Characterisation and valorisation of the bark of Myrcia eximia DC. trees from the Amazon rainforest as a source of phenolic compounds
Author:
Araujo Elesandra da Silva1ORCID, Mota Graciene da Silva2, Lorenço Mário Sérgio1ORCID, Zidanes Uasmim Lira1ORCID, Silva Lucas Rodrigues da1, Silva Eliandra Pereira1, Ferreira Vanuzia Rodrigues Fernandes3, Cardoso Maria das Graças3, Mori Fábio Akira1
Affiliation:
1. Department of Forest Sciences , Federal University of Lavras , PO Box 3037, 372000-900 , Lavras MG , Brazil 2. Department of Biology , Federal University of Lavras , PO Box 3037, 372000-900 , Lavras MG , Brazil 3. Department of Chemistry , Federal University of Lavras , PO Box 3037, 372000-900 , Lavras MG , Brazil
Abstract
Abstract
The bark of the tree species Myrcia eximia DC., which occurs in secondary forests in the Brazilian Amazon, is described for the first time. The aim was to provide a broad knowledge of its composition, to add value, and to direct uses to the bark of this species based on its polyphenolic content and antioxidant capacity. The bark is formed by conducting phloem, nonconducting phloem, and rhytidome. In addition, dead phloem occurs between the periderms. The average chemical composition of the bark was 45.6% total extractives, 1.4% suberin, 1.7% ash, and 21.1% lignin. The ethanol-water extract had a high content of flavonoids and condensed tannins [300.8 and 877.3 mg catechin equivalents (CE) g−1 of the extract, respectively]. High-performance liquid chromatography (HPLC) was used to quantify the presence of rutin, quercetin, and gallic, ferulic, and o-coumaric acids. The bark extract showed strong 2,2-diphenyl-1-picrylhydrazyl hydrate (DPPH) free radical scavenging activity, which was superior to that of the commercial antioxidant butylated hydroxytoluene (BHT), with an IC50 of 85.2 μg mL−1. Based on these results, it is evident that the bark of M. eximia from the Brazilian Amazon rainforest is a new and potential natural source of phenolic compounds and antioxidants, and its extracts can be used in the food and pharmaceutical industry and in various condensed tannin-based products.
Publisher
Walter de Gruyter GmbH
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