquisa Científica, Brazil).

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Correspondence to Graciene S. Mota.

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Mota, G.S., Araujo, E.S., Lorenço, M. et al. Bark of Astronium lecointei Ducke trees from the Amazon: chemical and structural characterization. Eur. J. Wood Prod. 79, 1087–1096 (2021). https://doi.org/10.1007/s00107-021-01670-w

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  • DOI: https://doi.org/10.1007/s00107-021-01670-w

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