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Study of the variability in chemical composition of bark layers of Quercus Suber L. from different production areas

Cork is the bark of the cork oak tree (Quercus suber L), a renewable and biodegradable raw bioresource concentrated mainly in the Mediterranean region. Development of its potential uses as a biosorbent will require the investigation of its chemical composition; such information can be of help to understand its interactions with organic pollutants. The present study investigates the summative chemical composition of three bark layers (back, cork, and belly) of five Spanish cork samples and one cork sample from Portugal. Suberin was the main component in all the samples (21.1 to 53.1%), followed by lignin (14.8 to 31%), holocellulose (2.3 to 33.6%), extractives (7.3 to 20.4%), and ash (0.4 to 3.3%). The Kruskal-Wallis test was used to determine whether the variations in chemical composition with respect to the production area and bark layers were significant. The results indicate that, with respect to the bark layer, significant differences were found only for suberin and holocellulose contents: they were higher in the belly and cork than in the back. Based on the results presented, cork is a material with a lot of potential because of its heterogeneity in chemical composition

© BioResources, 2011, vol. 6, núm. 2, p. 1806-1815

North Carolina State University

Author: Jové, Patricia
Olivella Costa, Àngels
Cano, Laura
Date: 2011
Abstract: Cork is the bark of the cork oak tree (Quercus suber L), a renewable and biodegradable raw bioresource concentrated mainly in the Mediterranean region. Development of its potential uses as a biosorbent will require the investigation of its chemical composition; such information can be of help to understand its interactions with organic pollutants. The present study investigates the summative chemical composition of three bark layers (back, cork, and belly) of five Spanish cork samples and one cork sample from Portugal. Suberin was the main component in all the samples (21.1 to 53.1%), followed by lignin (14.8 to 31%), holocellulose (2.3 to 33.6%), extractives (7.3 to 20.4%), and ash (0.4 to 3.3%). The Kruskal-Wallis test was used to determine whether the variations in chemical composition with respect to the production area and bark layers were significant. The results indicate that, with respect to the bark layer, significant differences were found only for suberin and holocellulose contents: they were higher in the belly and cork than in the back. Based on the results presented, cork is a material with a lot of potential because of its heterogeneity in chemical composition
Format: application/pdf
ISSN: 1930-2126
Document access: http://hdl.handle.net/10256/8407
Language: eng
Publisher: North Carolina State University
Collection: Reproducció digital del document publicat a: http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_06_2_1806_Jove_OC_Variability_Comp_Quercus_Cork/961
Articles publicats (D-Q)
Is part of: © BioResources, 2011, vol. 6, núm. 2, p. 1806-1815
Rights: Tots els drets reservats
Subject: Suro -- Anàlisi
Cork -- Analysis
Title: Study of the variability in chemical composition of bark layers of Quercus Suber L. from different production areas
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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