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Eucalyptus globulus Stumps Bark: Chemical and Anatomical Characterization Under a Valorisation Perspective

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Abstract

The chemical and anatomical properties of Eucalyptus globulus stumps barks collected from fresh stumps (SB) and from industrial stumps bark piles (ISB) were determined. The stump bark showed similar anatomical structure to that of the stem bark, however with abundant prismatic crystals in the axial parenchyma cells. Stumps barks (ISB) presented a great amount of ashes (19.2%) that were incorporated during forest and mill processing, and lower content in extractives (4.1%), lignin (18.5%) and polysaccharides (48.5%). The non-polar (DCM) extracts were composed essentially by triterpenoids, fatty acids (C8 to C28), phytosterols (sterols and steroid ketones) and fatty alcohols (C15 to C28). The polar extracts (ethanol and water) were rich in phenolic compounds, condensed tannins and flavonoids, with higher values for the ethanol extracts and for SB. The antioxidant activity of ethanol extracts from SB was higher although only moderate (IC50 6.8). The lignin monomeric composition (H:G:S) was similar in SB (1:12:45) and in ISB (1:9:26). Sugar-derived compounds formed by Py-GC/MS included more low molecular compounds in ISB than in SB (45.5% vs.20.3%) indicative of a more degraded structure.

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Acknowledgements

The authors acknowledge financial support provided by Fundação para a Ciência e a Tecnologia (FCT) to the Forest Research Centre (UIDB/00239/2020), and to Ana Lourenço through a research contract (DL 57/2016/CP1382/CT0007). The raw material was provided by ALTRI-Celtejo.

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  1. Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de Lisboa, Lisbon, Portugal

    Jorge Gominho, Ricardo A. Costa, Ana Lourenço, Teresa Quilhó & Helena Pereira

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  1. Jorge Gominho
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JG—conceived the study and performed the GC–MS studies. RAC—performed the chemical analysis. AL—performed the Py-GC/MS analysis. TQ—performed the anatomical observations. HP—reviewed the manuscript. All authors contributed to writing the manuscript and approved the final submission.

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Correspondence to Jorge Gominho.

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Gominho, J., Costa, R.A., Lourenço, A. et al. Eucalyptus globulus Stumps Bark: Chemical and Anatomical Characterization Under a Valorisation Perspective. Waste Biomass Valor 12, 1253–1265 (2021). https://doi.org/10.1007/s12649-020-01098-y

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